WO2017100540A2

WO2017100540A2 - Relaxin immunoglobulin fusion proteins and methods of use

Info

Publication number: WO2017100540A2
Application number: PCT/US2016/065779
Authority: WO
Inventors: Feng Wang; Yan Liu; Ying Wang; Guangsen FU; Peter G. Schultz
Original assignee: The California Institute For Biomedical Research
Priority date: 2015-12-09
Filing date: 2016-12-09
Publication date: 2017-06-15
Also published as: EP3387019A2; ES2903257T3; DK3387019T3; PT3387019T; EP4011919A2; US20220048969A1; EP4011919A3; EP3387019A4; US20190263882A1; EP3387019B1; WO2017100540A3; US11161891B2

Abstract

Disclosed herein are relaxin immunoglobulin fusion proteins useful for the treatment or prevention of a disease or condition in a subject.

Description

RELAXIN IMMUNOGLOBULIN FUSION PROTEINS AND METHODS OF USE

CROSS-REFERENCE

[0001] This application claims the benefit of U.S. Provisional Application No. 62/265,344 filed December 9, 2015, which is incorporated by reference herein in its entirety.

BACKGROUND OF THE INVENTION

[0002] Relaxin is expressed mainly in the corpus luteum, in both pregnant and non-pregnant females, rising to a peak within approximately 14 days of ovulation, and then declining in the absence of pregnancy, resulting in menstruation. During the first trimester of pregnancy, levels rise and additional relaxin is produced by the decidua. Relaxin expression peaks during the 14 weeks of the first trimester and at delivery. It is known to mediate the hemodynamic changes that occur during pregnancy, such as increased cardiac output, increased renal blood flow, and increased arterial compliance. It also relaxes other pelvic ligaments and softens the pubic symphysis. In males, relaxin enhances motility of sperm in semen.

[0003] Outside the reproductive system, relaxin affects collagen metabolism, inhibiting collagen synthesis and enhancing its breakdown by increasing matrix metalloproteinases. Relaxin also enhances angiogenesis and is a potent renal vasodilator.

[0004] Relaxin interacts with the relaxin receptor LGR7 (RXFP1) and LGR8 (RXFP2), which belong to the G protein-coupled receptor superfamily. Relaxin receptors have been found in the heart, smooth muscle, the connective tissue, and central and autonomous nervous system.

SUMMARY OF THE INVENTION

[0005] Disclosed herein are relaxin immunoglobulin fusion proteins and methods of using the same for the treatment of various diseases and conditions. The disease or condition may be acute, for example, acute heart failure, acute coronary syndrome with cardiac dysfunction, ischemia reperfusion associated with solid organ transplantation, cardiopulmonary bypass, ischemic stroke, or preeclampsia. The disease or condition may be chronic, for example, diffuse scleroderma, chronic heart failure, diabetic nephropathy, cirrhosis, portal hypertension, atrial fibrillation, cardiac fibrosis, and diabetic wound healing. The methods and compositions may also be used to improve the delivery of a relaxin peptide to target cells, tissues, or tumors.

[0006] In one aspect, provided herein are compositions comprising: (a) relaxin therapeutic peptide comprising a relaxin B chain connected via a peptide linker to a relaxin A chain; and (b) an antibody variable domain comprising SEQ ID NO: 75: SMITX(1)X(2)X(3)FDV, wherein X(l) is selected from F, A, G, and P; X(2) is selected from G, A, S, T, and P; and X(3) is selected from G, A, V, L, and P; and wherein the relaxin therapeutic peptide is connected to the amino-terminus of the antibody variable domain with a connecting peptide. In some embodiments, the antibody variable domain is modified from a heavy chain variable domain of a palivizumab antibody comprising SEQ ID NO: 74, and the composition exhibits reduced binding to RSV-F as compared to the palivizumab antibody. In some embodiments, X(l) is F. In some embodiments, X(l) is A. . In some embodiments, X(l) is G. In some embodiments, X(l) is P. In some embodiments, X(2) is G. In some embodiments, X(2) is A. In some embodiments, X(2) is S. In some embodiments, X(2) is T. In some embodiments, X(2) is P. In some embodiments, X(3) is G. In some embodiments, X(3) is A. In some embodiments, X(3) is V. In some embodiments, X(3) is L. In some embodiments, X(3) is P. In some embodiments, the antibody variable domain further comprises one or more of SEQ ID NOS: 72 and 73. In some embodiments, the composition further comprises an antibody sequence comprising one or more of SEQ ID NOS: 89 or 90. In some embodiments, the composition further comprises an antibody sequence comprising SEQ ID NO: 92 (FQX(4)X(5)GYPFT), wherein X(4) is selected from G, Y, F, W, P, L, V, and A; and X(5) is selected from S, N, G, A, V, L, and P. In some embodiments X(4) is G. In some embodiments X(4) is Y. In some embodiments X(4) is F. In some embodiments X(4) is W. In some embodiments X(4) is P. In some embodiments X(4) is L. In some embodiments X(4) is V. In some embodiments X(4) is A. In some embodiments, X(5) is S. In some embodiments, X(5) is N. In some embodiments, X(5) is G. In some embodiments, X(5) is A. In some embodiments, X(5) is V. In some embodiments, X(5) is L. In some embodiments, X(5) is P. In some embodiments, X(4) is Y and X(5) is S. In some embodiments, X(4) is G and X(5) is N. In some embodiments, the relaxin B chain comprises an amino acid sequence of SEQ ID NO: 46. In some embodiments, the relaxin A chain comprises an amino acid sequence of SEQ ID NO: 47. In some embodiments, the peptide linker comprises at least about 4 consecutive amino acids comprising any combination of G and S amino acids. In some embodiments, the connecting peptide comprises at least about 4 consecutive amino acids comprising any combination of G and S amino acids. In some embodiments, the composition further comprises an Fc region of an antibody and the Fc region comprises one or more mutations to reduce antibody-dependent cellular cytotoxicity. In some embodiments, the Fc region comprises an amino acid sequence at least about 90% identical to SEQ ID NO: 98.

[0007] In one aspect, provided herein are compositions comprising: (a) relaxin therapeutic peptide comprising a relaxin B chain connected via a peptide linker to a relaxin A chain; and (b) an antibody variable domain comprising a modified heavy chain variable domain of a palivizumab antibody comprising SEQ ID NO: 74 having reduced binding to RSV-F as compared to the palivizumab antibody; wherein the relaxin therapeutic peptide is connected to the amino-terminus of the antibody variable domain with a connecting peptide. In some embodiments, the antibody variable domain comprises SEQ ID NO: 75:

SMITX(1)X(2)X(3)FDV, wherein X(l) is selected from F, A, G, and P; X(2) is selected from G, A, S, T, and P; and X(3) is selected from G, A, V, L, and P. In some embodiments, X(l) is F. In some embodiments, X(l) is A. . In some embodiments, X(l) is G. In some embodiments, X(l) is P. In some embodiments, X(2) is G. In some embodiments, X(2) is A. In some

embodiments, X(2) is S. In some embodiments, X(2) is T. In some embodiments, X(2) is P. In some embodiments, X(3) is G. In some embodiments, X(3) is A. In some embodiments, X(3) is V. In some embodiments, X(3) is L. In some embodiments, X(3) is P. In some embodiments, the antibody variable domain further comprises one or more of SEQ ID NOS: 72 and 73. In some embodiments, the composition further comprises an antibody sequence comprising one or more of SEQ ID NOS: 89 or 90. In some embodiments, the composition further comprises an antibody sequence comprising SEQ ID NO: 92 (FQX(4)X(5)GYPFT), wherein X(4) is selected from G, Y, F, W, P, L, V, and A; and X(5) is selected from S, N, G, A, V, L, and P. In some embodiments, X(4) is Y and X(5) is S. In some embodiments X(4) is Y. In some embodiments X(4) is F. In some embodiments X(4) is W. In some embodiments X(4) is P. In some embodiments X(4) is L. In some embodiments X(4) is V. In some embodiments X(4) is A. In some embodiments, X(5) is S. In some embodiments, X(5) is N. In some embodiments, X(5) is G. In some embodiments, X(5) is A. In some embodiments, X(5) is V. In some embodiments, X(5) is L. In some embodiments, X(5) is P. In some embodiments, X(4) is G and X(5) is N. In some embodiments, the relaxin B chain comprises an amino acid sequence of SEQ ID NO: 46. In some embodiments, the relaxin A chain comprises an amino acid sequence of SEQ ID NO: 47. In some embodiments, the peptide linker comprises at least about 4 consecutive amino acids comprising any combination of G and S amino acids. In some embodiments, the connecting peptide comprises at least about 4 consecutive amino acids comprising any combination of G and S amino acids. In some embodiments, the composition further comprises an Fc region of an antibody and the Fc region comprises one or more mutations to reduce antibody-dependent cellular cytotoxicity. In some embodiments, the Fc region comprises an amino acid sequence at least about 90% identical to SEQ ID NO: 98.

[0008] In another aspect, provided herein are methods of treating a disease or condition in an individual in need thereof. In some embodiments, the method comprises administering to the individual a composition comprising a relaxin therapeutic peptide; wherein the composition is intravenously or subcutaneously administered in less than or equal to 6 hours. In some embodiments, the composition is administered in less than or equal to 4, 3, 2 or 1 hours. In some embodiments, the composition is administered during a treatment period of about one day to about 1 week. In some embodiments, the composition is administered about 1, 2, 3, 4, 5, 6 or 7 times. In some embodiments, the disease or condition is selected from acute heart failure, acute coronary syndrome with cardiac dysfunction, ischemia reperfusion associated with solid organ transplantation, cardiopulmonary bypass, ischemic stroke, or preeclampsia. In some embodiments, the disease or condition is solid organ transplantation and the organ is selected from the lung, kidney, liver and heart. In some embodiments, the composition is administered during a treatment period lasting at least about one week. In some embodiments, the

composition is administered twice per week, once per week, four times per month, three times per month, twice per month, once per month, or once per every two months. In some embodiments, the disease or condition is selected from diffuse scleroderma, chronic heart failure, diabetic nephropathy, cirrhosis, portal hypertension, atrial fibrillation, cardiac fibrosis, and diabetic wound healing.

[0009] In another aspect, provided herein are methods of treating a disease or condition in an individual in need thereof. In some embodiments, the method comprises administering to the individual a composition comprising a relaxin therapeutic peptide; wherein the composition is administered to the eye. In some embodiments, the composition is administered in a liquid solution or suspension. In some embodiments, the composition comprises a relaxin therapeutic peptide connected to an amino-terminus of an antibody variable domain via a connecting peptide. In some embodiments, the relaxin polypeptide comprises a relaxin B chain and a relaxin A chain connected by a peptide linker. In some embodiments, the relaxin polypeptide comprises (a) relaxin therapeutic peptide comprising a relaxin B chain connected via a peptide linker to a relaxin A chain; and (b) an antibody variable domain comprising SEQ ID NO: 75: SMITX(1)X(2)X(3)FDV, wherein X(l) is selected from F, A, G, and P; X(2) is selected from G, A, S, T, and P; and X(3) is selected from G, A, V, L, and P; and wherein the relaxin therapeutic peptide is connected to the amino-terminus of the antibody variable domain with a connecting peptide. In some embodiments, the antibody variable domain is modified from a heavy chain variable domain of a palivizumab antibody comprising SEQ ID NO: 74, and the composition exhibits reduced binding to RSV-F as compared to the palivizumab antibody. In some embodiments, X(l) is F. In some embodiments, X(l) is A. . In some embodiments, X(l) is G. In some embodiments, X(l) is P. In some embodiments, X(2) is G. In some embodiments, X(2) is A. In some embodiments, X(2) is S. In some embodiments, X(2) is T. In some

embodiments, X(2) is P. In some embodiments, X(3) is G. In some embodiments, X(3) is A. In some embodiments, X(3) is V. In some embodiments, X(3) is L. In some embodiments, X(3) is P. In some embodiments, X(2) is G. In some embodiments, X(2) is A. In some embodiments, X(2) is G. In some embodiments, the antibody variable domain further comprises one or more of SEQ ID NOS: 72 and 73. In some embodiments, the relaxin polypeptide further comprises an antibody sequence comprising one or more of SEQ ID NOS: 89 or 90. In some embodiments, the relaxin polypeptide further comprises an antibody sequence comprising SEQ ID NO: 92 (FQX(4)X(5)GYPFT), wherein X(4) is selected from G, Y, F, W, P, L, V, and A; and X(5) is selected from S, N, G, A, V, L, and P. In some embodiments X(4) is Y. In some embodiments X(4) is F. In some embodiments X(4) is W. In some embodiments X(4) is P. In some embodiments X(4) is L. In some embodiments X(4) is V. In some embodiments X(4) is A. In some embodiments, X(5) is S. In some embodiments, X(5) is N. In some embodiments, X(5) is G. In some embodiments, X(5) is A. In some embodiments, X(5) is V. In some embodiments, X(5) is L. In some embodiments, X(5) is P. In some embodiments, In some embodiments, X(4) is Y and X(5) is S. In some embodiments, X(4) is G and X(5) is N. In some embodiments, the relaxin B chain comprises an amino acid sequence of SEQ ID NO: 46. In some embodiments, the relaxin A chain comprises an amino acid sequence of SEQ ID NO: 47. In some

embodiments, the peptide linker comprises at least about 4 consecutive amino acids comprising any combination of G and S amino acids. In some embodiments, the connecting peptide comprises at least about 4 consecutive amino acids comprising any combination of G and S amino acids. In some embodiments, the relaxin polypeptide further comprises an Fc region of an antibody and the Fc region comprises one or more mutations to reduce antibody-dependent cellular cytotoxicity. In some embodiments, the Fc region comprises an amino acid sequence at least about 90% identical to SEQ ID NO: 98.

[0010] Further provided herein are methods of treating cardiovascular disease in an individual in need thereof, comprising administering an effective amount of a relaxin immunoglobulin fusion protein described herein to reduce at least one symptom of the cardiovascular disease. In some embodiments, the cardiovascular disease is selected from one or more of the group consisting of acute heart failure, congestive heart failure, compensated heart failure, decompensated heart failure, acute decompensated heart failure, right heart failure, left heart failure, global failure, ischemic cardiomyopathy, dilated cardiomyopathy, heart failure associated with congenital heart defects, heart failure associated with heart valve defects, mitral stenosis, mitral insufficiency, aortic stenosis, aortic insufficiency, tricuspid stenosis, tricuspid insufficiency, pulmonary stenosis, pulmonary valve insufficiency, heart failure associated with combined heart valve defects, myocardial inflammation (myocarditis), chronic myocarditis, acute myocarditis, viral myocarditis, diabetic heart failure, alcoholic cardiomyopathy, heart failure associated with cardiac storage disorders, diastolic heart failure, and systolic heart failure, fibrosis of the heart, thromboembolic disorders, reperfusion damage following ischemia, micro- and macrovascular lesions (vasculitis), arterial and venous thromboses, edemas, ischemias, myocardial infarction, stroke, transient ischemic attack, cardio protection in connection with coronary artery bypass operations, cardio protection in connection with primary percutaneous transluminal coronary angioplasties (PTCAs), PTCAs after thrombolysis, rescue PTCA, heart transplants and open- heart operations, organ protection in connection with transplants, bypass operations, catheter examinations and other surgical procedures, metabolic syndrome, dyslipemia, diastolic dysfunction, familial hypercholesterolemia, isolated systolic hypertension, primary

hypertension, secondary hypertension, left ventricular hypertrophy, arterial stiffness associated with long-term tobacco smoking, arterial stiffness associated with obesity, arterial stiffness associated with age, and hypercholesterolemia. In some embodiments, cardiovascular disease is heart failure. In some embodiments, the symptom is selected from one or more of the group consisting of chest pain, shortness of breath, pain, numbness, weakness, rapid pulse, slow pulse, lightheadedness, dizziness, swelling of the limbs, and fainting.

[0011] Also provided herein are methods of treating fibrosis in an individual in need thereof, comprising administering an effective amount of a relaxin immunoglobulin fusion protein provided herein sufficient to reduce at least one symptom of the fibrosis. In some embodiments, the fibrosis is selected from one or more of the group consisting of pulmonary fibrosis, idiopathic pulmonary fibrosis, cystic fibrosis, cirrhosis, endomyocardial fibrosis, myocardial infarction, atrial fibrosis, mediastinal fibrosis, myelofibrosis, retroperitoneal fibrosis, progressive massive fibrosis, nephrogenic systemic fibrosis, Crohn's disease, keloid, scleroderma/systemic sclerosis, arthrofibrosis, Peyronie's disease, Dupuytren's contracture, and adhesive capsulitis. Also provided herein are methods of treating acute heart failure, acute coronary syndrome with cardiac dysfunction, ischemia reperfusion associated with solid organ transplantation, cardiopulmonary bypass, ischemic stroke, preeclampsia, diffuse scleroderma, chronic heart failure, diabetic nephropathy, cirrhosis, portal hypertension, atrial fibrillation, cardiac fibrosis, diabetic wound healing, or a combination thereof, comprising administering an effective amount of a relaxin immunoglobulin fusion protein provided herein.

[0012] Also provided herein, are genetic constructs comprising a polynucleotide encoding a relaxin immunoglobulin fusion protein provided herein. Further provided herein are expression vector comprising the genetic constructs disclosed herein. Further provided herein are mammalian expression hosts comprising the expression vectors disclosed herein. Further provided herein are methods of producing a relaxin immunoglobulin fusion protein comprising: transfecting the expression vector of claim 45 into a mammalian cell culture; growing the cell culture in an expression medium at a controlled temperature and percentage C02; and harvesting the secreted immunoglobulin fusion protein. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The foregoing summary, as well as the following detailed description of the disclosure, will be better understood when read in conjunction with the appended figures. It should be understood, however, that the disclosure is not limited to the precise examples shown. It is emphasized that, according to common practice, the various features of the drawings are not to- scale. On the contrary, the dimensions of the various features are arbitrarily expanded or reduced for clarity. Included in the drawings are the following figures.

[0014] FIG. 1A, FIG. IB, and FIG. 1C show SDS-PAGE gels of purified palivizumab-relaxin fusion proteins.

[0015] FIG. 2A, FIG. 2B, and FIG. 2C depict graphs of the activities of palivizumab-relaxin fusion proteins.

[0016] FIG. 3A and FIG. 3B depict graphs of palivizumab-relaxin fusion protein/RSV-epitope binding assay.

[0017] FIG. 4 shows binding of palivizumab-relaxin fusion proteins to RSV.

[0018] FIG. 5A, FIG. 5B, FIG. 5C, FIG. 5D, FIG. 5E, and FIG. 5F show SDS-PAGE gels of purified palivizumab-relaxin fusion proteins.

[0019] FIG. 6A, FIG. 6B, FIG. 6C, FIG. 6D, FIG. 6E, and FIG. 6F show graphs of the activities of palivizumab-relaxin fusion proteins.

[0020] FIG. 7A and FIG. 7B show graphs of the activities of palivizumab-relaxin fusion proteins.

[0021] FIG. 8A and FIG. 8B show protein characterization of palivizumab-relaxin fusion protein RLX303.

[0022] FIG. 9A, FIG. 9B, and FIG. 9C show serum stability of relaxin-2 peptide and palivizumab-relaxin fusion proteins RLX302 and RLX303.

[0023] FIG. 10 shows mouse pharmacokinetic analysis of palivizumab-relaxin fusion proteins.

[0024] FIG. 11A and FIG. 11B show rat pharmacokinetic analysis of palivizumab-relaxin fusion proteins.

[0025] FIG. 12A and FIG. 12B show pharmacodynamics analysis of palivizumab-relaxin fusion proteins.

DETAILED DESCRIPTION OF THE INVENTION

[0026] Relaxin amino-terminal palivizumab fusions with reduced binding to respiratory syncytial virus (RSV) proteins which have a relaxin peptide fused to the amino-terminus of a palivizumab heavy chain polypeptide are useful in treating diseases responsive to relaxin peptide. Reducing binding to RSV proteins is achieved by mutating amino acid residues in the CDR portions of the palivizumab amino acid sequence. Further therapeutic value is obtained by reducing ADCC elicited by the palivizumab by mutating amino acid residues in the Fc portion of the palivizumab amino acid sequence.

[0027] Disclosed herein are amino-terminal immunoglobulin fusion proteins comprising a relaxin peptide, and methods of use for the treatment of a disease or condition responsive to a relaxin peptide. According to one feature of the subject matter described herein, an amino- terminal immunoglobulin fusion protein comprises (a) a first immunoglobulin region; and (b) a relaxin peptide connected to the amino terminus of the first immunoglobulin region with a connecting peptide. The first immunoglobulin region may be part of an immunoglobulin heavy chain, and the immunoglobulin fusion protein further comprises a second immunoglobulin region of an immunoglobulin light chain. As used herein, an immunoglobulin region may include a variable domain such that the relaxin peptide is connected to the amino-terminus of a variable domain of the immunoglobulin region. The first and/or second immunoglobulin region may comprise part of an antibody variable domain that does not form a binding site specific for a human antigen. In some cases, the antibody variable domain is a palivizumab variable domain, or a variable domain modified from a palivizumab variable domain. The variable domain may be modified from palivizumab to attenuate or eliminate RSV binding.

[0028] Exemplary amino-terminal immunoglobulin fusion proteins are depicted in Formulas I- XXXII, wherein T is a therapeutic peptide or a portion of a therapeutic peptide, C is a connecting peptide, A is an immunoglobulin region, P is a protease site, L is a linker, and I is an internal linker. The therapeutic peptide may be a relaxin peptide comprising one or a combination of relaxin B chain, relaxin A chain, and C-peptide or linker peptide.

[0029] Further disclosed herein are methods of treating a disease or condition in a subject in need thereof. Generally, the method comprises administering to the subject an amino-terminal immunoglobulin fusion protein comprising a therapeutic peptide such as a relaxin peptide attached to the amino terminus of an immunoglobulin region. In some embodiments, an immunoglobulin fusion protein having the formula of I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII, XIII, XIV, XV, XVI, XVII, XVIII, XIX, XX, XXI, XXII, XXIII, XXIV, XXV, XXVI, XXVII, XXVIII, XXIX, XXX, XXXI, XXXII, or any modification, portions, or additions thereof is administered to a patient. In some embodiments, one or more of the immunoglobulin fusion proteins I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII, XIII, XIV, XV, XVI, XVII, XVIII, XIX, XX, XXI, XXII, XXIII, XXIV, XXV, XXVI, XXVII, XXVIII, XXIX, XXX, XXXI, or XXXII, further comprising a second immunoglobulin region, is administered to a patient.

[0030] Further disclosed herein are methods of improving the delivery of a therapeutic peptide. The methods may involve generation of an amino-terminal immunoglobulin fusion protein from a genetic construct. In some embodiments, the immunoglobulin fusion protein is recombinantly produced from a genetic construct encoding the immunoglobulin fusion protein. In some embodiments, the construct is expressed in vitro using standard mammalian cell culture techniques. In some embodiments, one construct encoding a therapeutic peptide connected to the amino-terminus of a first immunoglobulin region is co-expressed with a second construct comprising a second immunoglobulin region, to produce a recombinant immunoglobulin fusion protein. In some embodiments, a construct encoding a protease is co-expressed with an immunoglobulin fusion protein. The method may further comprise generating immunoglobulin genetic fusion constructs comprising one or more connecting peptides, internal linkers, linkers, and/or proteolytic cleavage sites. [0031] Before the present methods and compositions are described, it is to be understood that this disclosure is not limited to a particular method or composition described, and as such may vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting. Examples are put forth so as to provide those of ordinary skill in the art with a disclosure and description of how to make and use the immunoglobulin fusion proteins provided herein, and are not intended to limit the scope of what the inventors regard as their invention nor are they intended to represent that the provided experiments encompass all of the experiments performed. Efforts have been made to ensure accuracy with respect to numbers used but some experimental errors and deviations should be accounted for.

[0032] Where a range of values is provided, it is understood that each intervening value, to the tenth of the unit of the lower limit unless the context clearly dictates otherwise, between the upper and lower limits of that range is also specifically disclosed. Each smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in that stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range, and each range where either, neither or both limits are included in the smaller ranges is also encompassed within the invention, subject to any specifically excluded limit in the stated range. Where the stated range includes one or both of the limits, ranges excluding either or both of those included limits are also included in the invention.

[0033] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. All publications mentioned herein are incorporated herein by reference to disclose and describe the methods and/or materials in connection with which the publications are cited. It is understood that the present disclosure supersedes any disclosure of an incorporated publication to the extent there is a contradiction.

[0034] As will be apparent to those of skill in the art upon reading this disclosure, each of the individual embodiments described and illustrated herein has discrete components and features which may be readily separated from or combined with the features of any of the other several embodiments without departing from the scope or spirit of the present invention. Any recited method can be carried out in the order of events recited or in any other order which is logically possible. Any recited combination of amino acid sequences can have the order recited, or any other order which is logically possible. As a non-limiting example, an immunoglobulin fusion protein comprising an insulin therapeutic peptide, T, and an immunoglobulin region, A, includes, for example and without limitation: T-A, A-T, T-A-T, and A-T-A. [0035] It must be noted that as used herein and in the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a cell" includes a plurality of such cells and reference to "the peptide" includes reference to one or more peptides and equivalents thereof, e.g. polypeptides, known to those skilled in the art, and so forth.

[0036] The terms "homologous," "homology," or "percent homology" when used herein to describe to an amino acid sequence or a nucleic acid sequence, relative to a reference sequence, can be determined using the formula described by Karlin and Altschul (Proc. Natl. Acad. Sci. USA 87: 2264-2268, 1990, modified as in Proc. Natl. Acad. Sci. USA 90:5873-5877, 1993). Such a formula is incorporated into the basic local alignment search tool (BLAST) programs of Altschul et al. (J. Mol. Biol. 215: 403-410, 1990). Percent homology of sequences can be determined using the most recent version of BLAST, as of the filing date of this application.

Relaxin Immunoglobulin Fusion Proteins

[0037] Various insulin immunoglobulin fusion proteins disclosed herein comprise a first immunoglobulin region and a relaxin therapeutic peptide, wherein the relaxin therapeutic peptide, or an amino acid sequence thereof, is connected to an amino terminus of the first immunoglobulin region. In various instances, the insulin immunoglobulin fusion proteins further comprise a second immunoglobulin region. The immunoglobulin region (first and/or second) may be any portion, in part or whole, of an immunoglobulin.

