US20030191056A1 - Use of transthyretin peptide/protein fusions to increase the serum half-life of pharmacologically active peptides/proteins - Google Patents
Use of transthyretin peptide/protein fusions to increase the serum half-life of pharmacologically active peptides/proteins Download PDFInfo
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- US20030191056A1 US20030191056A1 US10/117,109 US11710902A US2003191056A1 US 20030191056 A1 US20030191056 A1 US 20030191056A1 US 11710902 A US11710902 A US 11710902A US 2003191056 A1 US2003191056 A1 US 2003191056A1
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- ttr
- biologically active
- active agent
- peg
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- A—HUMAN NECESSITIES
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- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P3/00—Drugs for disorders of the metabolism
- A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
- A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P5/00—Drugs for disorders of the endocrine system
- A61P5/18—Drugs for disorders of the endocrine system of the parathyroid hormones
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P7/00—Drugs for disorders of the blood or the extracellular fluid
- A61P7/04—Antihaemorrhagics; Procoagulants; Haemostatic agents; Antifibrinolytic agents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
- A61P9/12—Antihypertensives
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
- C07K2319/31—Fusion polypeptide fusions, other than Fc, for prolonged plasma life, e.g. albumin
Definitions
- Proteins, peptides and other drug molecules for therapeutic use are currently available in suitable forms in adequate quantities largely as a result of the advances in recombinant DNA technologies.
- the availability of such peptides and proteins has engendered advances in protein formulation and chemical modification.
- Chemical modification of biologically active peptides, proteins, oligonucleotides and other drugs for purposes of extending the serum half-life of such bioactive agents has been extensively studied. The ability to extend the serum half-life of such agents allows for the therapeutic potential of the agent to be realized without the need for high dosages and frequent administration.
- Chemical modification used to extend the half-lives of proteins in vivo includes the chemical conjugation of a water soluble polymer, such as polyethylene glycol (PEG), to the protein of interest.
- PEG polyethylene glycol
- a variety of approaches have been used to attach the polyethylene glycol molecules to the protein (PEGylation).
- Royer U.S. Pat. No. 4,002,531 states that reductive alkylation was used for attachment of polyethylene glycol molecules to an enzyme.
- Davis et al. U.S. Pat. No. 4,179,337) disclose PEG:protein conjugates involving, for example, enzymes and insulin. Shaw (U.S. Pat. No.
- Hakimi et al. disclose substantially non-immunogenic water soluble PEG:protein conjugates, involving for example, the proteins IL-2, interferon alpha, and IL-1ra.
- the methods of Hakimi et al. involve the utilization of unique linkers to connect the various free amino groups in the protein to PEG.
- Kinstler et al. (U.S. Pat. Nos. 5,824,784 and 5,985,265) teach methods allowing for selectively N-terminally chemically modified proteins and analogs thereof, including G-CSF and consensus interferon.
- Transthyretin (formerly called prealbumin) is a 56 kDa tetrameric serum protein that plays important physiological roles as a transporter of thyroxine and retinol-binding protein; Hamilton and Benson, Cell. Mol. Life Sci., 58:1491-1521 (2001), and references cited therein.
- TTR Transthyretin
- Blaney et al. in U.S. Pat. No. 5,714,142, describe the exploitation of TTR by endowing the drug to be administered with functionality that allows it to bind specifically to the protein. Specifically, Blaney et al.
- TTR or a TTR variant
- a TTR or TTR variant which has been chemically modified via conjugation to a water soluble polymer e.g., can be used as a fusion partner with a biologically active agent to increase the serum half-life of the biologically active agent.
- the present invention provides a means for increasing the serum half-life of a selected biologically active agent.
- the present invention thus relates to substantially homogenous preparations of TTR (or a TTR variant)-biologically active agent fusions and PEG-TTR (PEG-TTR variant)-biologically active agent fusions.
- TTR or a TTR variant
- PEG-TTR PEG-TTR variant
- the TTR-biologically active agent fusion and/or PEG-TTR-biologically active agent fusion has substantially increased serum half-life.
- the present invention further relates to TTR-biologically active agent fusions and PEG-TTR-biologically active agent fusions, in a pharmaceutically acceptable carrier, to provide a pharmacologically active compound.
- the present invention further relates to the preparation of TTR variants.
- TTR proteins are modified such that cysteine residue(s) are engineered into the TTR protein sequence.
- the TTR variants are recoverable in high yield and are then chemically modified via conjugation of a water soluble polymer at the cysteine residue to provide a chemically modified TTR variant which can then be fused to a selected biologically active agent.
- the present invention further relates to processes for preparing pharmacologically active compounds.
- the principal embodiment of the method for making the substantially homogenous preparation of a PEG-TTR-peptide fusion comprises: (a) engineering a cysteine residue into a specific amino acid position within the amino acid sequence of said TTR to provide a variant of said TTR; (b) conjugating a polyethylene glycol to said TTR variant at said cysteine residue to provide a PEG-TTR; (c) fusing said PEG-TTR to a peptide of interest to provide a PEG-TTR-peptide fusion; and (d) isolating said PEG-TTR-peptide fusion.
- the present invention also relates to methods of treatment of individuals using the pharmacologically active compounds as above.
- FIG. 1 is an SDS gel that depicts the purification of an E. coli expressed, recombinant human transthyretin (TTR) variant (C10A/G83C) with a Bradykinin peptide fused to the C-terminus of TTR.
- Lane 1 contains Novex Mark 12 molecular weight standards, and lanes 2-7 contain the following respectively: cell lysate, post-heating supernatant, pool from Q-sepharose chromatography step, pool from phenyl sepharose chromatography step, pool from hydroxyapatite chromatography step, and pool from source Q chromatography step.
- FIG. 2 demonstrates by size exclusion chromatography that fusion of peptides to the amino-terminus or carboxy-terminus of a TTR variant, TTR(C10A/G83C), does not alter its oligomeric structure.
- Solid line is TTR(C10A/G83C)
- dashed line is PTH fused to the amino-terminus of TTR(C10A/G83C)
- the dotted line is Bradykinin fused to the carboxy-terminus of TTR(C10A/G83C).
- FIG. 3 demonstrates by size exclusion chromatography that fusion of proteins to the amino-terminus or carboxy-terminus of a TTR variant, TTR(C10A), does not alter its oligomeric structure.
- Solid line is TTR(C10A)
- dashed line is IL-1-ra fused to the carboxy-terminus of TTR(C10A)
- the dotted line is IL-1-ra fused to the amino-terminus of TTR(C10A).
- FIG. 4 shows the binding observed using BIAcore of various TPO-mimetic peptide (TMP) constructs to human MPL receptor: ⁇ Fc-TMP, ⁇ TMP(m)-TTR, ⁇ TMP(m)-TTR-PEG5K, ⁇ TMP(m)-TTR-PEG20K.
- TMP TPO-mimetic peptide
- FIG. 5 shows that injection of TMP(m)-TTR-PEG5K induces platelet formation in mice.
- the following symbols correspond to the following constructs: ⁇ Carrier, ⁇ FC-TMP, ⁇ TTR-TMP, ⁇ TMP(m)-TTR, and ⁇ TMP(m)-TTR-PEG5K.
- FIG. 6 demonstrates by size exclusion chromatography that native TTR and TTR(C10A) maintain a similar oligomeric configuration (an apparent tetramer). Solid line is native TTR and the dashed line is TTR(C10A).
- FIG. 7 demonstrates by size exclusion chromatography that conjugation of PEG to TTR increases its molecular size in a predictable uniform manner. Solid lines indicate no PEG conjugated, dashed lines indicate 5K PEG fused, and dotted lines indicate 20K PEG fused. The following constructs were used: A) TMP-TTR(C10A/A37C), B) TMP-TTR(C10A/D38C), C) TMP-TTR(C10A/A81C), and D) TMP-TTR(C10A/G83C).
- FIG. 8 is an SDS gel that depicts the extent of pegylation of various TMP-TTR constructs involving TTR variants having a non-native cysteine engineered in at one of four different locations.
- Lane 1 contains Novex Mark 12 molecular weight standards;
- lane 2 is unpegylated TMP-TTR(C10A/A37C);
- lanes 3-6 are 5K pegylated versions of TMP-TTR(C10A/A37C), TMP-TTR(C10A/D38C), TMP-TTR(C10A/A81C), and TMP-TTR(C10A/G83C) respectively;
- lanes 7-10 are 20K pegylated versions of TMP-TTR(C10A/A37C), TMP-TTR(C10A/D38C), TMP-TTR(C10A/A81C), and TMP-TTR(C10A/G83C), respectively.
