WO2005037235A2 - Fibroblast growth factor receptor-1 inhibitors and methods of treatment thereof - Google Patents
Fibroblast growth factor receptor-1 inhibitors and methods of treatment thereof Download PDFInfo
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Definitions
- the present invention relates to an antibody, or fragment thereof, that is specific for fibroblast growth factor receptor (FGFR)- 1 (nib), FGFR-l(lIIc), and/or FGFR- 4(IIIc).
- FGFR fibroblast growth factor receptor
- the present invention further provides methods of antagonizing and neutralizing FGFR-1 and/or FGFR-4 as a treatment for obesity, diabetes, and/or a condition related thereto, including reducing food intake or total body mass.
- Fibroblast growth factor (FGF) pathways in general are implicated in many physiological processes, such as morphogenesis during development and angiogensis which is the process of developing new blood vessels that involves the proliferation, migration, and tissue infiltration of capillary endothelial cells from pre-existing blood vessels.
- FGFs are some of the factors that have been implicated as possible regulators of angiogenesis along with transforming growth factor (TGF), vascular endothelial growth factor (VEGF), and platelet deried growth factor (PDGF).
- FGF pathways are also implicated in neuronal survival and wound healing. They are also thought to be important in a number of pathological processes.
- FGFR-1 has been implied to be involved in diseases such as cancers and arthritis.
- FGF pathways in metabolism, such as feeding behavior and adipose tissue development
- these findings entail fundamental mechanisms through which metabolism is regulated.
- a recent study performed in mice has shown that injections of FGF-2, in combination with basement membrane proteins, can induce development of new adipose tissue at the site of the injection.
- FGFs may act in a paracrine manner to affect adipogenesis and thereby influence the regional distribution of adipose tissue in the body and the relationship between adipose tissue and insulin resistance is well-established, both of which are strongly implicated in type 2 diabetes and cardiovascular disease.
- Fibroblast growth factor receptors have common structural features and consist of an extracellular ligand-binding domain containing 2 or 3 Ig-like loops and a unique acid region, a trans-membrane domain, and the cytoplasmic region, which contains the tyrosine kinase catalytic domain and kinase insert.
- the FGFRs belong to Subclass IV of the receptor tyrosine kinase family of proteins. These receptors bind in an overlapping pattern to FGFs. It has been established that 22 FGFs act on 5 FGFRs in FGF ligand paracrine interaction.
- FGFR-1 has two alternative splicing forms that differ from each other by the amino acid substitutions in the third IgG-like domain of the extracellular structure of the receptor designated Illb and IIIc, FGFR-4 has only one. These substitutions constitute what is believed to be part of the binding domain of the receptor, and therefore are most likely to cause the two splicing forms to have distinct ligand specificities. The two forms have also been shown to be differentially expressed, which may be part of an extraordinar control mechanism of complex functions mediated by FGFR-1.
- Ligand binding which is strengthened by the presence of heparin sulfate, causes the FGFRs to dimerize and activate specific intracellular signaling pathways (Bellot et al. 1991).
- the receptor becomes auto-phosphorylated and thus capable of activating downstream cellular pathways.
- stimulation of proliferation or induction of differentiation is most commonly observed for FGFR-1 mediated signaling.
- the present invention also provides a method of treating obesity (or an obesity related condition), diabetes (or a diabetes related condition) and/or a method to reduce food intake by administering to a mammal in need thereof a therapeutically effective amount of an FGFR-1 and/or FGFR-4 antagonist.
- Figure 1 shows the amino acid and nucleic acid sequences of the Variable Regions and CDRs of FR1-H7.
- Figure 1A shows the amino acid and DNA sequences of the Variable Region of the Heavy Chain of FR1-H7 (SEQ ID NOS:7 and 31).
- Figure IB shows the amino acid and DNA sequences of the Variable Region of the Light Chain of FR1-H7 (SEQ ID NOS:8 and 32).
- Figure 1C shows the nucleic acid sequences of the CDRs of the variable region of the heavy chain and the variable region of the light chain of FR1-H7 (SEQ ID NOS:25-30).
- Figure ID shows the amino acid sequences of the CDRs of the variable region of the heavy chain and the variable region of the light chain of FR1-H7 (SEQ ID NOS:l-6).
- Figure 2 shows the amino acid and nucleic acid sequences of the Variable
- Figure 2 A shows the amino acid and DNA sequences of the Variable Region of the Heavy Chain of FRl-Al (SEQ ID NOS:15 and 39).
- Figure 2B shows the amino acid and DNA sequences of the Variable Region of the Light Chain of FRl-Al (SEQ ID NOS:16 and 40).
- Figure 1C shows the nucleic acid sequences of the CDRs of the variable region of the heavy chain and the variable region of the light chain of FRl-Al (SEQ ID NOS:33-38).
- Figure ID shows the amino acid sequences of the CDRs of the variable region of the heavy chain and the variable region of the light chain of FRl-Al (SEQ ID NOS.9-14).
- Figure 3 shows binding of FR1-H7 antibody to FGFRs as determined using the
- Figure 4 shows binding of recombinant FGFR-1 to FGF ligand as determined using the ELISA blocking assay.
- Figure 4A shows binding to immobilized FGF-1 and
- Figure 4B shows binding to immobilized FGF-2.
- Each data point is an average of duplicates and error bars are standard deviation.
- Figure 5 shows binding of 125 I-FGF-2 to cell surface FGFR-1.
- Figure 5A the binding of 125 I-FGF-2 to the cells had two distinct components: non-specific and specific bindings.
- Figure 5B I-FGF-2 binding to the cells was inhibited by the presence of FR1-H7 antibody. Each data point is an average of triplicates. Error bars are standard deviations.
- Figure 6 shows a Western blot of FGFR-1 phosphorylation.
- the upper blot was probed with anti-phospho-Tyrosine antibody and the lower blot shows control protein bands in the cell lysates for estimation of relative gel loading.
- Figure 7 shows proliferation of Human Umbilical Vascular Endothelial Cells
- Figure 8 shows proliferation of adipocytes in vitro.
- Figure 8 A shows the effects of FGF-2 on adipocyte proliferation and
- Figure 8B shows the effects of FR1-H7 on
- FGF-2-stimulated adipocyte proliferation Each data point is an average of triplicates.
- Figure 10 shows the effect of FR1-H7 on food intake in nu/nu female mice.
- Figure 11 shows the effect of FR1-H7 on rearing behavior in a novel environment (Mean +/- SEM).
- Figure 12 shows the effect of FR1-H7 on blood glucose.
- Figure 12A shows the effect of FR1-H7 on non-fasted blood glucose (Mean +/- SEM).
- Figure 12B shows the effect of FR1-H7 on non-fasted blood glucose after weights are fully recovered (Mean +/-
- Figure 14 shows the effects on tissue weights after a single does of FR1-H7 treatment. Each bar represents the value calculated as lOOx the ratio of tissue weight over total body weight. Error bars are standard deviation.
- Figure 15 shows the effects on serum chemistry after a single dosing of FR1-
- FIG 15B serum triglycerides levels (mean +/- SEM) are determined; in Figure 15C, serum insulin levels are determined; and in Figure 15D, serum leptin levels are determined. All individual measurements are shown. Data taken at the same time points were separated according to treatment groups for viewing purpose.
- Figure 16 shows the effect of FR1-H7 on body weight in C57 black mice
- Figure 17 shows the effect of FR1-H7 on body weight in db/db mice (Mean +/-
- Figure 18 shows the effects of FR1-H7 on food intakes in db/db mice (Mean
- Figure 19 shows the effects of FR1-H7 on the sizes of adipose tissue (Mean +/-
- Figure 20 shows the binding of FRl-Al antibody to FGFRs as determined using the ELISA binding assay.