[0038] The immunoglobulin region may comprise an entire immunoglobulin molecule or any polypeptide comprising a fragment of an immunoglobulin including, but not limited to, heavy chain, light chain, variable domain, constant domain, complementarity determining region (CDR), framework region, fragment antigen binding (Fab) region, Fab', F(ab')2, F(ab')3, Fab', fragment crystallizable (Fc) region, single chain variable fragment (scFV), di-scFv, single domain immunoglobulin, trifunctional immunoglobulin, chemically linked F(ab')2, and any portion or combination thereof. In some embodiments, an immunoglobulin heavy chain may comprise an entire heavy chain or a portion of a heavy chain. For example, a variable domain or region thereof derived from a heavy chain may be referred to as a heavy chain or a region of a heavy chain. In some embodiments, an immunoglobulin light chain may comprise an entire light chain or a portion of a light chain. For example, a variable domain or region thereof derived from a light chain may be referred to as a light chain or a region of a light chain. The immunoglobulin region may be bispecific or trispecific. A single domain immunoglobulin includes, but is not limited to, a single monomeric variable immunoglobulin domain. The single domain immunoglobulin may be a shark variable new antigen receptor immunoglobulin fragment (VNAR). The immunoglobulin may be derived from any type known to one of skill in the art including, but not limited to, IgA, IgD, IgE, IgG, IgM, IgY, IgW. The immunoglobulin region may be a glycoprotein. The immunoglobulin region may comprise one or more functional units, including but not limited to, 1, 2, 3, 4, and 5 units. The immunoglobulin region may comprise one or more units connected by one or more disulfide bonds. The

immunoglobulin region may comprise one or more units connected by a peptide linker, for example, a scFv immunoglobulin. The immunoglobulin may be a recombinant immunoglobulin including immunoglobulins with amino acid mutations, substitutions, and/or deletions. The immunoglobulin may be a recombinant immunoglobulin comprising chemical modifications. The immunoglobulin may comprise a whole or part of an immunoglobulin-drug conjugate. The immunoglobulin may comprise a small molecule. The immunoglobulin may comprise a whole or part of an immunoglobulin-drug conjugate comprising a small molecule. The

immunoglobulin may be from a mammalian source. The immunoglobulin may be a chimeric immunoglobulin. The immunoglobulin region may be derived in whole or in part from an engineered immunoglobulin or recombinant immunoglobulin. The immunoglobulin may be from a humanized, human engineered or fully human immunoglobulin. The mammalian immunoglobulin may be a bovine immunoglobulin. The mammalian immunoglobulin may be a human immunoglobulin. The mammalian immunoglobulin may be a murine immunoglobulin. The mammalian immunoglobulin may be a non-human primate immunoglobulin. The immunoglobulin may be an avian immunoglobulin. The immunoglobulin may be a shark immunoglobulin.

[0039] The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is based on or derived from any one of SEQ ID NOs: 13-16, 20-22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 50% homologous to any one of SEQ ID NOs: 13-16, 20-22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to any one of SEQ ID NOs: 13-16, 20-22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 70% homologous to any one of SEQ ID NOs: 13-16, 20-22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 80% homologous to any one of SEQ ID NOs: 13-16, 20-22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 50% identical to any one of SEQ ID NOs: 13-16, 20-22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to any one of SEQ ID NOs: 13-16, 20-22. The

immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 70% identical to any one of SEQ ID NOs: 13-16, 20-22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 80% identical to any one of SEQ ID NOs: 13-16, 20-22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is 100% identical to any one of SEQ ID NOs: 13-16, 20-22. The

immunoglobulin light chain may comprise an amino acid sequence that is based on or derived from any one of SEQ ID NOs: 9-12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 50% homologous to any one of SEQ ID NOs: 9-12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to any one of SEQ ID NOs: 9-12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 70%) homologous to any one of SEQ ID NOs: 9-12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 80% homologous to any one of SEQ ID NOs: 9-12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 50% identical to any one of SEQ ID NOs: 9-12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to any one of SEQ ID NOs: 9-12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 70% identical to any one of SEQ ID NOs: 9-12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 80% identical to any one of SEQ ID NOs: 9-12. The immunoglobulin light chain may comprise an amino acid sequence that is 100% identical to any one of SEQ ID NOs: 9-12.

[0040] The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is based on or derived from SEQ ID NO: 22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 50% homologous to SEQ ID NO: 22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to SEQ ID NO: 22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 70%) homologous to SEQ ID NO: 22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 80% homologous to SEQ ID NO: 22. The

immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 50%) identical to SEQ ID NO: 22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to SEQ ID NO: 22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 70% identical to SEQ ID NO: 22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is at least about 80% identical to SEQ ID NO: 22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence that is 100% identical to SEQ ID NO: 22. The immunoglobulin light chain may comprise an amino acid sequence that is based on or derived from SEQ ID NO: 12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 50% homologous to SEQ ID NO: 12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97%

homologous to SEQ ID NO: 12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 70% homologous to SEQ ID NO: 12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 80% homologous to SEQ ID NO: 12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 50% identical to SEQ ID NO: 12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to SEQ ID NO: 12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 70% identical to SEQ ID NO: 12. The immunoglobulin light chain may comprise an amino acid sequence that is at least about 80% identical to SEQ ID NO: 12. The immunoglobulin light chain may comprise an amino acid sequence that is 100% identical to SEQ ID NO: 12.

[0041] The immunoglobulin heavy chain fusion may comprise an amino acid sequence comprising 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 or more amino acids based on or derived from any one of SEQ ID NOs: 13-16, 20-22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence comprising 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 450, 500 or more amino acids based on or derived from any one of SEQ ID NOs: 13-16, 20-22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence comprising 10 or more amino acids based on or derived from any one of SEQ ID NOs: 13-16, 20-22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence comprising 50 or more amino acids based on or derived from any one of SEQ ID NOs: 13-16, 20-22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence comprising 100 or more amino acids based on or derived from any one of SEQ ID NOs: 13-16, 20-22. The immunoglobulin heavy chain fusion may comprise an amino acid sequence comprising 200 or more amino acids based on or derived from any one of SEQ ID NOs: 13-16, 20-22. The amino acids may be consecutive. Alternatively, or additionally, the amino acids are nonconsecutive. In some embodiments, the immunoglobulin heavy chain fusion may comprise amino acids derived from any one of SEQ ID NOs: 13-16, 20-22 and amino acids not derived from any one of SEQ ID NOs: 13-16, 20-22. In some embodiments, the immunoglobulin heavy chain fusion may comprise amino acids derived from one or more of SEQ ID NOs: 13-16, 20-22 and amino acids not derived from any one of SEQ ID NOs: 13-16, 20-22. In some embodiments, the immunoglobulin heavy chain fusion comprises amino acids derived from 1, 2, 3, 4, or 5 of SEQ ID NOs: 13-16, 20-22.

[0042] The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence that is based on or derived from any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence that is at least about 50% homologous to any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence that is at least about 70% homologous to any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence that is at least about 80% homologous to any one of SEQ ID NOs: 5-8, 17- 19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence that is at least about 50% identical to any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence that is at least about 70%) identical to any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence that is at least about 80% identical to any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence that is 100% identical to any one of SEQ ID NOs: 5-8, 17-19.

[0043] The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence comprising 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 or more nucleotides based on or derived from any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence comprising 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 450, 500 or more nucleotides based on or derived from any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence comprising 600, 650, 700, 750, 800, 850, 900, 950, 1000 or more nucleotides based on or derived from any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence comprising 1100, 1200, 1300, 1400, 1500 or more nucleotides based on or derived from any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence comprising 100 or more nucleotides based on or derived from any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence comprising 500 or more nucleotides based on or derived from any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence comprising 1000 or more nucleotides based on or derived from any one of SEQ ID NOs: 5-8, 17-19. The immunoglobulin heavy chain fusion may be encoded by a nucleotide sequence comprising 1300 or more nucleotides based on or derived from any one of SEQ ID NOs: 5-8, 17-19. The nucleotides may be consecutive. Alternatively, or additionally, the nucleotides are nonconsecutive. In some embodiments, the immunoglobulin heavy chain fusion is encoded by a nucleotide sequence comprising nucleotides derived from any one of SEQ ID NOs: 5-8, 17-19 and nucleotides not derived from any one of SEQ ID NOs: 5-8, 17-19. In some embodiments, the immunoglobulin heavy chain fusion is encoded by a nucleotide sequence comprising nucleotides derived from one or more of SEQ ID NOs: 5-8, 17-19 and nucleotides not derived from any one of SEQ ID NOs: 5-8, 17-19. In some embodiments, the immunoglobulin heavy chain fusion is encoded by a nucleotide sequence derived from 1, 2, 3, 4, or 5 of SEQ ID NOs: 5-8, 17-19.

Immunoglobulin fusion proteins

[0044] In one feature of the invention, provided herein are immunoglobulin fusion proteins comprising (a) an immunoglobulin light chain fusion, and (b) a second immunoglobulin region derived from an immunoglobulin heavy chain, wherein the immunoglobulin light chain fusion is connected to the second immunoglobulin region by one or more disulfide bonds or a connecting peptide. The immunoglobulin light chain fusion comprises a first therapeutic peptide connected to the amino-terminus of a first immunoglobulin region derived from an immunoglobulin light chain. In some embodiments, the second immunoglobulin region is attached to a non- immunoglobulin region, creating a second immunoglobulin fusion. The non-immunoglobulin region may comprise a second therapeutic peptide. The non-immunoglobulin region may comprise a linker peptide. The non-immunoglobulin region may comprise a proteolytic cleavage site. The second therapeutic peptide may comprise an internal linker. In some embodiments, the second therapeutic peptide is attached to the amino- or carboxyl- terminus of the second immunoglobulin region. In some embodiments, the second therapeutic peptide is attached to one or more internal amino acids of the second immunoglobulin region. In some embodiments, the second therapeutic peptide is attached to amino acids of a loop portion within the second immunoglobulin region. In some embodiments, the therapeutic peptide is attached to the second immunoglobulin region using one or more linker peptides. The immunoglobulin light chain fusion may further comprise one or more additional therapeutic peptides.

[0045] In one feature of the invention, provided herein are immunoglobulin fusion proteins comprising (a) an immunoglobulin heavy chain fusion, and (b) a second immunoglobulin region derived from an immunoglobulin light chain, wherein the immunoglobulin heavy chain fusion is connected to the second immunoglobulin region by one or more disulfide bonds or a connecting peptide. The immunoglobulin heavy chain fusion comprises a first therapeutic peptide connected to the amino-terminus of a first immunoglobulin region derived from an

immunoglobulin heavy chain. In some embodiments, the second immunoglobulin region is attached to a non-immunoglobulin region, creating a second immunoglobulin fusion. The non- immunoglobulin region may comprise a second therapeutic peptide. The non-immunoglobulin region may comprise a linker peptide. The non-immunoglobulin region may comprise a proteolytic cleavage site. The second therapeutic peptide may comprise an internal linker. In some embodiments, the second therapeutic peptide is attached to the amino- or carboxyl- terminus of the second immunoglobulin region. In some embodiments, the second therapeutic peptide is attached to one or more internal amino acids of the second immunoglobulin region. In some embodiments, the second therapeutic peptide is attached to amino acids of a loop portion within the second immunoglobulin region. In some embodiments, the therapeutic peptide is attached to the second immunoglobulin region using one or more linker peptides. The immunoglobulin heavy chain fusion may further comprise one or more additional therapeutic peptides.

[0046] In one feature of the invention, provided herein are immunoglobulin fusion proteins comprising (a) an immunoglobulin light chain fusion, and (b) an immunoglobulin heavy chain fusion. The immunoglobulin light chain fusion comprises a first therapeutic peptide connected to the amino-terminus of a first immunoglobulin region derived from an immunoglobulin light chain. The immunoglobulin heavy chain fusion comprises a first therapeutic peptide connected to the amino-terminus of a first immunoglobulin region derived from an immunoglobulin heavy chain. In some embodiments, the immunoglobulin light chain fusion further comprises one or more additional therapeutic peptides. In some embodiments, the immunoglobulin heavy chain fusion comprises one or more additional therapeutic peptides.

[0047] In one feature of the invention, provided herein are immunoglobulin fusion proteins comprising (a) an immunoglobulin light chain fusion, and (b) a second immunoglobulin region, wherein the immunoglobulin light chain fusion comprises a first therapeutic peptide connected to the amino-terminus of a first immunoglobulin region derived from an immunoglobulin light chain. The second immunoglobulin region may be derived from an immunoglobulin heavy chain. The second immunoglobulin region may be derived from an immunoglobulin light chain. The second immunoglobulin region may be connected to one or more non-immunoglobulin regions, creating a second immunoglobulin fusion. The non-immunoglobulin region may comprise a second therapeutic peptide. The non-immunoglobulin region may comprise a linker peptide. The non-immunoglobulin region may comprise a proteolytic cleavage site. The second therapeutic peptide may comprise an internal linker. In some embodiments, the second therapeutic peptide is attached to the amino- or carboxyl- terminus of the second immunoglobulin region. In some embodiments, the second therapeutic peptide is attached to one or more internal amino acids of the second immunoglobulin region. In some embodiments, the second therapeutic peptide is attached to amino acids of a loop portion within the second immunoglobulin region. In some embodiments, the therapeutic peptide is attached to the second immunoglobulin region using one or more linker peptides. The immunoglobulin light chain fusion may further comprise one or more additional therapeutic peptides.

[0048] In one feature of the invention, provided herein are immunoglobulin fusion proteins comprising (a) an immunoglobulin heavy chain fusion, and (b) a second immunoglobulin region, wherein the immunoglobulin heavy chain fusion comprises a first therapeutic peptide connected to the amino-terminus of a first immunoglobulin region derived from an

immunoglobulin heavy chain. The second immunoglobulin region may be derived from an immunoglobulin heavy chain. The second immunoglobulin region may be derived from an immunoglobulin light chain. The second immunoglobulin region may be connected to one or more non-immunoglobulin regions, creating a second immunoglobulin fusion. The non- immunoglobulin region may comprise a second therapeutic peptide. The non-immunoglobulin region may comprise a linker peptide. The non-immunoglobulin region may comprise a proteolytic cleavage site. The second therapeutic peptide may comprise an internal linker. In some embodiments, the second therapeutic peptide is attached to the amino- or carboxyl- terminus of the second immunoglobulin region. In some embodiments, the second therapeutic peptide is attached to one or more internal amino acids of the second immunoglobulin region. In some embodiments, the second therapeutic peptide is attached to amino acids of a loop portion within the second immunoglobulin region. In some embodiments, the therapeutic peptide is attached to the second immunoglobulin region using one or more linker peptides. The immunoglobulin heavy chain fusion may further comprise one or more additional therapeutic peptides.

[0049] In one feature of the invention, provided herein is an immunoglobulin fusion protein comprising a relaxin therapeutic peptide connected to the amino-terminus of a region of an immunoglobulin heavy chain, wherein the immunoglobulin fusion is referred to herein as an immunoglobulin heavy chain fusion. In some embodiments, the immunoglobulin fusion protein further comprises one or more regions of an immunoglobulin light chain, wherein the immunoglobulin heavy chain fusion is connected to the one or more regions of an

immunoglobulin light chain by disulfide bonds or a connecting peptide. In some embodiments, the therapeutic peptide comprises a relaxin B chain and a relaxin A chain. The relaxin B and relaxin A chains may be connected by a peptide linker. The peptide linker may comprise a protease cleavage site.

[0050] The immunoglobulin fusion protein may comprise an amino acid sequence that is based on or derived from any one of SEQ ID NOs: 20-22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 50% homologous to any one of SEQ ID NOs: 20-22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to any one of SEQ ID NOs 20-22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 70% homologous to any one of SEQ ID NOs: 20-22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 80% homologous to any one of SEQ ID NOs: 20-22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 50% identical to any one of SEQ ID NOs: 20-22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to any one of SEQ ID NOs 20-22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 70% identical to any one of SEQ ID NOs: 20-22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 80% identical to any one of SEQ ID NOs: 20-22. The immunoglobulin fusion protein may comprise an amino acid sequence that is 100% identical to any one of SEQ ID NOs: 20-22. In some embodiments, the immunoglobulin fusion protein comprises an amino acid sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%), 80%), 85%), 90%), 95%, or 97% homologous to an amino acid sequence of any one of SEQ ID NOs: 20-22. In some embodiments, the immunoglobulin fusion protein comprises an amino acid sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97%) identical to an amino acid sequence of any one of SEQ ID NOs: 20-22.

[0051] The immunoglobulin fusion protein may comprise an amino acid sequence that is based on or derived from SEQ ID NO: 22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 50% homologous to SEQ ID NO: 22. The

immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to SEQ ID NO: 22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 70% homologous to SEQ ID NO: 22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 80% homologous to SEQ ID NO: 22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 50% identical to SEQ ID NO: 22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to SEQ ID NO: 22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 70% identical to SEQ ID NO: 22. The immunoglobulin fusion protein may comprise an amino acid sequence that is at least about 80% identical to SEQ ID NO: 22. The immunoglobulin fusion protein may comprise an amino acid sequence that is 100% identical to SEQ ID NO: 22. In some embodiments, the immunoglobulin fusion protein comprises an amino acid sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to an amino acid sequence of SEQ ID NO: 22. In some embodiments, the immunoglobulin fusion protein comprises an amino acid sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to an amino acid sequence of SEQ ID NO: 22.

[0052] The immunoglobulin fusion protein may comprise an amino acid sequence comprising 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 or more amino acids based on or derived from any one of SEQ ID NOs: 20-22. The immunoglobulin fusion protein may comprise an amino acid sequence comprising 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 450, 500 or more amino acids based on or derived from any one of SEQ ID NOs: 20-22. The

immunoglobulin fusion protein may comprise an amino acid sequence comprising 10 or more amino acids based on or derived from any one of SEQ ID NOs: 20-22. The immunoglobulin fusion protein may comprise an amino acid sequence comprising 50 or more amino acids based on or derived from any one of SEQ ID NOs: 20-22. The immunoglobulin fusion protein may comprise an amino acid sequence comprising 100 or more amino acids based on or derived from any one of SEQ ID NOs: 20-22. The immunoglobulin fusion protein may comprise an amino acid sequence comprising 200 or more amino acids based on or derived from any one of SEQ ID NOs: 20-22. The amino acids may be consecutive. Alternatively, or additionally, the amino acids are nonconsecutive. In some embodiments, the immunoglobulin fusion protein may comprise amino acids derived from any one of SEQ ID NOs: 20-22 and amino acids not derived from any one of SEQ ID NOs: 20-22. In some embodiments, the immunoglobulin fusion protein may comprise amino acids derived from one or more of SEQ ID NOs: 20-22 and amino acids not derived from any one of SEQ ID NOs: 20-22. In some embodiments, the

immunoglobulin fusion protein comprises amino acids derived from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more of SEQ ID NOs: 20-22.

[0053] The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is based on or derived from any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 50% homologous to any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 70% homologous to any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 80% homologous to any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 50% identical to any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 70% identical to any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 80% identical to any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is 100% identical to any one of SEQ ID NOs: 17-19. In some embodiments, the immunoglobulin fusion protein is encoded by a nucleotide sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%), or 97% homologous to an amino acid sequence of any one of SEQ ID NOs: 17-19. In some embodiments, the immunoglobulin fusion protein is encoded by a nucleotide sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to an amino acid sequence of any one of SEQ ID NOs: 17-19.

[0054] The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is based on or derived from SEQ ID NO: 19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 50% homologous to SEQ ID NO: 19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to SEQ ID NO: 19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 70%) homologous to SEQ ID NO: 19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 80% homologous to SEQ ID NO: 19. The

immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 50%) identical to SEQ ID NO: 19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to SEQ ID NO: 19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 70% identical to SEQ ID NO: 19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is at least about 80% identical to SEQ ID NO: 19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence that is 100%) identical to SEQ ID NO: 19. In some embodiments, the immunoglobulin fusion protein is encoded by a nucleotide sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to SEQ ID NO: 19. In some embodiments, the immunoglobulin fusion protein is encoded by a nucleotide sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to SEQ ID NO: 19.

[0055] The immunoglobulin fusion protein may be encoded by a nucleotide sequence comprising 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 or more nucleotides based on or derived from any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence comprising 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 450, 500 or more nucleotides based on or derived from any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence comprising 600, 650, 700, 750, 800, 850, 900, 950, 1000 or more nucleotides based on or derived from any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence comprising 1100, 1200, 1300, 1400, 1500 or more nucleotides based on or derived from any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence comprising 100 or more nucleotides based on or derived from any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence comprising 500 or more nucleotides based on or derived from any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence comprising 1,000 or more nucleotides based on or derived from any one of SEQ ID NOs: 17-19. The immunoglobulin fusion protein may be encoded by a nucleotide sequence comprising 1,300 or more nucleotides based on or derived from any one of SEQ ID NOs: 17-19. The nucleotides may be consecutive. Alternatively, or additionally, the nucleotides are nonconsecutive. In some embodiments, the immunoglobulin fusion protein is encoded by a nucleotide sequence comprising nucleotides derived from any one of SEQ ID NOs: 17-19 and nucleotides not derived from any one of SEQ ID NOs: 17-19. In some embodiments, the immunoglobulin fusion protein is encoded by a nucleotide sequence comprising nucleotides derived from one or more of SEQ ID NOs: 25-44 and nucleotides not derived from any one of SEQ ID NOs: 17-19. In some embodiments, the immunoglobulin fusion protein is encoded by a nucleotide sequence derived from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more of SEQ ID NOs: 17-19.

[0056] Further disclosed herein are nucleotide constructs comprising a nucleotide sequence that is based on or derived from any one of SEQ ID NOs: 17-19. The nucleotide construct may be a plasmid for expression in a host cell. For example, a mammalian or bacterial expression plasmid. In some embodiments, the construct comprises a nucleotide sequence that is at least about 50% homologous to any one of SEQ ID NOs: 17-19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%), or 97%) homologous to any one of SEQ ID NOs: 17-19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 70% homologous to any one of SEQ ID NOs: 17-19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 80% homologous to any one of SEQ ID NOs: 17-19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 50% identical to any one of SEQ ID NOs: 17-19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to any one of SEQ ID NOs: 17-19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 70%) identical to any one of SEQ ID NOs: 17-19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 80% identical to any one of SEQ ID NOs: 17-19. In some embodiments, the construct comprises a nucleotide sequence that is 100% identical to any one of SEQ ID NOs: 17-19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%), or 97%) homologous to an amino acid sequence of any one of SEQ ID NOs: 17-19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to an amino acid sequence of any one of SEQ ID NOs: 17-19.

[0057] Further disclosed herein are nucleotide constructs comprising a nucleotide sequence that is based on or derived from SEQ ID NO: 19. The nucleotide construct may be a plasmid for expression in a host cell. For example, a mammalian or bacterial expression plasmid. In some embodiments, the construct comprises a nucleotide sequence that is at least about 50% homologous to SEQ ID NO: 19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97%

homologous to SEQ ID NO: 19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 70% homologous to SEQ ID NO: 19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 80% homologous to SEQ ID NO: 19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 50%) identical to a SEQ ID NO: 19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to SEQ ID NO: 19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 70% identical to SEQ ID NO: 19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 80% identical to SEQ ID NO: 19. In some embodiments, the construct comprises a nucleotide sequence that is 100% identical to SEQ ID NO: 19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to SEQ ID NO: 19. In some embodiments, the construct comprises a nucleotide sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to SEQ ID NO: 19.

[0058] The immunoglobulin fusion protein may comprise an immunoglobulin heavy chain fusion that is based on or derived from any one or more of SEQ ID NOs: 20-22.

[0059] The immunoglobulin fusion protein may comprise an immunoglobulin heavy chain fusion that is based on or derived from SEQ ID NO: 22.

[0060] The immunoglobulin fusion protein may comprise a second immunoglobulin region derived from an immunoglobulin heavy chain including any one or more of SEQ ID NOs: 20- 22.

[0061] The immunoglobulin fusion protein may comprise an immunoglobulin light chain fusion that is based on or derived from any one or more of SEQ ID NOs: 9-12.

[0062] The immunoglobulin fusion protein may comprise an immunoglobulin light chain fusion that is based on or derived from SEQ ID NO: 12.

[0063] The immunoglobulin fusion protein may comprise a second immunoglobulin region derived from an immunoglobulin light chain including any one or more of SEQ ID NOs: 9-12.

[0064] The immunoglobulin fusion protein may comprise (a) a region of an immunoglobulin heavy chain that is based on or derived from any one or more of SEQ ID NOs: 20-22; and (b) a region of an immunoglobulin light chain that is based on or derived from any one or more of SEQ ID NOs: 9-12. The immunoglobulin fusion protein may comprise (a) a region of an immunoglobulin heavy chain comprising an amino acid sequence that is at least about 50% identical to SEQ ID NOs 20-22; and (b) a region of an immunoglobulin light chain comprising an amino acid sequence that is at least about 50% identical to SEQ ID NOs: 9-12. The region of an immunoglobulin heavy chain may comprise an amino acid sequence that is at least about 60%, 70%, 75%, 80%, 90%, 95%, or 97% identical to SEQ ID NOs: 20-22. The region of an immunoglobulin heavy chain may comprise an amino acid sequence that is 100% identical to SEQ ID NOs: 20-22. The region of an immunoglobulin light chain may comprise an amino acid sequence that is at least about 60%, 70%, 75%, 80%, 90%, 95%, or 97% identical to SEQ ID NOs: 9-12. The region of an immunoglobulin light chain may comprise an amino acid sequence that is 100% identical to SEQ ID NOs: 9-12.

[0065] The immunoglobulin fusion protein may comprise (a) a region of an immunoglobulin heavy chain that is based on or derived from SEQ ID NO: 22; and (b) a region of an

immunoglobulin light chain that is based on or derived from SEQ ID NO: 12. The

immunoglobulin fusion protein may comprise (a) a region of an immunoglobulin heavy chain comprising an amino acid sequence that is at least about 50% identical to SEQ ID NO: 22; and (b) a region of an immunoglobulin light chain comprising an amino acid sequence that is at least about 50% identical to SEQ ID NO: 12. The region of an immunoglobulin heavy chain may comprise an amino acid sequence that is at least about 60%>, 70%, 75%, 80%>, 90%, 95%, or 97% identical to SEQ ID NO: 22. The region of an immunoglobulin heavy chain may comprise an amino acid sequence that is 100% identical to SEQ ID NO: 22. The region of an

immunoglobulin light chain may comprise an amino acid sequence that is at least about 60%, 70%, 75%, 80%, 90%, 95%, or 97% identical to SEQ ID NO: 12. The region of an

immunoglobulin light chain may comprise an amino acid sequence that is 100% identical to SEQ ID NO: 12.

