WO2018032785A1 - 人成纤维细胞生长因子21融合蛋白及其制备方法与用途 - Google Patents
人成纤维细胞生长因子21融合蛋白及其制备方法与用途 Download PDFInfo
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Definitions
- the present invention relates to a human fibroblast growth factor 21 (hFGF21) fusion protein, and to the use of the fusion protein for the preparation of a medicament for the treatment of diabetes, obesity, dyslipidemia and/or metabolic syndrome.
- hFGF21 human fibroblast growth factor 21
- Fibroblast growth factors (FGFs) family is a kind of polypeptide growth factor with various physiological functions.
- the mammalian FGF family has been found to have 22 members, which are divided into 7 subfamilies.
- Fibroblast growth factor 21 (FGF21) belongs to the FGF19/21/23 subfamily and is mainly expressed in the liver. It is also expressed in tissue cells related to glycolipid metabolism, such as adipose tissue, islet ⁇ cells, and muscle tissue. . Unlike other FGF members, this subfamily functions in an endocrine manner, involved in the regulation of energy and bile acid homeostasis, glucose and lipid metabolism, and homeostasis of phosphate and vitamin D (Moore DD et al., Science, 2007).
- the FGF21 mature protein consists of 181 amino acids. Unlike most members of the FGF family, FGF21 does not specifically bind to heparin to promote cell growth and differentiation.
- the C-terminus of FGF21 is closely related to its biological activity. The C-terminus of FGF21 directly binds to the cofactor ⁇ -Klotho, and then activates the FGFR receptor and downstream related signaling molecules, which in turn exerts its biological effects (Yie J et al., FEBS Lett, 2009, 583). (1): 19-24; and Micanovic R et al, J Cell Physiol, 2009, 219(2): 227-234).
- FGF21 regulates the expression of glucose transporter 1 (GLUT1) and promotes the uptake of glucose in 3T3-L1 cells and human primary adipocytes.
- GLUT1 glucose transporter 1
- FGF21 significantly reduces mouse body weight and blood glucose levels in genetically controlled or diet-induced obese mice, while also reducing triglyceride levels in the liver and serum, and also has an important effect on mouse insulin sensitivity ( Kharitonenkov A et al, Journal of clinical Investigation, 2005, 115(6): 1627-1635; Coskun T et al, Endocrinology, 2008, 149(12): 6018-6027; Xu J et al, Diabetes, 2009, 58(1): 250-259).
- Exogenous FGF21 in diet-induced obese mice and ob/ob mice can reverse liver hepatic degeneration and enhance hepatic insulin sensitivity (including reducing hepatic glucose production and increasing hepatic glycogen content), thereby improving systemic glucose intolerance Receptivity and insulin resistance (Xu J et al, Diabetes, 2009, 58(1): 250-259; Berglund ED et al, Endocrinology, 2009, 150(9): 4084-4093; Xu J et al, Am J Physiol Endocrinol Metab, 2009, 297(5)E1105-1104).
- FGF21 has the same metabolic regulation in diabetic monkeys, while also reducing LDL cholesterol and increasing HDL cholesterol concentration (Kharitonenkov A et al, Endocrinology, 2007, 148(2): 774-781).
- FGF21 has a very significant beneficial metabolic regulation effect on obese rodent and non-human primates.
- FGF21 which does not rely on insulin to regulate blood glucose levels, does not cause hypoglycemia when administered as a hypoglycemic agent in large doses.
- FGF21 is the only cytokine currently found in the FGF family that does not have mitogenic effects, thereby greatly reducing the risk of side effects in clinical use.
- FGF21 is a potential target for the treatment of obesity, type 2 diabetes and hyperlipidemia.
- natural FGF21 is difficult to be developed into clinical therapeutic biological agents. The main reasons include: 1. FGF21 protein has poor stability and is susceptible to protease hydrolysis or enzymatic degradation; 2. FGF21 conformation is very unstable It is prone to aggregation, low stability also increases the difficulty of FGF21 in large-scale production; 3.
- Natural FGF21 half-life is very short, human FGF21 has a half-life of 0.5-1 hour in mice, and half-life in cynomolgus monkeys 2-3 Hours (Kharitonenkov A et al, Journal of clinical Investigation, 2005, 115: 1627-1635). A variety of protein long-acting techniques have been reported to extend the in vivo half-life of recombinant FGF21.
- FGF21 is linked to a PEG molecule, increasing molecular weight, reducing glomerular filtration rate, and prolonging in vivo retention time (see patents WO2005/091944, WO2006/050247, WO2008/121563 and WO2012/066075); FGF21 and fatty acid long chain fusion ( Ability to bind serum albumin) (see WO2010/084169 and WO2012/010553); or to prepare an agonist antibody that specifically binds to the FGFR or FGFR/ ⁇ -klotho complex to mimic the mechanism of action of FGF21 to activate the FGF/FGFR signaling pathway ( See WO2011/071783, WO2011/130417, WO2012/158704 and WO2012/170438); or FGF21 half-life can be improved by fusion with Fc fragments (see WO2004/110472, WO2005/113606, WO2009/149171, WO2010/042747, WO2010/ 129503, WO2010/129600,
- Fc fusion technology In the field of protein drug long-acting technology, Fc fusion technology is the most widely used because it has fewer clinical side effects (for example, it is not easy to induce an allergic reaction or increase the toxicity of the drug due to prolonged half-life).
- the key to the development of FGF21/Fc long-acting fusion protein drugs lies in the following points: First, can we maintain FGF21 Biological activity.
- the C-terminus of FGF21 contains a binding site for ⁇ -Klotho, and thus fusion of Fc to the C-terminus of FGF21 results in a significant decrease in its activity, while fusion at the N-terminus retains its binding affinity to ⁇ -Klotho to the utmost extent.
- the Fc fragment is mostly fused to the N-terminus of FGF21 (Fc-FGF21); secondly, whether the fusion of Fc can significantly improve the pharmacokinetic properties of FGF21, and effectively extend its half-life to meet clinically twice a week or even once per week.
- the half-life improvement was not significant because the C-terminus of FGF21 in the fusion protein (especially between Pro171 and Ser172) was not protected by Fc and thus susceptible to Degradation occurs by protease attack (Hecht, R et al, PLoS One, 2012, 7: e49345).
- the ideal FGF21Fc fusion protein on the one hand, the anti-proteolytic ability of the C-terminus of FGF21 is enhanced, and a significantly extended half-life is obtained; on the other hand, the binding affinity of the C-terminus of FGF21 to ⁇ -Klotho is not due to the steric hindrance effect of Fc.
- the significant decrease leads to a significant decrease in its activity; at the same time, the introduction of fusion ligands and linker peptides does not increase its immunogenicity and can improve its stability.
- CTP human chorionic gonadotropin
- CTP acts as a linker between the beta subunit and the alpha subunit of follicle stimulating hormone; among the fusion proteins disclosed in WO2005058953A2, CTP is used as a linker for Linking the beta and alpha subunits of the glycoprotein hormone.
- the present inventors did not use CTP as a linker or as an extended half-life part according to the prior art, but instead linked it to a flexible peptide linker (for example, (GGGGS)n) to form a new linker sequence, which was placed between FGF21 and the extended half-life portion (
- a flexible peptide linker for example, (GGGGS)n
- an immunoglobulin Fc fragment but not including the CTP suggested by the prior art, constitutes a novel FGF21 fusion protein, thereby further extending the half-life and maintaining good biological activity and function.