- Figure 21 shows binding of recombinant FGFR-1 to FGF ligand as determined using the ELISA blocking assay.
- Figure 22 shows a Western blot of FGFR-1 phosphorylation.
- Figure 23 shows mitogenesis of Gl 8 cells in vitro in presence of antibodies.
- Each data point is an average of triplicates. Error bars are standard deviations.
- Figure 24 shows the effect of FRl-Al on body weights in nu/nu female mice
- Figure 25 shows the effect of FRl-Al on food intakes in nu/nu female mice.
- Figure 26 shows treatment of C57 black mice with FR1 -H7, which caused decreases in body weights, food intake, muscle and fat mass, energy expenditure, ambulatory activities and Respiratory Exchange Ratio (RER) as compared to the control.
- Figure 26A shows decrease in daily body weight with FR1-H7 treatment as compared to control.
- Figure 26B shows decrease in daily food intake with FR1-H7 treatment as compared to control.
- Figure 26C shows decrease in fat and muscle weights with FR1-H7 treatment as compared to control.
- Figure 26D shows decrease in energy expenditure and ambulatory activities with FR1-H7 treatment as compared to control.
- Figure 26E shows decrease in oxygen consumption and RER with FR1-H7 treatment as compared to control.
- Figure 27 shows a paired-feeding of FR1-H7 and control treated animals resulting in identical decreases in body weights, muscle and fat mass, and energy expenditure between the two groups. Both groups also exhibited similar decreases in ambulatory activities and RER.
- Figure 27A shows decrease in daily body weight of both FR1-H7 treated and control animals.
- Figure 27B shows a decrease in fat and muscle weights of both FR1-H7 treated and control animals.
- Figure 27C shows a decrease in energy expenditure and ambulatory activities of both FR1-H7 treated and control animals.
- Figure 27D shows decrease in oxygen consumption of both FR-1-H7 treated and control animals.
- Figure 28 shows the amino acid and nucleic acid sequences of the Variable
- Figure 28A shows the amino acid and nucleic acid sequences of the Variable Region of the Heavy Chain of FR1-4H and the Variable Region of the Light Chain of FR1-4H (SEQ ID NOS:23-24 and 47-48).
- Figure 28B shows the amino acid and nucleic acid sequences of the CDRs of the Variable Region of the Heavy and Light Chains of FR1-4H (SEQ LD NOS:17-22 and 41-46).
- Figure 29 shows that FR1 -4H inhibited the binding of FGFR- 1 (nib) to FGF ligand. Percent binding was determined using the ELISA blocking assay. Each data point is an average of duplicates. Error bars are standard deviations.
- Figure 30 shows examples of FGFR small molecule inhibitors including indolinone derivatives, quinolinone derivatives and pyrimido-pyridine derivatives.
- Figure 31 shows that FGFR small molecule inhibitors inhibited the auto- phosphorylation of FGFR-1 (IIIc) in a cell-based phosphorylation assay. Equal amounts of cell lysate were applied to each sample lane. Receptor auto-phosphorylation was probed using anti-phospho-tyrosine antibody as described in Example 20.
- the present invention provides purified antibodies, or fragments thereof, specific for fibroblast growth factor receptor (FGFR)-l( ⁇ ib), FGFR-l(HIc), or FGFR- 4(IIIc).
- An example of an antibody that is specific for FGFR-l(HIb) and/or FGFR-l(IHc), and/or FGFR-4(IIIc) is FR1-H7 (Fig. 1). It should be appreciated that the description herein with respect to FR1-H7 applies to all antibodies specific for FGFR-l(DIb) and/or FGFR-l(HIc).
- FRl-Al is an example of an antibody specific for FGFR-l(DIc) and/or FGFR-4(IIIc) (Fig. 2).
- FR1-H7 any description herein with respect to FRl- Al applies to all antibodies specific for FGFR-1 (fflc) and/or FGFR-4( ⁇ ic).
- FR1-4H is an example of an antibody of the invention specific for at least FGFR(HIb) (Fig. 28).
- the antibodies, or fragments thereof, of the present invention bind to an extracellular domain of FGFR-1 (Illb), FGFR-l( ⁇ ic), or FGFR-4(HIc) and neutralize activation of the receptor. More preferably, the antibodies, or fragments thereof, of the present invention inhibit binding of a ligand of FGFR-1 (Hlb), FGFR-1 (IIIc), or FGFR- 4(IIIc) to its receptor.
- Naturally occuring antibodies typically have two identical heavy chains and two identical light chains, with each light chain covalently linked to a heavy chain by an interchain disulfide bond and multiple disulfide bonds further link the two heavy chains to one another.
- Individual chains can fold into domains having similar sizes (110-125 amino acids) and structures, but different functions.
- the light chain can comprise one variable domain (V ) and/or one constant domain (C ).
- the heavy chain can also comprise one variable domain (V H ) and/or, depending on the class or isotype of antibody, three or four constant domains (C H C H 2, C H 3 and C H 4).
- the isotypes are IgA, IgD, IgE, IgG, and IgM, with IgA and IgG further subdivided into subclasses or subtypes (IgA 1-2 and IgG ⁇ -4).
- variable domains show considerable amino acid sequence variability from one antibody to the next, particularly at the location of the antigen-binding site.
- Single chain Fv is an antibody fragment containing a V L domain and a V H domain on one polypeptide chain, wherein the N terminus of one domain and the C terminus of the other domain are joined by a flexible linker (see, e.g., U.S. Pat. No. 4,946,778 (Ladner et al.); WO 88/09344, (Huston et al.).
- WO 92/01047 (McCafferty et al.) describes the display of scFv fragments on the surface of soluble recombinant genetic display packages, such as bacteriophage.
- the peptide linkers used to produce the single chain antibodies can be flexible peptides selected to assure that the proper three-dimensional folding of the V L and V H domains occurs.
- the linker is generally 10 to 50 amino acid residues.
- the linker is 10 to 30 amino acid residues. More preferably the linker is 12 to 30 amino acid residues. Most preferably is a linker of 15 to 25 amino acid residues.
- An example of such linker peptides includes repeats of four Glycines followed by Serine.
- Single chain antibodies lack some or all of the constant domains of the whole antibodies from which they are derived. Therefore, they can overcome some of the problems associated with the use of whole antibodies. For example, single-chain antibodies tend to be free of certain undesired interactions between heavy-chain constant regions and other biological molecules. Additionally, single-chain antibodies are considerably smaller than whole antibodies and can have greater permeability than whole antibodies, allowing single-chain antibodies to localize and bind to target antigen-binding sites more efficiently. Furthermore, the relatively small size of single-chain antibodies makes them less likely to provoke an unwanted immune response in a recipient than whole antibodies.
- Multiple single chain antibodies each single chain having one V H and one V L domain covalently linked by a first peptide linker, can be covalently linked by at least one or more peptide linker to form multivalent single chain antibodies, which can be monospecific or multispecific.
- Each chain of a multivalent single chain antibody includes a variable light chain fragment and a variable heavy chain fragment, and is linked by a peptide linker to at least one other chain.
- the peptide linker is composed of at least fifteen amino acid residues. The maximum number of amino acid residues is about one hundred.
- Two single chain antibodies can be combined to form a diabody, also known as a bivalent dimer.
- Diabodies have two chains and two binding sites, and can be monospecific or bispecific.
- Each chain of the diabody includes a V H domain connected to a V L domain.
- the domains are connected with linkers that are short enough to prevent pairing between domains on the same chain, thus driving the pairing between complementary domains on different chains to recreate the two antigen-binding sites.
- Triabodies are constructed with the amino acid terminus of a V L or V H domain directly fused to the carboxyl terminus of a V L or V H domain, i.e., without any linker sequence.
