WO2003106501A1 - Fusion protein comprising angiopoietin receptor-binding and a multimerization domain - Google Patents
Fusion protein comprising angiopoietin receptor-binding and a multimerization domain Download PDFInfo
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- WO2003106501A1 WO2003106501A1 PCT/IB2003/003814 IB0303814W WO03106501A1 WO 2003106501 A1 WO2003106501 A1 WO 2003106501A1 IB 0303814 W IB0303814 W IB 0303814W WO 03106501 A1 WO03106501 A1 WO 03106501A1
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- Prior art keywords
- angl
- ligand
- chimeric molecule
- coiled coil
- receptor
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K19/00—Hybrid peptides, i.e. peptides covalently bound to nucleic acids, or non-covalently bound protein-protein complexes
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/475—Growth factors; Growth regulators
- C07K14/515—Angiogenesic factors; Angiogenin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
- A61K38/16—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- A61K38/17—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P39/00—General protective or antinoxious agents
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
Definitions
- the present invention provides for a novel method of producing novel chimeric molecules that have enhanced biological activity, and easier production and purification processes as compared with molecules in their native form.
- the invention also provides for nucleic acids useful for producing biologically active chimeric polypeptides, and the fusion polypeptides themselves.
- Transmembrane protein kinases serve as signaling receptors for a variety of polypeptide ligands, eliciting such diverse responses as cell survival, proliferation and differentiation from many cell types and tissues (van der Geer et al, 199 '4, Annu Rev Cell Biol. 10:251-337).
- RTKs Receptor tyrosine kinases
- Tie2 tyrosine kinase with immunoglobulin and epidermal growth factor receptor homology domains (Tie), Tie2 (Dumont et al., 1993, Oncogene 8:1293-1301; Mustonen and Alitelo, 1995, J Cell Biol. 129:895-898). Tie2 is expressed predominantly on endothelial cells, hematopoietic cells, or their embryonic precursors, and it is required for normal vascular development (Sato et al, 1995, Nature 376:70-74).
- Tie2 Functional disruption of Tie2 in transgenic mice results in embryonic lethality by day E9.5 to 10.5, with effects on the microvasculature resulting in reduced numbers of endothelial cells, and abnormalities of vascular morphogenesis and hematopoiesis (Sato et al, 1995, Nature 376:70-74). Thus, Tie2 is critical for angiogenesis and hematopoiesis during development. [0006] Davis et al. discovered that Angl is the ligand for Tie2 (Davis et al, 1996, Cell 87:1161-1169; WO9611269) ( Figure 1). Angl contains 498 amino acids, including an amino-terminal secretory signal sequence ( Figure 1).
- Angl Human and mouse Angl are 97.6% identical.
- the amino-terminal region consisting of residues 100-280, is weakly related to myosin and its relatives, in the regions of these proteins where they are known to possess coiled-coil quaternary structure ( Figure 1).
- the second region consisting of residues 280- 498, has strong similarity to the carboxy-terminal domain of fibrinogen ( Figure 1).
- Angl is a multimer, held together by coiled-coil structures and disulfide crosslinks.
- Recombinant Angl is a 70-kDa (reduced condition) secreted glycoprotein that binds to the Tie2 receptor with a Kd of approximately 3.7 nM, and induces tyrosine phosphorylation of Tie2 in endothelial cells (Davis et al, 1996, Cell 87: 1161-1169).
- Angl protein consists of an amino-terminal secretory signal sequence (residues 1-19), a unique domain (residues 20-158), a coiled- coil oligomerization domain (residues 159-254), a short linker region (residues 255-283), and a carboxy-terminal fibrinogen-like domain (residues 284-498).
- Angiopoietin-1 is a specific and critical growth factor for blood vessel formation (Davis et al, 1996, Cell 87:1161-1169; Yancopoulos et al, 2000, Nature 407:242-248).
- Angl could be used for preventing vascular leakages, therapeutic vasculogenesis, and therapeutic endothelial cell survival (Thurston et al., 2000, Nat. Med. 6:460-463; Chae et al., 2000, Arterioscler. Thromb. Vase. Biol. 20:2573-2578; Kwak et al, 2000, Circulation 101:2317-2324).
- Angl protein is not easily available, and generation of recombinant Angl is extremely difficult with current techniques. Multimerization of the coiled coil domains during production of the ligand hampered purification.
- Ang2 angiopoietin-2
- Ang2 contains 496 ammo acids and has a secretory signal sequence.
- Human and mouse Ang2 are 85% identical and approximately 60% identical to Angl .
- Ang2 has an amino-terminal coiled-coil domain and a carboxy-terminal fibrinogen-like domain.
- Angl and Ang2 have similar binding affinities for Tie2.
- Ang2 acts as an antagonist of Tie2 through inhibition of Angl -induced phosphorylation of Tie2 (Maisonpierre et al, 1997, Science 277:55-60).
- Mouse angiopoietin-3 (Ang3) and human angiopoietin-4 (Ang4) were identified through low stringency hybridization screening with Angl and Ang2 cDNAs (Valenzuela et al, 1999, Proc Natl Acad Sci. 96:1904-1909).
- Ang3 and Ang4 are probably interspecies orthologs.
- Ang4 phosphorylates Tie2, while Ang3 inhibits Angl-induced phosphorylation of Tie2 (Valenzuela et al, 1999, Proc Natl Acad Sci.
- Multimeric form of Angl phosphorylates Tie2.
- phosphorylated Tie2 interacts cytoplasmically with Grb2, Grb7, Grbl4, the protein tyrosine phosphatase Shp2, and the p85 subunit of phosphatidylinositol 3'-kinase (PI 3'-kinase) via their SH2 domains (Jones et al, 1999, J Biol Chem. 274:30896-30905).
- Association between p85 and Tie2 results in PI 3 '-kinase activation and subsequent induction of the serine-threonine kinase Akt.
- Angl induces endothelial cell survival through this PI 3'-kinase/Akt signaling pathway (Kim et al, 2000, Circ Res. 86:24-29). In addition, Angl induces endothelial cell sprouting through the activation of PI 3'-kinase and focal adhesion kinase (Kim et al, 2000, Circ Res. 86:952-959).
- Tie2 PI 3'-kinase, Akt, and focal adhesion kinase are crucial elements in the signal transduction pathway leading to survival and migration in endothelial cells.
- Phosphorylated Tie2 also interacts with Dok-R/Dok-2, leading to activation of Dok- R/Dok-2 (Jones and Dumont, 1998, 17:1097-1108).
- Phosphorylated Dok-R interacts with rasGAP, Nek, and Crk (Jones and Dumont, 1998, 17:1097-1108). These signaling molecules may be involved in cell migration and proliferation, organization of the cytoskeleton, and regulation of Ras signaling. Recently, it was shown that Dok-R/Dok-2 is responsible for recruiting Nek and p21 -activating kinase (Pak/Pakl) to the activated receptor (Master et al, 2001, EMBO J. 20:5919-5928).
- Angl* made by Regeneron Pharmaceuticals, Inc., is a recombinant version of
- Angl that is easier to produce and purify (Maisonpierre et al, 1997, Science 277:55-60; (PCT WO 98/05779)).
- Angl* contains a modified amino-terminus and mutated Cys 265 .
- U. S. Patent No. 6,455,035 discloses a method of decreasing or inhibiting vascular permeability in a mammal by administering to the mammal a Tie-2 receptor activator. Moreover, USP '035 also discloses that the coiled coil domain of Angl was deleted so that the multimerization of the coiled coil domains would not hamper ligand purification.
- WO 00/37462 discloses a method of enhancing the biological activity of Angl through deletion of coiled-coil domain and insertion with Fc-portion of immunoglobulin for making a tetramer form of chimeric fusion Angl (Angl-IFD-Fc-FD).
- Angl-IFD-Fc-FD chimeric fusion Angl
- Angl-IFD-Fc-FD is equivalent to Angl* in its ability to stimulate phosphorylation ofthe Tie2 receptor.
- the claimed invention overcomes the above-mentioned problems, and provides for novel, biologically active, soluble forms of chimeric polypeptide ligands that bind to specific receptors on cells, including growth factors belonging to angiopoietin family.
- polypeptide ligands are useful in promoting or inliibiting a differential function and/or influencing the phenotype, such as growth, survival, contractility, migration, and/or proliferation, of receptor-bearing cells such as endothelial cells, hematopoietic stem cells, and endothelial precursor cells.
- the invention also provides for nucleic acids encoding such polypeptide ligands, and both prokaryotic and eukaryotic expression systems for producing such polypeptide ligands.
- nucleic acids encoding such polypeptide ligands
- prokaryotic and eukaryotic expression systems for producing such polypeptide ligands.
- soluble forms of the polypeptide ligands described herein may be used to promote or inhibit biological responses in receptor-expressing cells.
- the present invention is directed to a coiled coil chimeric molecule comprising a coiled-coil domain linked to either a receptor binding domain of a ligand or a ligand binding domain of a receptor, which forms a biologically active multimer, and wherein the chimeric molecule in its non-multimeric form is not biologically active.
- the coiled coil domain includes those belonging to a protein belonging to matrix protein family, transcription factor family, growth factor family or secretory protein family.
- the coiled coil domain may be of a matrix protein, in particular, cartilage matrix protein or cartilage oligomeric matrix protein.
- the receptor binding domain may bind to a variety of receptors, and in particular, Tie2 or Tiel receptor.
- the receptor binding domain may be a fibrinogen-like domain of angiopoietin- 1, angiopoietin-2, angiopoietin-3 or angiopoietin-4.
- the coiled coil chimeric molecule may be linked directly or indirectly to an extracellular domain ofthe receptor.
- the ligand binding domain may bind to angiopoietin- 1, angiopoietin-2, angiopoietin-3 or angiopoietin-4.
- the ligand binding domain may comprise extracellular domain of Tie2 receptor or Tiel receptor.
- the ligand may be an agonist or antagonist.
- the ligand may be a cytokine, hormone or growth factor.
- the ligand may be also an angiopoietin-related protein.
- the ligand may be angiopoietin-related protein- 1 (ARP1), angiopoietin-related protein-2 (ARP2), hepatic fibrinogen/angiopoietin-related protein (HFARP).
- the ligand may be ephrin.
- the ligand may be EphrinAl, EphrinA2, EphrinBl, or EphrinB2.
- the ligand may be thrombospondin.
- the thrombospondin may be TSP-1 or TSP-2.
- the ligand may be VEGF, PDGF, EGF, erythropoietin, interleukin, RANKL, FGF or NGF.
- the ligand may be VEGF-A, VEGF-B, VEGF-C, VEGF-D, VEGF-E, PDGF- A, PDGF-B, PDGF-C orPDGF-D.
- the ligand in the coiled coil chimeric molecule discussed above, may be angiopoietin- 1, angiopoietin-2, angiopoietin-3 or angiopoietin-4.
- the ligand may be angiopoietin- 1.
- the present invention is also directed to an isolated nucleic acid encoding a coiled coil chimeric molecule, which is discussed above. Further, the invention is directed to an expression vector that includes this nucleic acid. A host cell comprising the vector is also included within the purview ofthe invention. [0027]
- the present invention also includes a soluble biologically active multimer comprising the coiled coil chimeric molecule discussed above. In particular, the multimer may be a homomer or a heteromer. If the multimer is a heteromer, then it is preferred that the coiled coil domain be heterogeneous with respect to at least one specie.
- the multimer may be a dimer, trimer, tetramer, pentamer, hexamer, heptamer, octamer, nanomer or decamer and so on without limitation.
- the multimer may comprise coiled coil domains, which form parallel or anti-parallel structure.
- the present invention is also directed to a method of promoting cell growth comprising contacting a coiled coil chimeric molecule comprising a coiled-coil domain linked to a receptor binding domain of a ligand as described above, to a population of cells that express receptors that are specific for the ligand, wherein said ligand is an agonist for said receptor, and wherein a multimeric form ofthe coiled coil chimeric molecule interacts with the receptor, which results in cell growth promotion.