- the object of the present invention is to solve the problems of short half-life, poor stability of FGF21, and to provide a highly glycosylated human FGF21 fusion protein with improved pharmaceutical properties, for example, enhanced proteolytic resistance, prolonged in vivo half-life and reduced aggregation.
- the present invention provides a hyperglycosylated human fibroblast growth factor 21 (hFGF21) fusion protein (hereinafter referred to as hFGF21 fusion protein), which comprises wild type human fibrils from N-terminal to C-terminal.
- hFGF21 hyperglycosylated human fibroblast growth factor 21
- hFGF21 fusion protein which comprises wild type human fibrils from N-terminal to C-terminal.
- Cell growth factor 21 or an analog thereof denoted as hFGF21
- L flexible peptide linker
- CTP carboxy terminal peptide rigid unit of at least one human chorionic gonadotropin beta subunit
- CTP human chorionic gonadotropin beta subunit
- fusion ligands eg, immunoglobulin and its Fc fragment, albumin or transferrin.
- the fusion proteins disclosed herein comprise a hFGF21 wild-type polypeptide, wherein the wild-type hFGF21 polypeptide comprises the sequence set forth in SEQ ID NO: 1 with amino acid leader 1-28 removed; or comprises 1- The amino acid leader peptide of 28 and having the equivalent sequence of SEQ ID NO: 1 substituted with G141S or L174P.
- the fusion proteins disclosed herein comprise an hFGF21 analog, eg, having one or more amino acid deletions, insertions, additions or substitutions relative to its wild-type sequence, and deletion of the N-terminus or C-terminus a truncated form of one or more amino acids; preferably, the hFGF21 analog is at least 70% homologous to the amino acid sequence of wild-type hFGF21; more preferably, the hFGF21 analog is at least 80% identical to the wild-type hFGF21 amino acid sequence More preferably, the hFGF21 analog is at least 90% homologous to the amino acid sequence of wild-type hFGF21. Most preferably, the hFGF21 analog is at least 95% homologous to the amino acid sequence of wild-type hFGF21.
- the flexible peptide linker is preferably non-immunogenic and produces sufficient distance between hFGF21 and the fusion ligand to minimize steric effects between each other.
- a flexible peptide linker comprising two or more amino acids is used and is selected from the group consisting of Gly (G), Ser (S), Ala (A) and Thr (T).
- the flexible peptide linker comprises G and S residues.
- the length of the linker peptide is very important for the activity of the fusion protein.
- the flexible peptide linker amino acid composition has the structural formula of (GS)a(GGS)b(GGGS)c(GGGGS)d, wherein a, b, c and d are greater than or equal to 0. An integer, and a+b+c+d ⁇ 1.
- the peptide linker is selected from the group consisting of:
- the CTP rigid unit is selected from the full length or truncated sequence consisting of amino acids 113 to 145 of the carboxy terminus of human chorionic gonadotropin ⁇ subunit, in particular, the CTP rigid unit comprises SEQ ID NO: 2 or its truncated sequence.
- the CTP rigid unit comprises at least 2 glycosylation sites; for example, in a preferred embodiment of the invention, the CTP rigid unit comprises 2 glycosylation sites, exemplarily, the CTP The rigid unit comprises 10 amino acids of the N-terminus of SEQ ID NO: 2, ie SSSS*KAPPPS*; or the CTP rigid unit comprises 14 amino acids of the C-terminus of SEQ ID NO: 2, ie S*RLPGPS*DTPILPQ; as another example Wherein the CTP rigid unit comprises 3 glycosylation sites, exemplarily, the CTP rigid unit comprises 16 amino acids of the N-terminus of SEQ ID NO: 2, ie SSSS*KAPPPS*LPSPS*R; In an embodiment, the CTP rigid unit comprises four glycosylation sites, exemplarily, the CTP rigid unit comprises 28, 29, 30, 31, 32 or 33 amino acids and begins with human chorionic gonadotropin The 113th, 114th, 115th, 116th, 117th or 118th position of
- the CTP rigid unit comprises 28 amino acids of the N-terminus of SEQ ID NO: 2, namely SSSS*KAPPPS*LPSPS*RLPGPS*DTPILPQ.
- * represents a glycosylation site.
- the CTP rigid units provided herein are at least 70% homologous to the native CTP amino acid sequence; in other embodiments, the CTP rigid units provided herein are at least 80% homologous to the native CTP amino acid sequence; In other embodiments, the CTP rigid units provided herein are at least 90% homologous to the native CTP amino acid sequence; in other embodiments, the CTP rigid units provided herein are at least 95% homologous to the native CTP amino acid sequence.
- the CTP rigid unit of the present invention may preferably comprise the following sequence:
- CTP1 SSSSKAPPPSLPSPSRLPGPSDTPILPQ;
- CTP2 PRFQDSSSSKAPPPSLPSPSRLPGPSDTPILPQ;
- the fusion protein comprises one of the above CTP rigid units.
- the fusion protein of the present invention may further comprise one or more of the above CTP rigid units, preferably comprising 2, 3, 4 or 5 of the above CTP rigid units.
- the fusion protein comprises three CTP3 rigid units: SSSSKAPPPSSSSSKAPPPSSSSSKAPPPS (CTP3-CTP3-CTP3, or expressed as (CTP3) 3 ); in another embodiment of the invention, the fusion The protein comprises two CTP5 rigid units: SSSSKAPPPSLPSPSRSSSSKAPPPSLPSPSR (CTP5-CTP5, or expressed as (CTP5) 2 ).
- the fusion ligand is preferably an immunoglobulin Fc fragment; more preferably, the Fc fragment is preferably an Fc fragment from human immunoglobulin IgG, IgM, IgA and variants thereof; more preferably from human IgG1, IgG2, IgG3 or IgG4 and A variant Fc fragment, wherein the human IgG Fc variant (denoted as vFc) comprises at least one amino acid modification in wild-type human IgG Fc, and the Fc variant is non-lytic and exhibits minimal Fc - mediated adverse side effects (ADCC and CDC effects) and/or enhanced binding affinity to the FcRn receptor.
- ADCC and CDC effects minimal Fc - mediated adverse side effects
- human IgG Fc variant may be selected from the group consisting of:
- vFc ⁇ 1 human IgG1 hinge region, CH2 and CH3 regions containing the Leu234Val, Leu235Ala and Pro331Ser mutations (such as the amino acid sequence set forth in SEQ ID NO: 3);
- vFc ⁇ 2-1 human IgG2 hinge region, CH2 and CH3 region containing the Pro331Ser mutation (such as the amino acid sequence shown in SEQ ID NO: 4);
- vFc ⁇ 2-2 human IgG2 hinge region, CH2 and CH3 region containing the Thr250Gln and Met428Leu mutations (such as the amino acid sequence shown in SEQ ID NO: 5);
- vFc ⁇ 2-3 human IgG2 hinge region, CH2 and CH3 regions (such as the amino acid sequence shown in SEQ ID NO: 6) containing the Pro331Ser, Thr250Gln and Met428Leu mutations.
- vFc ⁇ 4 human IgG4 hinge region, CH2 and CH3 region containing the Ser228Pro and Leu235Ala mutations (such as the amino acid sequence shown in SEQ ID NO: 7).