- FIG. 9 compares the competitive binding of Fc-TMP and TMP-TTR to human MPL by BIAcore analysis.
- FIG. 10 shows that injection of TMP-TTR with PEG conjugated to engineered cysteines induces platelet formation in mice.
- TTR(C10A), ⁇ Fc-TMP 5K pegylated versions of TMP-TTR(C10A/A37C) ( ⁇ ), TMP-TTR(C10A/D38C) ( ⁇ ), TMP-TTR(C10A/A81C) ( ⁇ ), TMP-TTR(C10A/G83C) ( ).
- biologically active agent refers to any chemical material or compound useful for prophylactic, therapeutic or diagnostic application.
- pharmaceutically active compound refers to a compound suitable for administration to a mammalian, preferably a human individual, which induces a desired local or systemic effect.
- peptide As used to describe biologically active agents herein are used interchangeably to refer to a naturally occurring, recombinantly produced or chemically synthesized polymer of amino acids. The terms are intended to include peptide molecules containing as few as 2 amino acids, chemically modified polypeptides, consensus molecules, analogs, derivatives or combinations thereof.
- peptides may be used in conjunction with the present invention.
- peptides that mimic the activity of EPO, TPO, growth hormone, G-CSF, GM-CSF, IL-1ra, leptin, CTLA4, TRAIL, TGF- ⁇ , and TGF- ⁇ .
- the terms “-mimetic peptide” and “-agonist peptide” refer to a peptide having biological activity comparable to a protein (e.g., EPO, TPO, G-CSF) that interacts with a protein of interest. These terms further include peptides that indirectly mimic the activity of a protein of interest, such as by potentiating the effects of the natural ligand of the protein of interest.
- EPO-mimetic peptide comprises any peptides that can be identified or derived as having EPO-mimetic subject matter; see, for example, Wrighton et al., Science, 273:458-63 (1996); and Naranda et al., Proc. Natl. Acad. Sci. USA 96:7569-74 (1999).
- Wrighton et al. Science, 273:458-63 (1996); and Naranda et al., Proc. Natl. Acad. Sci. USA 96:7569-74 (1999).
- TPO-mimetic peptide comprises peptides that can be identified or derived as having TPO-mimetic subject matter; see, for example, Cwirla et al., Science, 276:1696-9 (1997); U.S. Pat. Nos. 5,869,451 and 5,932,946; and PCT WO 00/24782 (Liu et al, and references cited therein), hereby incorporated by reference in its entirety. Those of ordinary skill in the art appreciate that each of these references enables one to select different peptides than actually disclosed therein by following the disclosed procedures with different peptide libraries.
- G-CSF-mimetic peptide comprises any peptides that can be identified as having G-CSF-mimetic subject matter; see, for example, Paukovits et al., Hoppe - Seylers Z. Physiol. Chem. 365:303-11 (1984). Those of ordinary skill in the art appreciate that each of these references enables one to select different peptides than actually disclosed therein by following the disclosed procedures with different peptide libraries.
- CTLA4-mimetic peptide comprises any peptides that can be identified or derived as described in Fukumoto et al., Nature Biotech. 16:267-70 (1998). Those of ordinary skill in the art appreciate that each of these references enables one to select different peptides than actually disclosed therein by following the disclosed procedures with different peptide libraries.
- Peptide antagonists are also of interest, particularly those antagonistic to the activity of TNF, leptin, any of the interleukins, and proteins involved in complement activation (e.g., C3b).
- the term “-anatgonist peptide” or “inhibitor peptide” refers to a peptide that blocks or in some way interferes with the biological activity of the associated protein of interest, or has biological activity comparable to a known antagonist or inhibitor of the associated protein of interest.
- the term “TNF-antagonist peptide” comprises peptides that can be identified or derived as having TNF-antagonistic subject matter; see, foe example, Takasaki et al., Nature Biotech., 15:1266-70 (1997).
- IL-1 antagonist and “IL-1ra-mimetic peptide” comprises peptides that inhibit or down-regulate activation of the IL-1 receptor by IL-1.
- IL-1 receptor activation results from formation of a complex among IL-1, IL-1 receptor, and IL-1 receptor accessory protein.
- IL-1 antagonist or IL-1ra-mimetic peptides bind to IL-1, IL-1 receptor, or IL-1 receptor accessory protein and obstruct complex formation among any two or three components of the complex.
- Exemplary IL-1 antagonist or IL-1ra-mimetic peptides can be identified or derived as described in U.S. Pat. Nos. 5,608,035, 5,786,331, 5,880,096. Those of ordinary skill in the art appreciate that each of these references enables one to select different peptides than actually disclosed therein by following the disclosed procedures with different peptide libraries.
- VEGF-antagonist peptide comprises peptides that can be identified or derived as having VEGF-antagonistic subject matter; see, for example, Fairbrother, Biochem., 37:17754-64 (1998). Those of ordinary skill in the art appreciate that each of these references enables one to select different peptides than actually disclosed therein by following the disclosed procedures with different peptide libraries.
- MMP inhibitor peptide comprises peptides that can be identified or derived as having MMP inhibitory subject matter; see, for example, Koivunen, Nature Biotech., 17:768-74 (1999). Those of ordinary skill in the art appreciate that each of these references enables one to select different peptides than actually disclosed therein by following the disclosed procedures with different peptide libraries.
- Targeting peptides are also of interest, including tumor-homing peptides, membrane-transporting peptides, and the like.
- Exemplary peptides may be randomly generated by various techniques known in the art.
- solid phase synthesis techniques are well known in the art, and include those described in Merrifield, Chem. Polypeptides, pp. 335-61 (Katsoyannis and Panayotis eds.)(1973); Merrifield, J. Am. Chem. Soc., 85:2149 (1963); Davis et al., Biochem. Intl., 10:394-414 (1985); Stewart and Young, Solid Phase Peptide Synthesis (1969); U.S. Pat. No.
- Solid phase synthesis is the preferred technique of making individual peptides since it is the most cost-effective method of making small peptides.
- Phage display is another useful method in generating peptides for use in the present invention. It has been stated that affinity selection from libraries of random peptides can be used to identify peptide ligands for any site of any gene product; Dedman et al., J. Biol. Chem., 268:23025-30 (1993). Phage display is particularly well suited for identifying peptides that bind to such proteins of interest as cell surface receptors or any proteins having linear epitopes; Wilson et al., Can. J. Microbiol., 44:313-29 (1998); Kay et al., Drug Disc. Today, 3:370-8 (1998). Such proteins are extensively reviewed in Herz et al., J. Receptor & Signal Transduction Res., 17(5):671-776 (1997), which is hereby incorporated by reference.
- the peptides may also be made in transformed host cells using recombinant DNA techniques. To do so, a recombinant DNA molecule coding for the peptide is prepared. Methods of preparing such DNA and/or RNA molecules are well known in the art. For instance, sequences coding for the peptides could be excised from DNA using suitable restriction enzymes. The relevant sequences can be created using the polymerase chain reaction (PCR) with the inclusion of useful restriction sites for subsequent cloning. Alternatively, the DNA/RNA molecule could be synthesized using chemical synthesis techniques, such as the phosphoramidite method. Also, a combination of these techniques could be used.
- Additional biologically active agents contemplated for use include recombinant or naturally occurring proteins, whether human or animal, hormones, cytokines, hematopoietic factors, growth factors, antiobesity factors, trophic factors, anti-inflammatory factors, and enzymes.
- proteins would include but are not limited to interferons (see, U.S. Pat. Nos. 5,372,808, 5,541,293 4,897,471, and 4,695,623 hereby incorporated by reference including drawings), interleukins (see, U.S. Pat. No. 5,075,222, hereby incorporated by reference including drawings), erythropoietins (see, U.S. Pat. Nos.
- IL-1ra interleukin-1 receptor antagonist
- OB protein leptin
- biologically active agents can also include but are not limited to insulin, gastrin, prolactin, adrenocorticotropic hormone (ACTH), thyroid stimulating hormone (TSH), luteinizing hormone (LH), follicle stimulating hormone (FSH), human chorionic gonadotropin (HCG), motilin, interferons (alpha, beta, gamma), interleukins (IL-1 to IL-12), tumor necrosis factor (TNF), tumor necrosis factor-binding protein (TNF-bp), brain derived neurotrophic factor (BDNF), glial derived neurotrophic factor (GDNF), neurotrophic factor 3 (NT3), fibroblast growth factors (FGF), neurotrophic growth factor (NGF), bone growth factors such as osteoprotegerin (OPG), insulin-like growth factors (IGFs), macrophage colony stimulating factor (M-CSF), granulocyte macrophage colony stimulating factor (GM-CSF), megakaryocyte derived growth factor (MGDF
- Transthyretin contemplated for use in the present invention will have the DNA and amino acid sequences of TTR as reported in Mita et al., Biochem. Biophys. Res. Commun., 124(2):558-564 (1984). These sequences have been deposited in Genbank as accession number K02091.