[0066] The immunoglobulin fusion protein may comprise (a) a region of an immunoglobulin heavy chain encoded by a nucleotide sequence of SEQ ID NOs: 5-8, 17-19; and (b) a region of an immunoglobulin light chain encoded by a nucleotide sequence of SEQ ID NOs: 1-4. The immunoglobulin protein may comprise (a) a region of an immunoglobulin heavy chain encoded by a nucleotide sequence that is at least 50% or more identical to a nucleotide sequence of SEQ ID NOs: 5-8, 17-19; and (b) a region of an immunoglobulin light chain encoded by a nucleotide sequence that is at least 50% or more identical to a nucleotide sequence of SEQ ID NOs: 1-4. The region of an immunoglobulin heavy chain may be encoded by a nucleotide sequence that is at least 60%, 70%, 75%, 80%, 90%, 95%, or 97% or more identical to a nucleotide sequence of SEQ ID NOs: 5-8, 17-19. The region of an immunoglobulin heavy chain may be encoded by a nucleotide sequence that is 100% identical to a nucleotide sequence of SEQ ID NOs: 5-8, 17-19. The region of an immunoglobulin light chain may be encoded by a nucleotide sequence that is at least 60%, 70%, 75%, 80%, 90%, 95%, or 97% or more identical to a nucleotide sequence of SEQ ID NOs: 1-4. The region of an immunoglobulin light chain may be encoded by a nucleotide sequence that is 100% identical to a nucleotide sequence of SEQ ID NOs: 1-4.

[0067] The immunoglobulin glucagon fusion protein may comprise (a) a first immunoglobulin fusion protein encoded by a nucleotide sequence of any one of SEQ ID NOs: 17-19; and (b) a second immunoglobulin protein encoded by a nucleotide sequence of SEQ ID NO: 1. The immunoglobulin glucagon fusion protein may comprise (a) a first immunoglobulin fusion protein encoded by a nucleotide sequence that is at least 50% or more homologous to a nucleotide sequence of any one of SEQ ID NOs: 17-19; and (b) a second immunoglobulin protein encoded by a nucleotide sequence that is at least 50% or more homologous to a nucleotide sequence of SEQ ID NO: 1. In some embodiments, the first immunoglobulin fusion protein is encoded by a nucleotide sequence that is at least 60%, 70%, 75%, 80%, 90%, 95%, or 97%) or more homologous to a nucleotide sequence of any one of SEQ ID NOs: 17-19. In some embodiments, the second immunoglobulin protein is encoded by a nucleotide sequence that is at least 60%, 70%, 75%, 80%>, 90%, 95%, or 97% or more homologous to a nucleotide sequence of SEQ ID NO: 1.

[0068] In some embodiments, provided herein are immunoglobulin relaxin fusion proteins. In some embodiments, the immunoglobulin relaxin fusion proteins comprise an immunoglobulin light chain and/or heavy chain region fused at the amino terminus with a relaxin or a peptide derived from relaxin, which includes relaxins having internal linkers. In some embodiments, the immunoglobulin relaxin fusion proteins further comprise a second immunoglobulin light chain and/or heavy chain. In some embodiments, an immunoglobulin relaxin fusion protein refers to a first immunoglobulin chain comprising an amino-terminal relaxin peptide or derivative thereof and a second immunoglobulin chain. In some embodiments, the first immunoglobulin relaxin fusion protein is co-expressed with the second immunoglobulin chain. In some embodiments, the immunoglobulin relaxin fusion protein comprises a heavy chain having an amino acid sequence based on or derived from any one or more of SEQ ID NO: 20-22 and a light chain having an amino acid sequence based on or derived from any one or more of SEQ ID NO: 9-12. In some embodiments, the immunoglobulin relaxin fusion protein comprises a heavy chain having an amino acid sequence based on or derived from SEQ ID NO: 22 and a light chain having an amino acid sequence based on or derived from SEQ ID NO: 12. In some

embodiments, the immunoglobulin relaxin fusion proteins are configured to treat a disease or condition of the heart. In some embodiments, the immunoglobulin relaxin fusion proteins treat a disease or condition including heart failure, acute coronary syndrome, atrial fibrillation, cardiac fibrosis, coronary artery disease, ischemia reperfusion associated with solid organ transplant (e.g., lung, kidney, liver, heart), cardiopulmonary bypass for organ protection (e.g., renal), ischemic stroke, corneal healing (ocular administration), diabetic nephropathy, cirrhosis, portal hypertension, diabetic would healing, systemic sclerosis, cervical ripening at time of labor, preeclampsia, portal hypertension, fibrosis, pancreatitis, inflammation, cancer, scleroderma, pulmonary fibrosis, renal fibrosis, hepatic fibrosis, thromboembolic disorders, reperfusion damage following ischemia, micro- and macrovascular lesions (vasculitis), arterial and venous thromboses, edemas, ischemias such as myocardial infarction, stroke and transient ischemic attacks, for cardio protection in connection with coronary artery bypass operations (coronary artery bypass graft, CABG), primary percutaneous transluminal coronary angioplasties

(PTCAs), PTCAs after thrombolysis, rescue PTCA, heart transplants and open-heart operations, and for organ protection in connection with transplants, bypass operations, catheter

examinations and other surgical procedures. Further provided is the use of the compounds of the present disclosure for the prophylaxis and/or treatment of respiratory disorders, such as, for example, chronic obstructive pulmonary disease (chronic bronchitis, COPD), interstitial lung disease, asthma, pulmonary emphysema, bronchiectases, cystic fibrosis (mucoviscidosis) and pulmonary hypertension, in particular pulmonary arterial hypertension, and combinations thereof. In some embodiments, the immunoglobulin relaxin fusion proteins are configured to treat a disease or condition of the kidney. In some embodiments, the immunoglobulin relaxin fusion proteins treat a disease or condition including acute and chronic kidney diseases and acute and chronic renal insufficiencies, as well as acute and chronic renal failure, including acute and chronic stages of renal failure with and without the requirement of dialysis, as well as the underlying or related kidney diseases such as renal hypoperfusion, dialysis induced hypotension, glomerulopathies, glomerular and tubular proteinuria, renal edema, hematuria, primary, secondary, as well as acute and chronic glomerulonephritis, membranous and membranoproliferative glomerulonephritis, Alport-Syndrome, glomerulosclerosis, interstistial tubular diseases, nephropathic diseases, such as primary and inborn kidney diseases, renal inflammation, immunological renal diseases like renal transplant rejection, immune complex induced renal diseases, as well as intoxication induced nephropathic diseases, diabetic and non- diabetic renal diseases, pyelonephritis, cystic kidneys, nephrosclerosis, hypertensive

nephrosclerosis, nephrotic syndrome, that are characterized and diagnostically associated with an abnormal reduction in creatinine clearance and/or water excretion, abnormal increased blood concentrations of urea, nitrogen, potassium and/or creatinine, alteration in the activity of renal enzymes, such as glutamyl synthetase, urine osmolarity and urine volume, increased

microalbuminuria, macroalbuminuria, glomerular and arteriolar lesions, tubular dilation, hyperphosphatemia, the requirement of dialysis, renal carcinomas, after incomplete resection of the kidney, dehydration after overuse of diuretics, uncontrolled blood pressure increase with malignant hypertension, urinary tract obstruction and infection, amyloidosis, as well as systemic diseases associated with glomerular damage, such as Lupus erythematodes, and rheumatic immunological systemic diseases, as well as renal artery stenosis, renal artery thrombosis, renal vein thrombosis, analgetics induced nephropathy, renal tubular acidosis, and combinations thereof. In some embodiments, the immunoglobulin relaxin fusion proteins are configured to treat a disease or condition of the lung. In some embodiments the immunoglobulin relaxin fusion proteins treat a disease or condition including asthmatic disorders, pulmonary arterial hypertension (PAH) and other forms of pulmonary hypertension (PH) including left-heart disease, HIV, sickle cell anemia, thromboembolisms (CTEPH), sarcoidosis, COPD-associated pulmonary hypertension, pulmonary fibrosis-associated pulmonary hypertension, chronic- obstructive pulmonary disease (COPD), acute respiratory distress syndrome (ARDS), acute lung injury (ALI), alpha- 1 -antitrypsin deficiency (AATD), pulmonary fibrosis, pulmonary emphysema (for example pulmonary emphysema induced by cigarette smoke), cystic fibrosis (CF), and combinations thereof.

Immunoglobulin Region

[0069] The immunoglobulin fusion proteins disclosed herein comprise one or more

immunoglobulin regions. The immunoglobulin regions may comprise one or more portions of an antigen binding domain, wherein the antigen binding domain is not specific for a human antigen. In some cases, the immunoglobulin region is modified from a palivizumab antibody. The modification may include one or more amino acid mutations, insertions or deletions in one or more CDRs of the palivizumab antibody. As a non-limiting example, 1, 2, 3, 4 or 5 amino acids of the CDR3 of a palivizumab heavy chain sequence is modified.

[0070] The immunoglobulin region may comprise an entire immunoglobulin molecule or any polypeptide comprising fragment of an immunoglobulin including, but not limited to, heavy chain, light chain, variable domain, constant domain, complementarity determining region (CDR), framework region, fragment antigen binding (Fab) region, Fab', F(ab')2, F(ab')3, Fab', fragment crystallizable (Fc) region, single chain variable fragment (scFV), di-scFv, single domain immunoglobulin, trifunctional immunoglobulin, chemically linked F(ab')2, and any combination thereof. In some embodiments, an immunoglobulin heavy chain may comprise an entire heavy chain or a portion of a heavy chain. For example, a variable domain or region thereof derived from a heavy chain may be referred to as a heavy chain or a region of a heavy chain. In some embodiments, an immunoglobulin light chain may comprise an entire light chain or a portion of a light chain. For example, a variable domain or region thereof derived from a light chain may be referred to as a light chain or a region of a light chain. A single domain immunoglobulin includes, but is not limited to, a single monomeric variable immunoglobulin domain, for example, a shark variable new antigen receptor immunoglobulin fragment (VNAR).

[0071] The immunoglobulin may be derived from any type known to one of skill in the art including, but not limited to, IgA, IgD, IgE, IgG, IgM, IgY, IgW. The immunoglobulin region may comprise one or more units, including but not limited to, 1, 2, 3, 4, and 5 units. Functional units may include, but are not limited to, non-immunoglobulin regions, heavy chain, light chain, variable domain, constant domain, complementarity determining region (CDR), framework region, fragment antigen binding (Fab) region, Fab', F(ab')2, F(ab')3, Fab', fragment crystallizable (Fc) region, single chain variable fragment (scFV), di-scFv, single domain immunoglobulin, trifunctional immunoglobulin, chemically linked F(ab')2, and any combination or fragments thereof. Non-immunoglobulin regions include, but are not limited to,

carbohydrates, lipids, small molecules and therapeutic peptides. The immunoglobulin region may comprise one or more units connected by one or more disulfide bonds. The immunoglobulin region may comprise one or more units connected by a peptide linker, for example, a scFv immunoglobulin. The immunoglobulin may be a recombinant immunoglobulin including immunoglobulins with amino acid mutations, substitutions, and/or deletions. The immunoglobulin may be a recombinant immunoglobulin comprising chemical modifications. The immunoglobulin may comprise a whole or part of an immunoglobulin-drug conjugate.

[0072] The immunoglobulin region may comprise at least a portion of a human

immunoglobulin. The immunoglobulin region may comprise at least a portion of a humanized immunoglobulin. The immunoglobulin region may comprise at least a portion of a chimeric immunoglobulin. The immunoglobulin region may be based on or derived from a human immunoglobulin. The immunoglobulin region may be based on or derived from a humanized immunoglobulin. The immunoglobulin region may be based on or derived from a chimeric immunoglobulin. The immunoglobulin region may be based on or derived from a monoclonal immunoglobulin. The immunoglobulin region may be based on or derived from a polyclonal immunoglobulin. The immunoglobulin region may comprise at least a portion of an

immunoglobulin from a mammal, avian, reptile, amphibian, or a combination thereof. The mammal may be a human. The mammal may be a non-human primate. The mammal may be a dog, cat, sheep, goat, cow, rabbit, or mouse.

[0073] The immunoglobulin region may comprise at least a portion of an immunoglobulin heavy chain. The immunoglobulin region may comprise one or more immunoglobulin heavy chains or a portion thereof. The immunoglobulin region may comprise two or more

immunoglobulin heavy chains or a portion thereof. The immunoglobulin region may comprise an amino acid sequence that is at least about 50% homologous to an immunoglobulin heavy chain. The immunoglobulin region may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 92%, 95%, or 97% or more homologous to an immunoglobulin heavy chain. The immunoglobulin region may comprise an amino acid sequence that is at least about 70% homologous to an immunoglobulin heavy chain. The immunoglobulin region may comprise an amino acid sequence that is at least about 80% homologous to an immunoglobulin heavy chain. The immunoglobulin region may comprise an amino acid sequence that is at least about 90% homologous to an immunoglobulin heavy chain. The immunoglobulin heavy chain may comprise SEQ ID NOs: 13-16. In some embodiments, the immunoglobulin region comprises an amino acid sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to an amino acid sequence of any one of SEQ ID NOs: 13-16. In some embodiments, the immunoglobulin region comprises an amino acid sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%), or 97% identical to an amino acid sequence of any one of SEQ ID NOs: 13-16.

[0074] The immunoglobulin region may comprise an amino acid sequence comprising 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90 or more amino acids of an immunoglobulin heavy chain. The immunoglobulin region may comprise an amino acid sequence comprising 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900 or more amino acids of an

immunoglobulin heavy chain. The amino acids may be consecutive. Alternatively, or additionally, the amino acids are non-consecutive.

[0075] The immunoglobulin heavy chain may be encoded by a nucleotide sequence based on or derived from SEQ ID NOs: 5-8. The immunoglobulin heavy chain may be encoded by a nucleotide sequence that is at least about 50% homologous to SEQ ID NOs: 5-8. The

immunoglobulin heavy chain may be encoded by a nucleotide sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90% , 92%, 95%, or 97% or more homologous to SEQ ID NOs: 5-8. The immunoglobulin heavy chain may be encoded by a nucleotide sequence that is at least about 75% homologous to SEQ ID NOs: 5-8. The immunoglobulin heavy chain may be encoded by a nucleotide sequence that is at least about 85% homologous to SEQ ID NOs: 5-8. In some embodiments, the immunoglobulin region is encoded by a nucleotide sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to a nucleotide sequence of any one of SEQ ID NOs: 5-8. In some embodiments, the

immunoglobulin region is encoded by a nucleotide sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to a nucleotide sequence of any one of SEQ ID NOs: 5-8.

[0076] The immunoglobulin region may comprise at least a portion of an immunoglobulin light chain. The immunoglobulin region may comprise one or more immunoglobulin light chains or a portion thereof. The immunoglobulin region may comprise two or more immunoglobulin light chains or a portion thereof. The immunoglobulin region may comprise an amino acid sequence that is at least about 50% homologous to an immunoglobulin light chain. The immunoglobulin region may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%), 90%), 92%), 95%), or 97% or more homologous to an immunoglobulin light chain. The immunoglobulin region may comprise an amino acid sequence that is at least about 70% homologous to an immunoglobulin light chain. The immunoglobulin region may comprise an amino acid sequence that is at least about 80% homologous to an immunoglobulin light chain. The immunoglobulin region may comprise an amino acid sequence that is at least about 90% homologous to an immunoglobulin light chain. The immunoglobulin light chain may comprise SEQ ID NOs: 9-12. In some embodiments, the immunoglobulin region comprises an amino acid sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to an amino acid sequence of any one of SEQ ID NOs: 9-12. In some embodiments, the immunoglobulin region comprises an amino acid sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to an amino acid sequence of any one of SEQ ID NOs: 9-12.

[0077] The immunoglobulin region may comprise an amino acid sequence comprising 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90 or more amino acids of an immunoglobulin light chain. The immunoglobulin region may comprise an amino acid sequence comprising 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900 or more amino acids of an immunoglobulin light chain. The amino acids may be consecutive. Alternatively, or additionally, the amino acids are non-consecutive.

[0078] The immunoglobulin light chain may be encoded by a nucleotide sequence based on or derived from SEQ ID NOs: 1-4. The immunoglobulin light chain may be encoded by a nucleotide sequence that is at least about 50% homologous to SEQ ID NOs: 1-4. The

immunoglobulin light chain may be encoded by a nucleotide sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90% , 92%, 95%, or 97% or more homologous to SEQ ID NOs: 1- 4. The immunoglobulin light chain may be encoded by a nucleotide sequence that is at least about 75%) homologous to SEQ ID NOs: 1-4. The immunoglobulin light chain may be encoded by a nucleotide sequence that is at least about 85% homologous to SEQ ID NOs: 1-4. In some embodiments, the immunoglobulin region is encoded by a nucleotide sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to a nucleotide sequence of any one of SEQ ID NOs: 1-4. In some embodiments, the

immunoglobulin region is encoded by a nucleotide sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to a nucleotide sequence of any one of SEQ ID NOs: 1-4.

[0079] The immunoglobulin region may comprise at least a portion of a variable domain. The immunoglobulin region may comprise one or more variable domains or portions thereof. The immunoglobulin region may comprise 2, 3, 4, 5 or more variable domains or portions thereof. The immunoglobulin region may comprise an amino acid sequence comprising 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 120, 140, 160, 180, 200, 225, 250, 275, 300, 350, 400, 500 or more amino acids based on or derived from an amino acid sequence of one or more variable domains. The amino acids may be consecutive. The amino acids may be non-consecutive.

[0080] The immunoglobulin region may comprise at least a portion of a constant domain. The immunoglobulin region may comprise one or more constant domains or portions thereof. The immunoglobulin region may comprise 2, 3, 4, 5, 6, 7, 8, 9, 10 or more constant domains or portions thereof. The immunoglobulin region may comprise an amino acid sequence comprising 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 120, 140, 160, 180, 200, 225, 250, 275, 300, 350, 400, 500, 600, 700, 800, 900, 1000, 1200, 1400 or more amino acids based on or derived from an amino acid sequence of one or more constant domains. The amino acids may be consecutive. The amino acids may be non-consecutive.

[0081] The immunoglobulin region may comprise at least a portion of a complementarity- determining region (CDR). The immunoglobulin region may comprise one or more

complementarity-determining regions (CDRs) or portions thereof. The immunoglobulin region may comprise 2, 3, 4, 5 or more complementarity-determining regions (CDRs) or portions thereof. The immunoglobulin region may comprise 6, 7, 8 or more complementarity- determining regions (CDRs) or portions thereof. The immunoglobulin region may comprise four or more complementarity-determining regions (CDRs) or portions thereof. The immunoglobulin region may comprise 9, 10, 11 or more complementarity-determining regions (CDRs) or portions thereof. The one or more CDRs may be CDRl, CDR2, CDR3 or a combination thereof. The one or more CDRs may be CDRl . The one or more CDRs may be CDR2. The one or more CDRs may be CDR3. The CDR may be a heavy chain CDR. The one or more CDRs may be a light chain CDR.

[0082] The immunoglobulin region may comprise a heavy chain CDRl having an amino acid sequence based on or derived from SEQ ID NO: 72. The immunoglobulin region may comprise a heavy chain CDR2 having an amino acid sequence based on or derived from SEQ ID NO: 73. The immunoglobulin region may comprise a heavy chain CDR3 having an amino acid sequence based on or derived from any one of SEQ ID NOs: 74-88. The immunoglobulin region may comprise a light chain CDRl having an amino acid sequence based on or derived from SEQ ID NO: 89. The immunoglobulin region may comprise a light chain CDR2 having an amino acid sequence based on or derived from SEQ ID NO: 90. The immunoglobulin region may comprise a light chain CDR3 having an amino acid sequence based on or derived from any one of SEQ ID NOs: 91-97.

[0083] The immunoglobulin region may comprise a heavy chain CDRl having an amino acid sequence that is at least about 50% homologous to SEQ ID NO: 72. The immunoglobulin region may comprise a heavy chain CDRl having an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to SEQ ID NO: 72. The immunoglobulin region may comprise a heavy chain CDRl having an amino acid sequence that is at least about 70% homologous to SEQ ID NO: 72. The immunoglobulin region may comprise a heavy chain CDRl having an amino acid sequence that is at least about 90% homologous to SEQ ID NO: 72. The immunoglobulin region may comprise a heavy chain CDR2 having an amino acid sequence that is at least about 50% homologous to SEQ ID NO: 73. The immunoglobulin region may comprise a heavy chain CDR2 having an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to SEQ ID NO: 73. The immunoglobulin region may comprise a heavy chain CDR2 having an amino acid sequence that is at least about 70% homologous to SEQ ID NO: 73. The immunoglobulin region may comprise a heavy chain CDR2 having an amino acid sequence that is at least about 90% homologous to SEQ ID NO: 73. The immunoglobulin region may comprise a heavy chain CDR3 having an amino acid sequence that is at least about 50% homologous to any one of SEQ ID NOs: 74-88. The immunoglobulin region may comprise a heavy chain CDR3 having an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to any one of SEQ ID NOs: 74-88. The immunoglobulin region may comprise a heavy chain CDR3 having an amino acid sequence that is at least about 70% homologous to any one of SEQ ID NOs: 74-88. The immunoglobulin region may comprise a heavy chain CDR3 having an amino acid sequence that is at least about 90% homologous to any one of SEQ ID NOs: 74-88. The immunoglobulin region may comprise a light chain CDRl having an amino acid sequence that is at least about 50% homologous to SEQ ID NO: 89. The immunoglobulin region may comprise a light chain CDRl having an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to SEQ ID NO: 89. The immunoglobulin region may comprise a light chain CDRl having an amino acid sequence that is at least about 70% homologous to SEQ ID NO: 89. The immunoglobulin region may comprise a light chain CDRl having an amino acid sequence that is at least about 90% homologous to SEQ ID NO: 89. The immunoglobulin region may comprise a light chain CDR2 having an amino acid sequence that is at least about 50% homologous to SEQ ID NO: 90. The

immunoglobulin region may comprise a light chain CDR2 having an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to SEQ ID NO: 90. The immunoglobulin region may comprise a light chain CDR2 having an amino acid sequence that is at least about 70% homologous to SEQ ID NO: 90. The immunoglobulin region may comprise a light chain CDR2 having an amino acid sequence that is at least about 90% homologous to SEQ ID NO: 90. The immunoglobulin region may comprise a light chain CDR3 having an amino acid sequence that is at least about 50% homologous to any one of SEQ ID NOs: 91-97. The immunoglobulin region may comprise a light chain CDR3 having an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to any one of SEQ ID NOs: 91-97. The immunoglobulin region may comprise a light chain CDR3 having an amino acid sequence that is at least about 70% homologous to any one of SEQ ID NOs: 91-97. The immunoglobulin region may comprise a light chain CDR3 having an amino acid sequence that is at least about 90% homologous to any one of SEQ ID NOs: 91-97.

[0084] The immunoglobulin region may comprise an amino acid sequence comprising 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more amino acids based on or derived from an amino acid sequence of a CDR. The immunoglobulin region may comprise an amino acid sequence comprising 3 or more amino acids based on or derived from an amino acid sequence of a CDR. The immunoglobulin region may comprise an amino acid sequence comprising 5 or more amino acids based on or derived from an amino acid sequence of a CDR. The immunoglobulin region may comprise an amino acid sequence comprising 10 or more amino acids based on or derived from an amino acid sequence of a CDR. The amino acids may be consecutive. The amino acids may be non- consecutive.

[0085] The immunoglobulin region may be based on or derived from a palivizumab

immunoglobulin. The immunoglobulin region may comprise at least a portion of a palivizumab immunoglobulin. The immunoglobulin region may comprise an amino acid sequence that is at least about 50% homologous to at least a portion of a palivizumab immunoglobulin. The immunoglobulin region may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 92%, 95%, or 97% or more homologous to at least a portion of a palivizumab immunoglobulin. The immunoglobulin region may comprise an amino acid sequence that is at least about 70% homologous to at least a portion of a palivizumab

immunoglobulin. The immunoglobulin region may comprise an amino acid sequence that is at least about 80% homologous to at least a portion of a palivizumab immunoglobulin.

[0086] The immunoglobulin region may comprise an amino acid sequence that comprises 10, 20, 30, 40, 50, 60, 70, 80, 90 or more amino acids of a palivizumab immunoglobulin sequence. The immunoglobulin region may comprise an amino acid sequence that comprises 100, 200, 300, 400, 500, 600, 700, 800, 900 or more amino acids of a palivizumab immunoglobulin sequence. The immunoglobulin region may comprise an amino acid sequence that comprises 50 or more amino acids of a palivizumab immunoglobulin sequence. The immunoglobulin region may comprise an amino acid sequence that comprises 100 or more amino acids of a palivizumab immunoglobulin sequence. The immunoglobulin region may comprise an amino acid sequence that comprises 200 or more amino acids of a palivizumab immunoglobulin sequence.

[0087] The immunoglobulin region may comprise an amino acid sequence that comprises 10, 20, 30, 40, 50, 60, 70, 80, 90 or more consecutive amino acids of a palivizumab immunoglobulin sequence. The immunoglobulin region may comprise an amino acid sequence that comprises 100, 200, 300, 400, 500, 600, 700, 800, 900 or more consecutive amino acids of a palivizumab immunoglobulin sequence. The immunoglobulin region may comprise an amino acid sequence that comprises 50 or more consecutive amino acids of a palivizumab immunoglobulin sequence. The immunoglobulin region may comprise an amino acid sequence that comprises 100 or more consecutive amino acids of a palivizumab immunoglobulin sequence. The immunoglobulin region may comprise an amino acid sequence that comprises 200 or more consecutive amino acids of a palivizumab immunoglobulin sequence.

[0088] The immunoglobulin region may comprise a CDR sequence based on or derived from a palivizumab CDR sequence. The immunoglobulin region may comprise a palivizumab heavy chain CDRl having an amino acid sequence based on or derived from SEQ ID NO: 72. The immunoglobulin region may comprise a palivizumab heavy chain CDR2 having an amino acid sequence based on or derived from SEQ ID NO: 73. The immunoglobulin region may comprise a palivizumab heavy chain CDR3 having an amino acid sequence based on or derived from SEQ ID NO: 74. The immunoglobulin region may comprise a mutant palivizumab heavy chain CDR3 having an amino acid sequence based on or derived from any one of SEQ ID NOs: 75-88. The immunoglobulin region having a mutant palivizumab heavy chain CDR3 may have reduced binding to RSV-F than wildtype palivizumab. The immunoglobulin region may comprise a palivizumab light chain CDRl having an amino acid sequence based on or derived from SEQ ID NO: 89. The immunoglobulin region may comprise a palivizumab light chain CDR2 having an amino acid sequence based on or derived from SEQ ID NO: 90. The immunoglobulin region may comprise a palivizumab light chain CDR3 having an amino acid sequence based on or derived from SEQ ID NO: 91. The immunoglobulin region may comprise a mutant palivizumab light chain CDR3 having an amino acid sequence based on or derived from any one of SEQ ID NOs: 92-97. The immunoglobulin region having a mutant palivizumab light chain CDR3 may have reduced binding to RSV-F than wildtype palivizumab.