- the IgG Fc variants provided by the present invention include, but are not limited to, the five variants described in (i) to (v), and may also be Combination or superposition of two types of functional variant mutation sites between IgG isotypes, as described in (iv) above, which is a new one obtained by superimposing the mutation sites in (ii) and (iii) A combined variant of IgG2Fc.
- An Fc variant (vFc) in a fusion protein of the invention which comprises a hinge region, a CH2 and a CH3 region of human IgG such as human IgG1, IgG2 and IgG4.
- This CH2 region contains amino acid mutations at positions 228, 234, 235 and 331 (as determined by the EU counting system). It is believed that these amino acid mutations reduce the effector function of Fc.
- Human IgG2 does not bind to FcyR but shows very weak complement activity.
- An Fc[gamma]2 variant with a Pro331Ser mutation should have a lower complement activity than native Fc[gamma]2 and is still an Fc[gamma]R non-binding element.
- IgG4Fc is defective in the activation of the complement cascade and its binding affinity to Fc ⁇ R is about an order of magnitude lower than that of IgG1.
- the Fc ⁇ 4 variant with the Ser228Pro and Leu235Ala mutations should exhibit minimal effector function compared to native Fc ⁇ 4.
- Fc ⁇ 1 with Leu234Val, Leu235Ala and Pro331Ser mutations also showed reduced effector function compared to native Fc ⁇ 1.
- These Fc variants are more suitable for the preparation of hFGF21 and its analog fusion proteins than native human IgG Fc.
- the 250 and 428 positions contain amino acid mutations that increase the binding affinity of the Fc region to the neonatal receptor FcRn, thereby further extending the half-life (Paul R et al, J Biol Chem, 2004, 279: 6213). – 6216); variants of the above two types of functions are combined or superimposed to obtain new combined variants, which reduce the effector function while prolonging its half-life.
- the Fc variants of the invention comprise, but are not limited to, mutations at several of the above sites, and substitutions at other sites may be introduced such that the Fc has reduced effector function and/or enhanced binding to the FcRn receptor, while still It does not cause a decrease in Fc variant function/activity or cause a poor conformational change.
- Common mutation sites can be found in Shields RL et al, J Biol Chem, 2001, 276(9):6591-604.
- amino acid sequence of the fusion protein is set forth in SEQ ID NO: 8.
- the fusion protein of the present invention is glycosylated; preferably, the fusion protein is glycosylated by expression in mammalian cells; more preferably, the fusion protein is passed through a Chinese hamster ovary cell Glycosylation is achieved by expression.
- a DNA encoding the above fusion protein is provided.
- the DNA sequence of the fusion protein is set forth in SEQ ID NO: 9.
- a carrier is provided.
- This vector contains the above DNA.
- a host cell comprises the vector described above or is transfected with the vector described above.
- the host cell is a CHO derived cell line DXB-11.
- a pharmaceutical composition comprising a pharmaceutically acceptable carrier, excipient or diluent, and an effective amount of the above fusion protein.
- fusion protein for the preparation of a medicament for treating a condition associated with FGF21, for example, obesity, type 1 or type 2 diabetes, pancreatitis, dyslipidemia, non-alcoholic fatty liver disease (NAFLD) Non-alcoholic steatohepatitis (NASH), insulin resistance, hyperinsulinemia, glucose intolerance, hyperglycemia, metabolic syndrome, acute myocardial infarction, hypertension, cardiovascular disease, atherosclerosis, peripheral arteries Disease, stroke, heart failure, coronary heart disease, kidney disease, diabetic complications, neuropathy, conditions associated with severe inactivation or mutation of the insulin receptor.
- a condition associated with FGF21 for example, obesity, type 1 or type 2 diabetes, pancreatitis, dyslipidemia, non-alcoholic fatty liver disease (NAFLD)
- NASH Non-alcoholic steatohepatitis
- insulin resistance hyperinsulinemia, glucose intolerance, hyperglycemia, metabolic syndrome, acute myocardial infarction, hypertension, cardiovascular disease, atherosclerosis, peripheral
- a mammalian cell line such as a CHO-derived cell line
- the mammalian cell in step (a) is a CHO cell; more preferably the CHO-derived cell line DXB-11.
- the hFGF21 fusion protein of the present invention has the following outstanding advantages:
- the hFGF21 fusion protein has an extended half-life of in vivo function.
- the hFGF21 fusion protein was administered for 16 hours.
- the medium and high dose groups significantly improved the glucose utilization level of obese mice.
- the high dose group could significantly improve the glucose of obese mice.
- the hFGF21 fusion protein has long-lasting effect on improving glucose utilization.
- this also demonstrates that the hFGF21 fusion protein has a significantly enhanced anti-proteolytic ability, which is not easily degraded in vivo and reduces or loses activity.
- the fusion protein constructed by the present invention is fused to the C-terminus of FGF21, and the protective effect of Fc reduces the susceptibility to proteolytic enzyme, so the N-terminal Fc fusion protein (Fc-FGF21) reported in the prior art is compared.
- the half-life has been greatly extended.
- the CTP rigid unit contains a glycosyl group, and the negatively charged, highly sialylated CTP rigid unit is able to counteract the clearance of the kidney and further prolong the half-life of the fusion protein.
- the CTP-containing hFGF21 fusion protein has a longer in vivo circulating half-life and higher bioavailability than the CTP-free hFGF21 fusion protein.
- the single-dose pharmacokinetic data showed that the circulating half-life T 1/2 of the 3F/kg hFGF21 fusion protein FP4I in SD rats was 29.81 ⁇ 1.56h, whereas the CTP-free hFGF21 fusion protein.
- the T 1/2 of FP4J is only 22.43 ⁇ 1.45h, which is greatly prolonged compared with the natural half-life of hFGF21 (the circulating half-life in rats is 1-1.5h), which greatly reduces the frequency of administration.
- the C-terminal fusion Fc (FGF21-Fc) of FGF21 often leads to a significant decrease in its activity
- the C-terminal Fc fusion protein constructed by the present invention utilizes a novel linker peptide, the linker peptide Consisting of a flexible peptide and a CTP rigid peptide
- the CTP rigid unit contains a plurality of O-glycosyl side chains, which can form a relatively stable stereo conformation, and can effectively isolate hFGF21 from Fc, thereby minimizing the Fc-induced
- the steric effect allows FGF21 to maintain better biological activity.
- the hFGF21 fusion protein can effectively control the body mass of obese mice induced by high fat diet, improve insulin resistance and hepatic steatosis, and exhibit significant inhibition of obesity.
- CTP is derived from natural human hCG, is non-immunogenic, and is more suitable as a linker peptide than a non-naturally encoded amino acid sequence.
- Fc variants with enhanced binding affinity to neonatal receptor (FcRn) can further extend the half-life of the fusion protein.
- the hFGF21 fusion protein constructed by the present invention exhibits stronger thermal stability during preparation and storage, and has a higher expression level. At the same time, in the highly concentrated preparation, the hFGF21 fusion protein is also less likely to aggregate.
- human FGF21 and hFGF21 refers to a wild type human FGF21 polypeptide and analogs thereof.
- the sequence of the wild-type hFGF21 protein is available from the UNIPERT database under accession number Q9NSA1.