- the 127 amino acid TTR sequence used herein does not include the signal sequence (amino acids 1-20) of the K02091 sequence and is depicted below as SEQ ID NO:1.
- TTR variant refers to a molecule or sequence that is a modified form a native TTR.
- a native TTR comprises sites that may be removed because they provide structural features or biological activity that are not required for the fusion molecules of the present invention.
- TR variant comprises a molecule or sequence that lacks one or more native TTR sites or residues or that has had one or more native TTR sites or residues replaced with a different amino acid or that has had one or more residues added to the sequence.
- TTR variant wherein the Alanine residue at amino acid sequence position 37 has been replaced with a Cysteine residue
- TTR variant A37C
- TTR variant A37C/G83C
- a preferred TTR or TTR variant may be chemically modified using water soluble polymers such as polyethylene glycol (PEG).
- PEG polyethylene glycol
- the PEG group may be of any convenient molecular weight and may be straight chain or branched.
- the average molecular weight of the PEG will preferably range from about 2 kDa to about 100 kDa, more preferably from about 5 kDa to about 50 kDa, most preferably about 20 kDa.
- the PEG groups will generally be attached to the compounds of the invention via acylation, reductive alkylation, Michael addition, thiol alkylation or other chemoselective conjugation/ligation methods through a reactive group on the peg moiety (e.g., an aldehyde, amino, ester, thiol, -haloacetyl, maleimido or hydrazino group) to a reactive group on the target compound (e.g., an aldehyde, amino, ester, thiol, -haloacetyl, maleimido or hydrazino group).
- a reactive group on the peg moiety e.g., an aldehyde, amino, ester, thiol, -haloacetyl, maleimido or hydrazino group
- a reactive group on the target compound e.g., an aldehyde, amino, ester, thiol, -haloacetyl
- water soluble polymers used include copolymers of ethylene glycol/propylene glycol, carboxymethylcellulose, polyvinyl alcohol, polyvinyl pyrrolidone, poly-1,3-dioxolane, poly-1,3,6-trioxane, ethylene/maleic anhydride copolymer, polyaminoacids (either homopolymers or random copolymers), and dextran.
- a DNA molecule encoding the peptide of interest, protein of interest, TTR or TTR variant can be prepared using well known recombinant DNA technology methods such as those set forth in Sambrook et al. ( Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y. [1989]) and/or Ausubel et al., eds, Current Protocols in Molecular Biology, Green Publishers Inc. and Wiley and Sons, NY (1994).
- a gene or cDNA encoding the protein of interest or fragment thereof may be obtained for example by screening a genomic or cDNA library with a suitable probe.
- Suitable probes include, for example, oligonucleotides, cDNA fragments, or genomic DNA fragments, that are expected to have some homology to the gene encoding the protein of interest, such that the probe will hybridize with the gene encoding the protein of interest under selected hybridization conditions.
- An alternate means of screening a DNA library is by polymerase chain reaction “PCR” amplification of the gene encoding the protein of interest. PCR is typically accomplished using oligonucleotide “primers” which have a sequence that is believed to have sufficient homology to the gene to be amplified such that at least a sufficient portion of the primer will hybridize with the gene.
- a gene encoding the peptide of interest or protein of interest may be prepared by chemical synthesis using methods well known to the skilled artisan such as those described by Engels et al., Angew. Chem. Intl. Ed., 28:716-734 (1989). These methods include, inter alia, the phosphotriester, phosphoramidite, and H-phosphonate methods for nucleic acid synthesis. A preferred method for such chemical synthesis is polymer-supported synthesis using standard phosphoramidite chemistry.
- the DNA encoding the protein of interest will be several hundred nucleotides in length. Nucleic acids larger than about 100 nucleotides can be synthesized as several fragments using these methods.
- the fragments can then be ligated together to form a gene coding for the full length protein of interest.
- the DNA fragment encoding the amino terminus of the polypeptide will have an ATG, which encodes a methionine residue.
- This methionine may or may not be present on the mature form of the protein of interest.
- the methionine can be removed inside the cell or during the process of secretion.
- Preferred TTR polypeptides may include TTR with the nucleic acid sequence altered to optimize expression in E. coli and to introduce convenient restriction sites. A general discussion of codon optimization for expression in E. coli is described in Kane, Curr. Opin. Biotechnol., 6:494-500 (1995).
- the genes encoding the protein of interest and the TTR polypeptide may be modified using standard methods to create restriction endonuclease sites at the 5′ and/or 3′ ends. Creation of the restriction sites permits the genes to be properly inserted into amplification and/or expression vectors. Addition of restriction sites is typically accomplished using PCR, where one primer of each PCR reaction typically contains, inter alia, the nucleotide sequence of the desired restriction site.
- the gene or cDNA encoding the peptide of interest, or protein of interest can be inserted into an appropriate expression vector for expression in a host cell.
- the vector is selected to be functional in the particular host cell employed (i.e., the vector is compatible with the host cell machinery such that amplification and/or expression of the gene encoding the protein of interest can occur).
- the vectors used in any of the host cells will contain a promoter (also referred to as a “5′ flanking sequence”) and other regulatory elements as well such as an enhancer(s), an origin of replication element, a transcriptional termination element, a ribosome binding site element, a polylinker region for inserting the nucleic acid encoding the polypeptide to be expressed, and a selectable marker element.
- a promoter also referred to as a “5′ flanking sequence”
- other regulatory elements such as an enhancer(s), an origin of replication element, a transcriptional termination element, a ribosome binding site element, a polylinker region for inserting the nucleic acid encoding the polypeptide to be expressed, and a selectable marker element.
- the vector may contain a “tag” DNA sequence, i.e., an oligonucleotide sequence located at either the 5′ or 3′ end of the fusion DNA construct.
- the tag DNA encodes a molecule such as hexaHis, c-myc, FLAG (Invitrogen, San Diego, Calif.) or another small immunogenic sequence. When placed in the proper reading frame, this tag will be expressed along with the fusion protein, and can serve as an affinity tag for purification of the fusion protein from the host cell. Optionally, the tag can subsequently be removed from the purified fusion protein by various means such as using a selected peptidase for example.
- the promoter may be homologous (i.e., from the same species and/or strain as the host cell), heterologous (i.e., from a species other than the host cell species or strain), hybrid (i.e., a combination of promoters from more than one source), synthetic, or it may be the native protein of interest promoter. Further, the promoter may be a constitutive or an inducible promoter. As such, the source of the promoter may be any unicellular prokaryotic or eukaryotic organism, any vertebrate or invertebrate organism, or any plant, provided that the promoter is functional in, and can be activated by, the host cell machinery.
- the promoters useful in the vectors of this invention may be obtained by any of several methods well known in the art. Typically, promoters useful herein will have been previously identified by mapping and/or by restriction endonuclease digestion and can thus be isolated from the proper tissue source using the appropriate restriction endonucleases. In some cases, the full nucleotide sequence of the promoter may be known. Here, the promoter may be synthesized using the methods described above for nucleic acid synthesis or cloning.
- the complete promoter may be obtained using PCR and/or by screening a genomic library with suitable oligonucleotide and/or 5′ flanking sequence fragments from the same or another species.
- Suitable promoters for practicing this invention are inducible promoters such as the lux promoter, the lac promoter, the arabinose promoter, the trp promoter, the tac promoter, the tna promoter, synthetic lambda promoters (from bacteriophage lambda), and the T5 or T7 promoters.
- Preferred promoters include the lux, and lac promoters.
- the origin of replication element is typically a part of prokaryotic expression vectors whether purchased commercially or constructed by the user. In some cases, amplification of the vector to a certain copy number can be important for optimal expression of the protein or polypeptide of interest. In other cases, a constant copy number is preferred. In any case, a vector with an origin of replication that fulfills the requirements can be readily selected by the skilled artisan. If the vector of choice does not contain an origin of replication site, one may be chemically synthesized based on a known sequence, and ligated into the vector.
- the transcription termination element is typically located 3′ of the end of the fusion protein DNA construct, and serves to terminate transcription of the RNA message coding for the fusion polypeptide.
- the transcription termination element in prokaryotic cells is a G-C rich fragment followed by a poly T sequence. While the element is easily cloned from a library or even purchased commercially as part of a vector, it can also be readily synthesized using methods for nucleic acid synthesis such as those described above.