[0089] The immunoglobulin region may comprise an amino acid sequence that is based on or derived from any one of SEQ ID NOs: 10-14. The immunoglobulin region may comprise an amino acid sequence that is at least about 50% homologous to any one of SEQ ID NOs: 10-14. The immunoglobulin region may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to any one of SEQ ID NOs 10-14. The immunoglobulin region may comprise an amino acid sequence that is at least about 70% homologous to any one of SEQ ID NOs: 10-14. The immunoglobulin region may comprise an amino acid sequence that is at least about 80% homologous to any one of SEQ ID NOs: 10-14. The immunoglobulin region may comprise an amino acid sequence that is at least about 50% identical to any one of SEQ ID NOs: 10-14. The immunoglobulin region may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to any one of SEQ ID NOs 10-14. The immunoglobulin region may comprise an amino acid sequence that is at least about 70% identical to any one of SEQ ID NOs: 10-14. The immunoglobulin region may comprise an amino acid sequence that is at least about 80% identical to any one of SEQ ID NOs: 10-14. The immunoglobulin region may comprise an amino acid sequence that is 100% identical to any one of SEQ ID NOs: 10-14. In some embodiments, the immunoglobulin region comprises an amino acid sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to an amino acid sequence of any one of SEQ ID NOs: 10-14. In some embodiments, the

immunoglobulin region comprises an amino acid sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to an amino acid sequence of any one of SEQ ID NOs: 10-14. The immunoglobulin region includes a Fab region that is based on or derived from a sequence from any one of SEQ ID NOs: 10-14. In some embodiments, the immunoglobulin region comprises an amino acid Fab sequence derived from a sequence that is at least about 70%, 80%, 80%, 90%, 95% or 100% to any one of SEQ ID NOs: 10-14.

[0090] The immunoglobulin region may comprise an amino acid sequence comprising 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 or more amino acids based on or derived from any one of SEQ ID NOs: 10-14. The immunoglobulin region may comprise an amino acid sequence comprising 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 450, 500 or more amino acids based on or derived from any one of SEQ ID NOs: 10-14. The immunoglobulin region may comprise an amino acid sequence comprising 10 or more amino acids based on or derived from any one of SEQ ID NOs: 10-14. The immunoglobulin region may comprise an amino acid sequence comprising 50 or more amino acids based on or derived from any one of SEQ ID NOs: 10-14. The immunoglobulin region may comprise an amino acid sequence comprising 100 or more amino acids based on or derived from any one of SEQ ID NOs: 10-14. The immunoglobulin region may comprise an amino acid sequence comprising 200 or more amino acids based on or derived from any one of SEQ ID NOs: 10-14. The amino acids may be consecutive. Alternatively, or additionally, the amino acids are nonconsecutive. In some embodiments, the immunoglobulin region may comprise amino acids derived from any one of SEQ ID NOs: 10-14 and amino acids not derived from any one of SEQ ID NOs: 10-14. In some embodiments, the immunoglobulin region may comprise amino acids derived from one or more of SEQ ID NOs: 10-14 and amino acids not derived from any one of SEQ ID NOs: 10-14. In some embodiments, the immunoglobulin region comprises amino acids derived from 1, 2, 3, or 4 of SEQ ID NOs: 10-14.

[0091] The immunoglobulin region may be encoded by a nucleotide sequence that is based on or derived from any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence that is at least about 50% homologous to any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence that is at least about 70% homologous to any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence that is at least about 80% homologous to any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence that is at least about 50% identical to any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence that is at least about 70% identical to any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence that is at least about 80% identical to any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence that is 100% identical to any one of SEQ ID NOs: 3-7. The

immunoglobulin region includes a Fab region that is based on or derived from a sequence from any one of SEQ ID NOs: 3-7. In some embodiments, the immunoglobulin region comprises an amino acid Fab sequence derived from a sequence that is at least about 70%, 80%, 80%, 90%, 95% or 100% to any one of SEQ ID NOs: 3-7.

[0092] The immunoglobulin region may be encoded by a nucleotide sequence comprising 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 or more nucleotides based on or derived from any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence comprising 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 450, 500 or more nucleotides based on or derived from any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence comprising 600, 650, 700, 750, 800, 850, 900, 950, 1000 or more nucleotides based on or derived from any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence comprising 1100, 1200, 1300, 1400, 1500 or more nucleotides based on or derived from any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence comprising 100 or more nucleotides based on or derived from any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence comprising 500 or more nucleotides based on or derived from any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence comprising 1000 or more nucleotides based on or derived from any one of SEQ ID NOs: 3-7. The immunoglobulin region may be encoded by a nucleotide sequence comprising 1300 or more nucleotides based on or derived from any one of SEQ ID NOs: 3-7. The nucleotides may be consecutive. In some embodiments, the immunoglobulin region is encoded by a nucleotide sequence comprising nucleotides derived from any one of SEQ ID NOs: 3-7 and nucleotides not derived from any one of SEQ ID NOs: 3-7. In some embodiments, the immunoglobulin region is encoded by a nucleotide sequence comprising nucleotides derived from one or more of SEQ ID NOs: 3-7 and nucleotides not derived from any one of SEQ ID NOs: 3-7. In some embodiments, the immunoglobulin region is encoded by a nucleotide sequence derived from 1, 2, 3, or 4 of SEQ ID NOs: 3-7.

Relaxin Therapeutic Peptide

[0093] In one aspect of the disclosure, provided herein are immunoglobulin fusion proteins comprising a therapeutic peptide and an immunoglobulin region. The immunoglobulin fusion proteins may comprise two or more therapeutic peptides. The immunoglobulin fusion proteins disclosed herein may comprise 3, 4, 5, or more therapeutic peptides. The therapeutic peptide may be attached to an immunoglobulin region via a connecting peptide. In some embodiments, one or more additional therapeutic peptides are attached to the first or a second immunoglobulin region. The one or more therapeutic peptides may be attached to one or more immunoglobulin regions. The two or more therapeutic peptides may be attached to two or more immunoglobulin regions. The two or more therapeutic peptides may be attached to one or more immunoglobulin chains. The two or more therapeutic peptides may be attached to two or more immunoglobulin chains. The two or more therapeutic peptides may be attached to one or more units within the one or more immunoglobulin regions. The two or therapeutic peptides may be attached to two or more units within the one or more immunoglobulin regions. In some embodiments, the therapeutic peptide is connected to the immunoglobulin region without the aid of a connecting peptide.

[0094] The immunoglobulin fusion proteins disclosed herein may comprise one or more therapeutic agents. The therapeutic agent may be a peptide. The therapeutic agent may be a small molecule. The immunoglobulin fusion proteins disclosed herein may comprise two or more therapeutic agents. The immunoglobulin fusion proteins disclosed herein may comprise 3, 4, 5, 6 or more therapeutic agents. The two or more therapeutic agents may be the same. The two or more therapeutic agents may be different.

[0095] The therapeutic peptide may comprise any secondary structure, for example alpha helix or beta strand or comprise no regular secondary structure. The therapeutic peptide may comprise amino acids with one or more modifications including, but not limited to,

myristoylation, palmitoylation, isoprenylation, glypiation, lipoylation, acylation, acetylation, aklylation, methylation, glycosylation, malonylation, hydroxylation, iodination, nucleotide addition, oxidation, phosphorylation, adenylylation, propionylation, succinylation, sulfation, selenoylation, biotinylation, pegylation, deimination, deamidation, eliminylation, and carbamylation. The therapeutic peptide may comprise one or more amino acids conjugated to one or more small molecules, for example a drug. In some embodiments, the therapeutic peptide comprises one or more non-natural amino acids. In some embodiments, the therapeutic peptide comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 30, 40, 50 or more non-natural amino acids. In some embodiments, the therapeutic peptide comprises one or more amino acids substitutions. In some embodiments, the therapeutic peptide comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 30, 40, 50 or more amino acid substitutions.

[0096] In some embodiments, one or more regions of the therapeutic peptide is configured to treat heart failure and/or fibrosis. In some embodiments, one or more regions of the therapeutic peptide is configured to treat heart failure and/or fibrosis related conditions. In some

embodiments, 2, 3, 4, 5 or more regions of the therapeutic peptide are configured to treat heart failure and/or fibrosis. In some embodiments, 2, 3, 4, 5 or more regions of the therapeutic peptide are configured to treat heart failure and/or fibrosis related conditions. Heart failure related conditions may include coronary heart disease, high blood pressure, diabetes, cardiomyopathy, heart valve disease, arrhythmias, congenital heart defects, obstructive sleep apnea, myocarditis, hyperthyroidism, hypothyroidism, emphysema, hemochromatosis, and amyloidosis. Heart failure may be left-sided heart failure, right-sided heart failure, systolic heart failure, and diastolic heart failure. Fibrosis may include, but is not limited to, pulmonary fibrosis, idiopathic pulmonary fibrosis, cystic fibrosis, cirrhosis, endomyocardial fibrosis, myocardial infarction, atrial fibrosis, mediastinal fibrosis, myelofibrosis, retroperitoneal fibrosis, progressive massive fibrosis, nephrogenic systemic fibrosis, Crohn's disease, keloid, scleroderma/systemic sclerosis, arthrofibrosis, Peyronie's disease, Dupuytren's contracture, and adhesive capsulitis.

[0097] In some embodiments, one or more regions of the therapeutic peptide comprises an amino acid sequence based on or derived from an amino acid sequence of a relaxin peptide. In some embodiments, one or more regions of the therapeutic peptide comprises an amino acid sequence based on or derived from an amino acid sequence of a relaxin-2 peptide.

[0098] In some embodiments, one or more regions of the therapeutic peptide is configured to treat heart failure. Said heart failure may comprise one or more of acute decompensated heart failure, right heart failure, left heart failure, global failure, ischemic cardiomyopathy, dilated cardiomyopathy, heart failure associated with congenital heart defects, heart failure associated with heart valve defects, mitral stenosis, mitral insufficiency, aortic stenosis, aortic

insufficiency, tricuspid stenosis, tricuspid insufficiency, pulmonary stenosis, pulmonary valve insufficiency, heart failure associated with combined heart valve defects, myocardial

inflammation (myocarditis), chronic myocarditis, acute myocarditis, viral myocarditis, diabetic heart failure, alcoholic cardiomyopathy, heart failure associated with cardiac storage disorders, diastolic heart failure, and systolic heart failure. In some embodiments, one or more regions of the therapeutic peptide is configured to treat cardiovascular disease, lung disease, fibrotic disease, kidney disease, pancreatitis, inflammation, cancer, scleroderma, pulmonary fibrosis, renal fibrosis, hepatic fibrosis, fibrosis of the lung, heart, kidney, bone marrow, liver, dermatological fibrosis, fibrotic eye disorder, ischemia, Alzheimer's disease, corneal injury, neurodegenerative disease, cardiovascular disease, fibrotic disease, failure, pancreatitis, inflammation, cancer, scleroderma, pulmonary fibrosis, renal fibrosis, hepatic fibrosis, thromboembolic disorders, reperfusion damage following ischemia, micro- and macrovascular lesions (vasculitis), arterial and venous thromboses, edemas, ischemias, myocardial infarction, stroke, transient ischemic attack, cardio protection in connection with coronary artery bypass operations, cardio protection in connection with primary percutaneous transluminal coronary angioplasties (PTCAs), PTCAs after thrombolysis, rescue PTCA, heart transplants and open- heart operations, organ protection in connection with transplants, bypass operations, catheter examinations and other surgical procedures, respiratory disorders, chronic obstructive pulmonary disease, chronic bronchitis, interstitial lung disease, asthma, pulmonary emphysema, bronchiectases, cystic fibrosis (mucoviscidosis) and pulmonary hypertension, in particular pulmonary arterial hypertension, kidney disease, acute and chronic kidney diseases and acute and chronic renal insufficiencies, as well as acute and chronic renal failure with or without the requirement of dialysis, underlying or related kidney diseases, renal hypoperfusion, dialysis induced hypotension, glomerulopathies, glomerular and tubular proteinuria, renal edema, hematuria, chronic glomerulonephritis (including primary, secondary, or acute), membranous and membranoproliferative glomerulonephritis, Alport-Syndrome, glomerulosclerosis, interstistial tubular diseases, nephropathic diseases, primary and inborn kidney diseases, renal inflammation, immunological renal diseases, renal transplant rejection, immune complex induced renal diseases, intoxication induced nephropathic diseases, diabetic and non-diabetic renal diseases, pyelonephritis, cystic kidneys, nephrosclerosis, hypertensive nephrosclerosis, nephrotic syndrome, diseases that are characterized and diagnostically associated with an abnormal reduction in creatinine clearance and/or water excretion, abnormal increased blood concentrations of urea, nitrogen, potassium and/or creatinine, alteration in the activity of renal enzymes including without limitation glutamyl synthetase, urine osmolality and urine volume, increased microalbuminuria, macroalbuminuria, glomerular and arteriolar lesions, tubular dilation, hyperphosphatemia, disease requiring dialysis for treatment, renal carcinomas, after incomplete resection of the kidney, dehydration after overuse of diuretics, uncontrolled blood pressure increase with malignant hypertension, urinary tract obstruction and infection, amyloidosis, systemic diseases associated with glomerular damage, Lupus erythematosus, rheumatic immunological systemic diseases, renal artery stenosis, renal artery thrombosis, renal vein thrombosis, analgetics induced nephropathy, polycystic kidney disease, renal tubular acidosis, contrast medium induced and drug induced acute and chronic interstitial kidney diseases, metabolic syndrome, dyslipemia, aftereffects associated with acute and/or chronic kidney diseases, pulmonary edema, heart failure, uremia, anemia, electrolyte disturbances, hyperkalemia, hyponatremia, bony and carbohydrate metabolism, lung diseases, asthmatic disorders, pulmonary arterial hypertension (PAH), pulmonary hypertension (PH), left-heart disease, HIV, sickle cell anemia, thromboembolisms (CTEPH), sarcoidosis, COPD-associated pulmonary hypertension, pulmonary fibrosis-associated pulmonary hypertension, chronic obstructive pulmonary disease (COPD), acute respiratory distress syndrome (ARDS), acute lung injury (ALI), alpha- 1 -antitrypsin deficiency (AATD), pulmonary fibrosis, pulmonary

emphysema, pulmonary emphysema induced by cigarette smoke, cystic fibrosis (CF), fibrotic disorders, fibrotic disorders of the internal organs, fibrotic disorders of the lung, fibrotic disorders of the heart, fibrotic disorders of the kidney, fibrotic disorders of the bone marrow fibrotic disorders of the liver, dermatological fibroses, fibrotic eye disorders, osteodegenerative joint dysfunction, angiotensin-II (Angll)-mediated vasoconstriction, endothelin-1 (ET-1)- mediated vasoconstriction, ischemic conditions, ischemia associated with myocardial infarct ischemia associated with wounds, renal pathologies, renal pathologies related to

vasoconstriction, hypertension, atherosclerosis, Type 1 diabetes, Type 2 diabetes, coronary artery disease, scleroderma, stroke, diastolic dysfunction, familial hypercholesterolemia, isolated systolic hypertension, primary hypertension, secondary hypertension, left ventricular

hypertrophy, arterial stiffness associated with long-term tobacco smoking, arterial stiffness associated with obesity, arterial stiffness associated with age, systemic lupus erythematosus, preeclampsia, or hypercholesterolemia.

[0099] In some embodiments, amino acids of the therapeutic peptide, in whole or in part, are based on or derived from any one of SEQ ID NOs: 37-52. The therapeutic peptide may comprise an amino acid sequence that is at least about 50% homologous to any one of SEQ ID NOs: 37- 52. The therapeutic peptide may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% homologous to any one of SEQ ID NOs: 37-52. The therapeutic peptide may comprise an amino acid sequence that is at least about 70% homologous to any one of SEQ ID NOs: 37-52. The therapeutic peptide may comprise an amino acid sequence that is at least about 80% homologous to any one of SEQ ID NOs: 37-52. The therapeutic peptide may comprise an amino acid sequence that is at least about 50% identical to any one of SEQ ID NOs: 37-52. The therapeutic peptide may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to any one of SEQ ID NOs: 37-52. The therapeutic peptide may comprise an amino acid sequence that is at least about 70% identical to any one of SEQ ID NOs: 37-52. The therapeutic peptide may comprise an amino acid sequence that is at least about 80% identical to any one of SEQ ID NOs: 37-52. The therapeutic peptide may comprise an amino acid sequence that is 100% identical to any one of SEQ ID NOs: 37-52. In some embodiments, the therapeutic peptide comprises an amino acid sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%), or 97% homologous to an amino acid sequence of any one of SEQ ID NOs: 37-52. In some embodiments, the therapeutic peptide comprises an amino acid sequence that is at least about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 97% identical to an amino acid sequence of any one of SEQ ID NOs: 37-52. In some embodiments, the therapeutic peptide comprises an amino acid sequence that is 100% identical to an amino acid sequence of any one of SEQ ID NOs: 37-52.

[00100] The therapeutic peptide may comprise an amino acid sequence comprising 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 or more amino acids based on or derived from any one of SEQ ID NOs: 37-52. The therapeutic peptide may comprise an amino acid sequence comprising 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 450, 500 or more amino acids based on or derived from any one of SEQ ID NOs: 37-52. The therapeutic peptide may comprise an amino acid sequence comprising 10 or more amino acids based on or derived from any one of SEQ ID NOs: 37-52. The therapeutic peptide may comprise an amino acid sequence comprising 50 or more amino acids based on or derived from any one of SEQ ID NOs: 37-52. The therapeutic peptide may comprise an amino acid sequence comprising 100 or more amino acids based on or derived from any one of SEQ ID NOs: 37-52. The therapeutic peptide may comprise an amino acid sequence comprising 200 or more amino acids based on or derived from any one of SEQ ID NOs: 37-52. The amino acids may be consecutive. Alternatively, or additionally, the amino acids are nonconsecutive. In some embodiments, the therapeutic peptide may comprise amino acids derived from any one of SEQ ID NOs: 37-52 and amino acids not derived from any one of SEQ ID NOs: 37-52. In some embodiments, the therapeutic peptide may comprise amino acids derived from one or more of SEQ ID NOs: 37-52 and amino acids not derived from any one of SEQ ID NOs: 37-52. In some embodiments, the therapeutic peptide comprises amino acids derived from 1, 2, 3, or 4 of SEQ ID NOs: 37-52.

[00101] The therapeutic peptide may comprise a protease cleavage site. The protease cleavage site may be inserted within the therapeutic peptide. In some embodiments, the therapeutic peptide comprises a first therapeutic peptide region and a second therapeutic peptide region. In some embodiments, the therapeutic peptide comprises a protease cleavage site disposed between the first therapeutic peptide region and the second therapeutic peptide region. In some embodiments, the first therapeutic peptide region and the second therapeutic peptide region are derived from the same protein or set of amino acid sequences. In some embodiments, the first therapeutic peptide region and the second therapeutic peptide regions are derived from different proteins or sets of amino acid sequences. The one or more protease cleavage sites may be attached to the N-terminus, C-terminus or both the N- and C-termini of a region of a therapeutic peptide.

[00102] The therapeutic peptide may comprise one or more linker peptides. The therapeutic peptide may comprise two or more linker peptides. The therapeutic peptide may comprise 3, 4, 5, 6, 7 or more linker peptides. The linker peptides may be different. The linker peptides may be the same. The linker peptide may be inserted within the therapeutic peptide. In some embodiments, the therapeutic peptide comprises a first therapeutic region, a second therapeutic region, an one or more linker peptides positioned between the first therapeutic region and the second therapeutic region. The one or more linker peptides may be attached to the N-terminus, C-terminus or both the N- and C-termini of a region of a therapeutic peptide. In some embodiments, the linker peptide is derived from amino acids of any of SEQ ID NOs: 61-62.

[00103] The therapeutic peptide may comprise one or more internal linker. The internal linker may be inserted within the therapeutic peptide. In some embodiments, the therapeutic peptide comprises a first therapeutic peptide region and a second therapeutic peptide region. In some embodiments, the therapeutic peptide comprises a internal linker disposed between the first therapeutic peptide region and the second therapeutic peptide region. In some embodiments, the first therapeutic peptide region and the second therapeutic peptide region are derived from the same protein or set of amino acid sequences. In some embodiments, the first therapeutic peptide region and the second therapeutic peptide regions are derived from different proteins or sets of amino acid sequences. In some embodiments, the internal linker is derived from amino acids of any of SEQ ID NOs: 63-71. In some embodiments, the internal linker comprises amino acids having repeating sequences. In some embodiments, the internal linker has 2, 3, 4, 5, 6, 7, 8, 9, 10 or more repeating sequences. In some embodiments, the internal linker is low immunogenic. In some embodiments, the internal linker is biodegradable.

Linkers and Connecting Peptides

[00104] The immunoglobulin fusion proteins, immunoglobulin regions, therapeutic peptides, and/or non-immunoglobulin regions may further comprise one or more linkers. The

immunoglobulin fusion proteins, immunoglobulin regions, and/or non-immunoglobulin regions may further comprise 2, 3, 4, 5, 6, 7, 8, 9, 10 or more linkers. [00105] The one or more linkers are attached to the N-terminus, C-terminus or both N- and C- termini of a therapeutic peptide. The one or more linkers are attached to the N-terminus, C- terminus or both N- and C-termini of a proteolytic cleavage site. The one or more linkers may be attached to a therapeutic peptide, proteolytic cleavage site, immunoglobulin region, non- immunoglobulin region or a combination thereof.

[00106] The one or more linkers may comprise an amino acid sequence selected from any one of SEQ ID NOs:61-62. The one or more linkers may comprise an amino acid sequence that is at least about 50% homologous to any one of SEQ ID NOs: 61-62. The one or more linkers may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or more homologous to any one of SEQ ID NOs: 61-62. The one or more linkers may comprise an amino acid sequence that is at least about 70% homologous to any one of SEQ ID NOs: 61-62. The one or more linkers may comprise an amino acid sequence that is at least about 80% homologous to any one of SEQ ID NOs: 61-62.

[00107] In some embodiments, the linker is a connecting linker. The connecting linker may link the therapeutic peptide to an immunoglobulin region. The connecting linker may comprise an amino acid sequence that is at least about 50% homologous to any of SEQ ID NOs: 53-60. The connecting linker may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or more homologous to any one of SEQ ID NOs: 53-60. The connecting linker may comprise an amino acid sequence that is at least about 70% homologous to any one of SEQ ID NOs: 53-60. The connecting linker may comprise an amino acid sequence that is at least about 80% homologous to any one of SEQ ID NOs: 53-60.

[00108] In some embodiments, the linker is an internal linker. The internal linker may be a portion of a therapeutic peptide. The internal linker may link two regions of a therapeutic peptide. The internal linker may link two therapeutic peptides derived from two different peptides or proteins. The internal linker may link two therapeutic peptides derived from the same peptide or protein. The internal linker may comprise an amino acid sequence that is at least about 50% homologous to any of SEQ ID NOs: 63-71. The internal linker may comprise an amino acid sequence that is at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or more homologous to any one of SEQ ID NOs: 63-71. The internal linker may comprise an amino acid sequence that is at least about 70% homologous to any one of SEQ ID NOs: 63-71. The internal linker may comprise an amino acid sequence that is at least about 80% homologous to any one of SEQ ID NOs: 63-71. Proteolytic Cleavage Site

[00109] The immunoglobulin fusion proteins disclosed herein may further comprise one or more proteolytic cleavage sites. The immunoglobulin fusion proteins disclosed herein may further comprise 2 or more proteolytic cleavage sites. The immunoglobulin fusion proteins disclosed herein may further comprise 3 or more proteolytic cleavage sites. The immunoglobulin fusion proteins disclosed herein may further comprise 4, 5, 6, 7 or more proteolytic cleavage sites. The therapeutic peptides disclosed herein may further comprise one or more proteolytic cleavage sites.

[00110] The one or more proteolytic cleavage sites may be attached to the N-terminus, C- terminus or both N- and C-termini of a therapeutic peptide. The one or more proteolytic cleavage sites may attached to the N-terminus, C-terminus or both N- and C-termini of a linker. The one or more proteolytic cleavage sites may be attached to a therapeutic peptide, linker, immunoglobulin region, non-immunoglobulin region or a combination thereof.

[00111] In some embodiments, the proteolytic cleavage site is located within the amino acid sequence of the therapeutic peptide, immunoglobulin region, or a combination thereof. The therapeutic peptide may comprise one or more proteolytic cleavage sites within its amino acid sequence. For example, SEQ ID NOs: 37-39 disclose a relaxin protein comprising two internal proteolytic cleavage sites.

[00112] Two or more proteolytic cleavage sites may surround a therapeutic peptide, linker, immunoglobulin region, or combination thereof. Digestion of the proteolytic cleavage site may result in release of a peptide fragment located between the two or more proteolytic cleavage sites. For example, the proteolytic cleavage sites may flank a therapeutic peptide-linker peptide. Digestion of the proteolytic cleavage sites may result in release of the therapeutic peptide-linker.

[00113] The proteolytic cleavage site may be recognized by one or more proteases. The one or more proteases may be a serine protease, threonine protease, cysteine protease, aspartate protease, glutamic protease, metalloprotease, exopeptidases, endopeptidases, or a combination thereof. The proteases may be selected from the group comprising Factor VII or Factor Xa. Additional examples of proteases include, but are not limited to, aminopeptidases,

carboxypeptidases, trypsin, chymotrypsin, pepsin, papain, and elastase. The protease may be PC2. In some embodiments, the protease recognizes the amino acid sequence KR. In some embodiments, the protease recognizes the amino acid sequence RKKR.

Vectors, Host Cells and Recombinant Methods

[00114] Immunoglobulin fusion proteins, as disclosed herein, may be expressed and purified by known recombinant and protein purification methods. In some instances, the activity of the immunoglobulin fusion protein is affected by expression and/or purification methods. For example, the activity of an immunoglobulin fusion protein configured for use as a therapeutic, is enhanced or attenuated based on the identity of the expression vector, identity of the

recombinant host, identity of the cell line, expression reaction conditions, purification methods, protein processing, or any combination thereof. Expression reaction conditions include, but are not limited to, temperature, % C0₂, media, expression time, cofactors, and chaperones.

Purification methods include, but are not limited to, purification temperatures, chromatography resins, protease inhibitors, and buffer compositions.

[00115] Immunoglobulin fusion proteins, as disclosed herein, may be expressed by

recombinant methods. Generally, a nucleic acid encoding an immunoglobulin fusion protein may be isolated and inserted into a replicable vector for further cloning (amplification of the DNA) or for expression. DNA encoding the immunoglobulin fusion protein may be prepared by PCR amplification and sequenced using conventional procedures (e.g., by using oligonucleotide probes that are capable of binding specifically to nucleotides encoding Immunoglobulin fusion proteins). In an exemplary embodiment, nucleic acid encoding an immunoglobulin fusion protein is PCR amplified, restriction enzyme digested and gel purified. The digested nucleic acid may be inserted into a replicable vector. The replicable vector containing the digested

immunoglobulin fusion protein insertion may be transformed or transduced into a host cell for further cloning (amplification of the DNA) or for expression. Host cells may be prokaryotic or eukaryotic cells.