- the triabody has three Fv heads with the polypeptides arranged in a cyclic, head-to-tail fashion. A possible conformation of the triabody is planar with the three binding sites located in a plane at an angle of 120 degrees from one another.
- Triabodies can be monospecific, bispecific or trispecific.
- Fab Fram, antigen binding refers to the fragments of the antibody consisting of V L C L V H CH I domains.
- F(ab') 2 fragments with the interchain disulfide bonds intact are referred to as F(ab') 2 , while a single Fab' results when the disulfide bonds are not retained. F(ab') 2 fragments have higher avidity for antigen than the monovalent Fab fragments.
- Fc Frametic crystallization
- IgG antibody for example, the Fc comprises C H2 and C H3 domains.
- the Fc of an IgA or an IgM antibody further comprises a C H4 domain.
- the Fc is associated with Fc receptor binding, activation of complement-mediated cytotoxicity and antibody-dependent cellular-cytoxicity (ADCC).
- ADCC antibody-dependent cellular-cytoxicity
- the hinge region separates the Fab and Fc portions of the antibody, providing for mobility of Fabs relative to each other and relative to Fc, as well as including multiple disulfide bonds for covalent linkage of the two heavy chains.
- antibodies of the invention include, but are not limited to, naturally occurring antibodies, bivalent fragments such as (Fab') 2 , monovalent fragments such as Fab, single chain antibodies, single chain Fv (scFv), single domain antibodies, multivalent single chain antibodies, diabodies, triabodies, and the like that bind specifically with antigens.
- Antibody fragments also include polypeptides with amino acid sequences substantially similar to the amino acid sequence of the variable or hypervariable regions of the antibodies of the invention.
- Substantially the same amino acid sequence is defined herein as a sequence with at least 70%, preferably at least about 80%, and more preferably at least about 90% homology to a compared amino acid sequence, as determined by the FASTA search method in accordance with Pearson and Lipman, Proc. Natl. Acad. Sci. USA 85, 2444-2448 (1988) and which binds to FGFR-1 and/or FGFR-2.
- Antibody specificity refers to selective recognition of the antibody for a particular epitope of an antigen.
- Antibodies, or fragments thereof, of the present invention can be monospecific or bispecific.
- Bispecific antibodies are antibodies that have two different antigen- binding specificities or sites. Where an antibody has more than one specificity, the recognized epitopes can be associated with a single antigen or with more than one antigen.
- the present invention provides bispecific antibodies, or fragments thereof, that bind to two different antigens, with at least one specificity for FGFR-l(IIIb), FGFR-1 (Die), and/or FGFR-4(IIIc).
- Specificity of the present antibodies, or fragments thereof, for FGFR can be determined based on affinity and/or avidity.
- Affinity represented by the equilibrium constant for the dissociation of an antigen with an antibody (Kj) measures the binding strength between an antigenic determinant and an antibody-binding site.
- Avidity is the measure of the strength of binding between an antibody with its antigen. Avidity is related to both the affinity between an epitope with its antigen binding site on the antibody, and the valence of the antibody, which refers to the number of antigen binding sites of a particular epitope.
- Antibodies typically bind with a dissociation constant (K ) of 10 "5 to 10 "11 liters/mol (e.g., K D ⁇ 100 nM). Any K ⁇ less than 10 "4 liters/mol is generally considered to indicate nonspecific binding. The lesser the value of the I , the stronger the binding strength between an antigenic determinant and the antibody binding site.
- the present invention provides a purified antibody, or fragment thereof, specific for FGFR-l(IIIb) and/or FGFR-1 (Die), and/or FGFR-4(HTc), wherein the antibody binds to an extracellular domain of an FGFRl-(IIIb) and/or FGFRl-(HIc) and/or FGFR-4(IIIc) and neutralizes activation of the receptor.
- the present invention also provides a purified antibody or fragment thereof, specific for FGFR-1 (Hie) and/or FGFR- 4(IIIc) (FRl-Al), wherein the antibody binds to an extracellular domain of an FGFR- l(IHc) and/or FGFR-4(IIIc) and neutralizes activation of the receptor.
- the present invention also provides a purified antibody or fragment thereof, specific for at least FGFR- l(IHb) (FR1-4H), wherein the antibody binds to an extracellular domain of at least an FGFR-l(IIIb) and neutralizes activation of the receptor.
- neutralizing a receptor means inactivating the intrinsic kinase activity of the receptor to transduce a signal.
- a reliable assay for FGFR-1 or FGFR-4 neutralization is the inhibition of receptor phosphorylation.
- the present invention is not limited by any particular mechanism of FGFR neutralization. Some possible mechanisms include preventing binding of the FGF ligand to the extracellular binding domain of the FGF receptor, inducing the internalization of the receptors, and preventing dimerization or oligomerization of receptors.
- Neutralization of FGF activation of an FGFR-1 or FGFR-4 can be determined by any suitable method.
- neutralization of FGF activation of an FGFR in a sample of endothelial or non-endothelial cells, such as in adipose tissue or tumor cells may be performed in vitro or in vivo.
- Such neutralizing in a sample of FGFR-1 or FGFR- 4 expressing cells involves contacting the cells with an antibody of the invention. In vitro, the cells are contacted with the antibody before, simultaneously with, or after, adding FGF to the cell sample.
- the invention provides the antibody of the invention inhibits binding of a ligand of FGFRl-(IIIb) and/or FGFRl-(IIIc) or FGFRl-(HIc) and/or FGFR4 to its receptor.
- the antibody may be of an alternative splicing form containing the ligand binding function.
- Some examples of the ligands of FGFRl-(DIb) include the protein fibroblast growth factor (FGF) -1, -2, -3 and -10.
- FGF protein fibroblast growth factor
- FGFRl-(IIIc) include FGF -1,-2, -4,-5, and -6.
- Some examples of the ligands of FGFR4- include FGF-1, -2, -4, -6, -8b, -8e, -8f, -9, -16, -17b, and -19. (See Endocrine- Related Cancer (2000) 7 165-197 at 165-169, "Fibroblast growth factors, their receptors and signaling" C. J. Powers, S. W. McLeskey and A. Wellstein).
- one, two, three, four, five, or all six complementarity-determining regions (CDR) of the present antibodies have sequences selected from the group consisting of SEQ ID NO:l, SEQ ID NO:2, SEQ ID NO:3, SEQ ED NO:4, SEQ ID NO:5, and SEQ ID NO:6 (i.e., any one of the CDRs of FR1-H7).
- one, two, three, four, five, or all six complementarity- determining regions (CDR) of the present antibodies have sequences selected from the group consisting of SEQ ID NO:9, SEQ ID NO:10, SEQ ID NO:ll, SEQ ID NO:12, SEQ ID NO:13, and SEQ ID NO:14 (i.e., any one of the CDRs of FRl-Al).
- one, two, three, four, five, or all six complementarity-determining regions (CDR) of the present antibodies have sequences selected from the group consisting of SEQ ID NO: 17, SEQ ID NO: 18, SEQ H) NO: 19, SEQ ID NO:20, SEQ ID NO:21, and SEQ ID NO:22 (i.e., any one of the CDRs of FR1-4H).
- the antibodies of the present invention in another prefened embodiment, have a heavy chain variable region sequence of SEQ ID NO:7 (i.e., the heavy chain variable region of FR1-H7) and/or a light chain variable region sequence of SEQ ID NO:8 (i.e., the light chain variable region of FR1-H7).
- the antibodies of the present invention preferably have a heavy chain variable region sequence of SEQ ID NO:15 (i.e., the heavy chain variable region of FRl-Al) or a light chain variable region sequence of SEQ ID NO:16 (i.e., the light chain variable region of FRl-Al).
- the antibodies of the present invention preferably have a heavy chain variable region sequence of SEQ ID NO:23 (i.e., the heavy chain variable region of FR1-4H) or a light chain variable region sequence of SEQ ID NO:24 (i.e., the light chain variable region of FR1- 4H).