- the precursor protein consists of 209 amino acids, including the signal peptide (amino acids 1-28) and the mature protein (amino acids 29-209).
- a wild-type hFGF21 isoform or allelic form having Pro instead of Leu (position 174 of SEQ ID NO: 1 of the present invention) in a mature protein is known, in particular, from US2001012628A1.
- Another wild type hFGF21 isoform Gly was substituted with Ser (in position 141 of SEQ ID NO: 1 of the present invention).
- Another isoform with a shorter signal peptide (in the present invention, Leu at position 23 of SEQ ID NO: 1) is known from WO 2003/011213 (see SEQ ID NO: 2 in the publication of WO 2003/011213, with 27 amino acid residues) Base signal peptide).
- the wild-type hFGF21 comprises the mature protein partial sequence (amino acids 29-209) shown by SEQ ID NO: 1 and L174P or G141S in place of the isoform-removed leader peptide; in addition, the above-mentioned 27 or 28 is added before these sequences are included.
- the full length sequence of the precursor protein of the amino acid signal peptide is included.
- the hFGF21 analog according to the invention refers to a polypeptide which is or can be deduced or derived from wild type human FGF21, in particular or can be derived from SEQ ID NO: 1, ie by its amino acid sequence modification. Such modifications, modifications, or alterations can include substitutions, deletions, and/or additions of one or more amino acids.
- the term "mutein” or “mutant” is sometimes used herein in place of the term “analog”.
- an amino acid may be added and/or deleted at the C-terminus, N-terminus or internal to the amino acid sequence (the amino acid added inside the sequence may be referred to as an insertion).
- Amino acids are preferably added and/or deleted at the C-terminus and/or the N-terminus, more preferably at the N-terminus.
- An amino acid sequence having a C-terminal or N-terminal deletion may also be referred to as a truncated sequence, which is capable of providing a similar activity to the un truncated form of the mature hFGF21 polypeptide, in some cases better activity This is known in the art and includes forms of N-terminal truncation or C-terminal truncation.
- the N-terminally truncated hFGF21 analog comprises 1, 2, 3, 4, 5, 6, 7 or 8 amino acid residues selected from the N-terminus of the deleted mature hFGF21 polypeptide.
- Peptide. N-terminally truncated hFGF21 polypeptide with less than 9 amino acid residues retains mature hFGF21 polypeptide Reduce the ability of an individual's blood sugar.
- the invention encompasses a truncated form of mature hFGF21 polypeptide or hFGF21 protein having an N-terminal truncation of 1, 2, 3, 4, 5, 6, 7, or 8 amino acid residues. body.
- the C-terminally truncated hFGF21 analog comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 selected from the C-terminus of the mature hFGF21 polypeptide. Or a polypeptide of 12 amino acid residues.
- C-terminal truncated truncated FGF21 polypeptide with less than 13 amino acid residues in an in vitro ELK-luciferase assay (Yie J. et al., FEBS Letts, 2009, 583: 19-24)
- the efficacy is at least 50% of the efficacy of wild-type hFGF21, suggesting that these hFGF21 mutants retain the ability of mature hFGF21 polypeptide to lower blood glucose in an individual.
- the invention encompasses a truncated form having a C-terminal truncation of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12 amino acid residues Mature hFGF21 polypeptide or hFGF21 protein variant.
- an hFGF21 analog is a truncated form of wild-type mature hFGF21 in which the four N-terminal amino acid residues (HPIP) of the mature protein are removed, as disclosed, for example, in WO2006/065582.
- This truncated form is believed to stimulate glucose uptake by mouse 3T3-L1 adipocytes at the same level as wild-type hFGF21.
- the truncated form of hFGF21 has the amino acid sequence shown in SEQ ID NO: 1 at 33-209, designated hFGF21 (HPIP - ).
- hFGF21 is a SEQ ID NO: 1 polypeptide (also referred to as "Met-hFGF21”) having an N-terminal Met.
- the N-terminal Met is added when hFGF21 is expressed in E. coli, see, for example, Table 6 in WO2006/050247.
- hFGF21 analog is the substitution/replacement of one or more amino acids in the hFGF21 wild-type precursor protein set forth in SEQ ID NO: 1, including but not limited to: Q55C, A109T, L126R, G148C , K150R, P158S, S195A, P199G, G202A.
- amino acid sequences containing other modified hFGF21 analogs are disclosed in, for example, WO2003/061712, WO2005/091944, WO2006/028595, WO2006/028714, WO2006/065582, and WO2008/121563.
- CTP is a short peptide derived from the carboxy terminus of the ⁇ -subunit of human chorionic gonadotropin (hCG).
- FSH follicle stimulating hormone
- LH luteinizing hormone
- TSH thyrotropin
- hCG chorionic gonadotropin
- the native CTP contains 37 amino acid residues with four O-glycosylation sites and a terminal sialic acid residue. Negatively charged, highly sialylated CTP is resistant to the clearance of the kidneys, thereby prolonging the half-life of the protein in the body.
- the inventors creatively linked at least one CTP polypeptide to a flexible linker of appropriate length, collectively as a linker peptide, for ligation of hFGF21 with a fusion ligand (eg, an immunoglobulin Fc fragment).
- hFGF21 N-terminal and C-terminal sequences of hFGF21 are critical for their function, and the spatial conformation of hFGF21 is complex and fragile, making it poorly stable, easily degradable and easily polymerized, and then linked to the fusion ligand, and its steric hindrance. The effect can interfere with its correct folding, causing its activity to drop significantly or even be lost, or to produce aggregates more easily.
- a CTP rigid unit between hFGF21 and the Fc variant an equivalent of a rigid linker peptide is added.
- the N-terminally fused hFGF21 does not affect the binding site of the Fc variant and FcRn, thereby affecting the half-life; in addition, the Protein A binding site of Fc is important for the purification step in the preparation process, and the CTP rigid unit is connected to ensure The N-terminally fused hFGF21 also does not "cover" its binding site to protein A.
- the addition of a CTP rigid unit also allows the Fc fragment of about 25 kD size to not interfere with the correct folding of the N-terminally fused hFGF21, resulting in a decrease or loss of its biological activity/function.
- CTP glycosyl side chain can reduce the sensitivity of the linker peptide to proteases, making the fusion protein less susceptible to degradation in the junction region.
- CTP is derived from native human hCG and is not immunogenic, and thus is more suitable for use as a linker peptide than a non-naturally encoded amino acid sequence.
- the Fc element is derived from the constant region Fc fragment of immunoglobulin IgG, which plays an important role in eradicating the immune defense of pathogens.
- the effector function of Fc-mediated IgG is exerted through two mechanisms: (1) binding to cell surface Fc receptors (Fc ⁇ Rs), digestion of pathogens by phagocytosis or cleavage or killer cells via antibody-dependent cellular cytotoxicity (ADCC) pathway , or (2) binding to C1q of the first complement component C1, eliciting a complement-dependent cytotoxicity (CDC) pathway, thereby lysing the pathogen.
- Fc ⁇ Rs cell surface Fc receptors
- ADCC antibody-dependent cellular cytotoxicity
- CDC complement-dependent cytotoxicity
- IgG1 and IgG3 efficiently bind to Fc ⁇ Rs, and the binding affinity of IgG4 to Fc ⁇ Rs is low, and the binding of IgG2 to Fc ⁇ Rs is too low to be determined, so human IgG2 has almost no ADCC effect.