[00116] Polynucleotide sequences encoding polypeptide components (e.g., immunoglobulin region, therapeutic peptide) of the immunoglobulin fusion proteins may be obtained by PCR amplification. Polynucleotide sequences may be isolated and sequenced from cells containing nucleic acids encoding the polypeptide components. Alternatively, or additionally,

polynucleotides may be synthesized using nucleotide synthesizer or PCR techniques. Once obtained, sequences encoding the polypeptide components may be inserted into a recombinant vector capable of replicating and expressing heterologous polynucleotides in prokaryotic and/or eukaryotic hosts.

[00117] In addition, phage vectors containing replicon and control sequences that are compatible with the host microorganism may be used as transforming vectors in connection with these hosts. For example, bacteriophage such as GEM™-11 may be utilized in making a recombinant vector which may be used to transform susceptible host cells such as E. coli LE392.

[00118] Immunoglobulin fusion proteins may be expressed intracellularly (e.g., cytoplasm) or extracellularly (e.g., secretion). For extracellular expression, the vector may comprise a secretion signal which enables translocation of the immunoglobulin fusion proteins to the outside of the cell.

[00119] Suitable host cells for cloning or expression of immunoglobulin fusion proteins- encoding vectors include prokaryotic or eukaryotic cells. The host cell may be a eukaryotic. Examples of eukaryotic cells include, but are not limited to, Human Embryonic Kidney (HEK) cell, Chinese Hamster Ovary (CHO) cell, fungi, yeasts, invertebrate cells (e.g., plant cells and insect cells), lymphoid cell (e.g., YO, NSO, Sp20 cell). Other examples of suitable mammalian host cell lines are monkey kidney CVl line transformed by SV40 (COS-7); baby hamster kidney cells (BHK); mouse Sertoli cells; monkey kidney cells (CVl); African green monkey kidney cells (VERO-76); human cervical carcinoma cells (HELA); canine kidney cells (MDCK; buffalo rat liver cells (BRL 3 A); human lung cells (W138); human liver cells (Hep G2); mouse mammary tumor (MMT 060562); TRl cells; MRC 5 cells; and FS4 cells. The host cell may be a prokaryotic cell (e.g., E. coli ).

[00120] Host cells may be transformed with vectors containing nucleotides encoding an immunoglobulin fusion proteins. Transformed host cells may be cultured in media. The media may be supplemented with one or more agents for inducing promoters, selecting transformants, or amplifying or expressing the genes encoding the desired sequences. Methods for transforming host cells are known in the art and may include electroporation, calcium chloride, or

polyethylene glycol/DMSO.

[00121] Alternatively, host cells may be transfected or transduced with vectors containing nucleotides encoding an immunoglobulin fusion proteins. Transfected or transduced host cells may be cultured in media. The media may be supplemented with one or more agents for inducing promoters, selecting transfected or transduced cells, or expressing genes encoding the desired sequences.

[00122] The expressed immunoglobulin fusion proteins may be secreted into and recovered from the periplasm of the host cells or transported into the culture media. Protein recovery from the periplasm may involve disrupting the host cell. Disruption of the host cell may comprise osmotic shock, sonication or lysis. Centrifugation or filtration may be used to remove cell debris or whole cells. The immunoglobulin fusion proteins may be further purified, for example, by affinity resin chromatography.

[00123] Alternatively, immunoglobulin fusion proteins that are secreted into the culture media may be isolated therein. Cells may be removed from the culture and the culture supernatant being filtered and concentrated for further purification of the proteins produced. The expressed polypeptides may be further isolated and identified using commonly known methods such as polyacrylamide gel electrophoresis (PAGE) and Western blot assay. [00124] Immunoglobulin fusion proteins production may be conducted in large quantity by a fermentation process. Various large-scale fed-batch fermentation procedures are available for production of recombinant proteins. Large-scale fermentations have at least 1000 liters of capacity, preferably about 1,000 to 100,000 liters of capacity. These fermentors use agitator impellers to distribute oxygen and nutrients, especially glucose (a preferred carbon/energy source). Small scale fermentation refers generally to fermentation in a fermentor that is no more than approximately 100 liters in volumetric capacity, and can range from about 1 liter to about 100 liters.

[00125] In a fermentation process, induction of protein expression is typically initiated after the cells have been grown under suitable conditions to a desired density, e.g., an OD550 of about 180-220, at which stage the cells are in the early stationary phase. A variety of inducers may be used, according to the vector construct employed, as is known in the art and described herein. Cells may be grown for shorter periods prior to induction. Cells are usually induced for about 12-50 hours, although longer or shorter induction time may be used.

[00126] To improve the production yield and quality of the immunoglobulin fusion proteins disclosed herein, various fermentation conditions may be modified. For example, to improve the proper assembly and folding of the secreted immunoglobulin fusion proteins polypeptides, additional vectors overexpressing chaperone proteins, such as Dsb proteins (DsbA, DsbB, DsbC, DsbD and or DsbG) or FkpA (a peptidylprolyl cis,trans-isom erase with chaperone activity) may be used to co-transform the host prokaryotic cells. The chaperone proteins have been

demonstrated to facilitate the proper folding and solubility of heterologous proteins produced in bacterial host cells.

[00127] To minimize proteolysis of expressed heterologous proteins (especially those that are proteolytically sensitive), certain host strains deficient for proteolytic enzymes may be used for the present disclosure. For example, host cell strains may be modified to effect genetic mutation(s) in the genes encoding known bacterial proteases such as Protease III, OmpT, DegP, Tsp, Protease I, Protease Mi, Protease V, Protease VI and combinations thereof. Some E. coli protease-deficient strains are available.

[00128] Standard protein purification methods known in the art may be employed. The following procedures are exemplary of suitable purification procedures: fractionation on immunoaffinity or ion-exchange columns, ethanol precipitation, reverse phase UPLC, chromatography on silica or on a cation-exchange resin such as DEAE, chromatofocusing, SDS- PAGE, ammonium sulfate precipitation, hydroxyl apatite chromatography, gel electrophoresis, dialysis, and affinity chromatography and gel filtration using, for example, Sephadex G-75. [00129] Immunoglobulin fusion proteins may be concentrated using a commercially available protein concentration filter, for example, an Amicon or Millipore Pellicon^® ultrafiltration unit.

[00130] Protease inhibitors or protease inhibitor cocktails may be included in any of the foregoing steps to inhibit proteolysis of the immunoglobulin fusion proteins.

[00131] In some cases, an immunoglobulin fusion protein may not be biologically active upon isolation. Various methods for "refolding" or converting a polypeptide to its tertiary structure and generating disulfide linkages, may be used to restore biological activity. Such methods include exposing the solubilized polypeptide to a pH usually above 7 and in the presence of a particular concentration of a chaotrope. The selection of chaotrope is very similar to the choices used for inclusion body solubilization, but usually the chaotrope is used at a lower concentration and is not necessarily the same as chaotropes used for the solubilization. In most cases the refolding/oxidation solution will also contain a reducing agent or the reducing agent plus its oxidized form in a specific ratio to generate a particular redox potential allowing for disulfide shuffling to occur in the formation of the protein's cysteine bridge(s). Some of the commonly used redox couples include cysteine/cystamine, glutathione (GSH)/dithiobis GSH, cupric chloride, dithiothreitol(DTT)/dithiane DTT, and 2-mercaptoethanol(bME)/di-thio-b(ME). In many instances, a cosolvent may be used to increase the efficiency of the refolding, and common reagents used for this purpose include glycerol, polyethylene glycol of various molecular weights, arginine and the like.

Compositions

[00132] Disclosed herein are compositions comprising an immunoglobulin fusion protein and/or component of an immunoglobulin fusion protein disclosed herein. The compositions may comprise 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more immunoglobulin fusion proteins. The

immunoglobulin fusion proteins may be different. Alternatively, the immunoglobulin fusion proteins may be the same or similar. The immunoglobulin fusion proteins may comprise different immunoglobulin regions, therapeutic peptides or a combination thereof.

[00133] The compositions may further comprise one or more pharmaceutically acceptable salts, excipients or vehicles. Pharmaceutically acceptable salts, excipients, or vehicles for use in the present pharmaceutical compositions include carriers, excipients, diluents, antioxidants, preservatives, coloring, flavoring and diluting agents, emulsifying agents, suspending agents, solvents, fillers, bulking agents, buffers, delivery vehicles, tonicity agents, cosolvents, wetting agents, complexing agents, buffering agents, antimicrobials, and surfactants.

[00134] Neutral buffered saline or saline mixed with serum albumin are exemplary appropriate carriers. The pharmaceutical compositions may include antioxidants such as ascorbic acid; low molecular weight polypeptides; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyrrolidone; amino acids such as glycine, glutamine, asparagine, arginine or lysine; monosaccharides, disaccharides, and other carbohydrates including glucose, mannose, or dextrins; chelating agents such as EDTA; sugar alcohols such as mannitol or sorbitol; salt-forming counterions such as sodium; and/or nonionic surfactants such as Tween, pluronics, or polyethylene glycol (PEG). Also by way of example, suitable tonicity enhancing agents include alkali metal halides (preferably sodium or potassium chloride), mannitol, sorbitol, and the like. Suitable preservatives include benzalkonium chloride, thimerosal, phenethyl alcohol, methylparaben, propylparaben, chlorhexidine, sorbic acid and the like. Hydrogen peroxide also may be used as preservative. Suitable cosolvents include glycerin, propylene glycol, and PEG. Suitable complexing agents include caffeine, polyvinylpyrrolidone, beta-cyclodextrin or hydroxy-propyl-beta-cyclodextrin. Suitable surfactants or wetting agents include sorbitan esters, polysorbates such as polysorbate 80, tromethamine, lecithin, cholesterol, tyloxapal, and the like. The buffers may be conventional buffers such as acetate, borate, citrate, phosphate, bicarbonate, or Tris-HCl. Acetate buffer may be about pH 4-5.5, and Tris buffer may be about pH 7-8.5. Additional pharmaceutical agents are set forth in Remington's

Pharmaceutical Sciences, 18th Edition, A. R. Gennaro, ed., Mack Publishing Company, 1990.

[00135] The composition may be in liquid form or in a lyophilized or freeze-dried form and may include one or more lyoprotectants, excipients, surfactants, high molecular weight structural additives and/or bulking agents (see, for example, U.S. Patent Nos. 6,685,940, 6,566,329, and 6,372,716). In one embodiment, a lyoprotectant is included, which is a non- reducing sugar such as sucrose, lactose or trehalose. The amount of lyoprotectant generally included is such that, upon reconstitution, the resulting formulation will be isotonic, although hypertonic or slightly hypotonic formulations also may be suitable. In addition, the amount of lyoprotectant should be sufficient to prevent an unacceptable amount of degradation and/or aggregation of the protein upon lyophilization. Exemplary lyoprotectant concentrations for sugars (e.g., sucrose, lactose, trehalose) in the pre-lyophilized formulation are from about 10 mM to about 400 mM. In another embodiment, a surfactant is included, such as for example, nonionic surfactants and ionic surfactants such as polysorbates (e.g., polysorbate 20, polysorbate 80); poloxamers (e.g., poloxamer 188); poly(ethylene glycol) phenyl ethers (e.g., Triton);

sodium dodecyl sulfate (SDS); sodium laurel sulfate; sodium octyl glycoside; lauryl-, myristyl-, linoleyl-, or stearyl-sulfobetaine; lauryl-, myristyl-, linoleyl-or stearyl-sarcosine; linoleyl, myristyl-, or cetyl-betaine; lauroamidopropyl-, cocamidopropyl-, linoleamidopropyl-, myristamidopropyl-, palmidopropyl-, or isostearamidopropyl-betaine (e.g., lauroamidopropyl); myristamidopropyl-, palmidopropyl-, or isostearamidopropyl-dimethylamine; sodium methyl cocoyl-, or disodium methyl ofeyl-taurate; the MONAQUAT™ series (Mona Industries, Inc., Paterson, N.J.), polyethyl glycol, polypropyl glycol, and copolymers of ethylene and propylene glycol (e.g., Pluronics, PF68 etc). Exemplary amounts of surfactant that may be present in the pre-lyophilized formulation are from about 0.001 -0.5%. High molecular weight structural additives (e.g., fillers, binders) may include for example, acacia, albumin, alginic acid, calcium phosphate (dibasic), cellulose, carboxymethylcellulose, carboxymethylcellulose sodium, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, microcrystalline cellulose, dextran, dextrin, dextrates, sucrose, tylose, pregelatinized starch, calcium sulfate, amylose, glycine, bentonite, maltose, sorbitol, ethylcellulose, disodium hydrogen phosphate, disodium phosphate, disodium pyrosulfite, polyvinyl alcohol, gelatin, glucose, guar gum, liquid glucose, compressible sugar, magnesium aluminum silicate, maltodextrin, polyethylene oxide, polymethacrylates, povidone, sodium alginate, tragacanth microcrystalline cellulose, starch, and zein. Exemplary concentrations of high molecular weight structural additives are from 0.1% to 10%) by weight. In other embodiments, a bulking agent (e.g., mannitol, glycine) may be included.

[00136] Compositions may be suitable for parenteral administration. Exemplary compositions are suitable for injection or infusion into an animal by any route available to the skilled worker, such as intraarticular, subcutaneous, intravenous, intramuscular, intraperitoneal, intracerebral (intraparenchymal), intracerebroventricular, intramuscular, intraocular, intraarterial, or intralesional routes. A parenteral formulation typically will be a sterile, pyrogen-free, isotonic aqueous solution, optionally containing pharmaceutically acceptable preservatives.

[00137] Examples of non-aqueous solvents are propylene glycol, polyethylene glycol, vegetable oils such as olive oil, and injectable organic esters such as ethyl oleate. Aqueous carriers include water, alcoholic/aqueous solutions, emulsions or suspensions, including saline and buffered media. Parenteral vehicles include sodium chloride solution, Ringers' dextrose, dextrose and sodium chloride, lactated Ringer's, or fixed oils. Intravenous vehicles include fluid and nutrient replenishers, electrolyte replenishers, such as those based on Ringer's dextrose, and the like. Preservatives and other additives may also be present, such as, for example, antimicrobials, anti-oxidants, chelating agents, inert gases and the like. See generally, Remington's Pharmaceutical Science, 16th Ed., Mack Eds., 1980.

[00138] Compositions described herein may be formulated for controlled or sustained delivery in a manner that provides local concentration of the product (e.g., bolus, depot effect) and/or increased stability or half-life in a particular local environment. The compositions may comprise the formulation of immunoglobulin fusion proteins, polypeptides, nucleic acids, or vectors disclosed herein with particulate preparations of polymeric compounds such as polylactic acid, polyglycolic acid, etc., as well as agents such as a biodegradable matrix, injectable microspheres, microcapsular particles, microcapsules, bioerodible particles beads, liposomes, and implantable delivery devices that provide for the controlled or sustained release of the active agent which then may be delivered as a depot injection. Techniques for formulating such sustained-or controlled-delivery means are known and a variety of polymers have been developed and used for the controlled release and delivery of drugs. Such polymers are typically biodegradable and biocompatible. Polymer hydrogels, including those formed by complexation of enantiomeric polymer or polypeptide segments, and hydrogels with temperature or pH sensitive properties, may be desirable for providing drug depot effect because of the mild and aqueous conditions involved in trapping bioactive protein agents. See, for example, the description of controlled release porous polymeric microparticles for the delivery of

pharmaceutical compositions in WO 93/15722.

[00139] Suitable materials for this purpose include polylactides (see, e.g., U.S. Patent No.

3,773,919), polymers of poly-(a-hydroxycarboxylic acids), such as poly-D-(-)-3-hydroxybutyric acid (EP 133,988A), copolymers of L-glutamic acid and gamma ethyl -L-glutamate (Sidman et al., Biopolymers, 22: 547-556 (1983)), poly(2-hydroxyethyl-methacrylate) (Langer et al., J. Biomed. Mater. Res., 15: 167-277 (1981), and Langer, Chem. Tech., 12: 98-105 (1982)), ethylene vinyl acetate, or poly-D(-)-3-hydroxybutyric acid. Other biodegradable polymers include poly(lactones), poly(acetals), poly(orthoesters), and poly(orthocarbonates). Sustained- release compositions also may include liposomes, which may be prepared by any of several methods known in the art (see, e.g., Eppstein et al, Proc. Natl. Acad. Sci. USA, 82: 3688-92 (1985)). The carrier itself, or its degradation products, should be nontoxic in the target tissue and should not further aggravate the condition. This may be determined by routine screening in animal models of the target disorder or, if such models are unavailable, in normal animals.

[00140] The immunoglobulin fusion proteins disclosed herein may be microencapsulated.

[00141] A pharmaceutical composition disclosed herein can be administered to a subject by any suitable administration route, including but not limited to, parenteral (intravenous, subcutaneous, intraperitoneal, intramuscular, intravascular, intrathecal, intravitreal, infusion, or local), topical, oral, or nasal administration.

[00142] Formulations suitable for intramuscular, subcutaneous, peritumoral, or intravenous injection can include physiologically acceptable sterile aqueous or non-aqueous solutions, dispersions, suspensions or emulsions, and sterile powders for reconstitution into sterile injectable solutions or dispersions. Examples of suitable aqueous and non-aqueous carriers, diluents, solvents, or vehicles including water, ethanol, polyols (propyleneglycol, polyethylene- glycol, glycerol, cremophor and the like), suitable mixtures thereof, vegetable oils (such as olive oil) and injectable organic esters such as ethyl oleate. Proper fluidity is maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersions, and by the use of surfactants. Formulations suitable for subcutaneous injection also contain optional additives such as preserving, wetting, emulsifying, and dispensing agents.

[00143] For intravenous injections, an active agent can be optionally formulated in aqueous solutions, preferably in physiologically compatible buffers such as Hank's solution, Ringer's solution, or physiological saline buffer.

[00144] Parenteral injections optionally involve bolus injection or continuous infusion.

Formulations for injection are optionally presented in unit dosage form, e.g., in ampoules or in multi dose containers, with an added preservative. The pharmaceutical composition described herein can be in a form suitable for parenteral injection as a sterile suspensions, solutions or emulsions in oily or aqueous vehicles, and contain formulatory agents such as suspending, stabilizing and/or dispersing agents. Pharmaceutical formulations for parenteral administration include aqueous solutions of an active agent in water soluble form. Additionally, suspensions are optionally prepared as appropriate oily injection suspensions.

[00145] Alternatively or additionally, the compositions may be administered locally via implantation into the affected area of a membrane, sponge, or other appropriate material on to which an immunoglobulin fusion protein disclosed herein has been absorbed or encapsulated. Where an implantation device is used, the device may be implanted into any suitable tissue or organ, and delivery of an immunoglobulin fusion protein, nucleic acid, or vector disclosed herein may be directly through the device via bolus, or via continuous administration, or via catheter using continuous infusion.

[00146] A pharmaceutical composition comprising an immunoglobulin fusion protein disclosed herein may be formulated for inhalation, such as for example, as a dry powder. Inhalation solutions also may be formulated in a liquefied propellant for aerosol delivery. In yet another formulation, solutions may be nebulized. Additional pharmaceutical composition for pulmonary administration include, those described, for example, in WO 94/20069, which discloses pulmonary delivery of chemically modified proteins. For pulmonary delivery, the particle size should be suitable for delivery to the distal lung. For example, the particle size may be from 1 μπι to 5 μπι; however, larger particles may be used, for example, if each particle is fairly porous.

[00147] Certain formulations comprising an immunoglobulin fusion protein disclosed herein may be administered orally. Formulations administered in this fashion may be formulated with or without those carriers customarily used in the compounding of solid dosage forms such as tablets and capsules. For example, a capsule may be designed to release the active portion of the formulation at the point in the gastrointestinal tract when bioavailability is maximized and pre- systemic degradation is minimized. Additional agents may be included to facilitate absorption of a selective binding agent. Diluents, flavorings, low melting point waxes, vegetable oils, lubricants, suspending agents, tablet disintegrating agents, and binders also may be employed.

[00148] Another preparation may involve an effective quantity of an immunoglobulin fusion protein in a mixture with non-toxic excipients which are suitable for the manufacture of tablets. By dissolving the tablets in sterile water, or another appropriate vehicle, solutions may be prepared in unit dose form. Suitable excipients include, but are not limited to, inert diluents, such as calcium carbonate, sodium carbonate or bicarbonate, lactose, or calcium phosphate; or binding agents, such as starch, gelatin, or acacia; or lubricating agents such as magnesium stearate, stearic acid, or talc.

[00149] Suitable and/or preferred pharmaceutical formulations may be determined in view of the present disclosure and general knowledge of formulation technology, depending upon the intended route of administration, delivery format, and desired dosage. Regardless of the manner of administration, an effective dose may be calculated according to patient body weight, body surface area, or organ size.

[00150] Further refinement of the calculations for determining the appropriate dosage for treatment involving each of the formulations described herein are routinely made in the art and is within the ambit of tasks routinely performed in the art. Appropriate dosages may be ascertained through use of appropriate dose-response data.

[00151] The compositions disclosed herein may be useful for providing prognostic or providing diagnostic information.

[00152] "Pharmaceutically acceptable" may refer to approved or approvable by a regulatory agency of the Federal or a state government or listed in the U.S. Pharmacopeia or other generally recognized pharmacopeia for use in animals, including humans.

[00153] "Pharmaceutically acceptable salt" may refer to a salt of a compound that is pharmaceutically acceptable and that possesses the desired pharmacological activity of the parent compound.

[00154] "Pharmaceutically acceptable excipient, carrier or adjuvant" may refer to an excipient, carrier or adjuvant that may be administered to a subject, together with at least one

immunoglobulin of the present disclosure, and which does not destroy the pharmacological activity thereof and is nontoxic when administered in doses sufficient to deliver a therapeutic amount of the compound.

[00155] "Pharmaceutically acceptable vehicle" may refer to a diluent, adjuvant, excipient, or carrier with which at least one immunoglobulin of the present disclosure is administered. Kits

[00156] Further disclosed herein are kits which comprise one or more immunoglobulin fusion proteins or components thereof. The immunoglobulin fusion proteins may be packaged in a manner which facilitates their use to practice methods of the present disclosure. For example, a kit comprises an immunoglobulin fusion protein described herein packaged in a container with a label affixed to the container or a package insert that describes use of the immunoglobulin fusion protein in practicing the method. Suitable containers include, for example, bottles, vials, syringes, etc. The containers may be formed from a variety of materials such as glass or plastic. The container may have a sterile access port (for example the container may be an intravenous solution bag or a vial having a stopper pierceable by a hypodermic injection needle). The kit may comprise a container with an immunoglobulin fusion protein contained therein. The kit may comprise a container with (a) an immunoglobulin region of an immunoglobulin fusion protein. The kit may further comprise a package insert indicating that the first and second compositions may be used to treat a particular condition. Alternatively, or additionally, the kit may further comprise a second (or third) container comprising a pharmaceutically-acceptable buffer (e.g., bacteriostatic water for injection (BWFI), phosphate-buffered saline, Ringer's solution and dextrose solution). It may further comprise other materials desirable from a commercial and user standpoint, including, but not limited to, other buffers, diluents, filters, needles, and syringes. The immunoglobulin fusion protein may be packaged in a unit dosage form. The kit may further comprise a device suitable for administering the immunoglobulin fusion protein according to a specific route of administration or for practicing a screening assay. The kit may contain a label that describes use of the immunoglobulin fusion protein composition.

[00157] The composition comprising the immunoglobulin fusion protein may be formulated in accordance with routine procedures as a pharmaceutical composition adapted for intravenous administration to mammals, such as humans, bovines, felines, canines, and murines. Typically, compositions for intravenous administration comprise solutions in sterile isotonic aqueous buffer. Where necessary, the composition may also include a solubilizing agent and/or a local anaesthetics such as lignocaine to ease pain at the site of the injection. Generally, the ingredients may be supplied either separately or mixed together in unit dosage form. For example, the immunoglobulin fusion protein may be supplied as a dry lyophilized powder or water free concentrate in a hermetically sealed container such as an ampoule or sachette indicating the quantity of the immunoglobulin fusion protein. Where the composition is to be administered by infusion, it may be dispensed with an infusion bottle containing sterile pharmaceutical grade water or saline. Where the composition is administered by injection, an ampoule of sterile water for injection or saline may be provided so that the ingredients may be mixed prior to administration.

[00158] The amount of the composition described herein which will be effective in the treatment, inhibition and/or prevention of a disease or disorder associated with aberrant expression and/or activity of a therapeutic peptide may be determined by standard clinical techniques. In addition, in vitro assays may optionally be employed to help identify optimal dosage ranges. The precise dose to be employed in the formulation may also depend on the route of administration, and the seriousness of the disease or disorder, and should be decided according to the judgment of the practitioner and each patient's circumstances. Effective doses may be extrapolated from dose-response curves derived from in vitro, animal model test systems or clinical trials.

Therapeutic Use

[00159] Further disclosed herein are immunoglobulin fusion proteins for use in methods of treating, alleviating, inhibiting and/or preventing one or more diseases and/or conditions. The method may comprise administering to a subject in need thereof a composition comprising one or more immunoglobulin fusion proteins disclosed herein. The immunoglobulin fusion protein may comprise an immunoglobulin region attached to a therapeutic peptide. In some

embodiments, the therapeutic peptide is attached the amino terminus of the immunoglobulin region. The immunoglobulin fusion protein may comprise an immunoglobulin region attached to a non-immunoglobulin region. The composition may further comprise a pharmaceutically acceptable carrier. The subject may be a mammal. The mammal may be a human. Alternatively, the mammal is a bovine. The therapeutic peptide may be a peptide or derivative or variant thereof. Alternatively, therapeutic peptide is a small molecule. The therapeutic peptide may be relaxin or derivative or variant thereof. The immunoglobulin region may comprise one or more immunoglobulin domains. The immunoglobulin region may be an immunoglobulin A, an immunoglobulin D, an immunoglobulin E, an immunoglobulin G, or an immunoglobulin M. The immunoglobulin region may be an immunoglobulin heavy chain region or fragment thereof. In some instances, the immunoglobulin region is from a mammalian immunoglobulin.

Alternatively, the immunoglobulin region is from a chimeric immunoglobulin. The

immunoglobulin region may be from an engineered immunoglobulin or recombinant

immunoglobulin. The immunoglobulin region may be from a humanized, human engineered or fully human immunoglobulin. The mammalian immunoglobulin may be a bovine

immunoglobulin. The mammalian immunoglobulin may be a human immunoglobulin. In other instances, the mammalian immunoglobulin is a murine immunoglobulin. The immunoglobulin fusion protein, immunoglobulin region, and/or therapeutic peptide may further comprise one or more linkers. The linker may attach a proteolytic cleavage site to the immunoglobulin region or therapeutic peptide. The linker may be a connecting linker. The connecting linker may connect the therapeutic peptide to the amino terminus of the immunoglobulin region.

