WO2023043156A1 - 항-vegfr2(kdr) 개량 항체 및 이의 용도 - Google Patents
항-vegfr2(kdr) 개량 항체 및 이의 용도 Download PDFInfo
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Classifications
-
- 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
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
Definitions
- the present invention relates to anti-VEGFR2 (KDR) improved antibodies or antigen-binding fragments thereof exhibiting improved properties and uses thereof.
- the present invention substitutes the heavy chain FR (framework regoin) of a human antibody that specifically binds to VEGFR2/KDR from VH1 to VH3 and the light chain FR (framework regoin) from VL1 to VK1, and induces mutation to induce antigenic
- angiogenesis angiogenesis
- VEGFR2/KDR is the primary angiogenic receptor, binds to VEGF isoforms A, C, D and E and is important for endothelial cell differentiation as well as mitogenic, angiogenic and invasiveness-enhancing effects of VEGF.
- Anti-VEGFR2 antibodies are all known VEGF isotypes
- VEGFR2/KDR VEGFR2/KDR
- targeting the receptor reduces the probability of completely inhibiting signaling even in the presence of very high levels of VEGF isoforms. increase
- Angiogenesis means the generation of new blood vessels from existing blood vessels by the growth, division, migration, etc. of endothelial cells. In adults, except for special cases such as wound healing and female reproductive cycle, It doesn't happen. However, it is associated with tumor growth and metastasis, age-related macular degeneration, rheumatoid arthritis, diabetic retinopathy, psoriasis and chronic inflammation. Excessive angiogenesis has been reported in the same disease (Cameliet and Jain, Nature, 407:249, 2000), and for this reason, many efforts have been made to treat diseases, especially tumors, using angiogenesis inhibitors.
- vascular endothelial growth factor vascular endothelial growth factor
- EGF epidermal growth factor
- PDGF platelet-derived growth factor
- TGFb transforming growth factor
- FGF fibroblast growth factor
- endothelial cell growth factor is an endothelial cell-specific factor directly involved in the growth, differentiation and migration of endothelial cells. is the most abundant isoform (Tisher et al., J Biol Chem, 266: 11947, 1991).
- Endothelial growth factor regulates the formation of new blood vessels from the differentiation of endothelial precursors (angioblasts) in situ, embryonic tissue (Breier et al., Development (Camb), 114:521, 1992), macrophages , expressed in proliferating epithelial keratinocytes during wound healing (Brown et al., J. Exp. Med., 176:1375, 1992) and may be responsible for tissue edema associated with inflammation (Ferrara et al., Endocr Rev., 13:18, 1992).
- VEGF vascular endothelial growth factor
- VEGF receptor The biological function of VEGF is mediated through the VEGF receptor, which has high affinity for VEGF, and the receptor is endothelial cells during embryogenesis (Millauer et al., Cell, 72: 835, 1993) and during tumorigenesis. is selectively expressed in
- the VEGF receptor (VEGFR) is a class III receptor-type tyrosine kinase characterized by having several, usually 5 or 7, immunoglobulin-like loops in its aminoterminal extracellular receptor ligand-binding domain (Kaipainen et al ., J. Exp. Med., 178: 2027, 1993).
- the other two sites include a transmembrane site and a carboxy-terminal intracellular catalytic domain interrupted by the insertion of a hydrophilic interkinase sequence of variable length, termed the kinase insert domain (Terman et al., Oncogene, 6: 1677, 1991 ).
- VEGFR is the fms-like tyrosine kinase receptor (flt-1), or VEGFR-1 (Shibuya et al., Onco gene, 5: 519, 1990; WO 92/14248; Terman et al., Oncogenes, 6: 1677, 1991) and receptor/fetal kinase containing kinase insert domains (KDR/flk-1), or VEGFR-2 (Matthews et al. al., Proc. Natl. Acad. Sci. USA, 88:9026, 1991).
- VEGFR-3 flt-4
- VEGF homologs VEGF-C and VEGF-D plays an important role in the development of lymphatic vessels.