- the cells may be endothelial cells, hematopoietic cells or other cells that express each specific receptor.
- the present invention is directed to a method of promoting cell proliferation comprising contacting a coiled coil chimeric molecule comprising a coiled-coil domain linked to a receptor binding domain of a ligand as described above, to a population of cells that express receptors that are specific for the ligand, wherein said ligand is an agonist for said receptor, and wherein a multimeric form of the coiled coil chimeric molecule interacts with the receptor, which results in cell proliferation.
- the cells may be endothelial cells, hematopoietic cells or other cells that express each specific receptor.
- the present invention is directed to a method of decreasing or inhibiting cell proliferation comprising contacting a coiled coil chimeric molecule comprising a coiled-coil domain linked to a ligand binding domain of a receptor as described above, to a population of cells that express ligands that are specific for the receptor, wherein a multimeric form of the coiled coil chimeric molecule interacts with the ligand, which results in decrease or inhibition of cell proliferation.
- the cells may be endothelial cells, hematopoietic cells or other cells that express each specific receptor.
- the present invention is directed to a method of decreasing or inhibiting ligand activity comprising contacting a coiled coil chimeric molecule comprising a coiled-coil domain linked to a ligand binding domain of a receptor as described above, to a sample comprising a ligand that is specific for the receptor, wherem a multimeric form ofthe coiled coil chimeric molecule binds the ligand, which results in a decrease or inhibition of ligand activity.
- the present invention is directed to a method of making a chimeric molecule comprising: (A) recombinantly combining a nucleic acid encoding a coiled-coil domain with a nucleic acid encoding either a receptor binding region of a ligand or a ligand binding region of a receptor to produce a chimeric gene construct; and (B) expressing the gene construct in a host cell to produce the chimeric molecule.
- the invention is directed to a method of protecting endothelial cells against radiation damage to a mammal that has been exposed to irradiation, comprising administering a therapeutically effective amount of the coiled coil chimeric molecule described above to the mammal in need thereof.
- FIGURE 1 shows a schematic structure of angiopoietin- 1.
- Amino acids 1-19 are the secretory signal sequence (S)
- amino acids 158-255 are the coiled-coil oligomeric domain (CCOD)
- amino acids 226-283 are the linker (L)
- amino acids 284-498 are the fibrinogen-like domain (FLD).
- cysteines (C) at amino acids 41, 54, 265, 315, 435, 437, 439, and 452.
- FIGURES 2A-2C show nucleic acid sequence (SEQ ID NO:l) and deduced amino acid sequence (SEQ ID NO:2) of Angl/FD (fibrinogen-like domain of Angl).
- FIGURES 3A-3D show nucleic acid sequence (SEQ ID NO:3) and deduced amino acid sequence (SEQ ID NO:4) of GCN4/CC-Angl/FD (coiled-coil domain of GCN4-Angl/FD).
- FIGURES 4A-4D show nucleic acid sequence (SEQ ID NO:5) and deduced amino acid sequence (SEQ ID NO:6) of CMP/CC-Angl/FD (coiled-coil domain of CMP-
- FIGURES 5A-5D show nucleic acid sequence (SEQ ID NO:7) and deduced amino acid sequence (SEQ ID NO: 8) of COMP/CC-Angl/FD (coiled-coil domain of COMP-Angl/FD).
- FIGURE 6 shows a schematic diagram for generation of gene constructs for multimeric chimeric-Angl .
- M stands for multiple cloning site.
- FIGURE 7 shows a schematic diagram of native Angl, GCN4-Angl/FD, MAT-Angl/FD, and COMP-Angl/FD.
- FIGURES 8A-8B show that Angl variants produce lower-order oligomers.
- FIGURE 8 A shows molecular weight analysis of recombinant native Angl, Angl/FD, CC-Angl, GCN4-Angl MAT/CC-Angl, and COMP/CC-Angl under reducing (R) and non-reducing (NR) conditions. Numbers and bars indicate molecular sizes (kDa). 100 ng of each recombinant protein (reduced and non-reduced) is separated by 4-15% sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), and electro-blotted to nitrocellulose membranes.
- SDS-PAGE sodium dodecyl sulfate-polyacrylamide gel electrophoresis
- FIGURE 8B shows glycerol sprayed/low-angle rotary metal-shadowed specimens that were imaged by TEM.
- Native Angl reveals variable-sized multimers of the basic 'mushroom-shaped' trimeric structure.
- CC-Angl reveals trimers
- GCN4-Angl reveals dimers
- MAT- Angl reveals mostly tetramer
- COMP-Angl reveals mostly pentamers.
- FIGURE 9 shows in vitro binding assay between recombinant native Angl, Angl/FD, CC-Angl, GCN4-Angl MAT/CC-Angl, and COMP/CC-Angl and soluble Tiel-Fc (sTiel-Fc, Tl) and soluble Tie2-Fc (sTie2-Fc, T2).
- Tiel-Fc soluble Tiel-Fc
- T2 soluble Tie2-Fc
- FIGURES 10A - 10D show in vitro binding assay between recombinant native Angl, GCN4-Angl/FD, MAT-Angl /FD, or COMP-Angl/FD and immobilized soluble Tie2-Fc using Biacore assay.
- Each recombinant protein was passed over a Biacore sensor chip that had extracellular domain of Tie2-Fc and Fc protein covalently coupled to it, followed by dissembling in absence of the recombinant proteins. Concentrations of the recombinant proteins are shown in each panel. Specificity of binding was assessed by substracting Fc protein binding value from Tie2-Fc binding value during the measurement. Binding of the sensor chip is provided in resonance units (RUs).
- RUs resonance units
- FIGURE 11 shows BIAcore analysis of native Angl (NA), GCN4-Angl (G), MAT-Angl (M) or COMP-Angl (C) with sTie2-Fc immobilized on a chip. Typical sensogram showing the association and dissociation profile of 60 nM of recombinant protein. An equal amount of VEGF was used as a control.
- FIGURES 12A-12B show comparison of native Angl (N), GCN4-Angl (G), MAT-Angl (M) or COMP-Angl (C) in a Tie2 phosphorylation assay using human umbilical venous endothelial cells (HUVECs).
- Serum-starved HUVECs were treated with 200 ng/ml of native Angl or 100 ng/ml of Angl variants for 10 min (A), or the indicated times (B) and the phosphorylations of Tie2 were measured.
- the relative ratio of phospho- Tie2 ( ⁇ Tie2) to Tie2 at time 0 is arbitrarily presented as 1. Numbers represent the mean + S.D. from 3 experiments. *, P ⁇ 0.05 versus CB. #, P ⁇ 0.05 versus NA.
- the cells were harvested in extraction buffer, and 0.5 mg of protein was used for hnmunoprecipitation.
- FIGURES 13A-13C show comparison of native Angl, GCN4-Angl/FD, MAT-Angl/FD, or COMP-Angl/FD in Akt (Ser473) phosphorylation assay in HUVECs. In each panel, upper band indicates that the Western blots were probed with anti-phospho- Akt (Ser473) antibody.
- HUVECs were incubated with control buffer (CB), and 200 ng of native Angl (N), GCN4-Angl/FD (G), MAT-Angl/FD (M), or COMP-Angl/FD (C) for 15 min.
- B HUVECs were incubated with control buffer (CB) and indicated amount of COMP-Angl/FD.
- C HUVECs were incubated with 200 ng of COMP-Angl/FD for indicated times. After treatment, cell lysates were harvested. Each lane contains 50 ⁇ g of total protein from the cell lysates. Results were similar in three independent experiments.
- FIGURES 14A-14T show a comparison between native Angl, GCN4-Angl, MAT-Angl, and COMP-Angl in survival, migration, tube formation and sprouting activities of primary cultured endothelial cells. Representative photographs are shown. Native Angl and MAT-Angl -induced notable increase in survival, migration, tube formation and sprouting activities.
- FIGURES 15A-15D show quantification of biological activities.
- CB control buffer
- NA native Angl
- G GCN4-Angl
- M MAT-Angl
- C COMP-Angl. *, PO.05 versus CB. #, PO.05 versus NA (200 ng/ml).
- FIGURES 16A-16D show that COMP-Angl alone produces angiogenesis in the mouse corneal micropocket assay.
- A Macroscopic photographs of mouse corneas. Corneal ' angiogenesis was not observed with control buffer (CB) or with native Angl. COMP-Angl induced corneal angiogenesis extending from the limbus across the cornea.
- B left panels show in situ BS-1 lectin fluorescent staining of corneal limbus vessels 6 days after pellet implantation. COMP-Angl increased the diameter of the limbar artery, while CB and native Angl induced no changes.
- B right panels show hematoxylin and eosin staining confirms that COMP-Angl induced angiogenesis with significant vessel formation.
- FIGURES 17A-17F show acute injection of COMP-Angl induces Tie2 phosphorylation in lung.
- A shows distribution of Tie2 in several organs including brain (B), heart (H), lung (Lu), liver (Li), kidney (K), small intestine (I), spleen (S), and ear (E) of adult mice.
- Protein lysates from each organ were immunoprecipitated and immunoblotted with anti-Tie2 antibody (upper panel). Each protein lysate was also immunoblotted with anti-actin antibody to verify equal amounts of total protein loaded (lower panel).
- B-D show in vivo phosphorylation of Tie2 stimulated by i.v. injection of native Angl (60 ⁇ g) or COMP-Angl (30 ⁇ g) assayed at the indicated times after injection.
- Tie2 was immunoprecipitated from lung protein lysate and immunoblotted with anti- phosphotyrosine to detect phosphorylated Tie2 (B, C-pTie2, upper panels).
- the membrane was stripped and reprobed with anti-Tie2 antibody (lower panels) to verify equal loading of protein in each lane.
- D the relative ratio measured at time 0 is arbitrarily presented as 1. Dots represent the mean + S.D. from 5 experiments. *, PO.05 versus native Angl.
- E-F show j jtnmunohistochemical staining of Tie2 counterstained with methyl green (E) and PECAM-1 counterstained with Meyer's hematoxylin (F). Most Tie2 staimng corresponds to PECAM staining.
- White arrows indicate large blood vessels with positive staining. Gray arrows indicate bronchioles with negative staining.
- FIGURES 18 A-181 show that COMP-Angl protects against radiation-induced microvascular apoptosis and death.
- A-G show mice which were given whole-body irradiation with 15 Gy and sacrificed after 4 hrs. While small intestinal villi and crypts from control mice have almost no apoptosis (A, E), villi and crypts from irradiated mice reveal extensive apoptosis (arrows) in lamina intestinal cells (B, F). IN. injection of COMP- Angl markedly reduced radiation-induced apoptosis in lamina limba cells but not in cells of crypts (C, G).
- Co-staining of PECAM-1 (gray-pastel colors; arrow heads) and TU ⁇ EL (dark brown; arrows) allows for counting the number of apoptotic endothelial cells among the lamina propria cells (D).
- H shows frequency histograms of percent of apoptotic endothelial cells in the lamina propria of approximately 1,000 villi from each group. Small intestinal specimens were obtained 4 hrs after 15 Gy irradiation with or without i.v. injection of COMP-Angl. Data represent mean scores from 5 experiments.
- the present ' invention also provides for methods of using coiled-coil domains for "multimerizing" soluble receptors, which functions to make otherwise inactive soluble receptors biologically active, or which enhances the biological and binding activity of receptors that, absent such multimerization, would have lower levels of biological and binding activity.
- This method may be used to multimerize ligand binding domains using any receptor, which has improved affinity and/or increased activity (i.e. binding) when they were multimerized as compared to the native form ofthe soluble receptor.
- “about” or “substantially” generally provides a leeway from being limited to an exact number.
- polypeptide sequence As used in the context of the length of a polypeptide sequence, "about” or “substantially” indicates that the polypeptide is not to be limited to the recited number of amino acids. A few amino acids add to or subtracted from the N-terminus or C-terminus may be mcluded so long as the functional activity such as its binding activity is present.
- ⁇ administration "in combination with” one or more further therapeutic agents includes simultaneous (concurrent) and consecutive administration in any order.