- human IgG1 and IgG3 can also efficiently bind to C1q to activate the complement cascade.
- Human IgG2 binds relatively weakly to C1q, whereas IgG4 does not bind to C1q (Jefferis R et al, Immunol Rev, 1998, 163: 59-76), so the human IgG2 CDC effect is also weak.
- the most effective method is to mutate the complement and receptor binding domain of the Fc fragment, modulate the binding affinity of Fc to related receptors, reduce or eliminate ADCC and CDC effects, and retain only Fc. Long cycle half-life characteristics without cytotoxicity.
- the mutation sites can be found in Shields RL et al, J Biol Chem, 2001, 276(9): 6591-604 or Chinese invention patent CN 201280031137.2.
- Fc variant with enhanced binding affinity to neonatal receptor (FcRn)
- the plasma half-life of IgG depends on its binding to FcRn, which generally binds at pH 6.0 and dissociates at pH 7.4 (plasma pH). By studying the binding sites of the two, the site of binding to FcRn on IgG was engineered to increase the binding ability at pH 6.0. Mutations in some residues of the human Fc ⁇ domain important for binding to FcRn have been shown to increase serum half-life. Mutations in T250, M252, S254, T256, V308, E380, M428 and N434 have been reported to increase or decrease FcRn binding affinity (Roopenian et al, Nat. Rview Immunology 7: 715-725, 2007). Korean Patent No.
- KR10-1027427 discloses variants of trastuzumab (Herceptin, Genentech) having increased FcRn binding affinity, and these variants are selected from the group consisting of 257C, 257M, 257L, 257N, 257Y, 279Q, 279Y.
- Korean Patent Publication No. KR2010-0099179 provides variants of bevacizumab (Avastin, Genentech) and these variants include Amino acid modifications of N434S, M252Y/M428L, M252Y/N434S, and M428L/N434S, showing increased in vivo half-life.
- a condition associated with a severe inactivating mutation of the insulin receptor describes a condition in a subject having a mutation in the insulin receptor (or a protein directly downstream thereof) that causes severe insulin resistance, but usually does not have type 2 Obesity common in diabetes.
- subjects with these conditions exhibit a syndrome of type 1 diabetes and type 2 diabetes. Therefore, the affected subjects are basically divided into several categories according to the severity, including: type A diabetes resistance, type C insulin resistance (AKA HAIR-AN syndrome), Rabson-Mendenhall syndrome, Donohue's syndrome or dwarf disease ( Leprechaunism). These conditions are associated with very high levels of endogenous insulin, leading to elevated blood glucose levels.
- the affected subjects also have a variety of clinical features associated with "insulin toxicity", including androgen excess, polycystic ovary syndrome (PCOS), hirsutism and acanthosis nigricans (skin fold overgrowth and pigmentation).
- PCOS polycystic ovary syndrome
- hirsutism hirsutism
- acanthosis nigricans skin fold overgrowth and pigmentation
- Diabetes complications are dysfunctions in other parts of the body caused by chronic hyperglycemia such as diabetic nephropathy, diabetic neuropathy, diabetic foot (foot ulcer and hypotonic), and ocular lesions (retinopathy). Diabetes also increases the risk of heart disease and bone and joint disorders. Other long-term complications of diabetes include skin problems, digestive problems, sexual dysfunction, and tooth and gum problems.
- metabolic syndrome is a pathological condition in which a variety of metabolic components are abnormally aggregated, including: (1) abdominal obesity or overweight; (2) atherosclerosis dyslipidemia, such as high triglyceride (TG) Hypertension and high-density lipoprotein cholesterol (HDL-C) are low; (3) hypertension; (4) insulin resistance and/or impaired glucose tolerance. Some criteria also include microalbuminuria, hyperuricemia, and pro-inflammatory state (C-reactive protein CRP) and thrombotic state (fibrinogen elevation and plasminogen inhibitor-1, PAI-1) Increase.
- C-reactive protein CRP pro-inflammatory state
- thrombotic state fibrinogen elevation and plasminogen inhibitor-1, PAI-1
- Dyslipidemia is a condition of lipoprotein metabolism, including lipoprotein overproduction or defects. Dyslipidemia can be manifested by an increase in blood total cholesterol, low-density lipoprotein (LDL) cholesterol and triglyceride concentrations, and a decrease in high-density lipoprotein (HDL) cholesterol.
- LDL low-density lipoprotein
- HDL high-density lipoprotein
- Non-alcoholic fatty liver disease is a liver disease unrelated to alcohol consumption and is characterized by hepatic steatosis.
- Non-alcoholic steatohepatitis is a liver disease that is not associated with alcohol consumption and is characterized by hepatic steatosis accompanied by inflammation and fibrosis in the lobule.
- Figure 1 shows SpeI/EcoRI in a PCDNA3.1 expression vector according to an embodiment of the present invention.
- the nucleotide sequence of the fragmented hFGF21 fusion protein and the deduced amino acid sequence are indicated by the ⁇ 1 microglobulin leader peptide (1-19, Marked), hFGF21 (20-200, P substituted L), flexible peptide linker (201-227, Mark), CTP 1 (228-255, to Marked) and vFc (256-478) constitute.
- FIG. 2-a hFGF21 fusion protein FP4I reduction and non-reduction SDS-PAGE electrophoresis results, from left to right band in order: NR (non-reducing); M (protein Marker); R (reductive).
- Figure 2-b Results of FP-HPLC detection of hFGF21 fusion protein FP4I.
- FIG 7, hFGF21 FP4I fusion protein in liver function in mice fed the high fat diet conditions (means ⁇ SEM, n 8 ); statistically different tag Note: Compared with low-fat diet group, # P ⁇ 0.05, # # P ⁇ 0.01; compared with the high fat diet group, * P ⁇ 0.05, ** P ⁇ 0.01.
- FIG. 15 Effect of hFGF21 fusion protein FP4I on liver histopathology of high-fat diet-fed mice; Note: A: low-fat diet group; B: high-fat diet group; C: high-fat diet combined with hFGF21 fusion protein group.
- FIG. 16 Effect of hFGF21 fusion protein FP4I on the pathological morphology of adipose tissue in mice fed with high fat diet; Note: A: low fat diet group; B: high fat diet group; C: high fat diet combined with hFGF21 fusion protein group.
- the fusion proteins of the invention are typically prepared by biosynthetic methods. According to the nucleotide sequence of the present invention, one skilled in the art can conveniently prepare the nucleic acid of the present invention by various known methods. These methods are, for example but not limited to, PCR, DNA synthesis, etc. For specific methods, see J. Sambrook, Molecular Cloning Experiment Guide. As an embodiment of the present invention, the nucleic acid sequence of the present invention can be constructed by a method of segmentally synthesizing a nucleotide sequence and performing overlap extension PCR.
- the invention also provides an expression vector comprising a sequence encoding a fusion protein of the invention and an expression control sequence operably linked thereto.
- operably linked or “operably linked” is meant a condition in which portions of a linear DNA sequence are capable of modulating or controlling the activity of other portions of the same linear DNA sequence. For example, if a promoter controls the transcription of a sequence, then it is operably linked to the coding sequence.
- the expression vector may be a commercially available vector such as, but not limited to, pcDNA3, pIRES, pDR, pUC18 or the like which can be used for expression of a eukaryotic cell system.