- Flk-1 High levels of Flk-1 are expressed by endothelial cells infiltrating gliomas. (Plate et al., Nature 359:845, 1992). Flk-1 levels are specifically upregulated by VEGF produced by human glioblastomas (Plate et al., Cancer Res. 53: 5822, 1993).
- VEGF vascular endothelial growth factor
- VEGF activity inhibits the growth of human tumor grafts in nude mice (Kim et al., Nature 362: 841, 1993), suggesting that VEGF in tumor-associated angiogenesis indicates that it plays a direct role.
- mAb neutralizing anti-VEGF monoclonal antibody
- VEGF ligands are upregulated in tumor cells and their receptors are upregulated in tumor-infiltrating vascular endothelial cells, the expression of VEGF ligands and their receptors is low in normal cells not associated with angiogenesis. Therefore, these normal cells block the interaction between VEGF and its receptors, so that angiogenesis is inhibited, and thus tumor growth does not occur.
- VEGFR-2 High levels of VEGFR-2 are expressed by endothelial cells infiltrating gliomas and are specifically upregulated by VEGF produced by human glioblastomas (Plate et al., Nature, 359:845, 1992; Plate et al. al., Cancer Res., 53:5822, 1993). Since VEGFR-2 transcripts are rarely detected in normal brain endothelial cells, high levels of VEGFR-2 expression in glioblastoma-associated endothelial cells (GAEC) indicate that receptor activity is induced during tumorigenesis.
- GEC glioblastoma-associated endothelial cells
- VEGF is expressed at high levels in various types of tumors (Plate et al., Nature, 359:8435, 1992; Dvorak et al., J. Exp. Med., 174:1275, 1991), and new capillaries They cluster around VEGF-producing tumor cells (Plate et al., Nature, 359:8435, 1992). VEGF expression is strongly up-regulated under hypoxic conditions, such as those associated with rapidly growing tumors (Shweiki et al., Nature, 359:843, 1992).
- VEGF neutralization by antibodies such as Avastin is associated with cancer or clinically approved therapies for inhibiting other angiogenic diseases such as AMD.
- Avastin Ferrara et al., Nat Rev Drug Discov., 3(5):391, 2004; Avery et al., Ophthalmology, 113(3):363, 2006
- resistance to VEGF blockade was found even when combined with chemotherapy. This resistance may be associated with remodeled vasculature and increased expression of other angiogenic factors. Accordingly, there is still a need in the art for improved compositions and methods for inhibiting cancer and other diseases associated with angiogenesis.
- TKIs tyrosine kinase inhibitors
- anti-KDRP antibodies can inhibit KDR-mediated angiogenesis
- the antibody approach has advantages over TKIs.
- anti-KDR antibodies are more specific KDR targets (ie, anti-KDR antibodies do not inhibit other VEGF receptors). Because of this high specificity, anti-KDR antibodies can limit and/or avoid off-target effects and toxicity caused by less specific TKIs (Witte et al., Cancer Metastasis Rev., Jun. ;17(2):155, 1998).
- anti-KDR antibodies are expected to prevent all known VEGFs from binding to VEGFR2/KDR.
- Anti-KDR antibodies may have a stronger inhibitory effect on tumor angiogenesis than simply blocking VEGF-A. It is possible that therapy with anti-KDR antibodies may be effective in cases of Avastin resistance.
- the inventors of the present application have substituted the FR (framework regoin) of the heavy chain variable region from VH1 to VH3 and the light chain FR (framework regoin) to VL1 in order to improve an antibody that specifically binds to the existing VEGFR2 / KDR. was substituted with VK1, and mutations were induced in the CDR3 regions of the heavy and light chains to prepare a novel antibody having increased affinity for an antigen, and the present invention was completed.
- An object of the present invention is to provide improved antibodies or antigen-binding fragments of antibodies having improved binding ability to VEGFR2/KDR.
- Another object of the present invention is to provide a nucleic acid encoding the antibody or antigen-binding fragment thereof.
- Another object of the present invention is to provide a vector containing the nucleic acid, a transformed cell containing the vector, and a method for preparing the same.
- Another object of the present invention is to provide a composition for diagnosing angiogenic diseases comprising the antibody or antigen-binding fragment thereof.