- Expression vectors typically contain a gene coding for a selectable marker. This gene encodes a protein necessary for the survival and growth of a host cell grown in a selective culture medium. Typical selection marker genes encode proteins that (a) confer resistance to antibiotics or other toxins, e.g., ampicillin, tetracycline, chloramphenicol, or kanamycin for prokaryotic host cells, (b) complement auxotrophic deficiencies of the cell; or (c) supply critical nutrients not available from complex media.
- Preferred selectable markers are the kanamycin resistance gene, the ampicillin resistance gene, the chloramphenicol resistance gene, and the tetracycline resistance gene.
- the ribosome binding element commonly called the Shine-Dalgarno sequence in prokaryotes, is necessary for the initiation of translation of mRNA.
- the element is typically located 3′ to the promoter and 5′ to the coding sequence of the fusion protein DNA construct.
- the Shine-Dalgarno sequence is varied but is typically a polypurine (i.e., having a high A-G content). Many Shine-Dalgarno sequences have been identified, each of which can be readily synthesized using methods set forth above and used in a prokaryotic vector.
- Each element may be individually ligated into the vector by cutting the vector with the appropriate restriction endonuclease(s) such that the ends of the element to be ligated in and the ends of the vector are compatible for ligation. In some cases, it may be necessary to “blunt” the ends to be ligated together in order to obtain a satisfactory ligation. Blunting can be accomplished by first filling in “sticky ends” using an enzyme such as Klenow DNA polymerase or T4 DNA polymerase in the presence of all four nucleotides. This procedure is well known in the art and is described for example in Sambrook et al., supra.
- two or more of the elements to be inserted into the vector may first be ligated together (if they are to be positioned adjacent to each other) and then ligated into the vector.
- Another method for constructing the vector is to conduct all ligations of the various elements simultaneously in one reaction mixture.
- many nonsense or nonfunctional vectors may be generated due to improper ligation or insertion of the elements, however the functional vector may be identified by expression of the selectable marker.
- Proper sequence of the ligation product can be confirmed by digestion with restriction endonucleases or by DNA sequencing.
- the completed vector may be inserted into a suitable host cell for fusion protein expression.
- Host cells suitable for the present invention are bacterial cells.
- E. coli e.g., HB101, JM109, DH5 ⁇ , DH10, and MC1061
- the choice of bacterial strain is typically made so that the strain and the expression vector to be used are compatible.
- Various strains of B. subtilis, Pseudomonas spp., other Bacillus spp., Streptomyces spp., and the like may also be employed in practicing this invention in conjunction with appropriate expression vectors.
- Insertion (also referred to as “transformation” or “transfection”) of the vector into the selected host cell may be accomplished using such methods as calcium phosphate precipitation or electroporation.
- the method selected will in part be a function of the type of host cell to be used.
- the host cells containing the vector may be cultured using one or more standard media well known to the skilled artisan.
- the selected medium will typically contain all nutrients necessary for the growth and survival of the host cells.
- Suitable media for culturing E. coli cells are, for example, Luria broth (“LB”), YT broth, SOB, SOC, and/or Terrific Broth (“TB”).
- DNA construct encoding the fusion protein which comprises the TTR gene, the gene encoding the peptide or protein of interest, and, optionally, a DNA molecule encoding a linker peptide which is located between the two genes.
- the TTR gene and gene encoding the protein of interest can be ligated together in either orientation (e.g., TTR gene at the 5′ or 3′ end of the construct).
- a linker DNA molecule is to be included, it can first be ligated to one of the fusion partner genes, and that construct can then be ligated to the other fusion partner gene. Ligations are typically accomplished using DNA ligase enzyme in accordance with the manufacturer's instructions.
- a separate procedure provides for first ligating one fusion partner gene into the selected vector, after which the other fusion partner gene can be ligated into the vector in a position that is either 3′ or 5′ to the first fusion partner gene.
- the linker DNA molecule may be ligated to either fusion partner gene either before or after that gene has been ligated into the vector.
- the TTR-TMPs of the present invention can be used to treat conditions generally known as those that involve an existing megakaryocyte/platelet deficiency or an expected megakaryocyte/platelet deficiency (e.g., because of planned surgery or platelet donation). Such conditions will usually be the result of a deficiency (temporary or permanent) of active Mpl ligand in vivo.
- the generic term for platelet deficiency is thrombocytopenia, and hence the methods and compositions of the present invention are generally available for treating thrombocytopenia in patients in need thereof.
- Thrombocytopenia may be present for various reasons, including chemotherapy and other therapy with a variety of drugs, radiation therapy, surgery, accidental blood loss, and other specific disease conditions.
- Exemplary specific disease conditions that involve thrombocytopenia and may be treated in accordance with this invention are: aplastic anemia, idiopathic thrombocytopenia, metastatic tumors which result in thrombocytopenia, systemic lupus erythematosus, splenomegaly, Fanconi's syndrome, vitamin B12 deficiency, folic acid deficiency, May-Hegglin anomaly, Wiskott-Aldrich syndrome, and paroxysmal nocturnal hemoglobinuria.
- certain treatments for AIDS result in thrombocytopenia (e.g., AZT).
- Certain wound healing disorders might also benefit from an increase in platelet numbers.
- a compound of the present invention could be administered several days to several hours prior to the need for platelets.
- a compound of this invention could be administered along with blood or purified platelets.
- the TMP compounds of this invention may also be useful in stimulating certain cell types other than megakaryocytes if such cells are found to express Mpl receptor. Conditions associated with such cells that express the Mpl receptor, which are responsive to stimulation by the Mpl ligand, are also within the scope of this invention.
- the TMP compounds of this invention may be used in any situation in which production of platelets or platelet precursor cells is desired, or in which stimulation of the c-Mpl receptor is desired.
- the compounds of this invention may be used to treat any condition in a mammal wherein there is a need of platelets, megakaryocytes, and the like. Such conditions are described in detail in the following exemplary sources: WO95/26746; WO95/21919; WO95/18858; WO95/21920 and are incorporated herein.
- the TMP compounds of this invention may also be useful in maintaining the viability or storage life of platelets and/or megakaryocytes and related cells. Accordingly, it could be useful to include an effective amount of one or more such compounds in a composition containing such cells.
- compositions and compounds of the present invention may also be employed, alone or in combination with other cytokines, soluble Mpl receptor, hematopoietic factors, interleukins, growth factors or antibodies in the treatment of disease states characterized by other symptoms as well as platelet deficiencies. It is anticipated that the inventive compound will prove useful in treating some forms of thrombocytopenia in combination with general stimulators of hematopoiesis, such as IL-3 or GM-CSF.
- megakaryocytic stimulatory factors i.e., meg-CSF, stem cell factor (SCF), leukemia inhibitory factor (LIF), oncostatin M (OSM), or other molecules with megakaryocyte stimulating activity may also be employed with Mpl ligand.
- SCF stem cell factor
- LIF leukemia inhibitory factor
- OSM oncostatin M
- Additional exemplary cytokines or hematopoietic factors for such co-administration include IL-1 alpha, IL-1 beta, IL-2, IL-3, IL-4, IL-5, IL-6, IL-11, colony stimulating factor-1 (CSF-1), SCF, GM-CSF, granulocyte colony stimulating factor (G-CSF), EPO, interferon-alpha (IFN-alpha), consensus interferon, IFN-beta, or IFN-gamma. It may further be useful to administer, either simultaneously or sequentially, an effective amount of a soluble mammalian Mpl receptor, which appears to have an effect of causing megakaryocytes to fragment into platelets once the megakaryocytes have reached mature form.
- administering to enhance the number of mature megakaryocytes
- administration of the soluble Mpl receptor to inactivate the ligand and allow the mature megakaryocytes to produce platelets
- the dosage recited above would be adjusted to compensate for such additional components in the therapeutic composition. Progress of the treated patient can be monitored by conventional methods.
- the present invention also provides pharmaceutical compositions of the inventive compounds.
- Such pharmaceutical compositions may be for administration for injection, or for oral, nasal, transdermal or other forms of administration, including, e.g., by intravenous, intradermal, intramuscular, intramammary, intraperitoneal, intrathecal, intraocular, retrobulbar, intrapulmonary (e.g., aerosolized drugs) or subcutaneous injection (including depot administration for long term release); by sublingual, anal, vaginal, or by surgical implantation, e.g., embedded under the splenic capsule, brain, or in the cornea.
- the treatment may consist of a single dose or a plurality of doses over a period of time.
- compositions comprising effective amounts of a compound of the invention together with pharmaceutically acceptable diluents, preservatives, solubilizers, emulsifiers, adjuvants and/or carriers.