- agonist refers to a ligand that bmds to a receptor, which activates the receptor and stimulates physiologic activity.
- Angl is considered to be an agonist of Tie2 receptor.
- amino acid and “amino acids” refer to all naturally occurring L- ⁇ -amino acids. This definition is meant to include norleucine, ornithine, and homocysteine.
- amino acid sequence variant refers to molecules with some differences in their amino acid sequences as compared to a reference (e.g. native sequence) polypeptide.
- the amino acid alterations may be substitutions, insertions, deletions or any desired combinations of such changes in a native amino acid sequence.
- Substitutional variants are those that have at least one amino acid residue in a native sequence removed and a different amino acid inserted in its place at the same position.
- the substitutions may be single, where only one amino acid in the molecule has been substituted, or they may be multiple, where two or more amino acids have been substituted in the same molecule.
- Substitutes for an amino acid within the sequence may be selected from other members of the class to which the amino acid belongs.
- the nonpolar (hydrophobic) amino acids include alanine, leucine, isoleucine, valine, proline, phenylalanine, tryptophan and methionine.
- the polar neutral amino acids include glycine, serine, threonine, cysteine, tyrosine, asparagine and glutamine.
- the positively charged (basic) amino acids include arginine, lysine and histidine.
- the negatively charged (acidic) amino acids include aspartic acid and glutamic acid.
- proteins or fragments or derivatives thereof which exhibit the same or similar biological activity and derivatives which are differentially modified during or after translation, e.g., by glycosylation, proteolytic cleavage, linkage to an antibody molecule or other cellular ligand, and so on.
- Insertional variants are those with one or more amino acids inserted immediately adjacent to an amino acid at a particular position in a native amino acid sequence. Immediately adjacent to an amino acid means connected to either the ⁇ -carboxy or ⁇ -amino functional group ofthe amino acid.
- Deletional variants are those with one or more amino acids in the native amino acid sequence removed. Ordinarily, deletional variants will have one or two amino acids deleted in a particular region of the molecule.
- antagonist refers to a ligand that tends to nullify the action of another ligand, as a ligand that binds to a cell receptor without eliciting a biological response.
- biologically active refers to the ability of a molecule to specifically bind to and signal tlirough a native receptor, e.g., a native Tie2 receptor, or to block the ability of a native Tie receptor (e.g., Tie2) to participate in signal transduction.
- a native receptor e.g., a native Tie2 receptor
- the (native and variant) ligands of the present mvention include agonists and antagonists of a native receptor, e.g. Tie2 receptor.
- Preferred biological activities of the ligands of the present invention include the ability to induce or inhibit vascularization. The ability to induce vascularization will be useful for the treatment of biological conditions and disease, where vascularization is desirable.
- the ability to inhibit or block vascularization may, for example, be useful in preventing or attenuating cell proliferation and tumor growth.
- Preferred biological activities of the ligands of the present invention include the ability to inhibit vascular permeability.
- the ability to inhibit vascular permeability will be useful for treatment of medical conditions and diseases such as diabetic retinopathy, edema, and ascites.
- Preferred biological activities of the ligands of the present invention include the ability to maintain endothelial cell integrity (including preventing apoptosis).
- the ability to maintain endothelial cell integrity will be useful for treatment of medical conditions and diseases such as mannitol treatment, irradiation, and sepsis.
- the biological activity ofthe chimeric receptor includes its ability to inhibit or competitively inhibit the ligand' s activity by binding to its ligand.
- cell proliferation may be inhibited if the ligand is an agonist for cell proliferation.
- administration of chimeric receptor may act as an enhancer of cell proliferation if the ligand is an antagonist for cell proliferation.
- chimeric ligand and chimeric receptor be labeled with a detectable label, such as radioisotope, fluorescent tag, enzymatic tag, or a chemiluminescent tag to determine ligand-receptor binding interaction.
- assay systems employing the chimeric molecule is also contemplated.
- carriers include pharmaceutically acceptable earners, excipients, or stabilizers which are nontoxic to the cell or mammal being exposed thereto at the dosages and concentrations employed.
- pharmaceutically acceptable carrier is an aqueous pH buffered solution.
- Examples of pharmaceutically acceptable carriers include without limitation buffers such as phosphate, citrate, and other organic acids; antioxidants including ascorbic acid; low molecular weight (less than about 10 residues) polypeptide; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyirolidone; amino acids such as glycine, glutamine, asparagine, arginine or lysine; monosaccharides, disaccharides, and other carbohydrates including glucose, mannose, or dextrins; chelating agents such as EDTA; sugar alcohols such as mannitol or sorbitol; salt-forming counterions such as sodium; and/or nonionic surfactants such as TWEEN ® , polyethylene glycol (PEG), and PLURONICS ® .
- buffers such as phosphate, citrate, and other organic acids
- antioxidants including ascorbic acid
- chimeric ligand refers to the combination of coiled coil domain and a receptor binding domain or a ligand binding domain.
- the resultant chimeric polypeptide is capable of forming biologically active multimers, which are soluble.
- the coiled coil domain may be derived from any source, including any animal or mammalian protein, and in particular any human protein, and further includes those that are synthetically made.
- the coiled coil domam and the ligand or receptor constructs may be from the same or different source.
- the chimeric construct comprises the coiled coil domain and a receptor binding domain of a ligand or a ligand binding domain of a receptor, and further may include other components that may be included so long their inclusion does not interfere with the formation of a biologically active multimer that has improved solubility, ease of recombinant production of the chimeric polypeptide and substantially similar or greater potency as the native ligand or native soluble receptor.
- FLAG sequence may be included for ease of purification, provided its inclusion does not interfere with the function ofthe chimeric molecule. The FLAG sequence also may be removed if a humanized construct is desired.
- "effective amount" is an amount sufficient to effect beneficial or desired clinical or biochemical results. An effective amount can be administered one or more times.
- an effective amount of an inhibitor compound is an amount that is sufficient to palliate, ameliorate, stabilize, reverse, slow or delay the progression of the disease state.
- fragments or “functional derivatives” refers to biologically active amino acid sequence variants and fragments of the native ligands or receptors of the present invention, as well as covalent modifications, including derivatives obtained by reaction with organic derivatizing agents, post-translational modifications, derivatives with nonproteinaceous polymers, and immunoadhesins.
- host cell includes an individual cell or cell culture which can be or has been a recipient of a vector of this invention.
- Host cells include progeny of a single host cell, and the progeny may not necessarily be completely identical (in morphology or in total DNA complement) to the original parent cell due to natural, accidental, or deliberate mutation and/or change.
- ligand refers to any molecule or agent, or compound that specifically binds covalently or transiently to a molecule such as a polypeptide.
- ligand may include antibody.
- ligand may refer to a molecule sought to be bound by another molecule with high affinity, such as in a ligand trap.
- ligand binding domain refers to the portion of the receptor that binds to the ligand and includes the minimal portion of the receptor that is necessary to bind its ligand.
- linked refers to direct or indirect connection between the multimerizing domain and the ligand or receptor. Both a direct fusion between these two domains or indirect fusion as by the domains being separated by a linker or an intervening domain or element are contemplated, so long as the activity of the chimeric fusion is present.
- mammal for purposes of treatment refers to any animal classified as a mammal, including humans, domestic and farm animals, and zoo, sports, or pet animals, such as dogs, cats, cattle, horses, sheep, pigs, and so on.
- the mammal is human.
- multimer or “multimeric” refers to the joining of the multimerizing agent such as the coiled coil domain to each other to fo ⁇ n a dimer, trimer, tetramer, pentamer, hexamer, heptamer, octamer, nanomer, decamer and so on, which may be in a parallel or anti-parallel fo ⁇ n, through intramolecular or intermolecular bonds.
- pharmaceutically acceptable carrier and/or diluent includes any and all solvents, dispersion media, coatings antibacterial and antifungal agents, isotonic and absorption delaying agents and the like.
- Dosage unit form refers to physically discrete units suited as unitary dosages for the mammalian subjects to be treated; each unit containing a predetermined quantity of active material calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier.
- the specification for the dosage unit fo ⁇ ns of the invention are dictated by and directly dependent on (a) the unique characteristics of the active material and the particular therapeutic effect to be achieved, and (b) the limitations inherent in the art of compounding such an active material for the treatment of disease in living subjects having a diseased condition in which bodily health is impaired.
- the principal active ingredient is compounded for convenient and effective administration in effective amounts with a suitable pharmaceutically acceptable carrier in dosage unit form.
- a unit dosage form can, for example, contain the principal active compound in amounts ranging from 0.5 ⁇ g to about 2000 mg. Expressed in proportions, the active compound is generally present in from about 0.5 ⁇ g/ml of carrier.
- receptor binding domain refers to the portion of the ligand that binds to the receptor and includes the minimal portion of the ligand that is necessary to bind its receptor.
- the present mvention is based on the discovery that a multimerizing agent, such as a coiled coil domain, which was previously perceived as a source of hindrance for isolating recombinant proteins containing them, has been found to provide advantageous features of easy recombinant protein expression and purification, greater solubility and greater or substantially equal potency compared with the native protein containing the coiled coil domain.
- sample or “biological sample” is referred to in its broadest sense, and includes any biological sample obtained from an individual, body fluid, cell line, tissue culture, or other source which may contain a chimeric Angl binding factor, depending on the type of assay that is to be perfo ⁇ ned.
- biological samples include body fluids, such as semen, lymph, sera, plasma, urine, synovial fluid, spinal fluid and so on. Methods for obtaining tissue biopsies and body fluids from mammals are well known in the art.
- the term “specifically binds” refers to a non-random binding reaction between two molecules, for example between an antibody molecule nmunoreacting with an antigen, or a non-antibody ligand reacting with another polypeptide, such as chimeric Angl specifically binding with Tie2.
- subject is a vertebrate, preferably a mammal, more preferably a human.
- treatment is an approach for obtaining beneficial or desired clinical results.
- beneficial or desired clinical results include, but are not limited to, alleviation of symptoms, diminishment of extent of disease, stabilized (i.e., not worsening) state of disease, delay or slowing of disease progression, amelioration or palliation of the disease state, and remission (whether partial or total), whether detectable or undetectable.
- Treatment can also mean prolonging survival as compared to expected survival if not receiving treatment.
- Treatment refers to both therapeutic treatment and prophylactic or preventative measures. Those in need of treatment include those already with the disorder as well as those in which the disorder is to be prevented. "Palliating" a disease means that the extent and/or undesirable clinical manifestations of a disease state are lessened and/or the time course of the progression is slowed or lengthened, as compared to a situation without treatment.
- a polynucleotide vector of this invention may be in any of several forms, including, but not limited to, RNA, DNA, RNA encapsulated in a retroviral coat, DNA encapsulated in an adenovirus coat, DNA packaged in anotiier viral or viral-like form (such as herpes simplex, and adeno-associated virus (AAV)), DNA encapsulated in liposomes, DNA complexed with polylysine, complexed with synthetic polycationic molecules, complexed with compounds such as polyethylene glycol (PEG) to immunologically "mask” the molecule and/or increase half- life, or conjugated to a non-viral protein.
- PEG polyethylene glycol
- the polynucleotide is DNA.
- DNA includes not only bases A, T, C, and G, but also includes any of their analogs or modified fo ⁇ ns of these bases, such as methylated nucleotides, internucleotide modifications such as uncharged linkages and thioates, use of sugar analogs, and modified and/or alternative backbone structures, such as polyamides.
- the present invention includes a multimer forming domain.
- coiled coil domain is exemplified.
- the coiled coil domain may be any amino acid sequence that forms a coiled coil structure.
- coiled coil domains herein are those cloned from a variety of proteins, it is understood that various mutations and derivatization are encompassed by the invention, so long as the resultant coiled coil domain is recognized by a person of skill in the art as a coiled coil structure and the coiled coil domain containing chimera is capable of forming a multimer, is easily soluble, and is able to provide similar or greater potency with respect to the native ligand or receptor.