- Another object of the present invention is to provide a composition for co-administration with other therapeutic agents containing the antibody or antigen-binding fragment thereof.
- the present invention provides a heavy chain CDR1 comprising a sequence selected from the group consisting of SEQ ID NOs: 1, 7, 13, 19 and 25;
- a heavy chain CDR2 comprising a sequence selected from the group consisting of SEQ ID NOs: 2, 8, 14, 20 and 26, and
- a heavy chain variable region comprising a heavy chain CDR3 comprising a sequence selected from the group consisting of SEQ ID NOs: 3, 9, 15, 21, 27, 51, 52 and 53, and
- a light chain CDR1 comprising a sequence selected from the group consisting of SEQ ID NOs: 4, 10, 16, 22, and 28;
- a light chain CDR2 comprising a sequence selected from the group consisting of SEQ ID NOs: 5, 11, 17, 23 and 29, and
- VEGFR2/KDR binds to VEGFR2/KDR, including a light chain variable region comprising a light chain CDR3 comprising a sequence selected from the group consisting of SEQ ID NOs: 6, 12, 18, 24 and 30.
- the present invention also relates to an antibody that binds to VEGFR2/KDR comprising a heavy chain variable region comprising a sequence having 80% or more homology with a sequence selected from the group consisting of SEQ ID NOs: 32, 36, 40, 44, 48, or its An antigen-binding fragment is provided.
- the present invention also relates to an antibody that binds to VEGFR2/KDR comprising a light chain variable region comprising a sequence having 80% or more homology with a selected sequence selected from the group consisting of SEQ ID NOs: 34, 38, 42, 46, and 50 or an antigen-binding fragment thereof.
- the present invention also provides a heavy chain variable region comprising a sequence having 80% or more homology with a sequence selected from the group consisting of SEQ ID NOs: 32, 36, 40, 44, 48 and SEQ ID NOs: 34, 38, 42, 46, 50 Provides an antibody or antigen-binding fragment thereof that binds to VEGFR2 / KDR comprising a light chain variable region comprising a sequence having 80% or more homology with a selected sequence selected from the group consisting of.
- the present invention also provides nucleic acids encoding the antibodies or antigen-binding fragments thereof.
- the present invention also provides a vector containing the nucleic acid.
- the present invention also provides a transformed cell comprising the vector.
- the present invention also provides a method for producing the antibody or antigen-binding fragment thereof comprising the following steps: (a) culturing the cells; and (b) recovering the antibody or antigen-binding fragment thereof from the cultured cells.
- the present invention also provides a composition for preventing or treating angiogenic diseases comprising the antibody or antigen-binding fragment thereof.
- the present invention also provides a composition for diagnosis of angiogenic disease comprising the antibody or antigen-binding fragment thereof.
- the present invention also provides a composition for preventing or treating tumor or cancer comprising the antibody or antigen-binding fragment thereof.
- the present invention also provides a composition for co-administration with other therapeutic agents containing the antibody or antigen-binding fragment thereof.
- Figure 1 is a sequence grafted with the heavy chain CDR sequence of 6A6.
- Figure 2 is a sequence grafted with the light chain CDR sequence of 6A6.
- FIG. 3 shows ELISA results of evaluating the binding of transiently expressed and purified anti-Ang2 antibodies to human and mouse Ang2 and Ang1.
- Figure 4 is a result showing the ability to neutralize human and mouse Ang2 / Tie2 binding of the selected anti-Ang2 antibody.
- the present invention relates to improved antibodies of fully humanized antibodies that neutralize vascular endothelial growth factor receptors.
- it relates to improved antibodies of human monoclonal antibodies (registered patent No. 10-0883430) neutralizing vascular endothelial growth factor receptors and their uses.
- the inventors of the present application were invented from a fully human antibody library and improved a unique antibody that targets VEGFR-2/KDR and at the same time has reactivity to mouse or rat-derived flk-1 (a VEGFR-2 homologue). Although the superiority of the antibody has been proven through clinical trials, the binding ability of the antibody protein to the antigen is rather low and the in vivo half-life is short. By improving this, it is expected to increase efficacy as an immuno-anticancer agent and increase efficacy in diseases related to angiogenesis.