- pcDNA3, pIRES, pDR, pUC18 or the like which can be used for expression of a eukaryotic cell system.
- One skilled in the art can select a suitable expression vector based on the host cell.
- the recombinant enzyme expression vector of the present invention is prepared by cleavage and splicing of the enzyme and inserting the coding sequence of the fusion protein of the present invention into a suitable restriction site.
- the invention also provides a host cell expressing a fusion protein of the invention comprising a coding sequence for a fusion protein of the invention.
- the host cell is preferably a eukaryotic cell such as, but not limited to, CHO, COS cells, 293 cells, RSF cells and the like.
- the cell is a CHO cell which can express the fusion protein of the present invention well, and a fusion protein having good binding activity and good stability can be obtained.
- the present invention also provides a method for producing a fusion protein of the present invention using recombinant DNA, the steps of which include:
- Introduction of the coding sequence into a host cell can employ a variety of known techniques in the art such as, but not limited to, calcium phosphate precipitation, protoplast fusion, lipofection, electroporation, microinjection, reverse transcription, phage Transduction method, alkali metal ion method.
- the fusion protein obtained as described above can be purified to a substantially uniform property, such as a single band on SDS-PAGE electrophoresis.
- a commercially available ultrafiltration membrane can be used to separate the protein, for example, from Millipore, Pellicon, etc., and the expression supernatant is first concentrated.
- the concentrate may be further purified by gel chromatography or by ion exchange chromatography. For example, anion exchange chromatography (DEAE, etc.) or cation exchange chromatography.
- the gel matrix may be a matrix commonly used for protein purification such as agarose, dextran, polyamide, and the like.
- the Q- or SP- group is a preferred ion exchange group.
- the purified product may be further purified by hydroxyapatite adsorption chromatography, metal chelate chromatography, hydrophobic interaction chromatography and reversed-phase high performance liquid chromatography (RP-HPLC). All of the above purification steps can utilize different combinations to ultimately achieve a substantially uniform protein purity.
- an affinity chromatography column containing a specific antibody, receptor or ligand of the fusion protein can be used for expression
- the fusion protein was purified.
- the fusion polypeptide bound to the affinity column can be eluted using conventional methods such as high salt buffer, pH change, and the like.
- the amino terminus or carboxy terminus of the fusion protein may also contain one or more polypeptide fragments as a protein tag.
- Any suitable label can be used in the present invention.
- the label may be FLAG, HA, HA1, c-Myc, 6-His or 8-His, and the like. These tags can be used to purify the fusion protein.
- Example 1 Construction of an expression plasmid encoding the hFGF21Fc fusion protein
- the gene sequence encoding the ⁇ 1 microglobulin leader peptide and mature hFGF21 or its analog, flexible peptide linker, CTP rigid unit and human IgG Fc variant are artificially optimized CHO cell-preferred codons, full-length sequence Obtained by chemical synthesis methods.
- the purified fusion protein gene of hFGF21 or its analog was digested with SpeI and EcoRI, and inserted into the corresponding restriction site of plasmid PXY1A1 modified by PCDNA3.1 to obtain a fusion gene expression plasmid.
- This plasmid contains a cytomegalovirus early promoter which is an enhancer required for mammalian cells to express foreign genes at high levels.
- the plasmid also contains a selectable marker to have kanamycin resistance in bacteria and G418 resistance in mammalian cells.
- the PXY1A1 expression vector contains the mouse dihydrofolate reductase (DHFR) gene, thereby co-amplifying the fusion gene and the DHFR gene in the presence of methotrexate (MTX). (See U.S. Patent 4,399,216).
- the present invention constructs a series of fusion proteins of hFGF21 comprising wild-type hFGF21 and its analogs, different lengths of flexible peptide linkers (Linker) and several different subtypes of IgG Fc variants (vFc).
- the components are composed, and the position and length of the CTP rigid unit are also different.
- the nucleotide sequence and translated amino acid sequence of FP4I are shown in FIG. 1 .
- wild-type hFGF21 has the amino acid sequence shown in SEQ ID NO: 1 (denoted as hFGF21) and its isoform L174P hFGF21 (SEQ ID NO: 1 at position 174, Leu is replaced by Pro), and hFGF21 analog is preferred. comprises a truncated wild-type polypeptide hFGF21 hFGF21 (HPIP -), i.e., wild-type N- terminus of the mature protein deleted hFGF21 HPIP (having SEQ ID NO: 1 amino acid sequence of position 33-209).
- the hFGF21 analog also preferably includes a variant in which an amino acid is substituted/substituted, such as variant Q55C, which is obtained by replacing Gln at position 55 of SEQ ID NO: 1 with Cys, and several other variants include A109T, L126R K150R, P199G and G202A are also substituted by the amino acid of the corresponding site of SEQ ID NO: 1.
- the recombinant expression vector plasmid is transfected into a mammalian host cell line to express the hFGF21 fusion protein.
- a preferred host cell line is a DHFR enzyme deficient CHO-cell (see U.S. Patent No. 4,818,679).
- the host cell is selected from the CHO-derived cell line DXB11.
- a preferred method of transfection is electroporation, and other methods, including calcium phosphate co-precipitation, lipofection, can also be used.
- the transfected fusion protein gene was co-amplified with the DHFR gene in growth medium containing increasing concentrations of MTX.
- Subclones with positive dilution DHFR expression were gradually pressurized, and transfectants capable of growing in up to 6 ⁇ M MTX medium were screened, the secretion rate was determined, and a cell line highly expressing the foreign protein was selected.
- a cell line having a secretion rate of more than about 30 (preferably about 50) ⁇ g/10 6 (i.e., millions) of cells per 24 hours is subjected to adaptive suspension culture using serum-free medium, and then purified by conditioned medium. protein.
- the conditioned medium containing the fusion protein was titrated to pH 7-8 with 1 N NaOH and then filtered through a 0.45 micron nitrocellulose filter. The filtrate was loaded onto a phosphate buffered saline (PBS) equilibrated Protein A column. After the fusion protein is bound to the Protein A column, the effluent components are discarded. The column was washed with PBS until the OD value at 280 nm was less than 0.01. The bound fusion protein was then eluted with 0.1 M citrate buffer pH 3.75. The eluate was neutralized with 0.4 volume of 1 M K 2 HPO 4 and the fractions containing the purified protein were combined and dialyzed against PBS.
- PBS phosphate buffered saline
- Example 4 Effect of single injection of hFGF21 fusion protein on glucose utilization rate in obese mice induced by high fat diet
- mice 32 male C57BL/6J mice of SPF grade and 7 weeks old (purchased from Shanghai Slack Laboratory Animal Co., Ltd.) were selected. Breeding environment: temperature 22-25 ° C, relative humidity 45-65%, lighting time 12h / d.
- Mice were randomly divided into 4 groups according to body weight: control group, hFGF21 fusion protein FP4I 2.5 mg/kg group (low dose group), 5 mg/kg group (middle dose group) and 10 mg/kg group (high dose group). The mice in the administration group were subcutaneously injected with the corresponding drug solution, and the control mice were subcutaneously injected with PBS buffer.
- mice in each group were fasted for 16 hours to carry out the glucose tolerance test.
- the fasting blood glucose level of the mice was measured, and 2 g/kg glucose solution was intraperitoneally injected.