- Such compositions include diluents of various buffer content (e.g., Tris-HCl, acetate, phosphate), pH and ionic strength; additives such as detergents and solubilizing agents (e.g., Tween 80, Polysorbate 80), anti-oxidants (e.g., ascorbic acid, sodium metabisulfite), preservatives (e.g., Thimersol, benzyl alcohol) and bulking substances (e.g., lactose, mannitol); incorporation of the material into particulate preparations of polymeric compounds such as polylactic acid, polyglycolic acid, etc.
- buffer content e.g., Tris-HCl, acetate, phosphate
- additives such as detergents and solubilizing agents (
- compositions optionally may include still other pharmaceutically acceptable liquid, semisolid, or solid diluents that serve as pharmaceutical vehicles, excipients, or media, including but are not limited to, polyoxyethylene sorbitan monolaurate, magnesium stearate, methyl- and propylhydroxybenzoate, starches, sucrose, dextrose, gum acacia, calcium phosphate, mineral oil, cocoa butter, and oil of theobroma.
- Such compositions may influence the physical state, stability, rate of in vivo release, and rate of in vivo clearance of the present proteins and derivatives.
- compositions may be prepared in liquid form, or may be in dried powder, such as lyophilized form.
- Implantable sustained release formulations are also contemplated, as are transdermal formulations.
- Controlled release formulation may be desirable.
- the drug could be incorporated into an inert matrix which permits release by either diffusion or leaching mechanisms e.g., gums.
- Slowly degenerating matrices may also be incorporated into the formulation, e.g., alginates, polysaccharides.
- Another form of a controlled release of this therapeutic is by a method based on the Oros therapeutic system (Alza Corp.), i.e., the drug is enclosed in a semipermeable membrane which allows water to enter and push drug out through a single small opening due to osmotic effects. Some enteric coatings also have a delayed release effect.
- pulmonary delivery of the present protein is delivered to the lungs of a mammal while inhaling and traverses across the lung epithelial lining to the blood stream.
- Contemplated for use in the practice of this invention are a wide range of mechanical devices designed for pulmonary delivery of therapeutic products, including but not limited to nebulizers, metered dose inhalers, and powder inhalers, all of which are familiar to those skilled in the art.
- Some specific examples of commercially available devices suitable for the practice of this invention are the Ultravent nebulizer, manufactured by Mallinckrodt, Inc., St. Louis, Miss.; the Acorn II nebulizer, manufactured by Marquest Medical Products, Englewood, Colo.; the Ventolin metered dose inhaler, manufactured by Glaxo Inc., Research Triangle Park, N.C.; and the Spinhaler powder inhaler, manufactured by Fisons Corp., Bedford, Mass.
- each formulation is specific to the type of device employed and may involve the use of an appropriate propellant material, in addition to diluents, adjuvants and/or carriers useful in therapy.
- inventive compound should most advantageously be prepared in particulate form with an average particle size of less than 10 ⁇ m (or microns), most preferably 0.5 to 5 ⁇ m, for most effective delivery to the distal lung.
- Carriers include carbohydrates such as trehalose, mannitol, xylitol, sucrose, lactose, and sorbitol. Other ingredients for use in formulations may include DPPC, DOPE, DSPC and DOPC. Natural or synthetic surfactants may be used. Polyethylene glycol may be used (even apart from its use in derivatizing the protein or analog). Dextrans, such as cyclodextran, may be used. Bile salts and other related enhancers may be used. Cellulose and cellulose derivatives may be used. Amino acids may be used, such as use in a buffer formulation.
- the dosage regimen involved in a method for treating the above-described conditions will be determined by the attending physician, considering various factors which modify the action of drugs, e.g. the age, condition, body weight, sex and diet of the patient, the severity of any infection, time of administration and other clinical factors.
- the dose should be in the range of 0.1 ⁇ g to 100 mg of the inventive compound per kilogram of body weight per day, preferably 0.1 to 1000 ⁇ g/kg; and more preferably 0.1 to 150 ⁇ g/kg, given in daily doses or in equivalent doses at longer or shorter intervals, e.g., every other day, twice weekly, weekly, or twice or three times daily.
- inventive compounds may be administered by an initial bolus followed by a continuous infusion to maintain therapeutic circulating levels of drug product.
- the inventive compounds may be administered as a one-time dose.
- Those of ordinary skill in the art will readily optimize effective dosages and administration regimens as determined by good medical practice and the clinical condition of the individual patient. The frequency of dosing will depend on the pharmacokinetic parameters of the agents and the route of administration.
- the optimal pharmaceutical formulation will be determined by one skilled in the art depending upon the route of administration and desired dosage. See for example, Remington's Pharmaceutical Sciences, 18th Ed. (1990, Mack Publishing Co., Easton, Pa. 18042) pages 1435-1712, the disclosure of which is hereby incorporated by reference.
- a suitable dose may be calculated according to body weight, body surface area or organ size.
- Appropriate dosages may be ascertained through use of established assays for determining blood levels dosages in conjunction with appropriate dose-response data.
- the final dosage regimen will be determined by the attending physician, considering various factors which modify the action of drugs, e.g. the drug's specific activity, the severity of the damage and the responsiveness of the patient, the age, condition, body weight, sex and diet of the patient, the severity of any infection, time of administration and other clinical factors. As studies are conducted, further information will emerge regarding the appropriate dosage levels and duration of treatment for various diseases and conditions.
- TTR human transthyretin
- the expression plasmid pAMG21 is available from the ATCC under accession number 98113, which was deposited on Jul. 24, 1996 (see PCT WO 97/23614, published Jul. 3, 1997 for a description of pAMG21). DNA sequence coding for TTR, TTR variants or TTR-peptide fusions was placed under control of the LuxPR promoter in pAMG21.
- the Amgen host strain #2596 is an E. coli K-12 strain that has been modified to contain both the temperature sensitive lambda repressor cI857s7 in the early ebg region and the lacI Q repressor in the late ebg region (68 minutes).
- the presence of these two repressor genes allows the use of this host with a variety of expression systems, however both of these repressors are irrelevant to the expression from luxP R .
- the untransformed host has no antibiotic resistances.
- the ribosomal binding site of the cI857s7 gene has been modified to include an enhanced RBS.
- F'tet/GM101 was then modified by the delivery of a lacI Q construct into the ebg operon between nucleotide position 2493 and 2937 as numbered in the Genbank accession number M64441Gb_Ba with the deletion of the intervening ebg sequence.
- the construct was delivered to the chromosome using a recombinant phage called AGebg-LacIQ#5 into F'tet/GM101. After recombination and resolution only the chromosomal insert described above remains in the cell. It was renamed F'tet/GM221.
- the F'tet episome was cured from the strain using acridine orange at a concentration of 25 ⁇ g/ml in LB. The cured strain was identified as tetracyline sensitive and was stored as GM221.
- Oligonucleotides (1.0 nm each) were synthesized by phosphoramidite method. Nucleotides were, in some cases, altered for optimized expression in E. coli. These codon changes did not result in changes in the amino acid sequence. Each of the oligonucleotides utilized in this example are listed in Table 1.
- PCR was performed with the Expand Long Polymerase according to the manufacturer's protocol (Boehringer Mannheim). PCR products were verified by agarose gel electrophoresis, purified and digested with Nde1 and Xho1 (New England Biolabs). Expression vector pAMG21 was digested in the same manner and then treated with calf intestinal phosphatase (Boehringer Mannheim). The vector and insert were purified from an agarose gel, then mixed and ligated by T4 DNA ligase (New England Biolabs). Ligation was done at 4° C. for 2 hrs.
- Each ligation mixture was transformed by electroporation into the host strain GM221 described above with a Biorad GenePulser (Biorad Laboratories) using 2.5V, 25 uFD, and 200 ohms in a cuvette with a gap length of about 2 mm. After electroporation, the cells were allowed to recover in 1 ml of Luria broth (LB) for about one hour at 37° C. with gentle shaking. The entire transformation mix was plated on LB agar containing 50 ⁇ g/ml kanamycin. Colonies were screened for presence of the desired molecular weight by PCR using oligonucleotides directed against flanking vector sequence. The PCR products were evaluated by agarose gel electrophoresis. Positive clones were further screened for the ability to produce the recombinant protein product and finally verified by nucleotide sequencing.
- LB Luria broth
- TTR DNA and amino acid sequences of TTR are known (Mita, S et al., Biochem. Biophys. Res. Commun. 124 (2), 558-564 [1984]). These sequences have been deposited in Genbank as accession number K02091. The cDNA of native TTR excluding the signal peptide was cloned from a cDNA library derived from human liver (Clontech).