- FR frame regoin of the heavy chain variable region
- light chain FR framework regoin
- the improved antibody was screened in the following manner. First, the CDR region sequence and framework (FR) sequence of 6A6 were identified, and the heavy chain CDR sequence was grafted to the human germline VH3 sequence and the light chain CDR sequence was grafted to the human germline VK1 using a CDR grafting technique.
- FR framework
- CDR grafting is generally a method of isolating DNA encoding the variable region sequence of a mouse monoclonal antibody, securing a CDR sequence through gene cloning, and then transplanting the CDR sequence into a suitable human antibody sequence in silico ( Hou S, et al.Humanization of an anti-CD34 monoclonal antibody by complementarity-determining region grafting based on computer-assisted molecular modeling.J Biochem.2008;144(1):115-20;and Kashmiri SV, De Pascalis R, Gonzales NR, Schlom J. SDR grafting--a new approach to antibody humanization.Methods.2005;36(1):25-34).
- the framework of 6A6 with human germline VH1/VL1 was replaced with human germline VH3/VK1.
- a heavy chain CDR1 comprising a sequence selected from the group consisting of SEQ ID NOs: 1, 7, 13, 19 and 25,
- a heavy chain CDR2 comprising a sequence selected from the group consisting of SEQ ID NOs: 2, 8, 14, 20 and 26, and
- a heavy chain variable region comprising a heavy chain CDR3 comprising a sequence selected from the group consisting of SEQ ID NOs: 3, 9, 15, 21, 27, 51, 52 and 53, and
- a light chain CDR1 comprising a sequence selected from the group consisting of SEQ ID NOs: 4, 10, 16, 22, and 28;
- a light chain CDR2 comprising a sequence selected from the group consisting of SEQ ID NOs: 5, 11, 17, 23 and 29, and
- an antibody or antigen-binding fragment thereof that binds to VEGFR2/KDR comprising a light chain variable region comprising a light chain CDR3 comprising a sequence selected from the group consisting of SEQ ID NOs: 6, 12, 18, 24 and 30.
- antibody refers to an anti-VEGFR2/KDR antibody that specifically binds to VEGFR2/KDR.
- the scope of the present invention includes not only complete antibody forms that specifically bind to VEGFR2/KDR, but also antigen-binding fragments of the antibody molecules.
- a complete antibody has a structure having two full-length light chains and two full-length heavy chains, and each light chain is linked to the heavy chain by disulfide bonds.
- the heavy chain constant region has gamma ( ⁇ ), mu ( ⁇ ), alpha ( ⁇ ), delta ( ⁇ ), and epsilon ( ⁇ ) types, and subclasses include gamma 1 ( ⁇ 1), gamma 2 ( ⁇ 2), and gamma 3 ( ⁇ 3). ), gamma 4 ( ⁇ 4), alpha 1 ( ⁇ 1) and alpha 2 ( ⁇ 2).
- the constant region of the light chain has kappa ( ⁇ ) and lambda ( ⁇ ) types.
- An antigen-binding fragment of an antibody or antibody fragment refers to a fragment having an antigen-binding function, and includes Fab, F(ab'), F(ab')2, Fv, and the like.
- Fab has a structure having variable regions of light and heavy chains, constant regions of light chains, and a first constant region (CH1) of heavy chains, and has one antigen-binding site.
- Fab' differs from Fab in that it has a hinge region containing one or more cysteine residues at the C-terminus of the heavy chain CH1 domain.
- An F(ab')2 antibody is produced by forming a disulfide bond between cysteine residues in the hinge region of Fab'.
- Double-chain Fv two-chain Fv
- scFv single-chain Fv
- scFv single-chain Fv
- Such antibody fragments can be obtained using proteolytic enzymes (for example, Fab can be obtained by restriction digestion of whole antibodies with papain, and F(ab')2 fragments can be obtained by digestion with pepsin), and gene It can also be produced through recombinant technology.
- proteolytic enzymes for example, Fab can be obtained by restriction digestion of whole antibodies with papain, and F(ab')2 fragments can be obtained by digestion with pepsin
- gene It can also be produced through recombinant technology.