- the multimerizing domain and the binding domain may be from the same protein, or they may be from different proteins.
- Angl coiled coil domain may be linked to its own fibrinogen-like domain in a more efficiently manner.
- a cartilage oligomeric matrix protein could be linked to the Angl fibrinogen- like domain.
- Angl portion referred to is the fibrinogen domain of Angl.
- MAT-Angl is also sometimes refe ⁇ ed to as CMP -Angl, CMP- Angl/FD, or CMP/CC-Angl/FD in the figures.
- Applicant has discovered that a chimeric form of Angl, COMP-Angl, has many potential advantages over the native protein. The generation of native Angl is difficult, and the activities of the purified proteins vary, possibly due to its tendency to form multimers.
- COMP- Angl could be the most biologically active among the variants because of its rapid association and dissociation rate.
- COMP-Angl may induce Tie2 clustering in endothelial caveolae more efficiently than the other recombinant Angl proteins.
- Our data indicate that Tie2 molecules are localized in endothelial caveolae.
- an engineered Angl protein with an oligomeric structure better suited to clustering Tie2 in caveolae may better facilitate Tie2 multimerization and phosphorylation.
- Angl failed to stimulate an angiogenic response when administered alone.
- Angl augmented postnatal angiogenesis.
- native Angl failed to stimulate an angiogenic response.
- COMP-Angl alone stimulates angiogenesis.
- COMP-Angl produced an increase in the luminal diameter of the basal limbus. This role is consistent with increased frequency of enlarged vessel diameters in Angl- overexpressing transgenic mice (Suri, C. et al. 1998, Science 282: 468-471; Thurston, G. et al. 1999, Science 286:2511-2514).
- COMP-Angl protein delivery may be useful for accurate and safe therapeutic angiogenesis.
- Integrity of the vascular endothelium in response to physical, biochemical, and immune-mediated damage is ⁇ nportant to maintaining endothelial function and preventing vascular diseases (Cines, D.B. et al. 1998, Blood 91:3527-3561).
- extensive apoptosis of microvascular endothelial cells of the lamina intestinal is the primary lesion initiating intestinal radiation damage (Paris, F. et al 2001, Science 293:293-297).
- GI tract damage during abdominal radiotherapy limits the dose that can be used during cancer treatment.
- VEGF vascular endothelial growth factor
- bFGF basic fibroblast growth factor
- VEGF receptors are expressed in endothelial cells that are actively involved in vasculogenesis and angiogenesis such as tumor progression
- bFGF receptors are expressed in both endothelial and non-endothelial cells including cancer cells (Paris, F. et al. 2001, Science 293:293-29; Veikkola, T. & Alitalo, K. 1999, Seminars in Cancer Biol.
- Tie2 is selectively expressed in active form in the endothelial cells of normal adult vessels (Wong, A.L. et al. 1997, Circ. Res. 81:567-574).
- angiopoietin/Tie2 system in normal adult blood vessels may be important in maintaining the integrity of non-proliferating endothelial cells (Kim, I. et al. 2001, Cardiovas. Res. 49:872-881).
- Our immunohistochemical staining indicates that Tie2 is selectively expressed in most endothelial cells of normal adult vessels and capillaries.
- Tie2 is effectively activated by acute administration of COMP-Angl.
- One concern is that repeated administration of Angl may increase tumor angiogenesis during radiation therapy.
- the role of Angl in tumor angiogenesis is still controversial. It has even been suggested that Angl may suppress tumor progression through 'stabilization' of tumor vessels (Tian, S. et al. 2002, Br. J. Cancer 286:645-651; Hawighorst, T. et al. 2002, Am. J. Pathol. 160:1381-1392). Therefore, using Angl for protection against radiation-induced endothelial cell damage could be ideal.
- COMP-Angl treatment strongly protects against extensive radiation-induced extensive endothelial apoptosis in villi, but has no observed effect on non-endothelial cells.
- COMP-Angl treatment prolongs survival periods, perhaps as a result of decreasing damage to the GI tract. Optimizing the dosage and route of administration of COMP-Angl could further improve endothelial cell survival following radiation-induced endothelial cell damage.
- COMP-Angl is superior to native Angl in several ways including efficiency of generation, potency, Tie2 activation in vivo, angiogenesis, and protection against endothelial injury in vivo. It seems likely that it can be further applied to the prevention of vascular leakage, protection against sepsis-induced endothelial cell injury, enhancement of re-endothelialization after angioplasty, and in vitro amplification of Tie2 positive endothelial precursor stem cells.
- Coiled Coil Coiled Coil
- ⁇ -helical coiled coil is probably the most widespread subunit oligomerization motif found in proteins. Accordingly, coiled coils fulfill a variety of different functions. In several families of transcriptional activators, for example, short leucine zippers play an important role in positioning the DNA-binding regions on the DNA (Ellenberger et al., 1992, Cell 71:1223-1237). Coiled coils are also used to fo ⁇ n oligomers of intermediate filament proteins. Coiled-coil proteins furthermore appear to play an important role in both vesicle and viral membrane fusion (Skehel and Wiley, 1998, Cell 95:871-874).
- the coiled coil is often used to control oligomerization. It is found in many types of proteins, including transcription factors such as, but not limited to GCN4, viral fusion peptides, SNARE complexes and certain tRNA synthetases, among others. Very long coiled coils are found in proteins such as tropomyosin, intermediate filaments and spindle-pole-body components.
- Coiled coils involve a number of ⁇ -helices that are supercoiled around each other in a highly organized manner that associate in a parallel or an antiparallel orientation. Although dimers and trimers are the most common.
- the helices may be from the same or from different proteins.
- the coiled-coil is formed by component helices coming together to bury their hydrophobic seams. As the hydrophobic seams twist around each helix, so the helices also twist to coil around each other, burying the hydrophobic seams and forming a supercoil. It is the characteristic interdigitation of side chains between neighbouring helices, known as knobs-into-holes packing, that defines the structure as a coiled coil.
- the helices do not have to run in the same direction for this type of interaction to occur, although parallel confo ⁇ nation is more common. Antiparallel confo ⁇ nation is very rare in trimers and unknown in pentamers, but more common in intramolecular dimers, where the two helices are often connected by a short loop.
- the heterotrimeric coiled-coil protein laminin plays an important role in the formation of basement membranes.
- Other examples are the thrombospondins and cartilage oligomeric matrix protein (COMP) in which tlxree (thrombospondms 1 and 2) or five (thrombospondins 3, 4 and COMP) chains are connected.
- the molecules have a flower bouquet-like appearance, and the reason for their oligomeric structure is probably the multivalent interaction of the C-terminal domains with cellular receptors.
- GCN4 cartilage oligomeric matrix protein
- the yeast transcriptional activator GCN4 is 1 of over 30 identified eukaryotic proteins containing the basic region leucine zipper (bZIP) DNA-binding motif (Ellenberger et al., 1992, Cell 71:1223-1237).
- the bZIP dimer is a pair of continuous alpha helices that fonn a parallel coiled-coil over their carboxy-terminal 34 residues and gradually diverge toward their amino te ⁇ nini to pass through the major groove of the DNA binding site.
- the coiled-coil dimerization interface is oriented almost perpendicular to the DNA axis, giving the complex the appearance of the letter T.
- bZIP contains a 4-3 heptad repeat of hydrophobic and nonpolar residues that pack together in a parallel alpha- helical coiled-coil (Ellenberger et al., 1992, Cell 71:1223-1237).
- the stability of the dimer results from the side-by-side packing of leucines and nonpolar residues in positions a and d of the heptad repeat, as well as a limited number of intra- and interhelical salt bridges, shown in a crystal structure of the GCN4 leucine zipper peptide (Ellenberger et al., 1992, Cell 71:1223-1237).
- Cartilage Matrix Protein (CMP or MAT)
- CMP (matrilin-1) was isolated from bovine tracheal cartilage as a homotrimer of subunits of M r 52,000 (Paulsson and Heinegard, 1981, Biochem J. 197:367-375), where each subunit consists of a vWFAl module, a single EGF domain, a vWFA2 module and a coiled coil domain spanning five heptads (Kiss et al, 1989, J. Biol. Chem. 264:8126- 8134; Hauser and Paulsson, 1994, J. Biol. Chem. 269:25747-25753).
- Electron microscopy of purified CMP showed a bouquet-like trimer structure in which each subunit forms an ellipsoid emerging from a common point co ⁇ esponding to the coiled coil (Hauser and Paulsson, 1994, J. Biol. Chem. 269:25747-25753).
- the coiled coil domain in matrilin-1 has been extensively studied.
- the trimeric structure is retained after complete reduction of interchain disulfide bonds under non-denaturing conditions (Hauser and Paulsson, 1994, J. Biol. Chem. 269:25747-25753).
- Cartilage Oligomeric Matrix Protein [00107] A non-collagenous glycoprotein, COMP, was first identified in cartilage (Hedbom et al, 1992, J.Biol.Chem. 267:6132-6136). The protein is a 524 kDa homopentamer of five subunits which consists of an N-terminal heptad repeat region (cc) followed by four epidermal growth factor (EGF)-like domains (EF), seven calcium- binding domains (T3) and a C-terminal globular domain (TC). According to this domain organization, COMP belongs to the family of thrombospondins.
- the present invention also provides for a nucleic acid encoding a fusion polypeptide wherem the fusion polypeptide comprises a first subunit comprising at least one copy of the receptor binding domain of a ligand, the first subunit being fused to the C- terminal end of a multimerizing component.
- the present invention provides for a nucleic acid encoding a fusion polypeptide wherein the fusion polypeptide comprises a first subunit comprising at least one copy of the receptor binding domain of a ligand, the first subunit being fused to the N-terminal end of a multimerizing component.
- the multimerizing component may be the coiled coil domain.
- the present invention also provides for a nucleic acid encoding a fusion polypeptide wherem the fusion polypeptide comprises a first subunit comprising at least one copy of the ligand binding domain of a receptor, the first subunit being fused to the C- terminal end of a multimerizing component.
- the present mvention provides for a nucleic acid encoding a fusion polypeptide wherein the fusion polypeptide comprises a first subunit comprising at least one copy of the ligand binding domain of a receptor, the first subunit being fused to the N-terminal end of a multimerizing component.
- the multimerizing component may be the coiled coil domain.
- an expression vector comprising a nucleic acid molecule of the invention as described herein, wherein the nucleic acid molecule is operatively linked to an expression control sequence.
- a host-vector system for the production of a fusion polypeptide which comprises the expression vector ofthe invention which has been introduced into a host cell suitable for expression of the fusion polypeptide.
- the suitable host cell may be a bacterial cell such as E. coli, a yeast cell, such as Pichia pastoris, an insect cell, such as Spodoptera frugiperda, or a mammalian cell, such as a COS or CHO cell.
- the present invention also provides for methods of producing the fusion polypeptides of the mvention by growing cells ofthe host- vector system described herein, under conditions permitting production of the fusion polypeptide and recovering the fusion polypeptide so produced.
- the fusion polypeptides useful for practicing the present invention may be prepared by expression in a prokaryotic or eukaryotic expression system.
- the recombinant gene may be expressed and the polypeptide purified utilizing any number of methods.
- the gene may be subcloned into a bacterial expression vector, such as for example, but not by way of limitation, pZErO.
- the fusion polypeptides may be purified by any technique which allows for the subsequent fo ⁇ nation of a stable, biologically active protein.
- the factors may be recovered from cells either as soluble proteins or as inclusion bodies, from which they may be extracted quantitatively by 8M guanidinium hydrochloride and dialysis.
- any number of purification methods may be used, including but not limited to conventional ion exchange chromatography, affinity chromatography, different sugar chromatography, hydrophobic interaction chromatography, reverse phase chromatography or gel filtration.
- fusion polypeptide includes functionally equivalent molecules in which amino acid residues are substituted for residues within the sequence resulting in a silent or conservative change.
- one or more amino acid residues within the sequence can be substituted by another amino acid of a similar polarity which acts as a functional equivalent, resulting in a silent or conservative alteration.