- an oligonucleotide encoding eight codons of the TTR 5′ (Oligo 2693-79) end and an oligonucleotide encoding seven codons of TTR 3′ end including a terminating codon (Oligo 2693-80) were synthesized and used to amplify the full-length mature TTR with Expand Long polymerase using human liver cDNA library as template.
- the resulting PCR fragment was digested with NdeI and XhoI, gel purified and ligated with NdeI/XhoI restricted expression vector pAMG21. After 2 hours at 4° C., the ligation mixture was electroporated into GM221 cells.
- Mutant TTR(C10A) was made by using oligonucleotide 2693-80 above and oligonucleotide 2820-88 (encompasses the first 11 codons of native TTR in which the codon Cys at the tenth position was changed to Ala).
- the PCR procedure and the process for selecting the expression strain were similar to that described above.
- the resulting strain (strain #5619) had the DNA sequence identified in SEQ ID NO:3.
- Plasmid 5619 was further modified by replacing the amino acids at the following positions: A37, D38, A81 and G83, with the amino acid Cysteine.
- each pair of the complementary oligonucleotides harboring the desired mutations was used in conjunction with TTR 5′ and 3′ primers described above in a standard two-step PCR procedure designed for site-specific mutagenesis.
- Each of the forward primers were used with a TTR 3′ primer and each of the reverse primers were used with a TTR 5′ primer in a 20-cycle PCR in which plasmid derived from strain 5619 was used as the template.
- TTR(A37C) forward (Oligo 2823-91); TTR(A37C) reverse (Oligo 2823-92); TTR(D38C) forward (Oligo 2823-93); TTR(D38C) reverse (Oligo 2823-94); TTR(A81C) forward (Oligo 2823-95); TTR(A81C) reverse (Oligo 2823-96); TTR(G83C) forward (Oligo 2823-97); TTR(G83C) reverse (Oligo 2823-98).
- TTR(C10A/A37C)(strain 5641) had the DNA sequence identified in SEQ ID NO:4.
- TTR(C10A/D38C)(strain 5642) had the DNA sequence identified in SEQ ID NO:5.
- TTR(C10A/A81C)(strain 5643) had the DNA sequence identified in SEQ ID NO:6.
- TTR(C10A/G83C)(strain 5651) had the DNA sequence identified in SEQ ID NO:7.
- the Lys in the 15th position in strain 5651 was further mutagenized to Ala using oligonucleotides 2953-67 and 2953-68 by a procedure similar to that described for strains 5641, 5642, 5643 and 5651.
- the resulting strain, TTR(C10A/K15A/G83C)(strain 5895) had the DNA sequence identified in SEQ ID NO:8.
- This example describes the preparation of various TMP-TTR fusions. Several fusion proteins containing TTR and a TMP were prepared. Each of the oligonucleotides utilized in this example are listed in Table 2.
- a fragment containing the TMP was first amplified from a strain harboring a plasmid encoding a full-length TMP-FC fusion (see PCT Publication No. 00/24770) using oligonucleotides 2743-96 which encodes the first 7 codons of the TMP plus a 12 nucleotide 5′ extension including a Nde1 site and 2743-97 which encodes the first 7 codons of native TTR and the last 7 codons of the TMP of interest.
- TMP-TTR (strain 5513) had the DNA sequence identified in SEQ ID NO:9.
- TMP was then introduced to the N-terminus of strains 5641, 5642, 5643 and 5651, respectively.
- Plasmid 5513 was digested with Xba1, the resulting Xba1/Xba1 insert containing the TMP and the first 18 codons of TTR(C10A) was gel purified and ligated with Xba1 restricted, phosphatase treated and gel purified vector derived from 5641, 5642, 5643 and 5651.
- DNA sequencing was performed to select the correct orientation for each fusion.
- the resulting E. coli strains containing the plasmids are described as follows: TMP-TTR(C10A/A37C)(strain 5704) had the DNA sequence identified in SEQ ID NO:10.
- TMP-TTR(C10A/D38C) (strain 5705) had the DNA sequence identified in SEQ ID NO:11.
- TMP-TTR(C10A/A81C) (strain 5706) had the DNA sequence identified in SEQ ID NO:12.
- TMP-TTR(C10A/G83C) (strain 5707) had the DNA sequence identified in SEQ ID NO:13.
- TABLE 2 SEQ ID Oligo Sequence Number 2743-96 GAGGAATAACATATGATCGAAGGTCCGACTCTGCGT 31 2743-97 TTCACCGGTACCAGTTGGACCTGCGCGTGCTGCAAG 32 CCATT
- oligonucleotide 2694-01 which encodes the first 7 codons of human PTH
- oligonucleotide 2694-03 which encodes the first 7 codons of TTR and amino acids 28-34 of PTH
- Oligonucleotides 2694-01 and 2694-03 were used in a 20-cycle PCR procedure as described above to amplify PTH (1-34) with the TTR linker.
- the template for this reaction was a strain which harbors a plasmid encoding a PTH1-34-Fc fusion (see PCT Publication No. 01/81415).
- This example describes the preparation of an IL-1ra-TTR(C10A) fusion and a TTR(C10A)-GSGS-IL-1ra fusion.
- TTR(C10A)-GSGS-IL-1ra fusion Each of the oligonucleotides utilized in this example are listed in Table 4.
- oligonucleotide 2823-13 which encodes the first 7 codons of the human protein IL-1ra
- oligonucleotide 2823-14 which encodes the last 7 amino acids of IL-1ra and the first 7 amino acids of TTR
- the resulting PCR product was mixed with plasmid purified from strain 5619 and used as a template to amplify full-length IL-1-ra-TTR(C10A) using oligonucleotide primers 2823-13 and 2693-80.
- the PCR product was cloned, sequenced and expressed as described above.
- the resultant strain containing the new plasmid was designated IL-1ra -TTR(C10A) (strain 5644) and had the DNA sequence identified in SEQ ID NO:15.
- oligonucleotide 2787-32 which encodes the last 7 amino acids of TTR
- oligonucleotide 2787-33 which encodes the last 7 codons of IL-1-ra
- Plasmid purified from strain 5651 was used for PCR with oligonucleotide primer 2693-79 and oligonucleotide primer 2943-47, which is a TTR 3′ primer containing a PstI restriction site.
- This PCR product was gel purified and restriction digested with NdeI and PstI.
- the resulting DNA fragment was used in a ligation mixture containing AMG21, digested with NdeI and XhoI, and the annealed oligonucleotide linkers 2943-48, which encodes the GSGSG linker, and oligonucleotide 2943-49, which encodes the Bradykinin antagonist peptide KRPPGFSPL with PstI 5′ and XhoI 3′ overlapping ends.
- GM121 was transformed with this ligation product and DNA was purified from the kanamycin resistant colonies. The DNA sequence was then confirmed in the resistant colonies. The confirmed strain was grown at 30° C. and induced for expression in a 10-liter fermentation described below.
- the new strain was designated TTR(C10A/G83C)-Bradykinin (strain 5914) and had the DNA sequence identified in SEQ ID NO:17.
- TABLE 5 SEQ ID Num- Oligo Sequence ber 2693-79 GAGGAATAACATATGGGTCCAACTGGTACCGGTGAA 39 2943-47 AATATACTGCAGTGGTGGAATAGGAG 40 2943-48 GTCGTCACCAATCCCAAGGAAGGATCAGGATCCGGA 41 AAACGTCCGCCGGGTTTCTCCCCGCTGTAATC 2943-49 TCGAGATTACAGCGGGGAGAAACCCGGCGGACGTTTT 42 CCGGATCCTGATCCTTCCTTGGGATTGGTGACGACTG CA
- This example describes the recombinant expression of TTR and the TTR fusion constructs in E. coli.
- Each of the newly constructed TTR or TTR fusions were first examined for soluble expression at temperatures ranging from 16° C. to 37° C.
- cultures (25 ml) of GM221 expressing each of the TTR or TTR fusions were grown in LB medium supplemented with 50 ⁇ g/ml kanamycin at 37° C. until the optical density (OD) at 600 nm reached 0.5 to 1.0.
- the cultures were then placed in shakers with temperature settings at 16° C., 20° C., 25° C., 30° C., 34° C. and 37° C., respectively.
- the induction of gene product expression from the luxPR promoter was achieved following the addition of the synthetic autoinducer N-(3-oxohexanoyl)-DL-homoserine lactone to the culture media to a final concentration of 20 ng/ml. After 6 hours, the bacterial cultures were examined by microscopy for the presence of inclusion bodies. Often soluble or partial soluble expression could be achieved by growing the cultures at temperatures lower than 30° C. for TTR and its fusions, and this temperature was used for large-scale expression. In cases where soluble expression could not be achieved, temperatures at which the level of expression was at the highest were used for large-scale shakers or fermentors.