- an antibody according to the present invention is in the form of an Fv (eg scFv) or a complete antibody.
- the heavy chain constant region may be selected from any one isotype of gamma ( ⁇ ), mu ( ⁇ ), alpha ( ⁇ ), delta ( ⁇ ), or epsilon ( ⁇ ).
- the constant region is gamma 1 (IgG1), gamma 3 (IgG3) or gamma 4 (IgG4).
- Light chain constant regions can be of the kappa or lambda type.
- the term “heavy chain” refers to a full-length heavy chain comprising a variable region domain VH comprising an amino acid sequence having sufficient variable region sequence for imparting specificity to an antigen and three constant region domains CH1, CH2 and CH3. and fragments thereof.
- the term “light chain” refers to a full-length light chain and fragments thereof comprising a variable region domain VL and a constant region domain CL comprising an amino acid sequence having a sufficient variable region sequence to impart specificity to an antigen. I mean everything.
- Antibodies of the present invention include monoclonal antibodies, multispecific antibodies, human antibodies, humanized antibodies, chimeric antibodies, single chain Fvs (scFV), single chain antibodies, Fab fragments, F(ab') fragments, disulfide-linked Fvs (sdFV) and anti-idiotypic (anti-Id) antibodies, or epitope-binding fragments of such antibodies; and the like.
- the monoclonal antibody refers to an antibody obtained from a population of substantially homogeneous antibodies, ie, the same thing except for possible naturally occurring mutations that may be present in minor amounts in the individual antibodies comprising the population. Monoclonal antibodies are highly specific, directed against a single antigenic site. In contrast to conventional (polyclonal) antibody preparations, which typically include different antibodies directed against different determinants (epitopes), each monoclonal antibody is directed against a single determinant on the antigen.
- Epitope means a protein determinant to which an antibody can specifically bind.
- An epitope usually consists of a group of chemically active surface molecules, such as amino acids or sugar side chains, and usually has specific three-dimensional structural characteristics as well as specific charge characteristics. Conformational and non-stereotypic epitopes are distinguished by loss of binding to the former but not to the latter in the presence of a denaturing solvent.
- non-human (eg, murine) antibodies are chimeric antibodies that contain minimal sequence derived from non-human immunoglobulin.
- humanized antibodies are derived from a non-human species (donor antibody), such as mouse, rat, rabbit, or non-human, which retains the desired specificity, affinity, and capacity for residues from a hypervariable region of the recipient. It is a human immunoglobulin (recipient antibody) in which residues from a primate hypervariable region have been replaced.
- human antibody is a molecule derived from human immunoglobulin, and means that all amino acid sequences constituting the antibody, including complementarity determining regions and structural regions, are composed of human immunoglobulin.
- heavy and/or light chains are identical to or homologous to corresponding sequences in antibodies that are derived from a particular species or belong to a particular antibody class or subclass, while the remaining chain(s) are from another species or belong to another antibody class or subclass. Included are “chimeric” antibodies (immunoglobulins) that are identical to or homologous to the corresponding sequence in an antibody belonging to a subclass, as well as fragments of such antibodies that exhibit the desired biological activity.
- Antibody variable region refers to the light and heavy chain portions of an antibody molecule that include the amino acid sequences of the complementarity determining regions (CDRs; i.e., CDR1, CDR2, and CDR3), and the framework regions (FR). .
- CDRs complementarity determining regions
- FR framework regions
- VH refers to the variable region of the heavy chain.
- VL refers to the variable region of the light chain.
- CDRs complementarity determining regions
- Each variable region typically has three CDR regions identified as CDR1, CDR2 and CDR3.
- the present invention includes a heavy chain variable region comprising the heavy chain CDR3 of SEQ ID NO: 1 and a light chain variable region comprising the light chain CDR3 of SEQ ID NO: 2.