- Substitutes for an amino acid within the sequence may be selected from other members of the class to which the amino acid belongs.
- the nonpolar (hydrophobic) amino acids include alanine, leucine, isoleucine, valine, proline, phenylalanine, tryptophan and methionine.
- the polar neutral amino acids include glycine, serine, threonine, cysteine, tyrosine, asparagine and glutamine.
- the positively charged (basic) amino acids include arginine, lysine and histidine.
- the negatively charged (acidic) amino acids include aspartic acid and glutamic acid.
- proteins or fragments or derivatives thereof which exhibit the same or similar biological activity and derivatives which are differentially modified during or after translation, e.g., by glycosylation, proteolytic cleavage, linkage to an antibody molecule or other cellular ligand, etc.
- Cells that express the fusion polypeptides of the invention are genetically engineered to produce them by, for example, transfection, transduction, electropration, or microinjection techniques.
- the present invention contemplates use of the fusion polypeptides described herein in tagged form.
- any of the methods known to one skilled in the art for the insertion of DNA fragments into a vector may be used to construct expression vectors encoding the fusion polypeptides ofthe invention using appropriate transcriptional/translational control signals and protein coding sequences. These methods may include in vitro recombinant DNA and synthetic techniques and in vivo recombinations (genetic recombination). Expression of nucleic acid sequence encoding the fusion polypeptides of the mvention may be regulated by a second nucleic acid sequence so that the fusion polypeptide is expressed in a host transformed with the recombinant DNA molecule.
- expression of the fusion polypeptides described herein may be controlled by any promoter/enhancer element known in the art.
- Promoters which may be used to control expression of the fusion polypeptide include, but are not limited to the long terminal repeat as described in Squinto et al., (1991, Cell 65:1-20); the SV40 early promoter region (Bemoist and Chambon, 1981, Nature 290:304-310), the CMV promoter, the M-MuLV 5' terminal repeat the promoter contained in the 3'long terminal repeat of Rous sarcoma virus (Yamamoto, et al., 1980, Cell 22:787-797), the herpes thymidine kinase promoter (Wagner et al., 1981, Proc.
- mouse mammary tumor virus control region which is active in testicular, breast, lymphoid and mast cells (Leder et al., 1986, Cell 45:485-495), albumin gene control region which is active in liver (Pinkert et al., 1987, Genes and Devel. 1:268-276), alpha- fetoprotein gene control region which is active in liver (Krumlauf et al., 1985, Mol. Cell. Biol. 5:1639-1648; Hammer et al., 1987, Science 235:53-58); alpha 1-antitrypsm gene control region which is active in the liver (Kelsey et al., 1987, Genes and Devel.
- beta-globin gene control region which is active in myeloid cells (Mogram et al, 1985, Nature 315:338-340; Kollias et al., 1986, Cell 46:89-94); myelin basic protein gene control region which is active in oligodendrocyte cells in the brain (Readhead et al., 1987, Cell 48:703-712); myosin light chain-2 gene control region which is active in skeletal muscle (Shani, 1985, Nature 314:283-286), and gonadotropic releasing hormone gene control region which is active in the hypothalamus (Mason et al., 1986, Science 234: 1372- 1378).
- expression vectors capable of being replicated in a bacterial or eukaryotic host comprising nucleic acids encoding a fusion polypeptide as described herein, and in particular modified angiopoietin, are used to transfect the host and thereby direct expression of such nucleic acid to produce fusion polypeptides which may then be recovered in biologically active form.
- a biologically active form includes a form capable of binding to the relevant receptor and causing a differentiated function and/or influencing the phenotype of the cell expressing the receptor. Such biologically active forms would, for example, induce phosphorylation of the tyrosine kinase domain of Tie2 receptor, or stimulation of synthesis of cellular DNA.
- Expression vectors containing the nucleic acid inserts can be identified by without limitation, at least three general approaches: (a) DNA-DNA hybridization, (b) presence or absence of "marker" gene functions, and (c) expression of inserted sequences.
- the presence of foreign nucleic acids inserted in an expression vector can be detected by DNA-DNA hybridization using probes comprising sequences that are homologous to an inserted nucleic acid sequences.
- the recombinant vector/host system can be identified and selected based upon the presence or absence of certain "marker" gene functions (e.g., thymidine kinase activity, resistance to antibiotics, transformation phenotype, occlusion body formation in baculovirus, etc.) caused by the insertion of foreign nucleic acid sequences in the vector. For example, if an efl nucleic acid sequence is inserted within the marker gene sequence of the vector, recombinants containing the insert can be identified by the absence of the marker gene function.
- recombinant expression vectors can be identified by assaying the foreign nucleic acid product expressed by the recombinant constructs.
- Such assays can be based, for example, on the physical or functional properties of the nucleic acid product of interest, for example, by binding of a ligand to a receptor or portion thereof which may be tagged with, for example, a detectable antibody or portion thereof or binding to antibodies produced against the protein of interest or a portion thereof.
- the fusion polypeptide in particular modified angiopoietin of the present invention, may be expressed in the host cells transiently, constitutively or permanently.
- the invention herein further provides for the development of a fusion polypeptide as a therapeutic agent for the treatment of patients suffering from disorders involving cells, tissues or organs which express the Tie2 receptor.
- Such molecules may be used in a method of treatment ofthe human or animal body, or in a method of diagnosis.
- Tie2 receptor has been identified in association with endothelial cells and, blocking of agonists of the receptor such as Ang-1 has been shown to prevent vascularization
- Tie2 agonist fusion polypeptides of the invention may be useful for the induction of vascularization in diseases or disorders where such vascularization is indicated. Such diseases or disorders would include wound healing, ischemia and diabetes.
- the ligands may be tested in animal models and used therapeutically as described for other agents, such as vascular endothelial growth factor (VEGF), which is another endothelial cell-specific angiogenic factor.
- VEGF vascular endothelial growth factor
- the agonist fusion polypeptides may be used alone or in combination with one or more additional pharmaceutically active compounds such as, for example, VEGF or basic fibroblast growth factor (bFGF).
- additional pharmaceutically active compounds such as, for example, VEGF or basic fibroblast growth factor (bFGF).
- VEGF vascular endothelial growth factor
- bFGF basic fibroblast growth factor
- antagonists of the Tie2 receptor such as Tie2 receptorbodies or Ang-2 as described in Example 9 in WO 96/31598, have been shown to prevent or attenuate vascularization in certain situations and in certain amounts.
- Tie2 antagonist fusion polypeptides of the mvention would also be useful for those purposes. These antagonists may be used alone or in combination with other compositions, such as anti-VEGF antibodies, that have been shown to be useful in treating conditions in which the therapeutic intent is to block angiogenesis.
- the Tie2 agonist fusion polypeptides of the mvention described herein may be used as hematopoietic factors.
- a variety of hematopoietic factors and their receptors are involved in the proliferation and/or differentiation and/or migration of the various cells types contained within blood. Because Tie2 receptors are expressed in early hematopoietic cells, the Tie2 ligands are expected to play a comparable role in the proliferation or differentiation or migration of these cells.
- Tie2 agonist fusion polypeptide compositions may be prepared, assayed, examined in in vitro and in vivo biological systems and used therapeutically as described in any of the following: U.S. Patent No.
- the fusion polypeptides may be used to diagnose or treat conditions in which normal hematopoiesis is suppressed, including, but not limited to anemia, thrombocytopenia, leukopenia and granulocytopenia.
- the fusion polypeptides may be used to stimulate differentiation of blood cell precursors in situations where a patient has a disease, such as acquired immune deficiency syndrome (AIDS), which is associated with reduction in no ⁇ nal blood cell levels, or in clinical settings in which enhancement of hematopoietic populations is desired, such as in conjunction with bone ma ⁇ ow transplant, or in the treatment of aplasia or myelosuppression caused by radiation, chemical treatment or chemotherapy.
- AIDS acquired immune deficiency syndrome
- the fusion polypeptides of the present invention may be used alone, or in combination with other pharmaceutically active agents such as, for example, cytokines, neurotrophins, interleukins, etc.
- the fusion polypeptides may be used in conjunction with any of a number of factors which are known to induce stem cell or other hematopoietic precursor proliferation, or factors acting on later cells in the hematopoietic pathway, including, but not limited to, hemopoietic maturation factor, thrombopoietin, stem cell factor, erythropoietin, G-CSF, GM-CSF and so on.
- Tie2 receptor antagonist fusion polypeptides are used to diagnose or treat patients in which the desired result is inhibition of a hematopoietic pathway, such as for the treatment of myeloproliferative or other proliferative disorders of blood forming organs such as thrombocythemias, polycythemias and leukemias.
- treatment may comprise use of a therapeutically effective amount ofthe fusion polypeptides as described herein.
- Effective doses useful for treatmg these or other diseases or disorders may be determined using methods known to one skilled in the art (see, for example, Fingl, et al, The Pharmacological Basis of Therapeutics, Goodman and Gilman, eds. Macmillan Publishing Co, New York, pp. 1-46 (1975).
- Pharmaceutical compositions for use according to the mvention include the fusion polypeptides described above in a pharmacologically acceptable liquid, solid or semi-solid carrier, linked to a earner or targeting molecule (e.g., antibody, hormone, growth factor, etc.) and/or incorporated into liposomes, microcapsules, and controlled release preparation prior to administration in vivo.
- the pharmaceutical composition may comprise a fusion polypeptide in an aqueous solution, such as sterile water, saline, phosphate buffer or dextrose solution.
- the active agents may be comprised in a solid (e.g. wax) or semi-solid (e.g. gelatinous) formulation that may be implanted into a patient in need of such treatment.
- the administration route may be any mode of administration known in the art, including but not limited to intravenously, intrathecally, subcutaneously, intrauterinely, by injection into involved tissue, intraarterially, intranasally, orally, or via an implanted device. [00133] Administration may result in the distribution of the active agent of the invention throughout the body or in a localized area.
- intravenous or intrathecal administration of agent may be desirable.
- an implant containing active agent may be placed in or near the lesioned area.
- Suitable implants include, but are not limited to, gelfoam, wax, spray, or microparticle-based implants.
- the present mvention also provides for pharmaceutical compositions comprising the fusion polypeptides described herein, in a pharmacologically acceptable vehicle.
- the compositions may be administered systemically or locally. Any appropriate mode of administration known in the art may be used, incuding, but not limited to, intravenous, intrathecal, mtraarterial, intranasal, oral, subcutaneous, intraperitoneal, or by local injection or surgical implant. Sustained release formulations are also provided for.
- Gene Therapy is also provided for example, in some conditions which involve distant regions of the nervous system.
- an implant containing active agent may be placed in or near the lesioned area.
- Suitable implants include, but are not limited to, gelfoam, wax, spray, or
- nucleic acids comprising sequences encoding the chimeric Angl polypeptide are administered to prevent vascular leakage, and for therapeutic vasculogenesis, by way of gene therapy.
- Gene therapy refers to therapy performed by the administration to a subject of an expressed or expressible nucleic acid.
- the nucleic acids produce their encoded protein that mediates a therapeutic effect.
- nucleic acid sequences may encode a chimeric-Angl or Tie2 polypeptide, in which the nucleic acid sequences are part of expression vectors that express the polypeptides in a suitable host.
- nucleic acid sequences have promoters operably linked to the polypeptide coding region, said promoter being inducible or constitutive, and, optionally, tissue-specific.
- nucleic acid molecules are used in which the polypeptide coding sequences and any other desired sequences are flanked by regions that promote homologous recombination at a desired site in the genome, thus providing for intrachromosomal expression of the antibody encoding nucleic acids (Roller and Smithies, Proc. Natl. Acad. Sci. USA 86:8932-8935 (1989); Zijlstra et al., Nature 342:435-438 (1989).
- Delivery of the nucleic acids into a patient may be either direct, in which case the patient is directly exposed to the nucleic acid or nucleic acid- carrying vectors, or indirect, in which case, cells are first transformed with the nucleic acids in vitro, then transplanted into the patient. These two approaches are known, respectively, as in vivo or ex vivo gene therapy.