- nucleic acid and amino acid sequences of the CDRs and variable heavy and light chains of the antibodies are described in sequences listed in SEQ ID NO:l to 48.
- the invention provides an isolated nucleic acid encoding the antibody of the invention, antibody equivalents or fragments thereof (SEQ LD NO:25-48).
- the nucleic acids that encode for the heavy and light chains of the antibodies of the invention or their equivalents are obtained by standard molecular biology techniques.
- Nucleic acid molecules of the invention include those that bind under stringent conditions to SEQ ID NOS:25-48 and which encode functionally equivalent polypeptide antibody subunits capable of binding to FGFR-l(IIIb), FGFR-(IIIc) and/or FGFR-4(HIc).
- Stringent conditions denotes conditions for hybridization such as, hybridization to filter-bound DNA in 0.5M NaHPO 4 , 7% sodium dodecyl sulfate (SDS), lmM EDTA at 65°C, and washing in O.lxSSC/0.1% SDS at 68°C (Ausubel F.M. et al., eds., 1989, Cunent Protocols in Molecular Biology, Vol. I, Green Publishing Associates, Inc., and John Wiley & sons, Inc., New York, at p. 2.20.3) or for moderately stringent conditions, washing in 0.2SSC/0.1% SDS at 42°C (Ausubel et al., 1989 supra).
- the monoclonal antibodies of the invention e.g., FR1-H7, FRl-Al and FR1-
- 4H may be produced by methods known in the art. These methods include immuno logical methods described by Kohleer and Milstein in Nature 256, 495-497 (1975) and Campbell in “Monoclonal Antibody Technology, The Production and Characterization of Rodent and Human Hybridomas” in Burdon et al., Eds., Laboratory Techniques in Biochemistry and Molecular Biology, Volume 13, Elsevier Science Publishers, Amsterdam (1985); as well as by the recombinant DNA method described by Huse et al. in Science 246, 1275-1281 (1989).
- the antibodies of the invention may be prepared by immunizing a mammal with a soluble FGFR-l(IHb), FGFR-l(IIIc), or FGFR-4(fiIc).
- the soluble receptors may be used by themselves as immunogens, or attached to a carrier protein or other objects, such as beads, i.e. sepharose beads.
- a mixture of antibody producing cells such as splenocytes, are isolated.
- Monoclonal antibodies may be produced by isolating individual antibody-producing cells from the mixture and immortalizing them by, for example, fusing them with tumor cells, such as myeloma cells. The resulting hybridomas are preserved in culture, and express monoclonal antibodies, which are harvested from the culture medium.
- the antibodies may also be prepared from FGFR- 1 (Dlb), FGFR- 1 (IIIc), or
- the cell to which these receptors may be bound may be a cell known to preferentially express individual receptors, for example, the human FGFR-l(IJIb) is expressed on cells such as fibroblast cells, endothelial cells, certain epithelial cells, flg-1, cek-1, vascular smooth muscle cells, lymphocytes, the human FGFR-1 (Die) is expressed on cells such as macrophage cells, hematopoietic progenitor cells, and numerous tumor cells, and the human FGFR-4(IIIc) is expressed on cells such as embryonic and multipotential stem cells.
- the human FGFR-l(IJIb) is expressed on cells such as fibroblast cells, endothelial cells, certain epithelial cells, flg-1, cek-1, vascular smooth muscle cells,
- the cell to which the receptor is bound may be a cell into which the DNA encoding the FGFR-l(IIIb), FGFR-l(DIc), or FGFR-4(DIc) has been transfected.
- the FGFR-l(IIIb), FGFR-l(IIIc), or FGFR-4(IIIc) may be used as an immunogen to raise an antibody of the invention.
- the receptor peptide may be obtained from natural sources, such as from cells that express the above receptors. Also, a synthetic receptor peptide may be obtained using commercially available machines and the conesponding amino acid sequence.
- FGFR-l(JHb), FGFR- l(IIIc), or FGFR-4(IHc) such as a cDNA or a fragment thereof, may be cloned and expressed and the resulting polypeptide recovered and used as an immunogen to raise an antibody of the invention.
- nucleic acid molecules that encode the FGFR-1 (Dlb), FGFR-1 (Die), or FGFR-4(IIIc), or portions thereof, especially the extracellular portions thereof may be inserted into known vectors for expression in host cells using standard recombinant DNA techniques. Suitable sources of such nucleic acid molecules include cells that express FGFR-l(IIIb), FGFR-l(IIIc), or FGFR-4(IIIc).
- the present invention also provides an expression vector containing a nucleic acid encoding an antibody, or fragment thereof, of the present invention operably linked to a control sequence, as well as a host cell containing such an expression vector. These host cells can be cultured under specific conditions permitting expression of antibodies, or fragments thereof, of the present invention and the antibodies then can be purified from the host cells.
- vectors for expressing proteins in bacteria are known.
- Such vectors include the PATH vectors described by Dieckmann and Tzagoloff in J. Biol. Chem. 260, 1513-1520 (1985). These vectors contain DNA sequences that encode anthranilate synthetase (Trp ⁇ ) followed by a polylinker at the carboxy terminus.
- Suitable vectors for expression in mammalian cells are also known.
- Such vectors include well-known derivatives of SV-40, adenovirus, retrovirus-derived DNA sequences and shuttle vectors derived from combination of functional mammalian vectors, such as those described above, and functional plasmids and phage DNA.
- the expression vectors useful in the present invention contain at least one expression control sequence that is operatively linked to the DNA sequence or fragment to be expressed.
- the control sequence is inserted in the vector in order to control and to regulate the expression of the cloned DNA sequence.
- Examples of useful expression control sequences are the lac system, the trp system, the tac system, the trc system, major operator and promoter regions of phage lambda, the control region of fd coat protein, the glycolytic promoters of yeast, e.g., the promoter for 3-phosphoglycerate kinase, the promoters of yeast acid phosphatase, e.g., Pho5, the promoters of the yeast alphamating factors, and promoters derived from polyoma, adenovirus, retrovirus, and simian virus, e.g., the early and late promoters or SV40, and other sequences known to control the expression of genes of prokaryotic or eukaryotic cells and their viruses or combination thereof.
- yeast glycolytic promoters of yeast
- yeast acid phosphatase e.g., Pho5
- promoters of the yeast alphamating factors e.g., the promoters of the yeast alphamating
- Vectors containing the control signals and DNA to be expressed are inserted into a host cell for expression.
- Some useful expression host cells include well-known prokaryotic and eukaryotic cells.
- Some suitable prokaryotic hosts include, for example, E. coli, such as E. coli SG-936, E. coli HB 101, E. coli W3110, E. coli X1776, E. coli X2282, E. coli DHI, and E.
- coli MRC1 Pseudomonas, Bacillus, such as Bacillus subtilis, and Streptomyces.
- Suitable eukaryotic cells include yeast and other fungi, insect, animal cells, such as COS cells and CHO cells, human cells and plant cells in tissue culture.
- a method of producing an antibody comprising culturing the host cell comprising the vector comprising the nucleic acid sequence encoding for the antibodies of the invention under conditions permitting expression of the antibody.
- the polypeptide or peptide to be expressed such as that encoding the antibodies of the invention, antibody equivalents thereof, or FGFR-1 (Dlb), FGFR-1 (Die), or FGFR-4(fflc) may be isolated from the medium, and purified by methods known in the art. If the polypeptide or peptide is not secreted into the culture medium, the host cells are lysed prior to isolation and purification.
- This invention further provides a pharmaceutical composition
- a pharmaceutical composition comprising the antibody of this invention or fragment thereof and a pharmaceutically acceptable carrier.