- the antibody or antigen-binding fragment thereof that binds to VEGFR2 / KDR is a heavy chain variable region comprising the heavy chain CDR1 of SEQ ID NO: 1, the heavy chain CDR2 of SEQ ID NO: 2 and the heavy chain CDR3 of SEQ ID NO: 3, of SEQ ID NO: 4
- a light chain variable region comprising light chain CDR1, light chain CDR2 of SEQ ID NO: 5, and light chain CDR3 of SEQ ID NO: 6;
- a heavy chain variable region comprising the heavy chain CDR1 of SEQ ID NO: 7, the heavy chain CDR2 of SEQ ID NO: 8, and the heavy chain CDR3 of SEQ ID NO: 9, the light chain CDR1 of SEQ ID NO: 10, the light chain CDR2 of SEQ ID NO: 11, and the light chain CDR3 of SEQ ID NO: 12 light chain variable region,
- a heavy chain variable region comprising the heavy chain CDR1 of SEQ ID NO: 13, the heavy chain CDR2 of SEQ ID NO: 14, and the heavy chain CDR3 of SEQ ID NO: 15, the light chain CDR1 of SEQ ID NO: 16, the light chain CDR2 of SEQ ID NO: 17, and the light chain CDR3 of SEQ ID NO: 18. light chain variable region,
- a heavy chain variable region comprising the heavy chain CDR1 of SEQ ID NO: 19, the heavy chain CDR2 of SEQ ID NO: 20, and the heavy chain CDR3 of SEQ ID NO: 21, the light chain CDR1 of SEQ ID NO: 22, the light chain CDR2 of SEQ ID NO: 23, and the light chain CDR3 of SEQ ID NO: 24 light chain variable region,
- a heavy chain variable region comprising the heavy chain CDR1 of SEQ ID NO: 25, the heavy chain CDR2 of SEQ ID NO: 26, and the heavy chain CDR3 of SEQ ID NO: 27, the light chain CDR1 of SEQ ID NO: 28, the light chain CDR2 of SEQ ID NO: 29, and the light chain CDR3 of SEQ ID NO: 30 light chain variable region,
- a heavy chain variable region comprising the heavy chain CDR1 of SEQ ID NO: 13, the heavy chain CDR2 of SEQ ID NO: 14, and the heavy chain CDR3 of SEQ ID NO: 51, the light chain CDR1 of SEQ ID NO: 16, the light chain CDR2 of SEQ ID NO: 17, and the light chain CDR3 of SEQ ID NO: 18 light chain variable region,
- a heavy chain variable region comprising the heavy chain CDR1 of SEQ ID NO: 13, the heavy chain CDR2 of SEQ ID NO: 14, and the heavy chain CDR3 of SEQ ID NO: 52, the light chain CDR1 of SEQ ID NO: 16, the light chain CDR2 of SEQ ID NO: 17, and the light chain CDR3 of SEQ ID NO: 18 a light chain variable region that does, or
- a heavy chain variable region comprising the heavy chain CDR1 of SEQ ID NO: 13, the heavy chain CDR2 of SEQ ID NO: 14, and the heavy chain CDR3 of SEQ ID NO: 53, the light chain CDR1 of SEQ ID NO: 16, the light chain CDR2 of SEQ ID NO: 17, and the light chain CDR3 of SEQ ID NO: 18. It may include a light chain variable region to.
- a "framework region” is a variable region residue other than a CDR residue.
- Each variable region typically has four FRs identified as FR1, FR2, FR3 and FR4.
- Fv fragment is an antibody fragment that contains the complete antibody recognition and binding site. This region consists of a dimer of one heavy chain variable region and one light chain variable region in tight, virtually covalent association, for example, an scFv.
- the “Fab” fragment contains the variable and constant domains of the light chain and the variable and first constant domains of the heavy chain (CH1).
- F(ab')2 antibody fragments generally comprise a pair of Fab fragments covalently linked near their carboxy termini by hinge cysteines between them.
- a “single-chain Fv” or “scFv” antibody fragment comprises the VH and VL domains of an antibody, which domains are present in a single polypeptide chain.
- the Fv polypeptide may further include a polypeptide linker between the VH and VL domains that allows the scFv to form a desired structure for antigen binding.
- the VEGFR2/KDR antibody may include single or double chains. Functionally, the binding affinity of the VEGFR2/KDR antibody is in the range of 10 ⁇ 5 M to 10 ⁇ 12 M.