- the nucleic acid sequences are directly administered in vivo, where it is expressed to produce the encoded product.
- This can be accomplished by any of numerous methods known in the art, e.g., by constructing them as part of an appropriate nucleic acid expression vector and administering it so that they become intracellular, e.g., by infection using defective or attenuated retrovirals or other viral vectors, or by direct injection of naked DNA, or coating with lipids or cell-surface receptors or transfecting agents, encapsulation in liposomes, microparticles, or microcapsules, or by administering them in linkage to a peptide which is known to enter the nucleus, by administering it in linkage to a ligand subject to receptor-mediated endocytosis (see, e.g., Wu and Wu, J.
- nucleic acid-ligand complexes can be formed in which the ligand comprises a fusogenic viral peptide to disrupt endosomes, allowing the nucleic acid to avoid lysosomal degradation.
- the nucleic acid can be targeted in vivo for cell specific uptake and expression, by targeting a specific receptor.
- the nucleic acid can be introduced intracellularly and incorporated within host cell DNA for expression, by homologous recombination (Roller and Smithies, Proc. Natl. Acad. Sci.
- viral vectors that contain nucleic acid sequences encoding the polypeptide are used.
- the nucleic acid sequences encoding the polypeptide to be used in gene therapy are cloned into one or more vectors, which facilitates delivery of the gene into a patient.
- Retro viral vectors, adenoviral vectors and adeno-associated viruses are examples of viral vectors that may be used. Retroviral vectors contain the components necerney for the co ⁇ ect packaging of the viral genome and integration into the host cell DNA.
- Adenoviruses are especially attractive vehicles for delivering genes to respiratory epithelia because they naturally infect respiratory epithelia where they cause a mild disease.
- Other targets for adenovirus-based delivery systems are liver, the central nervous system, endothelial cells, and muscle.
- Adenoviruses have the advantage of being capable of infecting non-dividing cells.
- adeno-associated virus AAV has also been proposed for use in gene therapy.
- Another approach to gene tiierapy involves transfe ⁇ ing a gene to cells in tissue culture by such methods as electroporation, lipofection, calcium phosphate mediated transfection, or viral infection. Usually, the method of transfer includes the transfer of a selectable marker to the cells. The cells are then placed under selection to isolate those cells that have taken up and are expressing the transferred gene. Those cells are then delivered to a patient.
- the nucleic acid is introduced into a cell prior to administration in vivo of the resulting recombinant cell.
- introduction can be can ⁇ ed out by any method known in the art, including but not limited to transfection, electroporation, microinjection, infection with a viral or bacteriophage vector containing the nucleic acid sequences, cell fusion, chromosome-mediated gene transfer, microcell- mediated gene transfer, spheroplast fusion and so on.
- Numerous techniques are Icnown in the art for the introduction of foreign genes into cells and may be used in accordance with the present mvention, provided that the necerney developmental and physiological functions of the recipient cells are not disrupted.
- the technique should provide for the stable transfer of the nucleic acid to the cell, so that the nucleic acid is expressible by the cell and preferably heritable and expressible by its cell progeny.
- Cells into which a nucleic acid can be introduced for purposes of gene therapy encompass any desired, available cell type, and include but are not limited to epithelial cells, endothelial cells, keratinocytes, fibroblasts, muscle cells, hepatocytes; blood cells such as T-lymphocytes, B -lymphocytes, monocytes, macrophages, neutrophils, eosinophils, megakaryocytes, granulocytes; various stem or progenitor cells, in particular hematopoietic stem or progenitor cells, e.g., as obtamed from bone marrow, umbilical cord blood, peripheral blood, fetal liver, and so on.
- the cell used for gene therapy is autologous to the patient.
- nucleic acid sequences encoding the polypeptide are introduced into the cells such that they are expressible by the cells or their progeny, and the recombinant cells are then administered in vivo for therapeutic effect.
- stem or progenitor cells are used. Any stem and/or progenitor cells which can be isolated and maintained in vitro can potentially be used in accordance with this embodiment ofthe present invention.
- the nucleic acid to be introduced for purposes of gene therapy comprises an inducible promoter operably linked to the coding region, such that expression ofthe nucleic acid is controllable by controlling the presence or absence of the appropriate inducer of transcription.
- the present invention relates to treatment for various diseases that are characterized by vascular leakage or lack of blood vessel formation.
- inventive therapeutic compound may be administered to human patients who are either suffering from, or prone to suffer from the disease by providing compounds that activate Tie2.
- the formulation of therapeutic compounds is generally known in the art and reference can conveniently be made to Remington's Pharmaceutical Sciences, 17th ed., Mack Publishing Co., Easton, Pa., USA. For example, from about 0.05 ⁇ g to about 20 mg per kilogram of body weight per day may be administered. Dosage regime may be adjusted to provide the optimum therapeutic response. For example, several divided doses may be administered daily or the dose may be proportionally reduced as indicated by the exigencies of the therapeutic situation.
- the active compound may be administered in a convenient manner such as by the oral, intravenous (where water soluble), intramuscular, subcutaneous, intra nasal, intradermal or suppository routes or implanting (eg using slow release molecules by the intraperitoneal route or by using cells e.g.
- the peptide may be required to be coated in a material to protect it from the action of enzymes, acids and other natural conditions which may inactivate said ingredients.
- the low lipophilicity of the peptides will allow them to be destroyed in the gastrointestinal tract by enzymes capable of cleaving peptide bonds and in the stomach by acid hydrolysis.
- they will be coated by, or administered with, a material to prevent its inactivation.
- peptides may be administered in an adjuvant, co-administered with enzyme inhibitors or in liposomes.
- Adjuvants contemplated herein include resorcinols, non-ionic surfactants such as polyoxyethylene oleyl ether and n-hexadecyl polyethylene ether.
- Enzyme inhibitors include pancreatic trypsin inhibitor, diisopropylfluorophosphate (DEP) and trasylol.
- Liposomes include water-in-oil-in-water CGF emulsions as well as conventional liposomes.
- the active compounds may also be administered parenterally or intraperitoneally.
- Dispersions can also be prepared in glycerol liquid polyethylene glycols, and mixtures thereof and in oils. Under ordinary conditions of storage and use, these preparations contain a preservative to prevent the growth of microorganisms.
- the pharmaceutical forms suitable for injectable use include sterile aqueous solutions (where water soluble) or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion. In all cases the form must be sterile and must be fluid to the extent that easy syringability exists.
- the carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol and liquid polyethylene glycol, and the like), suitable mixtures thereof, and vegetable oils.
- the proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of superfactants.
- the prevention of the action of microorganisms can be brought about by various antibacterial and antifungal agents, for example, chlorobutanol, phenol, sorbic acid, theomersal and the like. In many cases, it will be preferable to include isotonic agents, for example, sugars or sodium chloride. Prolonged absorption ofthe injectable compositions can be brought about by the use in the composition of agents delaying absorption, for example, aluminium monostearate and gelatin.
- Sterile injectable solutions are prepared by incorporating the active compounds in the required amount in the appropriate solvent with various other ingredients enumerated above, as required, followed by filtered sterilization.
- dispersions are prepared by incorporating the various sterile active ingredient into a sterile vehicle which contains the basic dispersion medium and the required other ingredients from those enumerated above.
- the preferred methods of preparation are vacuum drying and the freeze-drying technique which yield a powder of the active ingredient plus any additional desired mgredient from a previously sterile-filtered solution thereof.
- the active compound may be orally administered, for example, with an inert diluent or with an assimilable edible carrier, or it may be enclosed in hard or soft shell gelatin capsule, or it may be compressed into tablets, or it may be incorporated directly with the food of the diet.
- the active compound may be incorporated with excipients and used in the form of ingestible tablets, buccal tablets, troches, capsules, elixirs, suspensions, syrups, wafers, and the like. Such compositions and preparations should contain at least 1% by weight of active compound.
- compositions and preparations may, of course, be varied and may conveniently be between about 5 to about 80% of the weight of the unit.
- the amount of active compound in such therapeutically useful compositions is such that a suitable dosage will be obtained.
- Prefe ⁇ ed compositions or preparations according to the present invention are prepared so that an oral dosage unit form contains between about 0.1 ⁇ g and 2000 mg of active compound.
- the tablets, pills, capsules and the like may also contain the following: A binder such as gum tragacanth, acacia, corn starch or gelatin; excipients such as dicalcium phosphate; a disintegrating agent such as corn starch, potato starch, alginic acid and the like; a lubricant such as magnesium stearate; and a sweetening agent such as sucrose, lactose or saccharin may be added or a flavoring agent such as peppe ⁇ nint, oil of wintergreen, or cherry flavoring.
- a binder such as gum tragacanth, acacia, corn starch or gelatin
- excipients such as dicalcium phosphate
- a disintegrating agent such as corn starch, potato starch, alginic acid and the like
- a lubricant such as magnesium stearate
- a sweetening agent such as sucrose, lactose or saccharin may be added or a flavoring agent such as peppe ⁇ n
- any material used in preparing any dosage unit form should be pharmaceutically pure and substantially non-toxic in the amounts employed.
- the active compound may be incorporated into sustained-release preparations and formulations.
- Various delivery systems are known and can be used to administer a compound of the invention, e.g., encapsulation in liposomes, microparticles, microcapsules, recombinant cells capable of expressing the compound, receptor-mediated endocytosis, construction of a nucleic acid as part of a retroviral or other vector, etc.
- Methods of introduction include but are not limited to intradermal, intramuscular, intraperitoneal, intravenous, subcutaneous, intranasal, epidural, and oral routes.
- the compounds or compositions may be administered by any convenient route, for example by infusion or bolus injection, by absorption through epithelial or mucocutaneous linings (e.g., oral mucosa, rectal and intestinal mucosa, etc.) and may be administered together with other biologically active agents. Administration can be systemic or local.
- Pulmonary administration can also be employed, e.g., by use of an inhaler or nebulizer, and formulation with an aerosolizing agent.
- the pharmaceutical compounds or compositions of the invention may be desirable to administer the pharmaceutical compounds or compositions of the invention locally to the area in need of treatment; this may be achieved by, for example, and not by way of limitation, local infusion during surgery, topical application, e.g., in conjunction with a wound dressing after surgery, by injection, by means of a catheter, by means of a suppository, or by means of an implant, said implant being of a porous, non-porous, or gelatinous material, including membranes, such as sialastic membranes, or fibers.
- a protein including an antibody or a peptide of the mvention, care must be taken to use materials to which the protein does not absorb.
- the compound or composition can be delivered in a vesicle, in particular a liposome.
- the compound or composition can be delivered in a controlled release system.
- a pump may be used.
- polymeric materials can be used.
- a controlled release system can be placed in proximity of the therapeutic target, thus requiring only a fraction ofthe systemic dose.
- Suitable enzyme labels include, for example, those from the oxidase group, which catalyze the production of hydrogen peroxide by reacting with substrate.
- Glucose oxidase is particularly prefe ⁇ ed as it has good stability and its substrate (glucose) is readily available.
- Activity of an oxidase label may be assayed by measuring the concentration of hydrogen peroxide formed by the enzyme-labeled antibody/substrate reaction.
- radioisotopes such as iodine ( I, 121 I), carbon ( 14 C), sulphur ( 35 S), tritium ( 3 H), indium ( 112 In), and technetium ( 99m Tc), and fluorescent labels, such as fluorescein and rhodamine, and biotin.
- suitable labels for the chimeric-Angl, Tie2 or chimeric Angl/Tie2 complex-specific antibodies of the present mvention are provided below.
- suitable enzyme labels include malate dehydrogenase, ⁇ -5-steroid isomerase, yeast-alcohol dehydrogenase, ⁇ -glycerol phosphate dehydrogenase, triose phosphate isomerase, peroxidase, alkaline phosphatase, asparaginase, glucose oxidase, ⁇ -galactosidase, ribonuclease, urease, catalase, glucose-6-phosphate dehydrogenase, glucoamylase, and acetylcholine esterase.