- Carrier as used herein includes pharmaceutically acceptable carriers, excipients, or stabilizers which are nontoxic to the cell or mammal being exposed thereto at the dosages and concentrations employed. Often the physiologically acceptable carrier is an aqueous pH buffered solution.
- physiologically acceptable carriers include 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 polyvinylpyrrolidone; amino acids such as glycine, glutamine, asparagine, arginine or lysine; monosaccharides, disaccharides, and othe 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
- low molecular weight less than about 10 residues polypeptide
- proteins such as serum albumin, gelatin
- the active ingredients may also be entrapped in microcapsules prepared, for example, by interfacial polymerization, for example, hydroxymethylcellulose or gelatin- microcapsules and poly(methylmethacylate) microcapsules, respectively, in colloidal drug delivery systems (for example, liposomes, albumin microspheres, microemulsions, nano- particles, and nanocapsules) or in macroemulsions.
- colloidal drug delivery systems for example, liposomes, albumin microspheres, microemulsions, nano- particles, and nanocapsules
- macroemulsions for example, liposomes, albumin microspheres, microemulsions, nano- particles, and nanocapsules
- the formulations to be used for in vivo administration must be sterile. This is readily accomplished by filtration through sterile filtration membranes. Sustained-release preparations may be prepared.
- sustained-release preparations include semipermeable matrices of solid hydrophobic polymers containing the antibody, which matrices are in the form of shaped articles, e.g., films, or microcapsules.
- sustained-release matrices include polyesters, hydrogels (for example, poly(2-hydroxyethyl-methacrylate), or poly(vinylalcohol)), polylactides (U.S. Pat. No. 3,773,919), copolymers of L-glutamic acid and .gamma.
- ethyl-L-glutamate non-degradable ethylene- vinyl acetate
- degradable lactic acid-gly colic acid copolymers such as the LUPRON DEPOT® (injectable microspheres composed of lactic acid-glycolic acid copolymer and leuprolide acetate)
- poly-D-(-)-3- hydroxybutyric acid While polymers such as ethylene- vinyl acetate and lactic acid- glycolic acid enable release of molecules for over 100 days, certain hydrogels release proteins for shorter time periods.
- encapsulated antibodies When encapsulated antibodies remain in the body for a long time, they may denature or aggregate as a result of exposure to moisture at 37 °C, resulting in a loss of biological activity and possible changes in immunogenicity. Rational strategies can be devised for stabilization depending on the mechanism involved. For example, if the aggregation mechanism is discovered to be intermolecular S — S bond formation through thio-disulfide interchange, stabilization maybe achieved by modifying sulffiydryl residues, lyophilizing from acidic solutions, controlling moisture content, using appropriate additives, and developing specific polymer matrix compositions.
- a method of identifying FR1 -H7, FR1 -Al or FR1 -4H or fragments thereof can involve providing a library of antibody fragments, screening the library for an antibody that is specific for FGFRl-IIIb and/or FGFRl-IIIc or FGFRl-(fflc) and/or FGFR-4(HIc), and purifying the antibody that is specific for FGFRl-IIIb and/or FGFRl-IIIc or FGFR1- (IIIc) and/or FGFR-4(IIIc).
- the present invention also provides a method of identifying a fibroblast growth factor receptor (FGFR)- 1 (Dlb), FGFR-l(JIIc), or FGFR- 4(IIIc) specific antibody, or fragment thereof, which is as follows: (i) providing a library of antibody fragments, (ii) screening the library for the antibody that is specific for FGFR- l(IIIb) and/or FGFR-l(i ⁇ c) or the antibody specific for FGFR-l(HIc) and or FGFR-4, and (iii) purifying the antibody that is specific for FGFR-1 (Dlb) and/or FGFR-1 (Die) or the antibody specific for FGFR-1 (IIIc) and/or FGFR-4.
- FGFR-1 fibroblast growth factor receptor
- Screening of the library can involve (i) providing an affinity matrix having the FGFR-l( ⁇ ib), FGFR-1 (Hie), and/or FGFR-4 bound to a solid support, (ii) contacting the affinity matrix with the library of antibody fragments, and (iii) separating the antibody fragments that bind to the affinity matrix from the antibody fragments that do not bind the affinity matrix. These methods can be used to identify an antibody.
- Human antibodies can also be produced using various techniques known in the art, including phage display libraries [Hoogenboom and Winter, J. Mol. Biol., 227:381 (1991); Marks et al., J. Mol. Biol., 222:581 (1991)].
- the techniques of Cole et al. and Boemer et al. are also available for the preparation of human monoclonal antibodies (Cole et al., Monoclonal Antibodies and Cancer Therapy, Alan R. Liss, p.77 (1985) and Boemer et al., J. Immunol., 147(l):86-95 (1991)].
- human antibodies can be made by the introduction of human immunoglobulin loci into transgenic animals, e.g., mice in which the endogenous immunoglobulin genes have been partially or completely inactivated. Upon challenge, human antibody production is observed, which closely resembles that seen in humans in all respects, including gene reanangement, assembly, and antibody repertoire. This approach is described, for example, in U.S. Pat. Nos.
- a purified antibody is one that has been identified and separated and/or recovered from a component of its natural environment. Contaminant components of its natural environment, materials that would interfere with diagnostic or therapeutic uses for the antibody, and may include enzymes, hormones, and other proteinaceous or non- proteinaceous solutes, generally have been removed.
- the monoclonal antibodies of the invention secreted by the subclones may be isolated or purified from the culture medium or ascites fluid by conventional immunoglobulin purification procedures such as, for example protein A-Sepharose, hydrolyapatite chromatography, gel electrophoresis, dialysis, or affinity chromatography.
- the present invention further provides the method of identifying and isolating
- the screening of the library comprises providing an affinity matrix having the FGFRl-(IIIb), FGFRl-(IIIc), FGFR-4( ⁇ ic), and/or alternative splicing form containing ligand binding function bound to a solid support, contacting the affinity matrix with the library of antibody fragments, and separating the antibody fragments that bind to the affinity matrix from the antibody fragments that do not bind the affinity matrix.
- solid support is meant a non-aqueous matrix to which the FGFR-l(IIIb),
- FGFR-1 (IIIc), or FGFR-4(IIIc) can adhere.
- solid phases encompassed herein include those formed partially or entirely of glass (e.g., controlled pore glass), polysaccharides (e.g., agarose), polyacrylamides, polystyrene, polyvinyl alcohol and silicones.
- the solid phase can comprise the well of an assay plate; in others it is a purification column (e.g., an affinity chromatography column).
- This term also includes a discontinuous solid phase of discrete particles, such as those described in U.S. Pat. No. 4,275,149.
- Methods of treatment involving administration to a mammal in need thereof of a therapeutically effective amount of a FGFR-l(IIIb), FGFR-l(TIIc), and/or FGFR-4 antagonist are also provided by the present invention.
- Conditions for which these methods are useful include obesity or an obesity related condition, and diabetes or a diabetes related condition.
- Specific conditions include, but are not limited to hypertension, cardiovascular disease, and angiogenesis.
- the methods are also useful for reducing food intake, body mass index, or altering energy metabolism.
- these methods can be useful in modulating serum triglycerides and leptin levels.
- An obesity related condition refers to a condition, which is the result of or which is exasperated by obesity, such as, but not limited to dermatological disorders such as infections, varicose veins, Acanthosis nigricans, and eczema, exercise intolerance, diabetes (Type 2), insulin resistance, hypertension, hypercholesterolemia, cholelithiasis, orthopedic injury, thromboembolic disease, cancer, and coronary (or cardiovascular) heart disease, particularly those cardiovascular conditions associated with high triglycerides and free fatty acids in an individual, Arthritis, daytime sleepiness, sleep apnea, end stage renal disease, gallbladder disease, gout, heat disorders, impaired immune response, impaired respiratory function, infections following wounds, infertility, liver disease, lower back pain, obstetric and gynecologic complications, pain, pancreatitis, stroke, surgical complications, urinary stress incontinence, gastro-intestinal disorders.