[00160] Further disclosed herein are immunoglobulin fusion proteins for use in methods of treating, alleviating, inhibiting and/or preventing one or more diseases and/or conditions. The method may comprise administering to a subject in need thereof a composition comprising one or more immunoglobulin fusion proteins disclosed herein. The immunoglobulin fusion protein may comprise an immunoglobulin region comprising a Palivizumab attached to a relaxin peptide, wherein the therapeutic peptide is attached the amino terminus of the immunoglobulin region. The immunoglobulin fusion protein may comprise a heavy chain fusion with an amino acid sequence selected from SEQ ID NO: 20 and 22 and a light chain with an amino acid sequence selected from SEQ ID NO: 10-12. The immunoglobulin fusion protein may comprise a heavy chain fusion with an amino acid sequence at least 70% identical to SEQ ID NO: 22 and a light chain with an amino acid sequence at least 70% identical to SEQ ID NO: 12. The immunoglobulin fusion protein may comprise a heavy chain fusion with an amino acid sequence at least 90% identical to SEQ ID NO: 22 and a light chain with an amino acid sequence at least 90% identical to SEQ ID NO: 12. The immunoglobulin fusion protein may comprise a heavy chain fusion with an amino acid sequence at least 95% identical to SEQ ID NO: 22 and a light chain with an amino acid sequence at least 95% identical to SEQ ID NO: 12. The

immunoglobulin fusion protein may comprise a heavy chain fusion with an amino acid sequence at least 99% identical to SEQ ID NO: 22 and a light chain with an amino acid sequence at least 99% identical to SEQ ID NO: 12. The composition may further comprise a pharmaceutically acceptable carrier. The subject may be a mammal. The mammal may be a human. Alternatively, the mammal is a bovine.

[00161] The disease or condition may be an autoimmune disease, heteroimmune disease or condition, inflammatory disease, pathogenic infection, thromboembolic disorder, respiratory disease or condition, metabolic disease, central nervous system (CNS) disorder, bone disease or cancer. In other instances, the disease or condition is a blood disorder. In some instances, the disease or condition is obesity, diabetes, osteoporosis, anemia, or pain. In some instances, the disease is heart related, for example, heart failure, acute coronary syndrome, atrial fibrillation, cardiac fibrosis, or coronary artery disease. In some embodiments, the heart failure is nonischemic acute heart failure, chronic heart failure, acute decompensated heart failure, stable compensated heart failure, acute heart failure, or chronic heart failure. Additional non-limiting examples of disease and conditions include, ischemia reperfusion associated with solid organ transplant (e.g., lung, kidney, liver, heart), cardiopulmonary bypass for organ protection (e.g., renal), ischemic stroke, corneal healing (ocular administration), diabetic nephropathy, cirrhosis, portal hypertension, diabetic would healing, systemic sclerosis, cervical ripening at time of labor, preeclampsia, portal hypertension, and fibrosis.

[00162] In some embodiments, the therapeutic peptide is exendin-4 and the disease or condition is obesity, obesity related conditions, diabetes, and/or diabetes related conditions. In some embodiments, the therapeutic peptide is leptin and the disease or condition is obesity, obesity related conditions, diabetes, and/or diabetes related conditions. In some embodiments, the therapeutic peptide is glucagon and the disease or condition is obesity, obesity related conditions, diabetes, and/or diabetes related conditions. In some embodiments, the therapeutic peptide is a glucagon analog, for example ZP1, and the disease or condition is obesity, obesity related conditions, diabetes, and/or diabetes related conditions. In some embodiments, the therapeutic peptide is insulin, and the disease or condition is obesity, obesity related conditions, diabetes, and/or diabetes related conditions. In some embodiments, the therapeutic peptide is oxyntomodulin, and the disease or condition is obesity, obesity related conditions, diabetes, and/or diabetes related conditions. In some embodiments, the therapeutic peptide is a glucagon like protein, for example GLP-1 or GLP-2, and the disease or condition is obesity, obesity related conditions, diabetes, and/or diabetes related conditions.

[00163] In some embodiments, the therapeutic peptide is relaxin and the disease or condition is heart failure, heart failure related conditions, fibrosis, fibrosis related conditions, or other disease. Relaxin includes relaxin2 and relaxins comprising internal linkers such as relaxin2 (XT 100), relaxin2 (XT35), relaxin2 (single), relaxin2 (insulin C peptide), relaxin2 (XT21), relaxin2 (30GS), relaxin2 (9GS), and relaxin2 (GGGPRR). In some embodiments, the therapeutic peptide is relaxin and the disease or condition is heart failure, acute coronary syndrome, atrial fibrillation, cardiac fibrosis, or coronary artery disease. In some embodiments, the therapeutic peptide is relaxin and the disease or condition is ischemia reperfusion associated with solid organ transplant (e.g., lung, kidney, liver, heart), cardiopulmonary bypass for organ protection (e.g., renal), ischemic stroke, corneal healing (ocular administration), diabetic nephropathy, cirrhosis, portal hypertension, diabetic would healing, systemic sclerosis, cervical ripening at time of labor, preeclampsia, portal hypertension, or fibrosis. In some embodiments, heart failure may comprise one or more of acute decompensated heart failure, right heart failure, left heart failure, global failure, ischemic cardiomyopathy, dilated cardiomyopathy, heart failure associated with congenital heart defects, heart failure associated with heart valve defects, mitral stenosis, mitral insufficiency, aortic stenosis, aortic insufficiency, tricuspid stenosis, tricuspid insufficiency, pulmonary stenosis, pulmonary valve insufficiency, heart failure associated with combined heart valve defects, myocardial inflammation (myocarditis), chronic myocarditis, acute myocarditis, viral myocarditis, diabetic heart failure, alcoholic cardiomyopathy, heart failure associated with cardiac storage disorders, diastolic heart failure, and systolic heart failure. In some embodiments, the therapeutic peptide is relaxin and the disease or condition is cardiovascular disease, lung disease, fibrotic disease, kidney disease, pancreatitis, inflammation, cancer, scleroderma, pulmonary fibrosis, renal fibrosis, hepatic fibrosis, fibrosis of the lung, heart, kidney, bone marrow, liver, dermatological fibrosis, fibrotic eye disorder, ischemia, Alzheimer's disease, corneal injury, neurodegenerative disease, cardiovascular disease, fibrotic disease, failure, pancreatitis, inflammation, cancer, scleroderma, pulmonary fibrosis, renal fibrosis, hepatic fibrosis, thromboembolic disorders, reperfusion damage following ischemia, micro- and macrovascular lesions (vasculitis), arterial and venous thromboses, edemas, ischemias, myocardial infarction, stroke, transient ischemic attack, cardio protection in connection with coronary artery bypass operations, cardio protection in connection with primary percutaneous transluminal coronary angioplasties (PTCAs), PTCAs after thrombolysis, rescue PTCA, heart transplants and open-heart operations, organ protection in connection with transplants, bypass operations, catheter examinations and other surgical procedures, respiratory disorders, chronic obstructive pulmonary disease, chronic bronchitis, interstitial lung disease, asthma, pulmonary emphysema, bronchiectases, cystic fibrosis (mucoviscidosis) and pulmonary hypertension, in particular pulmonary arterial hypertension, kidney disease, acute and chronic kidney diseases and acute and chronic renal insufficiencies, as well as acute and chronic renal failure with or without the requirement of dialysis, underlying or related kidney diseases, renal hypoperfusion, dialysis induced hypotension, glomerulopathies, glomerular and tubular proteinuria, renal edema, hematuria, chronic glomerulonephritis (including primary, secondary, or acute), membranous and membranoproliferative glomerulonephritis, Alport-Syndrome, glomerulosclerosis, interstistial tubular diseases, nephropathic diseases, primary and inborn kidney diseases, renal inflammation, immunological renal diseases, renal transplant rejection, immune complex induced renal diseases, intoxication induced nephropathic diseases, diabetic and non-diabetic renal diseases, pyelonephritis, cystic kidneys, nephrosclerosis, hypertensive nephrosclerosis, nephrotic syndrome, diseases that are characterized and diagnostically associated with an abnormal reduction in creatinine clearance and/or water excretion, abnormal increased blood concentrations of urea, nitrogen, potassium and/or creatinine, alteration in the activity of renal enzymes including without limitation glutamylsynthetase, urine osmolality and urine volume, increased microalbuminuria, macroalbuminuria, glomerular and arteriolar lesions, tubular dilation, hyperphosphatemia, disease requiring dialysis for treatment, renal carcinomas, after incomplete resection of the kidney, dehydration after overuse of diuretics, uncontrolled blood pressure increase with malignant hypertension, urinary tract obstruction and infection, amyloidosis, systemic diseases associated with glomerular damage, Lupus erythematosus, rheumatic immunological systemic diseases, renal artery stenosis, renal artery thrombosis, renal vein thrombosis, analgetics induced nephropathy, polycystic kidney disease, renal tubular acidosis, contrast medium induced and drug induced acute and chronic interstitial kidney diseases, metabolic syndrome, dyslipemia, aftereffects associated with acute and/or chronic kidney diseases, pulmonary edema, heart failure, uremia, anemia, electrolyte disturbances, hyperkalemia, hyponatremia, bony and carbohydrate metabolism, lung diseases, asthmatic disorders, pulmonary arterial hypertension (PAH), pulmonary hypertension (PH), left-heart disease, HIV, sickle cell anemia, thromboembolisms (CTEPH), sarcoidosis, COPD-associated pulmonary hypertension, pulmonary fibrosis-associated pulmonary hypertension, chronic obstructive pulmonary disease (COPD), acute respiratory distress syndrome (ARDS), acute lung injury (ALI), alpha- 1 -antitrypsin deficiency (AATD), pulmonary fibrosis, pulmonary emphysema, pulmonary emphysema induced by cigarette smoke, cystic fibrosis (CF), fibrotic disorders, fibrotic disorders of the internal organs, fibrotic disorders of the lung, fibrotic disorders of the heart, fibrotic disorders of the kidney, fibrotic disorders of the bone marrow fibrotic disorders of the liver, dermatological fibroses, fibrotic eye disorders, osteodegenerative joint dysfunction, angiotensin-II (Angll)-mediated vasoconstriction, endothelin-1 (ET-1)- mediated vasoconstriction, ischemic conditions, ischemia associated with myocardial infarct ischemia associated with wounds, renal pathologies, renal pathologies related to

vasoconstriction, hypertension, atherosclerosis, Type 1 diabetes, Type 2 diabetes, coronary artery disease, scleroderma, stroke, diastolic dysfunction, familial hypercholesterolemia, isolated systolic hypertension, primary hypertension, secondary hypertension, left ventricular hypertrophy, arterial stiffness associated with long-term tobacco smoking, arterial stiffness associated with obesity, arterial stiffness associated with age, systemic lupus erythematosus, preeclampsia, or hypercholesterolemia.

[00164] The disease and/or condition may be a chronic disease or condition. Alternatively, the disease and/or condition is an acute disease or condition. The disease or condition may be recurrent, refractory, accelerated, or in remission. The disease or condition may affect one or more cell types. The one or more diseases and/or conditions may be an autoimmune disease, inflammatory disease, cardiovascular disease, metabolic disorder, pregnancy, and cell proliferative disorder.

[00165] The disease or condition may be an autoimmune disease. In some cases, the autoimmune disease may be scleroderma, diffuse scleroderma or systemic scleroderma. [00166] The disease or condition may be an inflammatory disease. In some cases, the inflammatory disease may be hepatitis, fibromyalgia or psoriasis.

[00167] The disease or condition may be a rheumatic disease. In some cases, the rheumatic disease may be Ankylosing spondylitis, back pain, bursitis, tendinitis, shoulder pain, wrist pain, bicep pain, leg pain, knee pain, ankle pain, hip pain, Achilles pain, Capsulitis, neck pain, osteoarthritis, systemic lupus, erythematosus, rheumatoid arthritis, juvenile arthritis, Sjogren syndrome, Polymyositis, Behcet's disease, Reiter's syndrome, or Psoriatic arthritis. The rheumatic disease may be chronic. Alternatively, the rheumatic disease is acute.

[00168] The disease or condition may be a cardiovascular disease. In some cases, the cardiovascular disease may be acute heart failure, congestive heart failure, compensated heart failure, decompensated heart failure, hypercholesterolemia, atherosclerosis, coronary heart disease or ischemic stroke. The cardiovascular disease may be cardiac hypertrophy.

[00169] The disease or condition may be a metabolic disorder. In some cases, the metabolic disorder may be hypercholesterolemia, hypobetalipoproteinemia, hypertriglyceridemia, hyperlipidemia, dyslipidemia, ketosis, hypolipidemia, refractory anemia, appetite control, gastric emptying, non-alcoholic fatty liver disease, obesity, type I diabetes mellitus, type II diabetes mellitus, gestational diabetes mellitus, metabolic syndrome. The metabolic disorder may be type I diabetes. The metabolic disorder may be type II diabetes.

[00170] The disease or condition may be pregnancy. The immunoglobulin fusion proteins may be used to treat preeclampsia or induce labor.

[00171] Disclosed herein are methods of treating a disease or condition in a subject in need thereof, the method comprising administering to the subject a composition comprising an immunoglobulin fusion protein disclosed herein. In some embodiments, the immunoglobulin fusion protein comprises a therapeutic peptide attached to an immunoglobulin region. In some embodiments, the therapeutic peptide is attached to the immunoglobulin region via a chemical linker referred to as a connecting peptide. In some embodiments, the therapeutic peptide is attached to the amino terminus of the immunoglobulin region. In some embodiments, the therapeutic peptide is relaxin. In some embodiments, the immunoglobulin fusion protein comprises an immunoglobulin region comprising a Palivizumab attached to a relaxin peptide, wherein the therapeutic peptide is attached the amino terminus of the immunoglobulin region. In some embodiments, the immunoglobulin fusion protein comprises a heavy chain fusion with an amino acid sequence selected from SEQ ID NO: 20 and 22 and a light chain with an amino acid sequence selected from SEQ ID NO: 10-12. In some embodiments, the immunoglobulin fusion protein comprises a heavy chain fusion with an amino acid sequence at least 70% identical to SEQ ID NO: 22 and a light chain with an amino acid sequence at least 70% identical to SEQ ID NO: 12. In some embodiments, the immunoglobulin fusion protein comprises a heavy chain fusion with an amino acid sequence at least 90% identical to SEQ ID NO: 22 and a light chain with an amino acid sequence at least 90% identical to SEQ ID NO: 12. In some embodiments, the immunoglobulin fusion protein comprises a heavy chain fusion with an amino acid sequence at least 95% identical to SEQ ID NO: 22 and a light chain with an amino acid sequence at least 95% identical to SEQ ID NO: 12. In some embodiments, the immunoglobulin fusion protein comprises a heavy chain fusion with an amino acid sequence at least 99% identical to SEQ ID NO: 22 and a light chain with an amino acid sequence at least 99% identical to SEQ ID NO: 12. The disease or condition may be a cardiovascular disease. The

cardiovascular disease may be acute heart failure. Additional cardiovascular diseases include, but are not limited to, congestive heart failure, compensated heart failure or decompensated heart failure. The disease or condition may be an autoimmune disorder. The autoimmune disorder may be scleroderma, diffuse scleroderma or systemic scleroderma. The disease or condition may be an inflammatory disease. The inflammatory disease may be fibromyalgia. The disease or condition may be fibrosis. Alternatively, the disease or condition is pregnancy. The immunoglobulin fusion protein may be used to treat preeclampsia or induce labor. In some embodiments, heart failure may comprise one or more of acute decompensated heart failure, right heart failure, left heart failure, global failure, ischemic cardiomyopathy, dilated

cardiomyopathy, heart failure associated with congenital heart defects, heart failure associated with heart valve defects, mitral stenosis, mitral insufficiency, aortic stenosis, aortic

insufficiency, tricuspid stenosis, tricuspid insufficiency, pulmonary stenosis, pulmonary valve insufficiency, heart failure associated with combined heart valve defects, myocardial inflammation (myocarditis), chronic myocarditis, acute myocarditis, viral myocarditis, diabetic heart failure, alcoholic cardiomyopathy, heart failure associated with cardiac storage disorders, diastolic heart failure, and systolic heart failure. In some embodiments, the immunoglobulin fusion protein may be used to treat a disease selected from the group consisting of

cardiovascular disease, lung disease, fibrotic disease, kidney disease, pancreatitis, inflammation, cancer, scleroderma, pulmonary fibrosis, renal fibrosis, hepatic fibrosis, fibrosis of the lung, heart, kidney, bone marrow, liver, dermatological fibrosis, fibrotic eye disorder, ischemia, Alzheimer's disease, corneal injury, neurodegenerative disease, cardiovascular disease, fibrotic disease, failure, pancreatitis, inflammation, cancer, scleroderma, pulmonary fibrosis, renal fibrosis, hepatic fibrosis, thromboembolic disorders, reperfusion damage following ischemia, micro- and macrovascular lesions (vasculitis), arterial and venous thromboses, edemas, ischemias, myocardial infarction, stroke, transient ischemic attack, cardio protection in connection with coronary artery bypass operations, cardio protection in connection with primary percutaneous transluminal coronary angioplasties (PTCAs), PTCAs after thrombolysis, rescue PTCA, heart transplants and open-heart operations, organ protection in connection with transplants, bypass operations, catheter examinations and other surgical procedures, respiratory disorders, chronic obstructive pulmonary disease, chronic bronchitis, interstitial lung disease, asthma, pulmonary emphysema, bronchiectases, cystic fibrosis (mucoviscidosis) and pulmonary hypertension, in particular pulmonary arterial hypertension, kidney disease, acute and chronic kidney diseases and acute and chronic renal insufficiencies, as well as acute and chronic renal failure with or without the requirement of dialysis, underlying or related kidney diseases, renal hypoperfusion, dialysis induced hypotension, glomerulopathies, glomerular and tubular proteinuria, renal edema, hematuria, chronic glomerulonephritis (including primary, secondary, or acute), membranous and membranoproliferative glomerulonephritis, Alport-Syndrome, glomerulosclerosis, interstistial tubular diseases, nephropathic diseases, primary and inborn kidney diseases, renal inflammation, immunological renal diseases, renal transplant rejection, immune complex induced renal diseases, intoxication induced nephropathic diseases, diabetic and non-diabetic renal diseases, pyelonephritis, cystic kidneys, nephrosclerosis, hypertensive nephrosclerosis, nephrotic syndrome, diseases that are characterized and diagnostically associated with an abnormal reduction in creatinine clearance and/or water excretion, abnormal increased blood concentrations of urea, nitrogen, potassium and/or creatinine, alteration in the activity of renal enzymes including without limitation glutamylsynthetase, urine osmolality and urine volume, increased microalbuminuria, macroalbuminuria, glomerular and arteriolar lesions, tubular dilation, hyperphosphatemia, disease requiring dialysis for treatment, renal carcinomas, after incomplete resection of the kidney, dehydration after overuse of diuretics, uncontrolled blood pressure increase with malignant hypertension, urinary tract obstruction and infection, amyloidosis, systemic diseases associated with glomerular damage, Lupus erythematosus, rheumatic immunological systemic diseases, renal artery stenosis, renal artery thrombosis, renal vein thrombosis, analgetics induced nephropathy, polycystic kidney disease, renal tubular acidosis, contrast medium induced and drug induced acute and chronic interstitial kidney diseases, metabolic syndrome, dyslipemia, aftereffects associated with acute and/or chronic kidney diseases, pulmonary edema, heart failure, uremia, anemia, electrolyte disturbances, hyperkalemia, hyponatremia, bony and carbohydrate metabolism, lung diseases, asthmatic disorders, pulmonary arterial hypertension (PAH), pulmonary hypertension (PH), left-heart disease, HIV, sickle cell anemia, thromboembolisms (CTEPH), sarcoidosis, COPD-associated pulmonary hypertension, pulmonary fibrosis-associated pulmonary hypertension, chronic obstructive pulmonary disease (COPD), acute respiratory distress syndrome (ARDS), acute lung injury (ALI), alpha- 1 -antitrypsin deficiency (AATD), pulmonary fibrosis, pulmonary emphysema, pulmonary emphysema induced by cigarette smoke, cystic fibrosis (CF), fibrotic disorders, fibrotic disorders of the internal organs, fibrotic disorders of the lung, fibrotic disorders of the heart, fibrotic disorders of the kidney, fibrotic disorders of the bone marrow fibrotic disorders of the liver, dermatological fibroses, fibrotic eye disorders, osteodegenerative joint dysfunction, angiotensin-II (Angll)-mediated vasoconstriction, endothelin-1 (ET-1)- mediated vasoconstriction, ischemic conditions, ischemia associated with myocardial infarct ischemia associated with wounds, renal pathologies, renal pathologies related to

vasoconstriction, hypertension, atherosclerosis, Type 1 diabetes, Type 2 diabetes, coronary artery disease, scleroderma, stroke, diastolic dysfunction, familial hypercholesterolemia, isolated systolic hypertension, primary hypertension, secondary hypertension, left ventricular hypertrophy, arterial stiffness associated with long-term tobacco smoking, arterial stiffness associated with obesity, arterial stiffness associated with age, systemic lupus erythematosus, preeclampsia, and hypercholesterolemia.

[00172] Disclosed herein may be a method of preventing or treating a disease or condition in a subject in need thereof comprising administering to the subject a composition comprising one or more immunoglobulin fusion proteins disclosed herein. The immunoglobulin fusion protein may comprise an immunoglobulin region attached to therapeutic peptide. The immunoglobulin fusion protein may comprise one or more immunoglobulin heavy chains, light chains, or a combination thereof. The immunoglobulin fusion protein sequence may share 50%, 60%, 70%, 80%, 85%, 90%), 95%), 97%), 99%), or more amino acid sequence identity to a heavy chain sequence provided by SEQ ID NOs: 20-22. The immunoglobulin fusion protein sequence may share 50%, 60%, 70%, 80%, 85%, 90%, 95%, 97%, 99%, or more amino acid sequence identity to a heavy chain sequence provided by SEQ ID NO: 22. The immunoglobulin fusion protein sequence may share 50%, 60%, 70%, 80%, 85%, 90%, 95%, 97%, 99%, or more amino acid sequence identity to a light chain sequence provided by SEQ ID NOs: 9-12. The immunoglobulin fusion protein sequence may share 50%, 60%, 70%, 80%, 85%, 90%, 95%, 97%, 99%, or more amino acid sequence identity to a light chain sequence provided by SEQ ID NO: 12. The immunoglobulin heavy chain may be encoded by a nucleotide sequence that is at least about 50%, 60%>, 70%, 80%, 85%, 90%, 95%, 97%, 99%, or more homologous to SEQ ID NOs: 17-19. The

immunoglobulin heavy chain may be encoded by a nucleotide sequence that is at least about 50%, 60%, 70%, 80%, 85%, 90%, 95%, 97%, 99%, or more homologous to SEQ ID NO: 19. The immunoglobulin light chain may be encoded by a nucleotide sequence that is at least about 50%, 60%, 70%, 80%, 85%, 90%, 95%, 97%, 99%, or more homologous to SEQ ID NOs: 1-4. The immunoglobulin light chain may be encoded by a nucleotide sequence that is at least about 50%, 60%, 70%, 80%, 85%, 90%, 95%, 97%, 99%, or more homologous to SEQ ID NO: 4. The immunoglobulin fusion protein may further comprise one or more linkers. The immunoglobulin fusion protein may further comprise one or more internal linkers. The immunoglobulin fusion protein may further comprise one or more proteolytic cleavage sites. The disease or condition may be an autoimmune disease, heteroimmune disease or condition, inflammatory disease, pathogenic infection, thromboembolic disorder, respiratory disease or condition, metabolic disease, central nervous system (CNS) disorder, bone disease or cancer. The disease or condition may be a blood disorder. In some instances, the disease or condition may be obesity, diabetes, osteoporosis, anemia, or pain. In some embodiments, the disease or condition is heart failure, acute coronary syndrome, atrial fibrillation, cardiac fibrosis, or coronary artery disease. In some embodiments, the disease or condition is ischemia reperfusion associated with solid organ transplant (e.g., lung, kidney, liver, heart), cardiopulmonary bypass for organ protection (e.g., renal), ischemic stroke, corneal healing (ocular administration), diabetic nephropathy, cirrhosis, portal hypertension, diabetic would healing, systemic sclerosis, cervical ripening at time of labor, preeclampsia, portal hypertension, or fibrosis. In some embodiments, the disease or condition may be heart failure. Said heart failure may comprise one or more of acute decompensated heart failure, right heart failure, left heart failure, global failure, ischemic cardiomyopathy, dilated cardiomyopathy, heart failure associated with congenital heart defects, heart failure associated with heart valve defects, mitral stenosis, mitral insufficiency, aortic stenosis, aortic insufficiency, tricuspid stenosis, tricuspid insufficiency, pulmonary stenosis, pulmonary valve insufficiency, heart failure associated with combined heart valve defects, myocardial inflammation (myocarditis), chronic myocarditis, acute myocarditis, viral myocarditis, diabetic heart failure, alcoholic cardiomyopathy, heart failure associated with cardiac storage disorders, diastolic heart failure, and systolic heart failure. In some

embodiments, the disease or condition is cardiovascular disease, lung disease, fibrotic disease, kidney disease, pancreatitis, inflammation, cancer, scleroderma, pulmonary fibrosis, renal fibrosis, hepatic fibrosis, fibrosis of the lung, heart, kidney, bone marrow, liver, dermatological fibrosis, fibrotic eye disorder, ischemia, Alzheimer's disease, corneal injury, neurodegenerative disease, cardiovascular disease, fibrotic disease, failure, pancreatitis, inflammation, cancer, scleroderma, pulmonary fibrosis, renal fibrosis, hepatic fibrosis, thromboembolic disorders, reperfusion damage following ischemia, micro- and macrovascular lesions (vasculitis), arterial and venous thromboses, edemas, ischemias, myocardial infarction, stroke, transient ischemic attack, cardio protection in connection with coronary artery bypass operations, cardio protection in connection with primary percutaneous transluminal coronary angioplasties (PTCAs), PTCAs after thrombolysis, rescue PTCA, heart transplants and open-heart operations, organ protection in connection with transplants, bypass operations, catheter examinations and other surgical procedures, respiratory disorders, chronic obstructive pulmonary disease, chronic bronchitis, interstitial lung disease, asthma, pulmonary emphysema, bronchiectases, cystic fibrosis

(mucoviscidosis) and pulmonary hypertension, in particular pulmonary arterial hypertension, kidney disease, acute and chronic kidney diseases and acute and chronic renal insufficiencies, as well as acute and chronic renal failure with or without the requirement of dialysis, underlying or related kidney diseases, renal hypoperfusion, dialysis induced hypotension, glomerulopathies, glomerular and tubular proteinuria, renal edema, hematuria, chronic glomerulonephritis (including primary, secondary, or acute), membranous and membranoproliferative

glomerulonephritis, Alport- Syndrome, glomerulosclerosis, interstistial tubular diseases, nephropathic diseases, primary and inborn kidney diseases, renal inflammation, immunological renal diseases, renal transplant rejection, immune complex induced renal diseases, intoxication induced nephropathic diseases, diabetic and non-diabetic renal diseases, pyelonephritis, cystic kidneys, nephrosclerosis, hypertensive nephrosclerosis, nephrotic syndrome, diseases that are characterized and diagnostically associated with an abnormal reduction in creatinine clearance and/or water excretion, abnormal increased blood concentrations of urea, nitrogen, potassium and/or creatinine, alteration in the activity of renal enzymes including without limitation glutamyl synthetase, urine osmolarity and urine volume, increased microalbuminuria, macroalbuminuria, glomerular and arteriolar lesions, tubular dilation, hyperphosphatemia, disease requiring dialysis for treatment, renal carcinomas, after incomplete resection of the kidney, dehydration after overuse of diuretics, uncontrolled blood pressure increase with malignant hypertension, urinary tract obstruction and infection, amyloidosis, systemic diseases associated with glomerular damage, Lupus erythematosus, rheumatic immunological systemic diseases, renal artery stenosis, renal artery thrombosis, renal vein thrombosis, analgetics induced nephropathy, polycystic kidney disease, renal tubular acidosis, contrast medium induced and drug induced acute and chronic interstitial kidney diseases, metabolic syndrome, dyslipemia, aftereffects associated with acute and/or chronic kidney diseases, pulmonary edema, heart failure, uremia, anemia, electrolyte disturbances, hyperkalemia, hyponatremia, bony and carbohydrate metabolism, lung diseases, asthmatic disorders, pulmonary arterial hypertension (PAH), pulmonary hypertension (PH), left-heart disease, HIV, sickle cell anemia,

thromboembolisms (CTEPH), sarcoidosis, COPD-associated pulmonary hypertension, pulmonary fibrosis-associated pulmonary hypertension, chronic obstructive pulmonary disease (COPD), acute respiratory distress syndrome (ARDS), acute lung injury (ALI), alpha-1- antitrypsin deficiency (AATD), pulmonary fibrosis, pulmonary emphysema, pulmonary emphysema induced by cigarette smoke, cystic fibrosis (CF), fibrotic disorders, fibrotic disorders of the internal organs, fibrotic disorders of the lung, fibrotic disorders of the heart, fibrotic disorders of the kidney, fibrotic disorders of the bone marrow fibrotic disorders of the liver, dermatological fibroses, fibrotic eye disorders, osteodegenerative joint dysfunction, angiotensin-II (Angll) -mediated vasoconstriction, endothelin-1 (ET-l)-mediated

vasoconstriction, ischemic conditions, ischemia associated with myocardial infarct ischemia associated with wounds, renal pathologies, renal pathologies related to vasoconstriction, hypertension, atherosclerosis, Type 1 diabetes, Type 2 diabetes, coronary artery disease, scleroderma, stroke, diastolic dysfunction, familial hypercholesterolemia, isolated systolic hypertension, primary hypertension, secondary hypertension, left ventricular hypertrophy, arterial stiffness associated with long-term tobacco smoking, arterial stiffness associated with obesity, arterial stiffness associated with age, systemic lupus erythematosus, preeclampsia, or hyper chol e sterol emi a .