- the blood glucose levels after 15 min, 30 min, 60 min, 90 min, and 120 min of glucose injection were measured, and the area under the curve (iAUC) was calculated by the trapezoidal method.
- the mice in each group continued the glucose tolerance test in the same manner as above. Data were expressed as mean ⁇ standard error (means ⁇ SEM) and data were analyzed using SPSS 18.0 statistical software. Normal distribution, one-way ANOVA was used for the mean difference between groups, LSD test was used for variance homogeneity, Dunnet T3 test for variance variance; non-parametric test for non-normal distribution, P ⁇ 0.05 for significant statistics difference.
- hFGF21 fusion protein FP4I significantly improved the glucose utilization level of obese mice at 16 h after administration (P ⁇ 0.05).
- high doses still significantly improved glucose utilization levels in obese mice 48 h after administration (P ⁇ 0.05).
- the experimental results demonstrate that the hFGF21 fusion protein provided by the present invention has long-lasting effect on improving glucose utilization.
- mice induced by high-fat diet were randomly divided into 10 groups (6 in each group): FP4A, FP4B, FP4C, FP4D, FP4E, FP4F, FP4G, FP4H, and FP4J, and the control group.
- the mice in the drug-administered group were injected subcutaneously.
- the corresponding solution was 10 mg/kg, and the control mice were injected subcutaneously with PBS buffer.
- Glucose tolerance experiments were performed at 16 h and 48 h after injection, respectively.
- hFGF21 fusion proteins FP4A, FP4B, FP4C, FP4D, FP4E, FP4F, FP4G, FP4H and FP4J significantly improved glucose utilization in obese mice at 16 h after administration (P ⁇ 0.05).
- Figure 4a hFGF21 fusion proteins FP4A, FP4B, FP4C, FP4D, FP4E, FP4F, FP4G and FP4H significantly improved glucose utilization in obese mice 48 h after administration (P ⁇ 0.05), while FP4J group and control group There is no significant difference in blood glucose (Fig. 4b).
- the hFGF21 fusion protein provided by the present invention has strong anti-proteolytic ability, is not easily degraded in the body, thereby maintaining a long physiological activity, and CTP-containing with respect to CTP-free FP4J.
- the hFGF21 fusion protein FP4I showed a longer functional half-life in vivo, suggesting that the addition of CTP can further extend the in vivo functional half-life of hFGF21.
- the mouse anti-hFGF21 antibody (R&D, product number MAB25373-100) was coated with HRP-labeled goat anti-human IgG-Fc mAb (Jackson, Inc., Cat. No. 109-035-098).
- the data is then input into the analysis software PKSOLVER to obtain the pharmacokinetic parameters T 1/2 and AUC (0-t) of the drug to be tested in the blood.
- Example 6 Experimental study of hFGF21 fusion protein in preventing obesity, nonalcoholic steatosis, insulin resistance and hypercholesterolemia in mice fed with high fat diet
- the high fat diet combined with the FP4I group was injected subcutaneously with FP4I every 4 days at a dose of 3.6 mg/kg, and the low fat diet group and the high fat diet group were subcutaneously injected with PBS buffer for 116 days.
- each group of mice was fasted for 16 hours, weighed and tested for fasting blood glucose, and the whole eye was taken by eyeball, centrifuged at 2000 ⁇ g for 15 min, and serum was separated. The liver tissue was separated, and after washing with physiological saline, the filter paper was blotted and weighed.
- liver tissue Take 2 parts of liver tissue in the same part, 1 part is fixed in 10% formalin solution for HE staining, and the other part of liquid nitrogen is frozen and stored at -80 °C for liver index analysis.
- One side of the epididymal adipose tissue was taken and fixed in a 10% formalin solution for HE staining.
- mice were weighed once every 4 days, and the muscle, fat and body fluid contents of the mice were analyzed by time-domain NMR on the 104th day after the start of the experiment.
- the Ouba XL-200 automatic biochemical analyzer measures the concentrations of ALT, AST, HDL-c, LDL-c, TG and TC in serum, and the specific operation is carried out according to the instrument manual.
- mice in each group were fasted for 6 h (10:00 am-4:00 pm), and the blood glucose levels of each group were measured and weighed.
- the insulin solution was administered by intraperitoneal injection at a lean mass of 0.75 IU/kg.
- the blood glucose levels of the mice at 15 min, 30 min, 60 min, 90 min and 120 min after injection were measured, and the insulin tolerance curve was drawn.
- the AUC area was calculated by the trapezoidal method.
- the fasting serum insulin content of mice was measured by ELISA, and the insulin resistance index was calculated.
- Insulin resistance index fasting blood glucose value (mmol / L) ⁇ fasting insulin content (mIU / L) / 22.5.
- liver triglyceride content 2.4, liver triglyceride content
- mice were accurately weighed 50 mg of liver tissue, and the TG content in liver tissue was measured by Folch method. Results are expressed as TG content per mg of liver tissue.
- liver and adipose tissue of the same part were preserved in 10% formalin solution, and histopathological observation was performed by HE staining.
- the body weight, body mass increase and body fat content of the high-fat diet group increased significantly, showing obvious obesity symptoms.
- the hFGF21 fusion protein can significantly reduce the body mass increase and body fat content under high-fat diet feeding conditions. The results are shown in Figures 5-6.
- mice fed high-fat diet showed significant symptoms of insulin resistance.
- Serum insulin test results further indicate that mice have hyperinsulinemia and insulin resistance.
- the hFGF21 fusion protein can significantly improve the insulin resistance of mice under high-fat diet feeding conditions and alleviate the increase of fasting blood glucose. The results are shown in Figure 10-13.
- the liver tissue of the high-fat diet group showed obvious fatty degeneration, and the lipid droplet vacuoles were clearly visible and fused into a sheet-like structure, and the liver cell morphology was severely damaged.
- the fat cell cross-sectional area is significantly increased.
- the hFGF21 fusion protein significantly attenuated liver tissue steatosis and reduced the fat cell cross-sectional area.
- hFGF21 fusion protein can effectively control the body mass of obese mice induced by high fat diet, improve insulin resistance, relieve liver steatosis and hypercholesterolemia.