- dermatological disorders such as infections, varicos
- Treatment means any treatment of a disease in an animal and includes: (1) preventing the disease from occurring in a mammal which may be predisposed to the disease but does not yet experience or display symptoms of the disease; e.g., prevention of the outbreak of the clinical symptoms; (2) inhibiting the disease, e.g., arresting its development; or (3) relieving the disease, e.g., causing regression of the symptoms of the disease.
- Effective amount for the treatment of a disease means that amount which, when administered to a mammal in need thereof, is sufficient to effect treatment, as defined above, for that disease.
- the present invention provides a method of treating diabetes (type 2) or a diabetes (type 2) related condition comprising administering to a mammal in need thereof a therapeutically effective amount of an FGFR-l( ⁇ ib), FGFR-l(DIc), FGFR-4(HIc) and/or alternative splicing form containing ligand binding function antagonist.
- a diabetes related condition refers to a condition, which is the result of or which is exasperated by diabetes, such as, but not limited to heart and blood vessel disease, heart attack, stroke, poor blood circulation in legs and feet, high blood pressure, hypertension, blindness or vision problems, kidney failure or infection, urinary bladder infection, nerve damage, slow healing wounds, foot infections, or gum infections.
- the present invention provides a method of reducing food intake comprising administering to a mammal in need thereof a therapeutically effective amount of an antagonist of FGFR-1 (IHb), FGFR-1 (IIIc), FGFR-4(Tflc) and/or an alternative splicing form having ligand binding function antagonist.
- the present invention provides a method of treatment to affect conditions related to obesity and diabetes such as hypertension, cardiovascular disease, blood glucose levels, body mass, serum triglyseride levels, angiogenesis, and/or energy metabolism.
- Angiogenesis is the process of developing new blood vessels that involves the proliferation, migration and tissue infiltration of capillary endothelial cells from preexisting blood vessels.
- the antagonist can be a biological molecule or a small molecule that blocks FGFR-1 (D b), FGFR-1 (Die), and/or FGFR-4 signaling.
- Prefened biological molecules are antibodies or fragment thereof, including the antibodies and fragments thereof described herein.
- the small molecules suitable in the present methods binds FGFR-l(IIIb), FGFR-1 (Die), and/or FGFR-4 internally, inhibits FGFR-l(IIIb), FGFR-l(IIIc), and/or FGFR-4 phosphorylation.
- the small molecule FGFR-1 antagonists inhibit binding of ATP to FGFR-l(DTb), FGFR-l(IIIc), and/or FGFR-4, which can involve competing with ATP for FGFR-1 (Dlb), FGFR-1 (IIIc), and/or FGFR-4.
- these small molecule antagonists of FGFR- l(IIIb), FGFR-1 (IIIc), and/or FGFR-4 inhibit tyrosine kinase activity.
- Prefened small molecules include SU-6668, PD-173074, SU-5402, CHIR-258, PD-166285 or derivatives
- the present invention also provides a method of treatment, wherein the antagonist is a small molecule that blocks FGFR-1 or FGFR-4 signaling.
- the antagonist is a small molecule that blocks FGFR-1 or FGFR-4 signaling.
- FGFR-4 signaling is blocked by a method wherein the FGFR-1 and/or FGFR-4 antagonist binds the FGFR-1 and/or FGFR-4 internally, inhibits the FGFR-1 and/or FGFR-4 phosphorylation, inhibits binding of ATP to FGFR-1 and/ or FGFR-4, competes with ATP for the FGFR-1 and/or FGFR-4, and/or inhibits the FGFR-1 and/or FGFR-4 tyrosine kinase activity.
- the present invention provides the method of treatment wherein the small molecule is selected from the group consisting of pyrimido-pyridines, quinolinones, indolinones such as those shown in Figure 30, as well as, SU-6668 (3-[2,4-Dimethyl-5-(2- oxo-l,2-dihydro-indol-3-ylidenemethyl)-lH-pynol-3-yl]-propionic acid), PD-173074 (1- tert-Butyl-3- ⁇ 6-(3,5-dimethoxy-phenyl)-2-[4-(ethyl-methyl-amino)-butylamino]- pyrido[2,3-d] ⁇ yrimidin-7-yl ⁇ -urea), SU-5402 (3-[4-Methyl-2-(2-oxo-l,2-dihydro-indol-3- ylidenemethyl)-lH-pyrrol-3-
- the method of treatment described herein can be used to treat any suitable mammal, preferably the mammal is a human.
- Immulon® 2B microtiter plates (ThermoLab Systems, Franklin, MA) at concentrations of 0.5-2 ⁇ g/ml for 2 hrs. The plates were then washed with 0.2% Tween20/PBS, and blocked with 5% milk/PBS for 2 hrs before use. Phage or antibody was serially diluted with 5 ⁇ g/ml heparin (Sigma, St Louis, MO), 5% milk, PBS. Recombinant FGFR-1 (R&D Systems) was then added to a final concentration of 1 ⁇ g/ml. The mixture was incubated at room temperature for 1 hr before transfer to the FGF-2 coated plates, and incubated at room temperature for an additional 2 hrs.
- Binding Assay [99] Recombinant FGFRs (R&D systems) at a concentration of 1 ⁇ g/ml in PBS were coated on 96-well plates at room temperature for 2 hrs. The plates were washed 3 times with 0.2% Tween20PBS, and blocked with 5% milk/PBS for 2 hrs before use.
- FR1-H7 or FRl-Al was added to the plate and serially diluted in 0.2% Tween20/PBS. The plate was incubated at room temperature for 2 more hrs. The captured antibodies were detected using an anti-human light chain monoclonal antibody conjugated with HRP (Pierce Biotechnology, Rockford, IL) solution prepared according to supplier's instructions. The binding kinetics of the antibody to FGFR-1 was determined using a BiaCore® 3000 biosensor (BiaCore, Inc., Piscataway, NJ) following the standard protocols suggested by the manufacturer.
- the Binding Kinetic (Kd) of FR1-H7 determined using BiaCore biosensor are as follows: FGFR-lb: 60 pM FGFR-1 c: 40 pM FGFR-2b: > 1 ⁇ M FGFR-2c: > 1 ⁇ M FGFR-3b: > 1 ⁇ M FGFR-3c: > 1 ⁇ M FGFR-4: 0.2 ⁇ M Cell-Based Blocking Assay [100] An FGFR-1 (IIIc) expressing cell line was constructed by retro- viral transfecting L6 (ATCC, Manassas, VA) using a pBABE vector that has a puromycin resistant gene (Invitrogen).
- Transfected cells were cultured in 10% FBS, DMEM (Invitrogen) in 6-well tissue culture plates until reaching confluency, Before the blocking experiment, cells were serum starved for 8-24 hrs at 37°C in DMEM medium that contains 0.1% FBS and 5 ⁇ g/ml heparin. Before the addition of any reagents, plates were put on ice for 1 hr to minimize receptor internalization. For binding experiment, iodinated recombinant FGF-2 was added at various concentrations to the wells of the plates.
- Non-specific interaction was determined in a binding experiment in which iodinated FGF-2 was incubated with the cells in presence of 200 fold excess of cold ligand.
- Phosphorylation Assay [101] FGFR- 1 expressing L6 cells were cultured in 10% FBS, DMEM, in a 24-well tissue culture plate till confluency. Cells were serum starved in 5 ⁇ g/ml heparin, 0.1% FBS, DMEM, for 8-24 hrs. Either FR1-H7 or FRl-Al was added to the media and allowed to bind with the cell surface receptors at 37 °C for 1 hr.