[00173] Disclosed herein is a method of preventing or treating heart failure in a subject in need thereof comprising administering to the subject a composition comprising one or more immunoglobulin fusion proteins described herein, wherein the immunoglobulin fusion protein comprises a heavy chain fusion having an amino acid sequence at least 90% identical to SEQ ID NOs: 20 or 22 and a light chain having an amino acid sequence at least 90% identical to SEQ ID NOs: 10-12. In some embodiments, the immunoglobulin fusion protein comprises a heavy chain fusion having an amino acid sequence at least 90% identical to SEQ ID NOs: 22 and a light chain having an amino acid sequence at least 90% identical to SEQ ID NOs: 12. The composition may further comprise a pharmaceutically acceptable carrier. The subject may be a mammal. The mammal may be a human. The heart failure may comprise one or more of acute decompensated heart failure, right heart failure, left heart failure, global failure, ischemic cardiomyopathy, dilated cardiomyopathy, heart failure associated with congenital heart defects, heart failure associated with heart valve defects, mitral stenosis, mitral insufficiency, aortic stenosis, aortic insufficiency, tricuspid stenosis, tricuspid insufficiency, pulmonary stenosis, pulmonary valve insufficiency, heart failure associated with combined heart valve defects, myocardial inflammation (myocarditis), chronic myocarditis, acute myocarditis, viral myocarditis, diabetic heart failure, alcoholic cardiomyopathy, heart failure associated with cardiac storage disorders, diastolic heart failure, and systolic heart failure.

[00174] Provided are methods of treatment, inhibition and prevention of a disease or condition in a subject in need thereof by administration to the subject of an effective amount of an immunoglobulin fusion protein or pharmaceutical composition described herein. The immunoglobulin fusion protein may be substantially purified (e.g., substantially free from substances that limit its effect or produce undesired side-effects). The subject may be an animal, including but not limited to animals such as cows, pigs, sheep, goats, rabbits, horses, chickens, cats, dogs, mice, etc. The subject may be a mammal. The subject may be a human. The subject may be a non -human primate. Alternatively, the subject may be a bovine. The subject may be an avian, reptile or amphibian.

[00175] Methods of treatment disclosed herein comprise administering an immunoglobulin fusion protein comprises an immunoglobulin region comprising a Palivizumab attached to a relaxin peptide, wherein the therapeutic peptide is attached the amino terminus of the immunoglobulin region according to a schedule. In some embodiments, the immunoglobulin fusion protein is administered twice per week. In some embodiments, the immunoglobulin fusion protein is administered once per week. In some embodiments, the immunoglobulin fusion protein is administered once per two weeks. In some embodiments, the immunoglobulin fusion protein is administered four times per month. In some embodiments, the immunoglobulin fusion protein is administered three times per month. In some embodiments, the

immunoglobulin fusion protein is administered once per month. In some embodiments, the immunoglobulin fusion protein is administered in an infusion lasting an indicated amount of time. In some embodiments, the immunoglobulin fusion protein is administered for six hours. In some embodiments, the immunoglobulin fusion protein is administered for five hours. In some embodiments, the immunoglobulin fusion protein is administered for four hours. In some embodiments, the immunoglobulin fusion protein is administered for three hours. In some embodiments, the immunoglobulin fusion protein is administered for two hours. In some embodiments, the immunoglobulin fusion protein is administered for one hour. In some embodiments, the immunoglobulin fusion protein is administered subcutaneously. In some embodiments, the immunoglobulin fusion protein is administered intramuscularly. In some embodiments, the immunoglobulin fusion protein is administered intravenously.

Additional uses

[00176] Further disclosed herein are uses of an immunoglobulin fusion protein in the manufacture of a medicament for the treatment of a disease or condition. The immunoglobulin fusion protein may be any of the immunoglobulin fusion proteins disclosed herein. Disclosed herein is the use of an immunoglobulin fusion protein in the manufacture of a medicament for the treatment of a disease or condition, the immunoglobulin fusion protein comprising an immunoglobulin region attached to a therapeutic peptide. In some embodiments, the therapeutic peptide is attached to the amino terminus of an immunoglobulin region. Further disclosed herein is the use of an immunoglobulin fusion protein in the manufacture of a medicament for the treatment of a disease or condition, the immunoglobulin fusion protein comprising an immunoglobulin region attached to a therapeutic peptide. In some embodiments, the therapeutic peptide is attached to the amino terminus of an immunoglobulin region. The immunoglobulin fusion protein may comprise one or more internal linkers, one or more protease cleavage sites, one or more connecting peptides, and any combination thereof. The one or more internal linkers, one or more protease cleavage sites, and/or one or more connecting peptides may be inserted within the immunoglobulin region. The one or more internal linkers, one or more protease cleavage sites, and/or one or more connecting peptides may be inserted within the therapeutic peptide. The one or more internal linkers, one or more protease cleavage sites, and/or one or more connecting peptides may be connected to the amino terminus of the immunoglobulin region. The immunoglobulin region may comprise one or more

immunoglobulin domains. The immunoglobulin domain may be an immunoglobulin A, an immunoglobulin D, an immunoglobulin E, an immunoglobulin G, or an immunoglobulin M. The immunoglobulin domain may be an immunoglobulin heavy chain region or fragment thereof. The immunoglobulin domain may be an immunoglobulin light chain region or fragment thereof. The immunoglobulin domain may be from an anti-viral, anti-bacterial, antiparasitic, and/or anti-fungal immunoglobulin. In some instances, the immunoglobulin domain is from a mammalian immunoglobulin. Alternatively, the immunoglobulin domain is from a chimeric immunoglobulin. The immunoglobulin domain may be from an engineered

immunoglobulin or recombinant immunoglobulin. The immunoglobulin domain may be from a humanized, human engineered or fully human immunoglobulin. The mammalian

immunoglobulin may be a bovine immunoglobulin. The mammalian immunoglobulin may be a human immunoglobulin. In other instances, the mammalian immunoglobulin is a murine immunoglobulin. The therapeutic peptide may be a peptide or derivative or variant thereof. The therapeutic peptide may comprise relaxin. The disease or condition may be an autoimmune disease, heteroimmune disease or condition, inflammatory disease, pathogenic infection, thromboembolic disorder, respiratory disease or condition, metabolic disease, central nervous system (CNS) disorder, bone disease or cancer. In other instances, the disease or condition is a blood disorder. In some instances, the disease or condition is obesity, diabetes, osteoporosis, anemia, or pain. The disease or condition may be a growth disorder. In some embodiments, the disease or condition is heart failure, acute coronary syndrome, atrial fibrillation, cardiac fibrosis, or coronary artery disease. In some embodiments, the disease or condition is ischemia reperfusion associated with solid organ transplant (e.g., lung, kidney, liver, heart),

cardiopulmonary bypass for organ protection (e.g., renal), ischemic stroke, corneal healing (ocular administration), diabetic nephropathy, cirrhosis, portal hypertension, diabetic would healing, systemic sclerosis, cervical ripening at time of labor, preeclampsia, portal hypertension, or fibrosis. [00177] Disclosed herein are uses of an immunoglobulin fusion protein in the manufacture of a medicament for the treatment of a disease or condition. In some embodiments, the

immunoglobulin fusion protein comprises a therapeutic peptide attached to an immunoglobulin region. In some embodiments, the therapeutic peptide is attached to the immunoglobulin region via a chemical linker referred to as a connecting peptide. In some embodiments, the therapeutic peptide is attached to the amino terminus of the immunoglobulin region. In some embodiments, the therapeutic peptide is relaxin. In some embodiments, the immunoglobulin fusion protein comprises an immunoglobulin region comprising a Palivizumab attached to a relaxin peptide, wherein the therapeutic peptide is attached the amino terminus of the immunoglobulin region. In some embodiments, the immunoglobulin fusion protein comprises a heavy chain fusion with an amino acid sequence selected from SEQ ID NO: 20 and 22 and a light chain with an amino acid sequence selected from SEQ ID NO: 10-12. In some embodiments, the immunoglobulin fusion protein comprises a heavy chain fusion with an amino acid sequence at least 70% identical to SEQ ID NO: 22 and a light chain with an amino acid sequence at least 70% identical to SEQ ID NO: 12. In some embodiments, the immunoglobulin fusion protein comprises a heavy chain fusion with an amino acid sequence at least 90% identical to SEQ ID NO: 22 and a light chain with an amino acid sequence at least 90% identical to SEQ ID NO: 12. In some embodiments, the immunoglobulin fusion protein comprises a heavy chain fusion with an amino acid sequence at least 95% identical to SEQ ID NO: 22 and a light chain with an amino acid sequence at least 95% identical to SEQ ID NO: 12. In some embodiments, the immunoglobulin fusion protein comprises a heavy chain fusion with an amino acid sequence at least 99% identical to SEQ ID NO: 22 and a light chain with an amino acid sequence at least 99% identical to SEQ ID NO: 12. The disease or condition may be a cardiovascular disease. The

[00178] Disclosed herein is the use of an immunoglobulin fusion protein in the manufacture of a medicament for the treatment of a cardiovascular disease or condition. The immunoglobulin fusion protein may be any of the immunoglobulin fusion proteins disclosed herein. The immunoglobulin fusion protein may comprise an immunoglobulin region attached to one or more therapeutic peptides. In some embodiments, the therapeutic peptide is attached the amino terminus of the immunoglobulin region. The cardiovascular disease or condition may be acute heart failure. The cardiovascular disease or condition may be cardiac hypertrophy. The immunoglobulin region may comprise one or more immunoglobulin domains. The immunoglobulin domain may be an immunoglobulin A, an immunoglobulin D, an immunoglobulin E, an immunoglobulin G, or an immunoglobulin M. The immunoglobulin domain may be an immunoglobulin heavy chain region or fragment thereof. The

immunoglobulin domain may be an immunoglobulin light chain region or fragment thereof. The immunoglobulin domain may be from an anti-viral, anti -bacterial, anti-parasitic, and/or anti-fungal immunoglobulin. In some instances, the immunoglobulin domain is from a mammalian immunoglobulin. Alternatively, the immunoglobulin domain is from a chimeric immunoglobulin. The immunoglobulin domain may be from an engineered immunoglobulin or recombinant immunoglobulin. The immunoglobulin domain may be from a humanized, human engineered or fully human immunoglobulin. The mammalian immunoglobulin may be a bovine immunoglobulin. The mammalian immunoglobulin may be a human immunoglobulin. In other instances, the mammalian immunoglobulin is a murine immunoglobulin. The immunoglobulin fusion protein, immunoglobulin region and/or therapeutic peptide may further comprise one or more linkers. The linker may attach the therapeutic peptide to the immunoglobulin region. The therapeutic peptide may be a peptide or derivative or variant thereof. Alternatively, therapeutic peptide is a small molecule. The therapeutic peptide may be relaxin.

[00179] Disclosed herein is the use of an immunoglobulin fusion protein in the manufacture of a medicament for the treatment of a cardiovascular disease or condition, wherein the

immunoglobulin fusion protein comprises a heavy chain fusion having an amino acid sequence at least 90% identical to SEQ ID NOs: 20 or 22 and a light chain having an amino acid sequence at least 90% identical to SEQ ID NOs: 10-12. In some embodiments, the immunoglobulin fusion protein comprises a heavy chain fusion having an amino acid sequence at least 90% identical to SEQ ID NOs: 22 and a light chain having an amino acid sequence at least 90% identical to SEQ ID NOs: 12. The composition may further comprise a pharmaceutically acceptable carrier. The subject may be a mammal. The mammal may be a human. The cardiovascular disease may comprise one or more of acute decompensated heart failure, right heart failure, left heart failure, global failure, ischemic cardiomyopathy, dilated cardiomyopathy, heart failure associated with congenital heart defects, heart failure associated with heart valve defects, mitral stenosis, mitral insufficiency, aortic stenosis, aortic insufficiency, tricuspid stenosis, tricuspid insufficiency, pulmonary stenosis, pulmonary valve insufficiency, heart failure associated with combined heart valve defects, myocardial inflammation (myocarditis), chronic myocarditis, acute myocarditis, viral myocarditis, diabetic heart failure, alcoholic cardiomyopathy, heart failure associated with cardiac storage disorders, diastolic heart failure, and systolic heart failure. [00180] Further disclosed herein are uses of an immunoglobulin fusion protein for the treatment of a disease or condition. Disclosed herein is the use of an immunoglobulin fusion protein for the treatment of a disease or condition in a subject in need thereof. The immunoglobulin fusion protein may be any of the immunoglobulin fusion proteins disclosed herein. The

immunoglobulin fusion protein may comprise an immunoglobulin region attached to one or more therapeutic peptides. In some embodiments, the therapeutic peptide is attached the amino terminus of the immunoglobulin region. The immunoglobulin region may comprise one or more immunoglobulin domains. The immunoglobulin domain may be an immunoglobulin A, an immunoglobulin D, an immunoglobulin E, an immunoglobulin G, or an immunoglobulin M. The immunoglobulin domain may be an immunoglobulin heavy chain region or fragment thereof. The immunoglobulin domain may be an immunoglobulin light chain region or fragment thereof. The immunoglobulin domain may be from an anti-viral, anti-bacterial, antiparasitic, and/or anti-fungal immunoglobulin. In some instances, the immunoglobulin domain is from a mammalian immunoglobulin. Alternatively, the immunoglobulin domain is from a chimeric immunoglobulin. The immunoglobulin domain may be from an engineered

immunoglobulin may be a bovine immunoglobulin. The mammalian immunoglobulin may be a human immunoglobulin. In other instances, the mammalian immunoglobulin is a murine immunoglobulin. The immunoglobulin fusion protein, immunoglobulin region and/or therapeutic peptide may further comprise one or more linkers. The linker may attach therapeutic peptide to the immunoglobulin region. The therapeutic peptide may be a peptide or derivative or variant thereof. The therapeutic peptide may be relaxin. The disease or condition may be an autoimmune disease, heteroimmune disease or condition, inflammatory disease, pathogenic infection, thromboembolic disorder, respiratory disease or condition, metabolic disease, central nervous system (CNS) disorder, bone disease or cancer. In other instances, the disease or condition is a blood disorder. In some instances, the disease or condition is obesity, diabetes, osteoporosis, anemia, or pain. The disease or condition may be a growth disorder.

[00181] Disclosed herein is the use of an immunoglobulin fusion protein for the treatment of a cardiovascular disease or condition in a subject in need thereof. In some embodiments, the immunoglobulin fusion protein treats a disease or condition selected from heart failure, acute coronary syndrome, atrial fibrillation, cardiac fibrosis, and coronary artery disease. The immunoglobulin fusion protein may be any of the immunoglobulin fusion proteins disclosed herein. The immunoglobulin fusion protein may comprise an immunoglobulin region attached to one or more therapeutic peptides. In some embodiments, the therapeutic peptide is attached the amino terminus of the immunoglobulin region. The cardiovascular disease or condition may be acute heart failure. The cardiovascular disease or condition may be cardiac hypertrophy. The immunoglobulin region may comprise one or more immunoglobulin domains. The

immunoglobulin domain may be an immunoglobulin A, an immunoglobulin D, an

immunoglobulin E, an immunoglobulin G, or an immunoglobulin M. The immunoglobulin domain may be an immunoglobulin heavy chain region or fragment thereof. The

immunoglobulin domain may be an immunoglobulin light chain region or fragment thereof. The immunoglobulin domain may be from an anti-viral, anti -bacterial, anti-parasitic, and/or anti-fungal immunoglobulin. In some instances, the immunoglobulin domain is from a mammalian immunoglobulin. Alternatively, the immunoglobulin domain is from a chimeric immunoglobulin. The immunoglobulin domain may be from an engineered immunoglobulin or recombinant immunoglobulin. The immunoglobulin domain may be from a humanized, human engineered or fully human immunoglobulin. The mammalian immunoglobulin may be a bovine immunoglobulin. The mammalian immunoglobulin may be a human immunoglobulin. In other instances, the mammalian immunoglobulin is a murine immunoglobulin. The immunoglobulin fusion protein, immunoglobulin region and/or therapeutic peptide may further comprise one or more linkers. The linker may attach the therapeutic peptide to the immunoglobulin region. The therapeutic peptide may be a peptide or derivative or variant thereof. The therapeutic peptide may be relaxin.

[00182] Disclosed herein is the use of an immunoglobulin fusion protein for the treatment of a cardiovascular disease or condition in a subject in need thereof, wherein the immunoglobulin fusion protein comprises a heavy chain fusion having an amino acid sequence at least 90% identical to SEQ ID NOs: 20 or 22 and a light chain having an amino acid sequence at least 90% identical to SEQ ID NOs: 10-12. In some embodiments, the immunoglobulin fusion protein comprises a heavy chain fusion having an amino acid sequence at least 90% identical to SEQ ID NOs: 22 and a light chain having an amino acid sequence at least 90% identical to SEQ ID NOs: 12. The composition may further comprise a pharmaceutically acceptable carrier. The subject may be a mammal. The mammal may be a human. The cardiovascular disease may comprise one or more of acute decompensated heart failure, right heart failure, left heart failure, global failure, ischemic cardiomyopathy, dilated cardiomyopathy, heart failure associated with congenital heart defects, heart failure associated with heart valve defects, mitral stenosis, mitral insufficiency, aortic stenosis, aortic insufficiency, tricuspid stenosis, tricuspid insufficiency, pulmonary stenosis, pulmonary valve insufficiency, heart failure associated with combined heart valve defects, myocardial inflammation (myocarditis), chronic myocarditis, acute myocarditis, viral myocarditis, diabetic heart failure, alcoholic cardiomyopathy, heart failure associated with cardiac storage disorders, diastolic heart failure, and systolic heart failure.

Pharmacological Properties

[00183] Further disclosed herein are methods of improving one or more pharmacological properties of a therapeutic peptide. The method may comprise producing an immunoglobulin fusion protein disclosed herein. Examples of pharmacological properties may include, but are not limited to, half-life, stability, solubility, immunogenicity, toxicity, bioavailability, absorption, liberation, distribution, metabolization, and excretion. Liberation may refer to the process of releasing of a therapeutic peptide from the pharmaceutical formulation. Absorption may refer to the process of a substance entering the blood circulation. Distribution may refer to the dispersion or dissemination of substances throughout the fluids and tissues of the body. Metabolization (or biotransformation, or inactivation) may refer to the recognition by an organism that a foreign substance is present and the irreversible transformation of parent compounds into daughter metabolites. Excretion may refer to the removal of the substances from the body.

[00184] The half-life of a therapeutic peptide may greater than the half-life of the non- conjugated therapeutic peptide. The half-life of the therapeutic peptide may be greater than 4 hours, greater than 6 hours, greater than 12 hours, greater than 24 hours, greater than 36 hours, greater than 2 days, greater than 3 days, greater than 4 days, greater than 5 days, greater than 6 days, greater than 7 days, greater than 8 days, greater than 9 days, greater than 10 days, greater than 11 days, greater than 12 days, greater than 13 days, or greater than 14 days when administered to a subject. The half-life of the therapeutic peptide may be greater than 4 hours when administered to a subject. The half-life of the therapeutic peptide may be greater than 6 hours when administered to a subject.

[00185] The half-life of the therapeutic peptide may increase by at least about 2, 4, 6, 8, 10, 12, 14, 16, 18, or 20 or more hours. The half-life of the therapeutic peptide may increase by at least about 2 hours. The half-life of the therapeutic peptide may increase by at least about 4 hours. The half-life of the therapeutic peptide may increase by at least about 6 hours. The half-life of the therapeutic peptide may increase by at least about 8 hours.

[00186] The half-life of a therapeutic peptide may be at least about 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, or 10-fold greater than the half-life of the non-conjugated therapeutic peptide. The half-life of a therapeutic peptide an immunoglobulin described herein may be at least about 15, 16, 17, 18, 19, 20, 25, 30, 35, 40, 45, or 50-fold greater than the half- life of the non-conjugated therapeutic peptide. The half-life of a therapeutic peptide an immunoglobulin described herein may be at least about 2-fold greater than the half-life of the non-conjugated therapeutic peptide. The half-life of a therapeutic peptide an immunoglobulin described herein may be at least about 5-fold greater than the half-life of the non-conjugated therapeutic peptide. The half-life of a therapeutic peptide an immunoglobulin described herein may be at least about 10-fold greater than the half-life of the non-conjugated therapeutic peptide.

[00187] The half-life of a therapeutic peptide an immunoglobulin described herein may be at least about 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 55%, 60%, 65%, 70%, 75%, 80%, 85%), 90%), 95%), or 97% greater than the half-life of the non-conjugated therapeutic peptide. The half-life of a therapeutic peptide an immunoglobulin described herein may be at least about 10%) greater than the half-life of the non-conjugated therapeutic peptide. The half-life of a therapeutic peptide an immunoglobulin described herein may be at least about 20% greater than the half-life of the non-conjugated therapeutic peptide. The half-life of a therapeutic peptide an immunoglobulin described herein may be at least about 30% greater than the half-life of the non-conjugated therapeutic peptide. The half-life of a therapeutic peptide an immunoglobulin described herein may be at least about 40% greater than the half-life of the non-conjugated therapeutic peptide. The half-life of a therapeutic peptide an immunoglobulin described herein may be at least about 50% greater than the half-life of the non-conjugated therapeutic peptide.

EXAMPLES

[00188] The activity data provided in the following examples are generally obtained using the immunoglobulin fusion proteins defined in the example and exemplified by the provided SEQ ID. It is to be understood that the activities of any immunoglobulin fusion protein disclosed herein may be enhanced or attenuated depending on conditions not relating to immunoglobulin fusion protein sequence, for example, expression and purification conditions.

Example 1: Construction of palivizumab-relaxin fusion protein vectors for expression in mammalian cells

[00189] Relaxin nucleic acid sequences were synthesized by IDT (IA, USA), and amplified by polymerase chain reaction (PCR).

[00190] The relaxin2 (9GS) (SEQ ID NO: 33) was genetically fused to nucleic acids encoding for a palivizumab heavy chains 1, 2 or 3 (SEQ ID NOs: 6, 7, 8, respectively) using a connecting nucleic acid sequence encoding for the connecting peptide 16GS (SEQ ID NO: 60) by overlap PCR to generate palivizumab(NHl, 2, or 3, 16GS)-relaxin2(9GS) (SEQ ID NOs: 18, 18, 19, respectively). The pPalivizumab(NHl, 2, or 3, 16GS)-relaxin2(9GS) mammalian expression vectors encoding for palivizumab(NHl, 2, or 3, 16GS)-relaxin2(9GS) were created by in-frame ligation of the amplified palivizumab( Hl, 2, or 3, 16GS)-relaxin2(9GS) to the pFuse backbone vector (InvivoGen, CA).

[00191] The gene encoding for palivizumab light chain (SEQ ID NO: 1) was amplified and closed into the pFuse vector to generate a pPalivizumab(L) mammalian expression vector. The resulting mammalian expression vectors were verified by DNA sequencing.