- the fermentation stage begins with the inoculation from a seed culture of strains produced in a shake flask containing 500 mL of sterilized Luria broth.
- this culture obtained the appropriate cell density (0.8-2 at 600 nm)
- the contents were used to inoculate a 20 liter fermentor containing 10 liter of complex based growth medium.
- the fermentor is maintained at 30° C. and pH 7 with dissolved oxygen levels kept at 30% saturation.
- the cell density reached an optical density of 10-12 OD units at 600 nm, at which point the culture was induced by the addition of N-(3-oxo-hexanoyl) homoserine lactone.
- the cells were harvested from the fermentor by centrifugation.
- This example describes the purification of TTR(C10A/G83C)-Bradykinin.
- 50 tablets of Sigma protease inhibitor cocktail 1-873-580 (Saint Louis, Mo.) was dissolved in the cell suspension and the suspension was passed through a model 110-Y microfluidizer (Microfluidics, Newton, Mass.) twice at 12,000 PSI.
- the lysate (FIG. 1, Lane 2) was centrifuged at 11,325 ⁇ g for 50 min 4° C.
- the supernatant was removed as the soluble fraction.
- the soluble fraction was heated in a 65° C. water bath for 30 minutes in polypropylene bottles, at which time the temperature of the contents was 63° C.
- the soluble fraction was centrifuged at 11,325 ⁇ g for 50 minutes 4° C.
- the supernatant was removed as Heat Soluble (FIG. 1, Lane 3).
- the heat soluble fraction was filtered through a 0.45 ⁇ m cellulose acetate filter with two prefilters and then loaded on to a 240 ml Q-sepharose fast flow (5 cm ID) column (Amersham Pharmacia Biotech, Piscataway, N.J.) at 20 ml/min equilibrated in Q-Buffer A (20 mM tris HCl, 2.5 mM EDTA, pH 8.0) at room temperature (about 23° C.). Column was washed with about 2300 ml Q-Buffer A at 20 ml/min.
- Q-column was eluted with a 15 column volume linear gradient to 60% Q-Buffer B (20 mM tris HCl, 1 M NaCl, 2.5 mM EDTA, pH 8.0) followed by a 2 column volume step to 100% Q-Buffer B. Fractions containing the TTR fusion as determined by SDS-PAGE were pooled into a single Q-pool (1150 ml) (FIG. 1, Lane 4) and 1.77 g of DTT was added. The Q-pool was gently stirred for 30 min at room temperature (about 23° C.).
- P-pool was loaded on to a 105 ml (2.6 cm) type 1 ceramic hydroxyapatite column (Bio-Rad Inc., Hercules, Calif.) at 10 ml/min in HA-Buffer A. Column was washed with approximately 210 ml HA-Buffer A at 10 ml/min followed by 4 steps of 12.5%, 25%, 50%, and 100% HA-Buffer B (400 mM NaH 2 PO 4 , pH 7.0). The flowthrough was pooled as HA-pool (340 ml) (FIG. 1, Lane 6) and 524 mg of DTT was added followed by incubation at room temperature (about 23° C.) for 1 hour.
- HA-pool 340 ml
- Lane 6 524 mg of DTT was added followed by incubation at room temperature (about 23° C.) for 1 hour.
- HA-pool About one-half of the HA-pool was loaded on to a 47 ml source 15Q (2.6 cm ID) column (Amersham Pharmacia Biotech) at 10 ml/min followed by a wash with about 250 ml Q-Buffer A. Column was eluted with a 20 column volume linear gradient from 10% to 50% Q-Buffer B followed a step of 2 column volumes of 100% Q-Buffer B. The remaining half of the HA-Pool was then processed using the same protocol as the first half. Fractions containing the TTR fusion as determined by SDS-PAGE were pooled into a single Q2-pool (260 ml) and concentrated to about 75 ml using a stirred cell with a 10 kDa membrane. Q2-pool (FIG.
- TTR(C10A/G83C) fusing a peptide to either the C-terminus or N-terminus of TTR(C10A/G83C) does not have a significant impact on its oligomeric structure.
- TTR(C10A/G83C) eluted at approximately 8.8 min corresponding to a molecular size of 49 kDa, which is comparable to the calculated molecular weight of the tetramer at 55 kDa.
- PTH-TTR(C10A/K15A/G83C) eluted at about 8.6 min corresponding to a molecular size of 67 kDa, which is close to the calculated 71 kDa for the tetramer.
- TTR(C10A/G83C)-Bradykinin eluted at about 8.7 min corresponding to a molecular size of 57 kDa, which is also close to the calculated 60 kDa for the tetramer.
- TTR(C10A) IL-1-ra-TTR(C10A)
- TTR(C10A)-IL-1-ra was injected on to a Biosep-Sec-S 3000 column (7.8 mm ID ⁇ 300 mm) (Phenomenex) in SEC-Buffer at 1 ml/min.
- Bio-Rad molecular weight standards (151-1901) were used to calibrate the column and calculate the approximate molecular weight of the injected samples.
- TTR(C10A) elutes at approximately 8.8 min, which corresponds to a molecular size of 49 kDa which is comparable to the calculated molecular weight of the tetramer at 55 kDa.
- the IL-1-ra-TTR(C10A) fusion eluted at about 7.9 min corresponding to a molecular size of 188 kDa, which is noticeably larger than that expected for the tetramer at 124 kDa.
- TTR(C10A)-IL-1-ra eluted at about 7.9 min, again corresponding to a molecular size of 188 kDa compared to the 124 kDa expected for the tetramer.
- This example compares the binding of a TMP sequence fused to the carboxy-terminus of human immunoglobulin Fc (Fc-TMP) and TMP(m)-TTR to soluble human myeloproliferative leukemia (MPL) receptor.
- Fc-TMP human immunoglobulin Fc
- MPL myeloproliferative leukemia
- this figure demonstrates that pegylation of the native TTR cysteine (Cys 10) interferes with the binding of TMP to the MPL receptor.
- the binding of TMP(m)-TTR-PEG5K showed a significantly repressed binding response compared to its non-pegylated counterpart, and TMP(m)-TTR-PEG20K showed an even more severe inhibition.
- This example shows the effect of injecting TMP(m)-TTR into mice on blood platelet count.
- 50 BDF1 mice (Charles River Laboratories, Wilmington, Mass.) were split into 5 groups and injected (day 0) subcutaneously with either diluting agent (Dulbecco's PBS with 0.1% bovine serum albumin) or diluting agent with 50 ⁇ g test protein per kg animal.
- diluting agent Dulbecco's PBS with 0.1% bovine serum albumin
- diluting agent 50 ⁇ g test protein per kg animal.
- Each group was divided in half and bled (140 ⁇ l) from the retro-orbital sinus on alternate time points (day 0, 3, 5, 7, 11, 12, 14, and 17). Mice were anesthetized with isoflurane prior to bleeding.
- TMP(m)-TTR-PEG 5K was a moderate responder peaking at 2.3 ⁇ 10 12 platelets L ⁇ 1 which is just under twice the baseline level.
- the non-pegylated form of TMP(m)-TTR shows very little response at 1.5 ⁇ 10 12 platelets L ⁇ 1 which is only 20% over the baseline level.
- TMP(m)-TTR shows better binding in vitro than its pegylated counterparts (FIG. 4), but it has poor performance in vivo compared to TMP(m)-TTR-PEG 5K. This indicates that PEG is required to improve the biological half-life of the TTR construct, and this more than compensates for the reduced affinity for the receptor.
- TTR(C10A) elutes at approximately 8.8 min, which corresponds to a molecular size of 57 kDa which is similar to the calculated molecular weight of the tetramer at 55 kDa.
- This data combined with the observation that both forms of TTR are resistant to precipitation at 65° C. (data not shown) indicates that mutation of cysteine 10 to alanine does not have a significant impact on the structure or stability of TTR.
- This example demonstrates that mutation of alanine 37 to cysteine TMP-TTR(C10A/A37C), aspartate 38 to cysteine TMP-TTR(C10A/D38C), alanine 81 to cysteine TMP-TTR(C10A/A81C), or glycine 83 to cysteine TMP-TTR(C10A/G83C) in a cysteine 10 to alanine background does not have a significant impact on the oligomeric structure of TTR.
- this example demonstrates that pegylation of these mutant forms of TTR with a 5K or 20K PEG produces two distinct species of TTR with significantly greater molecular size than the unpegylated form.