- EMG-2 EMG-2 medium lacking EGF, VEGF and FGF-2 (Cambrex, East Rutherford, NJ) for 24 hrs.
- Quiescent media in wells were aspirated and replaced with EMG-2 that contained all the growth factors mentioned above.
- Antibodies were serially diluted and added to the wells.
- Cells were incubated at 37 °C with 5% CO 2 in a MuaireTM DH autoflow incubator (Cryostar Industries, Inc., White Hall, PA) for 48-72 hrs. Cell growth was determined by monitoring 3 H-thymidine incorporation using a 1450 Micorbeta liquid scintillation counter (Perkin Elmer, Gaithersburg, MD).
- mice were injected intraperitoneally (i.p.) with FR1-H7 at 0.19,
- mice were injected subcuta eously (s.c.) with the antibody at 0.4, 4, and 40 mg/kg body weight.
- mice were treated with saline i.p. or s.c.
- mice received no additional treatments.
- mice treated with FR1-H7 exhibited decreases in body weight, food intake, muscle and fat mass, energy expenditure and Respiratory Exchange Ratio (RER) compared to the controls (Fig. 26).
- RER Respiratory Exchange Ratio
- a paired-feeding experiment was also conducted which food consumption of control antibody treated animals was restrained to exact that of FR1-H7 treated animals (Fig. 27). Animals from the two treatment groups exhibited identical weight-loss trajectories in a 5-day period. Moreover, body composition (Day 1 and 5) and energy consumption determined for the two groups were mostly indistinguishable.
- a phage-displayed human Fab library from Dyax Corp. (Cambridge, MA) was panned for anti-FGFR-l(IIIb) monoclonal antibody (Fab) clones.
- Polystyrene Maxi-soap tubes (75x12mm, Nalge Nunc International, Rochester, NY) were coated with 50 ⁇ g of FGFR-l(IIIb) (R&D Systems, Minneapolis, MN) overnight, and blocked with 3% milk/PBS at 37 °C for 2 hrs.
- a mixture of 0.8 ml of phage library (>10 13 cfu ml), 200 ⁇ l of 2 mg ml L C-1C11 (ImClone Systems Incorporated, New York, NY), and 200 ⁇ l of 18% milk/PF3S were added and incubated in the tube at room temperature for 2 hrs.
- LMC- 1C11 antibody served to block the retention of Fab clones that are reactive only to the Fc- tag of the recombinant receptor.
- the tube was washed 15 times with 0.1% tween-20/PBS (PBST), followed by 15 times with PBS.
- Bound Fab-phage was eluted by incubating the tube with 1 ml of freshly made 100 mM triethylamine (SIGMA, St Louis, MO) at room temperature for 10 min. The eluent was transfened to a 50 ml Falcon tube containing 0.5 ml 1 M Tris-HCl buffer, pH 7.5. Phage was rescued by adding 12.5 ml and 1 ml of fresh E.coli TGI cells (ODeoor 0.5 -0.8) to the eluent and panning tube, respectively. E.coli cells were incubated at 37 °C without shaking for 30 min, and then with shaking at 100 rpm for an additional 30 min. Infected TGI cells were combined and grown in 2xYT(Bio 101® systems, Carlsbad, CA)/Amp/glucose (2xYTAG) at 30 °C overnight, then harvested and stored at —80 °C for future use.
- 2xYT Bio 101® systems, Carlsbad,
- Phage was grown by culturing 25 ml infected cells in presence of 1 ml
- M13KO7 helper phage (Invitrogen, Carlsbad, CA). The culture was incubated at 37 °C without shaking for 30 min, and with shaking (225 rpm) for an additional 30 min. The cell culture was transfened into a 50 ml Falcon® tube (Becton Dickinson, Franklin lakes, NJ), and centrifuged at l,500x g for 10 min. The cell pellet was then re-suspended in 25 ml of 2xYT/ Amp Kan (2xYTAK) medium, transfened into a fresh 250 ml flask, and grown at 30 °C overnight with shaking (225rpm).
- 2xYT/ Amp Kan (2xYTAK 2xYTAK
- the culture was then transfened into a centrifuge tube and centrifuged at 7,000x g for 10 min. Supernatant was carefully removed to a fresh centrifuge tube, and mixed with PEG/NaCl solution (6:1, v:v). The mixture was incubated on ice for 1 hr, and centrifuged at 20,000x g for 30 min. Phage pellet was re-suspended in 1 ml PBS.
- mice C57 black mice and db/db mice were tested (The Jackson Laboratory, Bar Harbor, Maine). The C57 mice were injected with 0.8 mg/kg, 4 mg/kg, and 40 mg/kg antibody and saline on a
- mice were injected subcutaneously with 4 mg/kg antibody on a Monday, Wednesday, and Friday schedule with body weights being measured before each injection and on day 7. Food intake was monitored as well on days
- the db/db animals were sacrificed on day 7 and their intrascapular brown fat, epididymal white adipose tissue, and inguinal subcutaneous white adipose tissue were sampled and weighed.
- Example 5 In Vitro Activity (FR1-H7) [118] ELISA and immunoprecipitation was performed using antibody FR1 -H7. The
- Fabs were screened according to their ability to prevent FGF from binding to FGFR-1.
- the binding specificity of the antibody was examined using an ELISA binding assay, and the results are shown in Figure 3.
- FR1-H7 binds FGFR-1 (Illb) and — l(HIc) with strong affinities, but does not recognize any of the other FGFRs.
- Results from kinetic analysis indicated the antibody binds to FGFR-lb and -lc equally well.
- the K D S of the interactions were determined to be approximately 50 pM for both receptors.
- FIG. 4A &4B shows the inhibitory effect of FR1-H7 on ligand-receptor binding as determined in an ELISA blocking assay.
- Two FGFR1 -binding ligands, FGF-1 ( Figure 4A) and FGF-2 ( Figure 4B) were tested in the blocking assay.
- FR1-H7 was found to block recombinant FGFR-l(IIIb) and — 1 (IIIc) equally well in their binding to FGF-1, with IC 0 s of approximately 5 nM.
- the antibody also blocks the receptors from binding to FGF-2, with IC 50 S in the range of 2-5 nM, although it is slightly more potent in inhibiting FGFR-l(IIIb) than -l(IIIc).
- the blocking activities to fully active, native FGFR-1 receptor were determined in the cell-based blocking assay.
- the total binding of FGF-2 to FGFR-1 -expressing cells has two components: non-specific binding, and specific binding. The latter accounts for the majority of the total binding.
- Figure 5B shows that FR1-H7 inhibits the specific binding of 125 I-FGF-2 to the cells, and the blocking is near completion at the concentration of 200 nM.
- the IC 50 is lower than 5 nM by estimation.
- Example 7 -Ligand Mediated FGFR-1 Signaling, Cell Growth In Vitro (FR1-H7) [120] Under normal condition, the activation of FGFRs is ligand-dependent. The blocking of ligand binding by FR1-H7 consequently leads to inhibition of auto- phosphorylation of the receptor. This is demonstrated in Figure 6, in which the western blot was probed with anti-phospho-tyrosine antibody for activated receptor - the upper blot was probed with anti-phospho-tyrosine antibody and the lower blot showed control protein bands in the cell lysates for estimation of relative gel loading. The results show that the FR1-H7 by itself does not activate the receptor, and significantly inhibits FGF-2 mediated receptor phosphorylation.