- radioisotopic labels examples include 3 H, ⁇ ⁇ In, I25 I, 131 I, 32 P, 35 S, 14 C, 51 Cr, 57 To, 58 Co, 59 Fe, 75 Se, I52 Eu, 90 Y, 67 Cu, 217 Ci, 21 I At, 212 Pb, 47 Sc, 109 Pd, etc.
- this radionucleotide has a more favorable gamma emission energy for imaging. For example,
- Examples of suitable non-radioactive isotopic labels include 157 Gd, 55 Mn, 162 Dy, 52 Tr , and 56 Fe.
- Examples of suitable fluorescent labels include an 152 Eu label, a fluorescein label, an isothiocyanate label, a rhodamine label, a phycoerythrin label, a phycocyanin label, an allophycocyanin label, an o-phthaldehyde label, and a fluorescamine label.
- Examples of suitable toxin labels include, Pseudomonas toxin, diphtheria toxin, ricin, and cholera toxin.
- chemiluminescent labels include a luminal label, an isolummal label, an aromatic acridinium ester label, an imidazole label, an acridinium salt label, an oxalate ester label, a luciferin label, a luciferase label, and an aequorin label.
- nuclear magnetic resonance contrasting agents include heavy metal nuclei such as Gd, Mn, and iron. Deuterium may also be used. Other contrasting agents also exist for EPR, PET or other imaging mechanisms, which are known to persons of skill in the art.
- Typical techniques for binding the above-described labels to polypeptides are provided by Kennedy et al. (1976) Clin. Chim. Acta 70:1-31, and Schurs et al. (1977) Clin. Chim. Acta 81: 1-40. Coupling techniques include the glutaraldehyde method, the periodate method, the dimaleimide method, the m-maleimidobenzyl-N-hydroxy- succinimide ester method, all of which methods are incorporated by reference herein. [00172]
- the polypeptides and antibodies of the present invention, including fragments thereof, may be used to detect chimeric-Angl, Tie2 or chimeric Angl/Tie2 complex using biocbip and biosensor technology.
- Biochip and biosensors of the present invention may comprise the polypeptides of the present invention to detect antibodies, which specifically recognize chimeric Angl/Tie2 complex.
- Bio chip and biosensors of the present invention may also comprise antibodies which specifically recognize the polypeptides of the present invention to detect chimeric Angl/Tie2 complex.
- EXAMPLE 2 - GENERATION OF GENE CONSTRUCTS FOR NATIVE ANGI The full cDNA of human Angl was amplified from human adult heart cDNA library (Clontech) by PCR for 30 cycles at an aimealing temperature of 52°C using sense (5 '-GTGCGGATTCACAATGACAGTTTTC-3 ' (SEQ ID NO:9), including BamHI restriction enzyme site; original 5'-GTGCGGCAGTACAATGACAGTTTTC-3' (SEQ ID NO: 10)) and antisense primers (5 '-GCTTTCAGATATCTAAAGGTCG AAT- ' (SEQ ID NO: 11), including EcoRV restriction enzyme site; original 5'- GCTTTCAAAAATCTAAAGGTCGAAT-3 ' (SEQ ID NO: 12)).
- PCR was perfo ⁇ ned on CMV-Angl-M-H for 25 cycles at an annealing temperature of 60°C using sense primer (5'-CAGAAAAGCTTGGGAGAAGATAT-3' (SEQ ID NO: 13)) and antisense primer (5'-TAGAAGGCACAGTCGAGGCTGA-3' (SEQ ID NO: 14)).
- sense primer 5'-CAGAAAAGCTTGGGAGAAGATAT-3' (SEQ ID NO: 13)
- antisense primer 5'-TAGAAGGCACAGTCGAGGCTGA-3' (SEQ ID NO: 14)
- the PCR products were subcloned into cloning vector pCR2.1 (Invitrogen) and sequenced. The insert was cut with Hindlll and Pmel, then subcloned into Hindlll and EcoRV sites in pFLAG-CMVl (Sigma). This vector was named 'native Angl'.
- Kammerer (Department of Structural Biology, University of Basel) provided cDNA encoding coiled-coil domain of yeast GCN4, chicken MAT, and rat COMP.
- PCR primers for coiled-coil domain of GCN4, CMP (MAT) and COMP including Bglll and BamHI restriction enzyme sites were designed.
- PCR was performed for 30 cycles at an annealing temperature of 52°C.
- PCR products were subcloned into cloning vector pZErO-2 (Invitrogen) and sequenced. It was named c pZErO-2CCD'.
- Sense and antisense nucleotides were annealed. The annealed reactants were ligated into the Hindlll and Xhol sites of the mammalian cell expression vector, pCDNA3.1 (Invitrogen). This vector was named 'pCDNA-Signal-FLAG', which was incubated with Bglll and BamHI. The released PCR fragment was inserted into BamHI digested pCDNA-Signal-FLAG. This vector was named 'pCDNA-Signal-FLAG-CC.
- PCR primers for the linker and fibrinogen domain of Angl including BamHI and Xhol restriction enzyme sites were designed.
- PCR was perfo ⁇ ned for 30 cycles at an aimealing temperature of 52°C.
- PCR products were subcloned into cloning vector pZErO-2 (InVitrogen) and sequenced. It was named 'pZErO-2Al'LF', which was incubated with BamHI and Xhol. The released
- FIG. 6 shows a schematic diagram for generating gene constructs for the multimeric chimeric-Angl .
- pCDNA-Signal-FLAG-human Angl (native Angl).
- sequence-verified by standard techniques using an ABI PRISM 3100 Genetic Analyzer (Applied Biosystems , Foster City, CA) and Taq Dideoxy Terminator Cycle Sequencing Kit using BigDye Terminator Cycle Sequencing version 2.0 (Applied Biosystems, Inc., Foster City, CA), ABI 373A DNA sequencer and subcloned into the mammalian expression vector pcDNA3.1 (Invitrogen, Inc.).
- bridging sequences described infra were introduced to provide convenient restriction sites and to give flexibility to the junctions between the domains, but there is no indication that there is a critical nature to these bridging sequences, though varying the length of the linker in some of these constructs led to some variation in the amount of protein produced.
- Native Angl consists of a preprotrypsin leader sequence (Met-Ser-Ala-Leu- Leu-Ile-Leu-Ala-Leu-Val-Gly-Ala-Ala-Ala (SEQ ID NO:25)) at its amino terminus to allow for secretion (bases 1-42), a FLAG tag sequence (Asp-Tyr-Lys-Asp-Asp-Asp-Asp- Lys (SEQ ID NO:26), bases 43-66), a bridging amino acid Leu (bases 67-69), the coding sequence of Angl (bases 70-1470), another bridging sequence consisting of the amino acids Asp-Ile-Gln-His-Ser-Gly-Gly-Arg-Ser-Ser-Leu-Glu-Gly-Pro-Arg-Phe (SEQ ID NO:27) (bases 1471-1518), and the Myc epitope (Glu-Gln-
- GCN4/CC-Angl/FD consists of a hemagglutinin signal sequence at its amino terminus to allow for secretion (bases 1-48 of SEQ ID NO: 3 ( Figure 3 A), a FLAG tag sequence (bases 49-72 of SEQ ID NO:3 ( Figure 3A)), a short bridging sequence consisting of the amino acids Gly-Ile-Leu of SEQ ID NO:3 ( Figure 3A)), the coding sequence of GCN4 coiled-coil domain (bases 82-174 of SEQ ID NO:3 ( Figure 3A)), another bridging sequence of the amino acids Gly-Ser (bases 175-180 of SEQ ID NO:3 ( Figure 3A)), and the coding sequence for the linker region of Angl (bases 181-249 of SEQ ID NO:3 ( Figure 3A)) followed by fibrinogen domain of Angl (FD
- CMP/CC-Angl/FD consists of a hemagglutinin signal sequence at its amino terminus to allow for secretion (bases 1-48 of SEQ ID NO:5 ( Figure 4A)), a FLAG tag sequence (bases 49-72 of SEQ ID NO:5 ( Figure 4A)), a short bridging sequence consisting of the amino acids Gly-Ile-Leu (bases 73-81 of SEQ ID NO:5 ( Figure 4A)), the coding sequence of MAT coiled-coil domain (bases 82-210 of SEQ ID NO:5 ( Figure 4A)), another bridging sequence consisting of the amino acids Gly-Ser (bases 211-216 of SEQ ID NO:5 ( Figure 4A)), and the coding sequence for the linker region of Angl (bases 217- 285 of SEQ ID NO:5 ( Figure 4A)) followed by fibrin
- COMP/CC-Angl/FD consists of a hemagglutinin signal sequence at its amino terminus to allow for secretion (bases 1-48 of SEQ ID NO:7 ( Figure 5A)), a FLAG tag sequence (bases 49-72 of SEQ ID NO:7 ( Figure 5A)), a short bridging sequence consisting of the ammo acids Gly-Ile-Leu (bases 73-81 of SEQ ID NO:7 ( Figure 5A)), the coding sequence of COMP coiled-coil domain (bases 82-221 of SEQ ID NO:7 ( Figure 5A)), another bridging sequence consisting of amino acids Gly-Ser (bases 222-227 of SEQ ID NO:7 ( Figure 5A)), and the coding sequence for the linker region of Angl (bases 228-296 of SEQ ID NO:7 ( Figure 5A)) followed by fibrinogen domain of
- EXAMPLE 8 CHARACTERIZATION OF CHIMERIC-ANGI PROTEIN - MOLECULAR WEIGHT ANALYSIS
- N-linked glycosylation sites there are five N-linked glycosylation sites in native Angl, while there is one predicted N-linked glycosylation site in each of GCN4-Angl, MAT-Angl and COMP-Angl. These predicted N-linked glycosylation sites could potentially increase the molecular weight by approximately 2500 Da/site.
- the predicted molecular weights for native Angl, GCN4-Angl, MAT-Angl and COMP-Angl under reducing conditions are approximately, 71.3 kDa, 34.5 kDa, 35.8 kDa, and 36.0 kDa, respectively.
- Subsequent SDS PAGE analyses (Figure 8) of COS cell-derived protein described infi-a confirmed these approximate molecular weights.
- MAT-Angl (-130 kDa and -180 kDa) and COMP-Angl (-180 kDa and -220 kDa) exhibited an unexpectedly large molecular weight under non-reducing conditions as compared with the expected molecular weights of recombinant MAT-Angl (-135 kDa) and COMP-Angl (-220 kDa) were shown under the non-reducing condition ( Figure 8).
- anti-FLAG Ml antibody-agarose gel was washed with 0.1 M glycine/HCl (pH 3.5) and equilibrated with IX TBS buffer (50 mM Tris, 150 mM NaCl, pH 7.4). The supernatant containing each recombinant protein was passed through a column filled with anti-FLAG Ml antibody-agarose gel. After triple passage of the supernatant, the column was washed with IX TBS buffer containing 1 mM CaCl 2 . The recombinant protein bound to the Ml gel was eluted with elution buffer containing IX TBS and FLAG peptide (Sigma-Aldrich, Inc.).
- the relatively easy purification of the recombinant proteins provides a distinct advantage over purifying the parent protein, angiopoietin- 1, which requires a highly extensive and labor-intensive purification scheme.
- recombinant proteins were quantitated using conventional Bradford method with DU 800 spectrophotometer (Beckman, Inc.) and confirmed with Coomassie blue staining of SDS-PAGE gel. These analyses showed that 600-700 ⁇ g of each recombinant protein/liter of COS-7 cell supernatant was obtained, which represents moderate level of expression. [00221]
- the recombinant proteins were efficiently secreted from COS-7 cells with more than 98% of the total proteins present in the culture medium.
- COS-7 cell supernatant yielded approximately 1 mg each of purified native Angl, GCN4-Angl, MAT-Angl and COMP-Angl that were used in the studies described infra to further characterize the protein.