- the pegylation of TTR was carried out by first reducing about 8 ml of the TTR (7.28 mg/ml) with 10 mM DTT for 30 minutes at 30° C. in the presence of 50 mM tris HCl, pH 8.5.
- the reduced TTR was then desalted using a 26 ml sephadex G25 medium column (2.6 cm ID) (Amersham Pharmacia Biotech) at 2.5 ml/min in 20 mM tris HCl, pH 8.5.
- the concentration was then determined by measuring the absorbance of the reduced TTR at 280 nm and using the calculated extinction coefficient (29,450 M ⁇ 1 for TMP-TTR(C10A/A37C) (5.14 mg/ml).
- One-half (4.6 ml) of the reduced sample was then immediately mixed with 810 ⁇ l of 5 mM methoxy-PEG-maleimide 5K (Shearwater Corporation, Huntsville, Ala.) and the remaining half was mixed with 1620 ⁇ l 2.5 mM methoxy-PEG-maleimide 20K (Shearwater Corporation).
- the reaction was allowed to proceed at 30° C. for 30 min and was quenched by the addition of 46 ⁇ l 1 M DTT.
- Each pegylated sample was then loaded on to a 5 ml HiTrap Q-sepharose column at 2.5 ml/min and washed with several column volumes of Q-Buffer A (20 mM tris HCl, pH 8.0) at 5 ml/min.
- the columns were eluted with a linear gradient to 40% Q-Buffer B (20 mM tris HCl, 1 M NaCl, pH 8.0) followed by a 2 column volume step to 100% Q-Buffer B. Peak fractions were pooled and the concentration determined by measuring the absorbance of the pool at 280 nm. About 50 ⁇ g of each sample was injected on to a Biosep-Sec-S 3000 column (7.8 mm ID ⁇ 300 mm) (Phenomenex) in SEC-Buffer at 1 ml/min. Bio-Rad molecular weight standards (151-1901) were used to calibrate the column and calculate the approximate molecular size of the injected samples. As can be seen in FIG.
- the apparent molecular size of the 4 non-pegylated TMP-TTR constructs is between 40 and 45 kDa which is noticeably lower than the expected 70 kDa tetramer. This retarded elution time is likely due to a slight interaction of the TMP-TTR construct with the size exclusion resin, which has been observed with several other TMP constructs (data not shown). After conjugation with the 5K PEG, the apparent molecular size increases to between 421 and 428 kDa (1.53-1.64 minutes more advanced elution than the unpegylated counterparts), which is much greater than the expected 90 kDa.
- FC-TMP was bound to a BIAcore protein G chip at high density as per the manufacturer's instructions (BIAcore, Uppsula, Sweden).
- Test proteins were preincubated with 5 nM MPL receptor in Binding Buffer (Dulbecco's PBS (Gibco BRL, Gaithersburg, Md.) with 0.1 mg/ml bovine serum albumin and 0.005% P20 (polyoxyethylenesorbitan) for >2 hours at room temperature (about 23° C.). For non-pegylated proteins, 0.1 mg/ml heparin was added to prevent non-specific binding. All samples were then passed over the chip at 50 ⁇ l/min in Binding Buffer. The equilibrium endpoint was taken 3 min post injection. As can be seen in FIG. 9, all TTR constructs showed similar affinity for the MPL receptor with affinities ranging from 0.881 to 2.333 nm, while the Fc-TMP construct had affinities ranging from 3.276 to 5.369 nm.
- Binding Buffer Dulbecco's PBS (Gibco BRL, Gaithersburg, Md.) with 0.1 mg/ml bo
- This example shows the effect of injecting pegylated TMP-TTR constructs into mice on blood platelet count.
- 170 BDF1 mice were split into 17 groups and injected (day 0) subcutaneously with 50 ⁇ g test protein per kg animal (TMP fusion construct, Fc-TMP, or a TTR(C10A) control). Each group was divided in half and bled (140 ⁇ l) from the retro-orbital sinus on alternate time points (day 0, 3, 5, 7, 10, 12, and 14). Mice were anesthetized with isoflurane prior to bleeding. The collected blood was analyzed for a complete and differential count using an ADVIA 120 automated blood analyzer with murine software (Bayer Diagnostics, New York, N.Y.).
- Fc-TMP showed the greatest response with platelet count rising to over 4.2 ⁇ 10 12 platelets L ⁇ 1 on day 5 which is 3 times baseline at 1.4 ⁇ 10 12 platelets L ⁇ 1 .
- All 4 of the non-pegylated TMP-TTR constructs preformed better than the control, but not as well as Fc-TMP with platelet counts between 1.8 and 2.9 ⁇ 10 12 platelets L ⁇ 1 on day 5, which is between a 29% and 107% improvement over baseline.
- FIG. 10A Fc-TMP showed the greatest response with platelet count rising to over 4.2 ⁇ 10 12 platelets L ⁇ 1 on day 5 which is 3 times baseline at 1.4 ⁇ 10 12 platelets L ⁇ 1 .
- All 4 of the non-pegylated TMP-TTR constructs preformed better than the control, but not as well as Fc-TMP with platelet counts between 1.8 and 2.9 ⁇ 10 12 platelets L ⁇ 1 on day 5, which is between a 29% and 107% improvement over baseline.
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US10/407,078 US20030195154A1 (en) | 2002-04-04 | 2003-04-03 | Use of transthyretin peptide/protein fusions to increase the serum half-life of pharmacologically active peptides/proteins |
JP2003583462A JP4738743B2 (ja) | 2002-04-04 | 2003-04-03 | 薬理学的活性ペプチド/タンパク質の血清中半減期を上昇させるためのトランスサイレチンペプチド/タンパク質融合物の使用 |
AU2003224844A AU2003224844B2 (en) | 2002-04-04 | 2003-04-03 | Use of transthyretin peptide/protein fusions to increase the serum half-life of pharmacologically active peptides/proteins |
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EP10178081A EP2298331A3 (en) | 2002-04-04 | 2003-04-03 | Use of transthyretin peptide/protein fusions to increase the serum half-life of pharmacologically active peptides/proteins |
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ES03721538T ES2400341T3 (es) | 2002-04-04 | 2003-04-03 | Uso de fusiones de proteína/péptido de transtiretina para aumentar la semivida sérica de péptidos/proteínas farmacológicamente activos |
MXPA04009680A MXPA04009680A (es) | 2002-04-04 | 2003-04-03 | Uso de fusiones de peptido/proteina con transtiretina para incrementar la vida media en suero de peptidos/proteinas farmacologicamente activos. |
US12/380,451 US8633153B2 (en) | 2002-04-04 | 2009-02-26 | Transthyretin variants |
JP2010264759A JP2011136981A (ja) | 2002-04-04 | 2010-11-29 | 薬理学的活性ペプチド/タンパク質の血清中半減期を上昇させるためのトランスサイレチンペプチド/タンパク質融合物の使用 |
US14/157,325 US20140234945A1 (en) | 2002-04-04 | 2014-01-16 | Transthyretin variants |
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US10/407,078 Abandoned US20030195154A1 (en) | 2002-04-04 | 2003-04-03 | Use of transthyretin peptide/protein fusions to increase the serum half-life of pharmacologically active peptides/proteins |
US12/380,451 Expired - Fee Related US8633153B2 (en) | 2002-04-04 | 2009-02-26 | Transthyretin variants |
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US12/380,451 Expired - Fee Related US8633153B2 (en) | 2002-04-04 | 2009-02-26 | Transthyretin variants |
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Also Published As
Publication number | Publication date |
---|---|
JP2005529108A (ja) | 2005-09-29 |
WO2003086444A1 (en) | 2003-10-23 |
EP1496926A4 (en) | 2006-10-18 |
ES2400341T3 (es) | 2013-04-09 |
JP2011136981A (ja) | 2011-07-14 |
EP1496926A1 (en) | 2005-01-19 |
US20090191624A1 (en) | 2009-07-30 |
EP2298331A2 (en) | 2011-03-23 |
CA2480883A1 (en) | 2003-10-23 |
EP1496926B1 (en) | 2012-12-19 |
US20140234945A1 (en) | 2014-08-21 |
AU2003224844A1 (en) | 2003-10-27 |
AU2003224844B2 (en) | 2009-05-21 |
US8633153B2 (en) | 2014-01-21 |
EP2298331A3 (en) | 2011-04-13 |
PL372849A1 (en) | 2005-08-08 |
JP4738743B2 (ja) | 2011-08-03 |
US20030195154A1 (en) | 2003-10-16 |
MXPA04009680A (es) | 2005-01-11 |
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