- HUVEC is known to express FGFR-l(IIIb) on the cell surface (Feming and
- FR1-H7 induces reversible weight loss in a dose-dependent manner. Both s.c. and i.p. administration of FR1-H7 caused dose-dependent weight loss of the animals (Figure 9). At the two lowest dosages, 0.19 and 0.4 mg/kg, mice had slight weight gains that are identical as the untreated or vehicle treated animals. At 1.9 mg/kg dosage, steep weight loss of -20% of the total body weight occuned within the first 3 treatments, and then the weights of the animals showed a trend of stabilization. Moderate weight loss ( ⁇ 0.5 g) continued one week after the treatment was stopped. This was followed by rapid recovery of the weights.
- Non-fasting blood glucose level was determined one week after the end of the antibody treatment. It appeared that the antibody reduced the blood glucose in a dose- dependent manner (Figure 12A - Effect of FR1-H7 on non-fasted blood glucose;Mean +/- SEM). The greatest reduction occuned in 19 mg/kg i.p. and 40 mg/kg s.c. groups, which amounted to -1/3 of the normal glucose level. On day 64, 52 days after the final treatment, non-fasted blood glucose was again measured. However, serum glucose levels were restored to normal range by day 64 after the animals fully recovered their body weights (Figure 12B - Effect of FR1-H7 on non-fasted blood glucose after weights are fully recovered; Mean +/- SEM).
- Example 11 Reduction in Adipose Tissue, Serum Triglycerides, Insulin, and Leptin [126]
- nude mice were treated with a single injection of 4 mg/kg FR1-H7 s.c, and monitored the effects 48 hours after.
- the averaged weight in the antibody-treated group was reduced by approximately 6% compared to that of the control groups. To investigate the source of this reduction, the weight measurement of representative tissue samples was taken.
- each bar represents the value calculated aslOOx the ratio of tissue weight over total body weight; enor bars are standard deviation
- weight reduction of approximately 60% was observed in parametrial fat pad, while the weights of muscle, liver, and spleen appear to be normal.
- FIG. 15A-D show that FR1-H7 did not affect the serum glucose level 48 hours after the treatment. However, serum triglycerides, insulin, and leptin levels were significantly reduced, indicating that FR1-H7 systematically affected the energy metabolism of the animals. There were no significant differences in the levels of ALT, CPK, BUN, total serum proteins, and serum albumin between the antibody-treated and control groups, suggesting normal liver, muscle and kidney function in the treated animals.
- Example 12 Induction of Weight Loss
- FRl-Al exhibits strong binding affinity to FGFR-l(IIIc), and moderate affinity to FGFR-4. It shows little binding to all the other receptors ( Figure 20).
- the K D S towards these receptors as determined from kinetic analyses are as follows: FGFR-lb: >10 ⁇ M FGFR-lc: 0.7 nM FGFR-2b: > 10 ⁇ M FGFR-2c: >10 ⁇ M FGFR-3b: >10 ⁇ M FGFR-3c: >10 ⁇ M FGFR-4: 90 nM
- Figure 21 shows the inhibitory effects of FRl-Al on ligand-receptor binding as determined in an ELISA blocking assay.
- Two FGFR-1 (Die) binding ligands, FGF-1 and FGF-2 were tested in the blocking assay.
- FRl-Al blocked the binding of FGFR-1 (Die) to FGF-1 and FGF-2 with ICsoS of approximately 5 and 10 nM, respectively.
- FRl-Al caused rapid weight loss to female athymic nude mice. As shown in Figure 24, on day 5, after two treatments, mice in 2 mg/kg dosage group lost an average of -9% of the body weight compared to the control. Mice in 20 mg/kg group lost -23%. Non-fast food intake, measured over trie period between the first and second treatments, was reduced by -14% and -44% in 2 mg/kg and 20 mg/kg groups, respectively ( Figure 25).
- FR1-4H (Fig. 28) was clones. Through BiaCore® analyses, the KDa of this antibody to FGFR- l(IIIb) was determined to be 1.1 nM. In comparison, the KDa to FGFR-1 (IIIc) was greater than 10 ⁇ M. Therefore, FR1-4H is considered to be specific to only the b-splicing form of FGFR-1 . Like FRl-Al and FR1-H7, FR1-4H is a neutralizing antibody, which blocks the receptor from binding to the ligand (Fig. 29). It was therefore deduced that FR1-4H would afford many similar effects displayed by the other two FGFR-1 antibodies as described previously.
- FR1 - Al and FR1 -H7 exhibited high affinity binding towards FGFR- 1 , and low affinity binding towards FGFR-4. Both antibodies could inhibit the ligand-induced activation of FGFR-1 potently. In animals, the two antibodies produced almost identical weight-loss phenomena, accompanied by significant food intake reduction. From the commonalities of these two antibodies it may be concluded that other FGFR antagonists are capable of inducing weight reduction through a FGFR-1 or FGFR-4 pathway related anorexic effect.
- FGFR-l(IIIb) recombinant protein was used instead of FGFR-1 (IIIc) in all occasions.
- FR1-4H inhibited the binding of FGFR-(IIIb) to FGF Ligand (Fig. 29). Percent binding was determined using the ELISA blocking assay described in Examples 6 and 14. Percent binding was statistically reduced by treatment with FR1-4H over control above lnM.
- Immulon® 2B microtiter plates (ThermoLab Systems, Franklin, MA) by incubating 50 ⁇ l/well of the solution (5 ⁇ g/ml in PBS) for 12 hours at 4 °C. The solution was then disposed, and the plate was washed twice with 200 ⁇ l washing buffer (PBS, 0.1% Tween-
- Example 20 - Phosphorylation assay for small molecule inhibitors The phosphorylation assay for small molecules is essentially the same as the phosphorylation assay described in Examples 7 and 15 and Phosphorylation Assay, except that small molecule compounds was used instead of FGFR-1 antibodies in all occasions.
- FGFR small molecule inhibitors inhibited the auto-phosphorylation of FGFR-1 (Die) in a cell-based phosphorylation assay (Fig. 31). Equal amount of cell lysates were applied to each sample lane. Receptor auto-phosphorylation was probed using anti-phospho-tyrosine antibody as described in the original patent.
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- 2004-10-18 DK DK04796034.9T patent/DK1680140T3/en active
- 2004-10-18 PT PT04796034T patent/PT1680140E/en unknown
- 2004-10-18 SI SI200431700T patent/SI1680140T1/en unknown
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- 2004-10-18 DE DE602004032370T patent/DE602004032370D1/en active Active
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- 2004-10-18 US US10/575,977 patent/US20070274981A1/en not_active Abandoned
- 2004-10-18 WO PCT/US2004/034970 patent/WO2005037235A2/en active Application Filing
- 2004-10-18 EP EP04796034A patent/EP1680140B1/en not_active Not-in-force
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2011
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Also Published As
Publication number | Publication date |
---|---|
US20070274981A1 (en) | 2007-11-29 |
SI1680140T1 (en) | 2011-08-31 |
EP2060270A2 (en) | 2009-05-20 |
ES2361917T3 (en) | 2011-06-24 |
EP2229955A1 (en) | 2010-09-22 |
CA2762955A1 (en) | 2005-04-28 |
CY1111479T1 (en) | 2015-08-05 |
PL1680140T3 (en) | 2011-11-30 |
EP1680140A4 (en) | 2007-12-05 |
US20120121609A1 (en) | 2012-05-17 |
PT1680140E (en) | 2011-05-31 |
JP4686465B2 (en) | 2011-05-25 |
DE602004032370D1 (en) | 2011-06-01 |
EP2060270A3 (en) | 2009-12-09 |
EP1680140A2 (en) | 2006-07-19 |
WO2005037235A3 (en) | 2005-12-22 |
DK1680140T3 (en) | 2011-06-14 |
CA2542638A1 (en) | 2005-04-28 |
ATE506077T1 (en) | 2011-05-15 |
EP1680140B1 (en) | 2011-04-20 |
JP2008501302A (en) | 2008-01-24 |
US8263074B2 (en) | 2012-09-11 |
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