- the samples were further separated by 10% SDS-PAGE, and electro-blotted on to nitrocellulose membranes, and Western blotted with anti-FLAG Ml antibody to detect the bound recombinant chimeric-Angl, and further washed and incubated with horseradish peroxidase-conjugated secondary antibody.
- Signal was visualized by chemiluminescent detection accordmg to the manufacturer's protocol (Amersham Pharmacia Biotech) using chemiluminescence scanner (LAS- 1000, Fuji Film, Tokyo). See Figure 9. Approximately 75%, 20%, 95% or 100% of native Angl, GCN4-Angl, MAT-Angl, and COMP-Angl, respectively, bound to sTie2-Fc.
- Fc protein As a control, 600 ng of Fc protein, which had only the Fc domain of human IgGl, was also immobilized on the same chip. The binding affinity was obtained by subtracting the response value using Fc protein from the values obtained using the Tie-2-Fc protein.
- the recombinant proteins including native Angl, GCN4-Angl, MAT-Angl and COMP-Angl were passed over the chip to allow binding between Tie-2 receptor ectodomain and the recombinant proteins. The binding step was followed by a dissociation step that allowed the bound proteins to dissociate from the Tie-2 receptor ectodomain.
- GCN4-Angl was completely dissociated from the immobilized Tie-2 receptor ectodomain within 5 minutes, while MAT-Angl, COMP-Angl, and native Angl was not as easily dissociated, implying that there is a strong interaction between MAT-Angl, COMP-Angl, native Angl and Tie-2 receptor ectodomain.
- various HCI solutions pH 4.0 - 2.0
- IM NaCl high salt
- EXAMPLE 12 - TIE2 PHOSPHORYLATION ASSAY Human umbilical vein endothelial cells (HUVECs) were prepared from human umbilical cords by coUagenase digestion and maintained as previously described (Kim et al., 2000 Circ. Res. 86: 24-29). The primary cultured cells used for the biochemical assays were between passages 2 and 3. Primary cultured HUVECs were incubated with control buffer, and 200 ng of native Angl, and 100 ng of GCN4-Angl, MAT-Angl, or COMP- Angl for 10 min. The cells were harvested in extraction buffer, and 0.5 mg of protein was used for immunoprecipitation.
- Tie2 proteins in the sample were immunoprecipitated with anti-Tie2 antibody and collected. Immunoprecipitated samples were Western blotted with anti-phospho-tyrosine antibody (Figure 12A, upper band), and the membrane was re- blotted with anti-Tie2 antibody ( Figure 12 A, lower band) to verify equal loading of protein in each lane.
- the assay revealed that COMP-Angl -induced Tie2 phosphorylation (-8.8 fold) is much higher than phosphorylation induced by native Angl (-3.6 fold) or MAT-Angl (-4.0 fold). However, GCN4-Angl did not change Tie2 phosphorylation ( Figure 12).
- EXAMPLE 13 - AKT (SER473) PHOSPHORYLATION ASSAY HUVECs were incubated with control buffer, and 200 ng of native Angl, GCN4-Angl, MAT-Angl or COMP-Angl for 15 min. Alternatively, HUVECs were incubated with control buffer and different amounts of COMP-Angl. HUVECs were also mcubated with 200 ng of COMP-Angl for different times. After treatment, cell lysates were harvested. Each lane contained 50 ⁇ g of total protein from the cell lysates. Western blots were probed with anti-phospho-Akt (Ser473) antibody.
- the blot was reprobed with anti-Akt antibody (Figure 13A-13C, lower bands) to verify equal loading of protein in each lane.
- the assay revealed that COMP-Angl -induced Akt (Ser 473) phosphorylation (9.7 fold) is greater than Akt (Ser 473) phosphorylation induced by native Angl (3.7 fold) or MAT-Angl (3.3 fold). .However, GCN4-Angl does not change Akt (Ser 473) phosphorylation. COMP-Angl-induced Akt (Ser 473) phosphorylation occurs in a dose- dependent manner and persists up to 60 min ( Figures 13A-13C, upper bands).
- EXAMPLE 14 - APOPTOSIS ASSAY To induce apoptosis, HUVECs were plated onto gelatinized 24-well plates (7 x 10 4 cells per well) in M-199 containing 20% FBS and incubated for 12 hr. The wells were extensively washed with PBS, and the medium was changed to serum-free M-199 containing control buffer, 200 ng ml of native Angl, GCN4-Angl, MAT-Angl, or COMP-Angl, and incubated for 30 hr. Floating apoptotic cells were collected with 2 washes in PBS. Adherent cells were collected by trypsinization.
- the wounded cells were further mcubated in serum free medium with control buffer or 200 ng/ml of native Angl, GCN4- Angl, MAT-Angl, or COMP-Angl.
- HUVECs were allowed to migrate for 10 hr and were rinsed with PBS, followed by fixing with absolute methanol and staining with Giemsa. Migration was quantitated by counting the number of cells that moved beyond the reference line. All experiments were performed in triplicate. The results were: Native Angl (about 1.86 fold increase of cell migration), GCN4-Angl (about 1.20 fold increase of cell migration), MAT-Angl (about 2.06 fold increase of cell migration) and COMP- Angl (about 2.58 fold increase of cell migration). See Figures 14F-14J. See also Table 2.
- EXAMPLE 16 - TUBE FORMATION ASSAY [00243] Matrigel (Sigma-Aldrich Inc.) was thawed overnight at 4 °C and mixed to homogeneity using cooled pipette tips. Matrigel was added to the 24-well tissue culture plate (250 ⁇ l/well) at 4°C. The 24-well plate was brought to a 37°C cell culture incubator and incubated for 1 hr to allow the Matrigel to solidify.
- HUVECs were trypsinized, counted, resuspended in serum free M-199 medium, and added on Matrigel (lx 10 5 cells/well) in the presence of control buffer, and 200 ng/ml of native Angl, GCN4-Angl, MAT-Angl or COMP-Angl. Cells were incubated for 12 hr to allow capillary-like structure to fo ⁇ n. After 12 hr, the wells were washed with PBS, fixed for 30 min in 0.5% glutaraldehyde, and the length of capillary-like tubes were quantified using Image Pro- Express Software (Cyber Media).
- PPAECs porcine pulmonary artery endothelial cells
- a sucrose aluminum sulfate pellet (0.4 x 0.4 x 0.2 mm; Sigma-Aldrich) was coated with hydron polymer (Sigma-Aldrich) containing one of the following: control buffer (0.05 mol/L Tris-HCl, pH 7.5, 150 mmol/L NaCl, 0.05% Chaps); native Angl (600 ng/pellet); or COMP-Angl (300 ng/pellet).
- the pellet was positioned 0.5 mm from the corneal limbus, and erythromycin ophthalmic ointment was applied to each operated eye.
- mice On postoperative day 6 after pellet implantation, the corneas of all mice were examined by a Coolpix995 digital Camera (Nikon, Japan) attached to a SZ4045TRPT stereomicroscope (Olympus, Japan) and photographed. Vessel length and the arc of corneal circumference occupied by angiogenesis (circumferential angiogenesis, in degrees) were measured. After these measurements were completed, mice received an i.v. injection of 500 ⁇ g of the endothelial cell-specific marker BS-1 lectin conjugated to FITC (Vector Laboratories, Burlingame, California). After 30 minutes, the animals were killed. The eyes were enucleated and fixed in 1% paraformaldehyde.
- corneal angiogenesis was evaluated using a stereomicroscope (Fig. 16A). Consistent with a previous report (Asahara, T. et al. 1998, Circ. Res. 83:233-240), the pellet containing control buffer or native Angl alone did not induce significant angiogenesis. However, the pellet containing COMP-Angl induced corneal angiogenesis extending from the limbus across the cornea (0.96 ⁇ 0.22 mm in length) (Fig. 16A-16D).
- COMP-Angl shows a potent angiogenic effect in vivo.
- Histological analysis of corneal sections showing the anterior portions of the limbal artery confirmed that angiogenesis was active in COMP- Angl -treated corneas compared to control- and native Angl -treated corneas (Fig. 16B, right panels).
- EXAMPLE 19 Acute injection of COMP-Angl induces Tie2 phosphorylation in lung.
- EXAMPLE 20 - COMP-Angl protects against radiation-induced apoptosis and death.
- Damage to the gastrointestinal (GI) tract limits the use of radiation in cancer treatment.
- Microvascular endothelial apoptosis in the intestinal villi is the primary lesion caused by high doses of radiation (Paris, F. et al. 2001, Science 293:293-297). Therefore, we examined the effect of intravenous (i.v.) treatment with COMP-Angl on microvascular endothelial survival in a murine whole-body irradiation model.
- Paraffin tissue blocks in corneas were sectioned at 5 ⁇ m and stained with hematoxylin and eosin. Paraffin tissue blocks in irradiated tissues were sectioned 8 ⁇ m thick and were co-stained with PEC AM- 1 and TUNEL method (Intergen, Norcross, Georgia) to detect endothelial apoptotic cells.
- the microcapillary endothelial cells and apoptotic cells in the small intestinal villi and lung endothelium were viewed, counted, and photographed with an Axioskope2 plus microscope (Carl Zeiss, Germany) equipped with color CCD camera (ProgResC14, Jenoptik, Germany) and monitor. Two independent, blinded investigators counted apoptotic endothelial cells in approximately 1,000 villi from 5 different animals (approximately 200 villi per mouse) for each group. Inter-investigator variation was ⁇ 5%.
- TUNEL Terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling
- COMP-Angl provides strong protection against i ⁇ adiation damage specifically to endothelial cells. Accordingly, the actual survival of 15 Gy- irradiated mice increased from a mean of 144 ⁇ 7 hrs (median 144 hrs) in control mice to 190 ⁇ 8 hrs (median 192 hrs) in mice treated with i.v. COMP-Angl (Fig. 181).
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DK03760110T DK1549679T3 (en) | 2002-05-21 | 2003-05-21 | Fusion protein comprising angiopoietin receptor binding and a multimerization domain |
EP03760110A EP1549679B1 (en) | 2002-05-21 | 2003-05-21 | Fusion protein comprising angiopoietin receptor-binding and a multimerization domain |
CA2486649A CA2486649C (en) | 2002-05-21 | 2003-05-21 | Fusion protein comprising angiopoietin receptor-binding and a multimerization domain |
AT03760110T ATE437893T1 (en) | 2002-05-21 | 2003-05-21 | FUSION PROTEIN WITH ANGIOPOIETIN RECEPTOR BINDING AND A MULTIMERIZATION DOMAIN |
JP2004513331A JP4384597B2 (en) | 2002-05-21 | 2003-05-21 | Chimeric coiled-coil molecule |
DE60328615T DE60328615D1 (en) | 2002-05-21 | 2003-05-21 | FUSION PROTEIN WITH ANGIOPOIETIN RECEPTOR BINDING AND A MULTIMARIZATION DOMAIN |
AU2003256001A AU2003256001A1 (en) | 2002-05-21 | 2003-05-21 | Fusion protein comprising angiopoietin receptor-binding and a multimerization domain |
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US20060074230A1 (en) | 2006-04-06 |
ATE437893T1 (en) | 2009-08-15 |
US7691366B2 (en) | 2010-04-06 |
US7081443B2 (en) | 2006-07-25 |
KR20050004198A (en) | 2005-01-12 |
US20080160574A1 (en) | 2008-07-03 |
DE60328615D1 (en) | 2009-09-10 |
US20030220476A1 (en) | 2003-11-27 |
US7309586B2 (en) | 2007-12-18 |
EP1549679A4 (en) | 2006-06-21 |
EP1549679A1 (en) | 2005-07-06 |
EP1549679B1 (en) | 2009-07-29 |
CA2486649C (en) | 2014-08-05 |
DK1549679T3 (en) | 2009-10-26 |
AU2003256001A1 (en) | 2003-12-31 |
CA2486649A1 (en) | 2003-12-24 |
JP2006504405A (en) | 2006-02-09 |
JP4384597B2 (en) | 2009-12-16 |
KR100611620B1 (en) | 2006-09-01 |
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