Example 2: Expression and purification of palivizumab-relaxin fusion proteins

[00192] Palivizumab-relaxin heavy chain fusion proteins were each expressed through co- transfection of freestyle HEK293 cells with palivizumab-relaxin heavy chain mammalian expression vectors described in Example 1 and a palivizumab light chain mammalian expression vector. The cells were grown in shaker flasks at 125 rpm with freestyle 293 expression medium (Life Technologies) at 37°C with 5% C02. Expressed proteins were secreted into the culture medium and harvested twice every 48 hours after transfection. The fusion proteins were purified by Protein A/G chromatography (Thermo Fisher Scientific, IL) and analyzed by SDS- PAGE gel. Purified heavy chain fusion proteins expressed with palivizumab light chain are shown in the SDS-PAGE gels of FIG. 1A, FIG. IB, and FIG. 1C. For each gel, the first lane corresponds to a molecular marker, the second lane corresponds to purified protein, and the third lane corresponds to purified protein treated with the reducing agent DTT. FIG. 1 A shows purified palivizumab(NHl, 16GS)-relaxin2(9GS) (SEQ ID NO: 20) and palivizumab L (SEQ ID NO: 9), collectively, SCXl . FIG. IB shows purified palivizumab(NH2, 16GS)-relaxin2(9GS) (SEQ ID NO: 21) and palivizumab L (SEQ ID NO: 9), collectively, SCX2. FIG. 1C shows purified palivizumab(NH3, 16GS)-relaxin2(9GS) (SEQ ID NO: 22) and palivizumab L (SEQ ID NO: 9), collectively, SCX3.

Example 3: Activity of palivizumab-relaxin fusion proteins to activate relaxin receptors

[00193] The activities of palivizumab-relaxin fusion proteins purified in Example 2 were examined by a luciferase assay. HEK293 cells overexpressed with relaxin receptor (LGR7) and cAMP responsive element (CRE)-luciferase (Luc) reporter gene were grown in DMEM supplemented with 10% FBS at 37°C with 5% C02. Cells were seeded in 384-well plates for 24 hours and subsequently independently treated with various concentrations of palivizumab- relaxin fusion proteins purified from Example 2 (SCXl, SCX2, or SCX3) or relaxin2 peptide for an additional 24 hours. Luminescence intensities were then measured using One-Glo

(Promega) luciferase reagent by following manufacturer's instruction. The EC₅₀ values were determined by fitting data into a logistic sigmoidal function: y = A2 + (Al-A2)/(1 + (x/x0)p), where Al is the initial value, A2 is the final value, xO is the inflection point of the curve, and p is the power. The EC₅₀ for relaxin-2 was 22.3 pM. [00194] The EC₅₀ for SCX1 was 69.1 pM. The EC₅₀ for SCX2 was 61.2 pM. The EC₅₀ for SCX3 was 129 pM. The corresponding cures are shown in FIG. 2A (SCX1), FIG. 2B (SCX2), and FIG. 2C (SCX3).

Example 4: Binding of palivizumab-relaxin fusion proteins to RSV-epitope

[00195] To test the reduction of palivizumab-relaxin fusion protein binding to RSV-epitope, an RSV binding assay was performed. Briefly, 0.1 ug of RSV F protein was coated in a 96 well plate. Palivizumab-relaxin fusion proteins as described in Example 2, SCX1, SCX2, and SCX3, and a null palivizumab antibody were added to separate wells. Anti-human IgG (Fc specific) at a 1 :2,000 dilution in 2% BSA, PBS was added to each well. Fluorescence intensity was measured after 25 and 50 minutes. Plots of Fluorescence intensity vs. fusion protein

concentration are shown in FIG. 3 A (25 min) and FIG. 3B (50 min). Tables 1 1 and 12 show the corresponding data for each construct tested.

Example 5: Construction of optimized palivizumab-relaxin fusion protein antibodies

[00196] Optimized palivizumab-relaxin fusion protein antibodies were created by pairing various heavy chain mutations with various light chain mutations. Heavy chain mutations included: NO (SEQ ID NO: 13), N99F, W100G, Y100_aG (SEQ ID NO: 22), and W100A (SEQ ID NO: 20). Light chain mutations included germline (SEQ ID NO: 10), S92N (SEQ ID NO: 1 1), and G91Y (SEQ ID NO: 12). Fc mutations included WT and E233P, L234V, L235A, AG236, A327G, A330S, and P331 S. Construct components are summarized in Table 13 below.

Example 5: Measurement of RSV binding by optimized palivizumab-relaxin fusion protein antibodies

[00197] Optimized palivizumab-relaxin fusion protein antibodies were tested for binding to RSV by ELISA assay. l OOng/well RSV F protein was coated on 96-well plate in PBS 4 °C overnight. The plate was blocked with 2% BS A/PBS at room temperature for lhr, then washed twice with 200 μΙ_, PBS. The fusion antibodies were incubated at various concentrations (as indicated in FIG. 4) in 2% BS A/PBS at room temperature for 1 hr. Plates were washed with PBS (0.025% Tween-20 in PBS) four times and washed with PBS one time. Then plates were incubated with horseradish peroxidase-conjugated anti-human IgG (Fc specific) in PBS at room temperature for 1 hr, washed with PBS (0.025% Tween-20 in PBS) five times, developed with QuantaBlu fluorogenic peroxidase substrate (Thermo Fisher Scientific, IL). Binding was quantified using Spectramax fluorescence plate reader with excitation at 325nm and emission at 420nm. Binding curves are shown in FIG. 5. Binding Kd values were determined (Table 14).

Example 6: Measurement of thermal stability of optimized palivizumab-relaxin fusion protein antibodies

[00198] Thermal stability of optimized palivizumab-relaxin fusion protein antibodies was determined. Results of this assay are shown in Table 15 below. The thermal stabilities were measured using a fluorescent protein binding dye (Protein Thermal Shift assay, Life

Technologies Co., CA). Briefly, Samples with a working volume of 20 per well were prepared by mixing 5 ul protein Thermal shift buffer, 2.5 μΐ_^ of 8x protein thermal shift Dye with 12.5 μΐ. of antibody (0.5 mg/mL) in DPBS buffer, loaded onto a 96-well 0.2 thin-wall PCR plate, and sealed with S MicroAmp® Optical Adhesive Film. Then a melt curve was run on a real-time PCR instrument. Data were collected at 1°C intervals from 25°C through 99°C on the StepOnePlus™ Real-Time PCR System and analyzed using the Protein Thermal Shift™

Software.

Example 7: Expression and purification of optimized palivizumab-relaxin fusion proteins

[00199] Palivizumab-relaxin heavy chain fusion proteins were each expressed through co- transfection of freestyle FIEK293 cells with palivizumab-relaxin heavy chain mammalian expression vectors described in Example 5. The cells were grown in shaker flasks at 125 rpm with freestyle 293 expression medium (Life Technologies) at 37°C with 5% C02. Expressed proteins were secreted into the culture medium and harvested twice every 48 hours after transfection. The fusion proteins were purified by Protein A/G chromatography (Thermo Fisher Scientific, IL) and analyzed by SDS-PAGE gel. Purified heavy chain fusion proteins expressed with palivizumab light chain are shown in the SDS-PAGE gels of FIGs 5A-F. For each gel, the first lane corresponds to a molecular marker, the second lane corresponds to purified protein, and the third lane corresponds to purified protein treated with the reducing agent DTT. FIG. 5 A shows purified RLX301 (SEQ ID NO: 22) and (SEQ ID NO: 10). FIG. 5B shows purified RLX302 (SEQ ID NO: 22) and (SEQ ID NO: 12). FIG. 5C shows purified RLX303 (SEQ ID NO: 22) and (SEQ ID NO: 1 1). FIG. 5D shows purified RLX304 (SEQ ID NO: 20) and (SEQ ID NO: 10). FIG. 5E shows purified RLX305 (SEQ ID NO: 20) and (SEQ ID NO: 12). FIG. 5F shows purified RLX306 (SEQ ID NO: 20) and (SEQ ID NO: 1 1).

Example 8: Activity of optimized palivizumab-relaxin fusion proteins to activate relaxin receptors

[00200] The activities of optimized palivizumab-relaxin fusion proteins purified in Example 7 were examined by a luciferase assay. HEK293 cells overexpressed with relaxin receptor (LGR7) and cAMP responsive element (CRE)-luciferase (Luc) reporter gene were grown in DMEM supplemented with 10% FBS at 37°C with 5% C02. Cells were seeded in 384-well plates for 24 hours and subsequently independently treated with various concentrations of palivizumab-relaxin fusion proteins purified from Example 7 (RLX301, RLX302, RLX303, RLX304, RLX305, or RLX306) or relaxin2 peptide for an additional 24 hours. Luminescence intensities were then measured using One-Glo (Promega) luciferase reagent by following manufacturer's instruction.

[00201] The values were determined by fitting data into a logistic sigmoidal function: y = A2 + (Al-A2)/(1 + (x/x0)p), where Al is the initial value, A2 is the final value, xO is the inflection point of the curve, and p is the power. The EC₅₀ for relaxin-2 was 22 pM. The EC₅₀ for RLX301 was 72 pM. The EC₅₀ for RLX302 was 179 pM. The EC₅₀ for RLX303 was 86 pM. The EC₅₀ for RLX304 was 78 pM. The EC₅₀ for RLX305 was 98 pM. The EC₅₀ for RLX306 was 153 pM. The corresponding cures are shown in FIG. 6 A (RLX301), FIG. 6B (RLX302), FIG. 6C (RLX303), FIG. 6D (RLX304), FIG. 6E (RLX305), and FIG. 6F (RLX306).

[00202] Activities of optimized palivizumab-relaxin fusion proteins, RLX 302 and RLX303, were further examined using UL-hLGR7-Cre-Luc reporter cell line. The EC₅₀ for relaxin-2 was 20 pM and SA was 1000 units^g. The EC₅₀ for RLX302 was 130 pM and SA was 5.9 units^g. The EC₅₀ for RUG 03 was 93 pM and SA was 8.0 units^g. The corresponding curves are shown in FIG. 7A (RLX302) and FIG. 7B (RLX303).

Example 9: RLX303 Protein Characterization

[00203] RLX303 was characterized by analytical size-excusion chromatography and liquid chromatography-mass spectroscopy. RLX303 was confirmed to contain 96% of RLX303 monomer protein with correct light chain and heavy chain masses. Protein concentration was found to be 26-29 mg/ml in PBS (pH 7.4). Analytical size-exchange chromatography is shown in FIG. 8A. Liquid chromatography-mass spectroscopy is shown in FIG. 8B.

Example 10: Relaxin-Ig fusion serum stability

[00204] Serum stability of Relaxin-2 peptide, RLX302, and RLX303 was determined. Proteins were incubated with serum, then activity was measured in cell-based assays. Relaxin-Ig fusions remained stable over 5 days in human serum with about 15% loss of activity in cyno serum. Over 95% of human relaxin-2 peptide is gone after 5 days with degradation more rapid in cyno serum than in human serum. Sample concentrations were determined by ELISA and LC/MS was used to evaluate the chemical stability of the Relaxin-Ig fusions in serum. Stability curves are shown in FIG. 9A (Relaxin-2 peptide), FIG. 9B (RLX302), and FIG. 9C (RLX303). Example 11: Relaxin Ig-fusion PK Analysis

[00205] Pharmacokinetic properties of RLX302 and RLX303 were evaluated in mice using a single IV injection in CD1 mice at a dose of 3.7 mg/kg (n=3). Comparable exposure and half- life was found between the RLX302 and RUG 03 fusion proteins. Pharmacokinetic data for the mouse experiments is found in Table 16. Pharmacokinetic curves for the mouse experiments are shown in FIG. 10.

[00206] Pharmacokinetic properties of RLX302 and RLX303 were evaluated through a single i.v. or s.c injection in SD1 rats at a dosage of 2.1 mg/kg (n=3). Comparable exposure and half- life was found between the RLX302 and RLX303 fusion proteins. For s.c. dosing, in the RLX302 dosed animals, samples from 2 out 3 rats at timepoint 336 hr were out of detection range. In the RLX303 s.c. dosed animals, all animals were below assay detection at timepoint 336hr Pharmacokinetic data for the rat experiments is found in Table 17. Pharmacokinetic curves for the rat experiments are shown in FIG. 1 1 A and FIG. 1 IB.

Example 12: Mouse Pharmacodynamics Analysis

[00207] Pharmacodynamic properties of RLX302 and RLX303 were evaluated using a s.c. dose between 0.02 to 0.6 mg/kg in estrogen-primed CD1 female mice (n=8-12). Mice were treated with human relaxin-2 peptide as a control Interpubic ligament width was measured at 1 week post dosing. Pharmacodynamic data is shown in FIG. 12A. Mice were treated with human relaxin-2 peptide as a control and pubic symphasis width was measured 24 hours post injection. Control data is shown in FIG. 12B. Example 13: Phase 1 Clinical Trials

[00208] Cohorts of 10 volunteers, 8 'active' and 2 placebo, are recruited for single ascending dose safety evaluation and PD measures of RLX302 and RLX303 in healthy volunteers. Five dose-levels are used having a starting dose -0.1 mg/kg IV, half-log escalating dose groups (0.1, 0.3, 1.0, 3.0, 10 mg/kg). Intravenous doses are used initially to support future acute/sub acute indications where rapid onset of action is preferred (based on differences seen preclinically); also allows discontinuation of infusion if acute adverse events occur. 2-3 dose-levels are used (high, mid, +/- low) with subcutaneous (SC) dosing to establish SC safety, local tolerability, PK, and bioavailability. Additional subjects (optional) are specified in the protocol to add up to 2 lower or intermediate dose groups depending on safety/tolerability/PD effects. Patients are followed for 3 months for PK, safety.

[00209] For multiple ascending dose safety evaluation, 5 dose groups are used: 1, 3, 10 mg/kg SC Q2w and 1.5mg/kg Qlw dosing. Q2w group receives 7 SC injections over 12 weeks; Qlw group receives 13 injections over 12 weeks. Cohorts of ten healthy volunteers, 8 'active' and 2 placebo, safety evaluation and PD measures in healthy volunteers. The goal is to establish safety/tolerability/PK and PD across dose range in healthy volunteers. Potential for

immunogenicity (ADAs) is evaluated using pooled data. Additional subjects (optional 2 cohorts) specified in the protocol to explore lower, intermediate, and alternate frequency (Q month, additional Qlw groups) Total follow up for 5 months (from initial dose) for PK, safety. Example 14: Phase lb Clinical Trials

[00210] Long-acting relaxin-immunoglobulin fusion, RLX302 is studied in a Phase lb clinical trial for reducing heart failure hospitalization, cardiovascular death, and dyspnea. The primary objective is, using parallel groups, randomized, Pbo-controlled safety, tolerability, PK and PD study in subjects with compensated stable HFrEF to support the safety assessment and dose range selection for a chronic dosing Phase 2 Program in chronic heart failure by: 1)

Characterizing the safety and tolerability of subcutaneous RLX302in patients with stable compensated HFrEF and 2) Characterize the PK of subcutaneous RLX302 in patients with HFrEF. The secondary objective is: 1) characterize the cardiac PD effects of RLX302 using blood and imaging markers in a population of HFrEF patients with baseline elevated NT- proB P (>600pg/ml - TBD) and 2) Characterize the renal PD effects of RLX302 in a population of HFrEF patients with baseline elevated NT-proB P (>600pg/ml - TBD). Tertiary objectives include characterizing the effects of RUG 02 on markers of cardiac damage and clinical outcomes related to RLX302 effect on cardiac and renal physiology. Primary endpoints are: 1) Safety measurements including standard clinical and laboratory evaluations (BP, clin labs, ECG, etc.), 2) PK, and 3) immunogenicity assessments (ADAs, AEs). Secondary endpoints include: 1) Cardiac biomarkers: NT-proB P, 2) Cardiac Imaging (transthoracic echocardiography): Left Atrial size, EF, strain, diastolic function, remodeling indices, and 3) Renal physiology/injury markers: renal blood flow, GFR, cystatin C, KXM1, plasma BUN & creatinine. Tertiary endpoints include: 1) MACE events, FIF hospitalization, CV death, all cause mortality; 2) composite clinical assessment (NYHA classification, Pt Global Assessment, MACE); 3) Hospitalization for renal failure; and 4) Adjustments in diuretics and other HF medications (evidence of intensification of therapy or potential diuretic sparing effect) from baseline. The strategic goals are: 1) Early capture of potential mechanism-based biologic and clinical benefits to enable accelerated investment in further development activities (chronic tox, Ph 2 startup, etc.) and 2) Trigger transition points in collaboration. Study rationale is to assess the safety, tolerability, and early signs of efficacy for RLX302 in the major eventual target population of FIFrEF patients. Strong biologic and/or clinical signals of treatment benefit would enhance confidence for further investment and potential timeline acceleration. Key biomarker objectives include >30% reduction in NT-proBNP during first week of treatment. Key inclusion criteria are: HFrEF, NYHA class II-III, Recent HF hospitalization within 3-6 months, other enrichment criteria for high risk HF e.g. NT-proBNP>600-900 pg/mL, and eGFR (limit to be determined based on projected impact on enrollment). Key exclusion criteria are HFpEF, CrCl<30

(advanced renal dysfunction), and BP restrictions similar to Pre-RELAX AHF/RELAX

AHF/PARADIGM (e.g. SBP<100). Key features of the trial are: 1) randomized, double blind, multiple dose; 2) HFrEF patients, 3) four week exposure (2 SC doses), 4 weeks timepoint from baseline = primary endpoint; assessments continued at weeks 8 and 12 (study completion); 4) 2- 3 dose levels + placebo (approx. 120 subjects total); and 5) interim analysis based on 1 or 2 wk follow up data and 75% recruitment - potential to trigger investment in chronic tox and/or manufacturing of drug product. Treatment arms will include PBO, dose levels MTD, mid- and low-dose guided by SAD in HV. Sample sizes will be 30-40 subjects per arm as guided by available data.

[00211] Clinically meaningful, dose dependent changes in multiple aspects of potential therapeutic benefit are observed (as outlined in the key biomarker objectives and below).

Signals are concordant and of sufficient magnitude to reasonably preclude a chance finding. Therapeutic benefits include: reduction in NT-proBNP, reduction in hs-Tnl/T, improvement in Echo parameters, e.g., reduction in LA size (in patients with increased LA size at baseline), reduction of clinical signs of congestion (clinical signs/diuretic use, LFTs), decreased serum creatinine and BUN, improved renal hemodynamics (improved RPF with stable or improved GFR ± reduced Filtration Fraction), improvement of dyspnea (symptom scores; includes DOE, PND), worsening HF over 4-12 weeks (during active treatment phase and/or follow-up period), hospital admission for AHF or Renal Failure over 4 weeks (during active treatment phase and/or follow-up period). Treatment with RLX302 results in improved outcomes with more convenient dosing schedules than current relaxin-based treatments (e.g. serelaxin).

[00212] The preceding merely illustrates the principles of the invention. It will be appreciated that those skilled in the art will be able to devise various arrangements which, although not explicitly described or shown herein, embody the principles of the invention and are included within its spirit and scope. Furthermore, all examples and conditional language recited herein are principally intended to aid the reader in understanding the principles of the invention and the concepts contributed by the inventors to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions. Moreover, all statements herein reciting principles, aspects, and embodiments of the invention as well as specific examples thereof, are intended to encompass both structural and functional equivalents thereof. Additionally, it is intended that such equivalents include both currently known equivalents and equivalents developed in the future, i.e., any elements developed that perform the same function, regardless of structure. The scope of the present invention, therefore, is not intended to be limited to the exemplary embodiments shown and described herein. Rather, the scope and spirit of the present invention is embodied by the appended claims.

[00213] While preferred embodiments of the present invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous variations, changes, and substitutions will now occur to those skilled in the art without departing from the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. It is intended that the following claims define the scope of the invention and that methods and structures within the scope of these claims and their equivalents be covered thereby.

[00214] All references cited herein are incorporated by reference in their entirety and for all purposes to the same extent as if each individual publication or patent or patent application was specifically and individually indicated to be incorporated by reference in its entirety for all purposes.

Claims

CLAIMS What is claimed is:

1. A composition comprising: (a) relaxin therapeutic peptide comprising a relaxin B chain connected via a peptide linker to a relaxin A chain; and (b) an antibody variable domain comprising SEQ ID NO: 75: SMITX(1)X(2)X(3)FDV, wherein X(l) is selected from F, A, G, and P; X(2) is selected from G, A, S, T, and P; and X(3) is selected from G, A, V, L, and P; and wherein the relaxin therapeutic peptide is connected to the amino-terminus of the antibody variable domain with a connecting peptide.

2. The composition of claim 1, wherein the antibody variable domain is modified from a heavy chain variable domain of a palivizumab antibody comprising SEQ ID NO: 74, and the composition exhibits reduced binding to RSV-F as compared to the palivizumab antibody.

3. The composition of claim 1 or claim 2, wherein X(l) is F.

4. The composition of any of claims 1-3, wherein X(2) is G.

5. The composition of any of claims 1-4, wherein X(2) is A.

6. The composition of any of claims 1-5, wherein X(3) is G.

7. The composition of any of claims 1-6, wherein the antibody variable domain further comprises one or more of SEQ ID NOS: 72 and 73.

8. The composition of any of claims 1-7, further comprising an antibody sequence comprising one or more of SEQ ID NOS: 89 or 90.

9. The composition of any of claims 1-8, further comprising an antibody sequence comprising SEQ ID NO: 92: FQX(4)X(5)GYPFT, wherein X(4) is selected from G, Y, F, W, P, L, V, and A; and X(5) is selected from S, N, G, A, V, L, and P.

10. The composition of claim 9, wherein X(4) is Y and X(5) is S.

11. The composition of claim 10, wherein X(4) is G and X(5) is N.

12. The composition of any of claims 1-11, wherein the relaxin B chain comprises an amino acid sequence of SEQ ID NO: 46.

13. The composition of any of claims 1-12, wherein the relaxin A chain comprises an amino acid sequence of SEQ ID NO: 47.

14. The composition of any of claims 1-13, wherein the peptide linker comprises at least about 4 consecutive amino acids comprising any combination of G and S amino acids.

15. The composition of any of claims 1-14, wherein the connecting peptide comprises at least about 4 consecutive amino acids comprising any combination of G and S amino acids.

16. The composition of any of claims 1-15, wherein the composition further comprises an Fc region of an antibody and the Fc region comprises one or more mutations to reduce antibody- dependent cellular cytotoxicity.

17. The composition of any of claims 1-16, wherein the Fc region comprises an amino acid sequence at least about 90% identical to SEQ ID NO: 98.

18. A method of treating a disease or condition in an individual in need thereof, the method comprising administering to the individual a composition comprising a relaxin therapeutic peptide; wherein the composition is intravenously or subcutaneously administered in less than or equal to 6 hours.

19. The method of claim 18, wherein the composition is administered in less than or equal to 4, 3, 2 or 1 hours.

20. The method of claim 18 or claim 19, wherein the composition is administered during a treatment period of about one day to about 1 week.

21. The method of claim 20, wherein the composition is administered about 1, 2, 3, 4, 5, 6 or 7 times.

22. The method of claim 20 or claim 21, wherein the disease or condition is selected from acute heart failure, acute coronary syndrome with cardiac dysfunction, ischemia reperfusion associated with solid organ transplantation, cardiopulmonary bypass, ischemic stroke, or preeclampsia.

23. The method of claim 22, wherein the disease or condition is solid organ transplantation and the organ is selected from the lung, kidney, liver and heart.

24. The method of claim 18 or claim 19, wherein the composition is administered during a treatment period lasting at least about one week.

25. The method of claim 24, wherein the composition is administered twice per week, once per week, four times per month, three times per month, twice per month, once per month, or once per every two months.

26. The method of claim 24 or claim 25, wherein the disease or condition is selected from diffuse scleroderma, chronic heart failure, diabetic nephropathy, cirrhosis, portal hypertension, atrial fibrillation, cardiac fibrosis, and diabetic wound healing.

27. A method of treating a disease or condition in an individual in need thereof, the method comprising administering to the individual a composition comprising a relaxin therapeutic peptide; wherein the composition is administered to the eye.

28. The method of claim 27, wherein the composition is administered in a liquid solution or suspension.

29. The method of any of claims 18-28, wherein the composition comprises a relaxin therapeutic peptide connected to an amino-terminus of an antibody variable domain via a connecting peptide

30. The method of claim 29, wherein the relaxin polypeptide comprises a relaxin B chain and a relaxin A chain connected by a peptide linker.

31. The method of claim 29 or claim 30, wherein the relaxin polypeptide comprises (a) relaxin therapeutic peptide comprising a relaxin B chain connected via a peptide linker to a relaxin A chain; and (b) an antibody variable domain comprising SEQ ID NO: 75:

SMITX(1)X(2)X(3)FDV, wherein X(l) is selected from F, A, G, and P; X(2) is selected from G, A, S, T, and P; and X(3) is selected from G, A, V, L, and P; and wherein the relaxin therapeutic peptide is connected to the amino-terminus of the antibody variable domain with a connecting peptide.

32. The method of claim 31, wherein the antibody variable domain is modified from a heavy chain variable domain of a palivizumab antibody comprising SEQ ID NO: 74, and the composition exhibits reduced binding to RSV-F as compared to the palivizumab antibody.

33. The method of claim 31, wherein X(l) is F.

34. The method of claim 31 or claim 33, wherein X(2) is G.

35. The method of claim 31 or claim 33, wherein X(2) is A.

36. The method of claim 31 or claim 33, wherein X(3) is G.

37. The method of any one of claims 31-36, wherein the antibody variable domain further comprises one or more of SEQ ID NOS: 72 and 73.

38. The method of any one of claims 31-37, further comprising an antibody sequence comprising one or more of SEQ ID NOS: 89 or 90.

39. The method of any one of claims 31-38, further comprising an antibody sequence comprising SEQ ID NO: 92 (FQX(4)X(5)GYPFT), wherein X(4) is selected from G, Y, F, W, P, L, V, and A; and X(5) is selected from S, N, G, A, V, L, and P.

40. The method of claim 39, wherein X(4) is Y and X(5) is S.

41. The method of claim 39, wherein X(4) is G and X(5) is N.

42. The method of any of claims 30-41, wherein the relaxin B chain comprises an amino acid sequence of SEQ ID NO: 46.

43. The method of any of claims 30-42, wherein the relaxin A chain comprises an amino acid sequence of SEQ ID NO: 47.

44. The method of any of claims 31-43, wherein the peptide linker comprises at least about 4 consecutive amino acids comprising any combination of G and S amino acids.

45. The method of any of claims 31-44, wherein the connecting peptide comprises at least about 4 consecutive amino acids comprising any combination of G and S amino acids.

46. The method of any of claims 31-45, wherein the relaxin polypeptide further comprises an Fc region of an antibody and the Fc region comprises one or more mutations to reduce antibody-dependent cellular cytotoxicity.

47. The method of claim 46, wherein the Fc region comprises an amino acid sequence at least about 90% identical to SEQ ID NO: 98.