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Abstract
Description
Claims (25)
- 人成纤维细胞生长因子21融合蛋白,所述融合蛋白从N端至C端依次包含野生型hFGF21或其类似物、柔性肽接头、至少1个人绒毛膜促性腺激素β亚基羧基末端肽刚性单元和融合配体;其中,融合配体选自免疫球蛋白及其Fc片段、人血清白蛋白和转铁蛋白,优选地,所述融合配体为免疫球蛋白Fc片段。
- 如权利要求1所述的融合蛋白,其特征在于,所述融合蛋白是糖基化的;优选地,所述融合蛋白是通过在哺乳动物细胞中表达而实现糖基化的;更优选地,所述融合蛋白是通过在中国仓鼠卵巢细胞中表达而实现糖基化的。
- 如权利要求1所述的融合蛋白,其特征在于,所述野生型hFGF21包含去除了1-28位氨基酸前导肽的SEQ ID NO:1所示序列;或包含去除了1-28位氨基酸前导肽且具有G141S或L174P取代的SEQ ID NO:1所示同等型序列。
- 如权利要求1所述的融合蛋白,其特征在于,所述hFGF21类似物相对于野生型hFGF21的氨基酸序列具有一个或多个氨基酸缺失、插入、添加或取代,以及缺失N-末端或C-末端的一个或多个氨基酸;优选地,所述hFGF21类似物与野生型hFGF21的氨基酸序列至少70%同源;较优选地,所述hFGF21类似物与野生型hFGF21氨基酸序列至少80%同源;更优选地,所述hFGF21类似物与野生型hFGF21的氨基酸序列至少90%同源;最优选地,所述hFGF21类似物与野生型hFGF21的氨基酸序列至少95%同源。
- 如权利要求4所述的融合蛋白,其特征在于,所述hFGF21类似物缺失N-末端的1、2、3、4、5、6、7或8个氨基酸残基。
- 如权利要求5所述的融合蛋白,其特征在于,所述hFGF21类似物缺失N-末端4个氨基酸HPIP。
- 如权利要求4所述的融合蛋白,其特征在于,所述hFGF21类似物缺失C-末端1、2、3、4、5、6、7、8、9、10、11或12个氨基酸残基。
- 如权利要求4所述的融合蛋白,其特征在于,所述hFGF21类似物包含选自Q55C、A109T、L126R、G148C、K150R、P158S、S195A、P199G和G202A的一个或多个氨基酸的取代。
- 如权利要求1所述的融合蛋白,其特征在于,所述柔性肽接头含有2个或更多个选自G、S、A和T的氨基酸。
- 如权利要求9所述的融合蛋白,其特征在于,所述柔性肽接头氨基酸组成的 结构通式为(GS)a(GGS)b(GGGS)c(GGGGS)d,其中a,b,c和d是大于或等于0的整数,且a+b+c+d≥1。
- 如权利要求10所述的融合蛋白,其特征在于,所述柔性肽接头的氨基酸选自如下序列:(i)GGGGS;(ii)GSGGGSGGGGSGGGGS;(iii)GSGGGGSGGGGSGGGGSGGGGSGGGGS;(iv)GGGGSGGGGSGGGGSGGGGSGGGGSGGGGSGGGGS;(v)GGGSGGGSGGGSGGGSGGGS;(vi)GGSGGSGGSGGS。
- 如权利要求1所述的融合蛋白,其特征在于,所述人绒毛膜促性腺激素β亚基的羧基末端肽刚性单元包含SEQ ID NO:2或其截短的序列;其中,所述截短的序列包含至少2个糖基化位点。
- 如权利要求12所述的融合蛋白,其特征在于,所述人绒毛膜促性腺激素β亚基的羧基末端肽刚性单元包含以下氨基酸序列:(i)SSSSKAPPPSLPSPSRLPGPSDTPILPQ;(ii)PRFQDSSSSKAPPPSLPSPSRLPGPSDTPILPQ;(iii)SSSSKAPPPS;(iv)SRLPGPSDTPILPQ;(v)SSSSKAPPPSLPSPSR。
- 如权利要求1所述的融合蛋白,其特征在于,所述人绒毛膜促性腺激素β亚基的羧基末端肽刚性单元与权利要求13所述融合蛋白中的CTP氨基酸序列至少具有70%,80%,90%或95%的同一性。
- 如权利要求1所述的融合蛋白,其特征在于,所述融合蛋白包含1、2、3、4或5个人绒毛膜促性腺激素β亚基的羧基末端肽刚性单元。
- 如权利要求1所述融合蛋白,其特征在于,所述人免疫球蛋白Fc片段为具有降低的ADCC效应和/或CDC效应和/或与FcRn受体的结合亲和力增强的变体。
- 如权利要求16所述融合蛋白,其特征在于,所述Fc片段选自人IgG Fc变 体;更优选地,所述人IgG Fc变体选自:(i)含有Leu234Val、Leu235Ala和Pro331Ser突变的人IgG1绞链区、CH2和CH3区域;(ii)含有Pro331Ser突变的人IgG2绞链区、CH2和CH3区域;(iii)含有Thr250Gln和Met428Leu突变的人IgG2绞链区、CH2和CH3区域;(iv)含有Pro331Ser、Thr250Gln和Met428Leu突变的人IgG2绞链区、CH2和CH3区域;(v)含有Ser228Pro和Leu235Ala突变的人IgG4绞链区、CH2和CH3区域。
- 如权利要1所述的融合蛋白,其特征在于,所述融合蛋白的氨基酸序列如SEQ ID NO:8。
- 编码如权利要求1-18中任一项所述融合蛋白的DNA分子。
- 如权利要求19所述的DNA分子,其特征在于,所述DNA分子包含如SEQ ID NO:9所示的序列。
- 一种载体,其特征在于,包含如权利要求19或20所述的DNA分子。
- 一种宿主细胞,其特征在于,包含如权利要求21所述的载体,或者转染了权利要求19或20所述DNA分子的载体。
- 一种药物组合物,其特征在于,包括药学上可接受的载体、赋形剂或稀释剂,以及有效剂量的如权利要求1-18中任一项所述的融合蛋白。
- 一种制备如权利要求1-18中任一项所述融合蛋白的方法,所述方法包括:(a)将权利要求19或20所述编码融合蛋白的DNA序列引入哺乳动物细胞;(b)筛选步骤(a)中在其生长培养基中每24小时期间内,表达超过50μg/106(百万)个细胞的高产细胞株;(c)培养步骤(b)筛选到的细胞株,表达融合蛋白;(d)收获步骤(c)中得到的发酵液,纯化融合蛋白;优选地,所述步骤(a)中的哺乳动物细胞为CHO细胞;更优选地,所述哺乳动物细胞为CHO衍生细胞系DXB-11。
- 如权利要求1-18中任一项所述的融合蛋白在制备用于治疗肥胖、1型或2型糖尿病、胰腺炎、血脂异常、非醇型脂肪肝病(NAFLD)、非醇型脂肪性肝炎 (NASH)、胰岛素耐受、高胰岛素血症、葡萄糖不耐受、高血糖、代谢综合征、急性心肌梗塞、高血压、心血管病、动脉粥样硬化、外周动脉病、中风、心脏衰竭、冠心病、肾病、糖尿病并发症、神经病、与胰岛素受体的严重失活或突变相关的病症药物中的用途。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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EP17840761.5A EP3620474A4 (en) | 2016-08-19 | 2017-04-10 | HUMAN FIBROBLAST GROWTH FACTOR 21 (HFGF21) FUSION PROTEIN, METHOD OF MANUFACTURING IT AND USES THEREOF |
CA3059662A CA3059662C (en) | 2016-08-19 | 2017-04-10 | Human fibroblast growth factor 21 (hfgf21) fusion protein, preparation method therefor, and use thereof |
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MX2019012081A MX2019012081A (es) | 2016-08-19 | 2017-04-10 | Proteina de fusion del factor de crecimiento 21 de fibroblastos humanos (hfgf21), metodo de preparacion de la misma y su uso. |
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CN107759694A (zh) | 2018-03-06 |
US20210380654A1 (en) | 2021-12-09 |
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CN110229238B (zh) | 2020-10-09 |
RU2736339C9 (ru) | 2021-05-28 |
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CN106317226B (zh) | 2017-09-05 |
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CN107759697B (zh) | 2023-03-24 |
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CN106317226A (zh) | 2017-01-11 |
CN107759697A (zh) | 2018-03-06 |
EP3620474A1 (en) | 2020-03-11 |
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