- the binding affinity of the VEGFR2 / KDR antibody is 10 -6 M to 10 -12 M, 10 -7 M to 10 -12 M, 10 -8 M to 10 -12 M, 10 -9 M to 10 -12 M, 10 -5 M to 10 -11 M, 10 -6 M to 10 -11 M, 10 -7 M to 10 -11 M, 10 -8 M to 10 -11 M, 10 -9 M to 10 -11 M, 10 -10 M to 10 -11 M, 10 -5 M to 10 -10 M, 10 -6 M to 10 -10 M, 10 -7 M to 10 -10 M, 10 -8 M to 10 -10 M, 10 -9 M to 10 -10 M, 10 -5 M to 10 -9 M, 10 -6 M to 10 -9 M, 10 -7 M to 10 -9 M, 10 -8 M to 10 -9 M,
- the present invention is an antibody that binds to VEGFR2 / KDR comprising a heavy chain variable region comprising a sequence having 80% or more homology with a sequence selected from the group consisting of SEQ ID NOs: 32, 36, 40, 44, 48 or an antigen binding thereof It's about shorts.
- the present invention also relates to an antibody that binds to VEGFR2/KDR comprising a light chain variable region comprising a sequence having 80% or more homology with a selected sequence selected from the group consisting of SEQ ID NOs: 34, 38, 42, 46, and 50 Or it relates to an antigen-binding fragment thereof.
- the present invention also provides a heavy chain variable region comprising a sequence having 80% or more homology with a sequence selected from the group consisting of SEQ ID NOs: 32, 36, 40, 44, 48 and SEQ ID NOs: 34, 38, 42, 46, 50 It relates to an antibody or antigen-binding fragment thereof that binds to VEGFR2 / KDR comprising a light chain variable region comprising a sequence having 80% or more homology with a selected sequence selected from the group consisting of.
- the homology is 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92% compared to the entire sequence of the claimed SEQ ID NO. %, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or greater homology.
- the antibody or antigen-binding fragment thereof that binds to VEGFR2/KDR may include a heavy chain variable region selected from the group consisting of SEQ ID NOs: 32, 36, 40, 44, and 48.
- the antibody or antigen-binding fragment thereof that binds to VEGFR2/KDR may include a light chain variable region selected from the group consisting of SEQ ID NOs: 34, 38, 42, 46, and 50.
- It may include the heavy chain variable region of SEQ ID NO: 48 and the light chain variable region of SEQ ID NO: 50.
- “Phage display” is a technique in which a variant polypeptide is displayed as a fusion protein with at least a portion of an envelope protein on the surface of a phage, eg, a filamentous phage particle.
- the usefulness of phage display lies in the fact that large libraries of randomized protein variants can be targeted and rapidly and efficiently sorted for sequences that bind with high affinity to the target antigen. Displaying peptide and protein libraries on phage has been used to screen millions of polypeptides for those with specific binding properties.
- Phage display technology has provided a powerful tool for generating and selecting novel proteins that bind specific ligands (eg antigens). Using phage display technology, large libraries of protein variants can be generated and sequences that bind with high affinity to the target antigen can be rapidly sorted.
- a nucleic acid encoding a variant polypeptide is fused with a nucleic acid sequence encoding a viral envelope protein, eg, a gene III protein or a gene VIII protein.
- Monovalent phage display systems have been developed in which a nucleic acid sequence encoding a protein or polypeptide is fused with a nucleic acid sequence encoding a portion of a gene III protein. In monovalent phage display systems, gene fusions are expressed at low levels and the wild-type gene III protein is also expressed to maintain particle infectivity.
- Phage display technology has several advantages over conventional hybridoma and recombinant methods for producing antibodies with desired characteristics. This technology enables the generation of large antibody libraries with diverse sequences in a short time without using animals. Production of hybridomas or production of humanized antibodies may require several months of production time. In addition, since no immunization is required, the phage antibody library can generate antibodies against toxic or low antigenic antigens. Phage antibody libraries can also be used to generate and identify novel therapeutic antibodies.
- Techniques for generating human antibodies from immunized, non-immunized human, germline sequences, or naive B cell Ig repertoires can be used using phage display libraries.
- a variety of lymphoid tissues can be used to prepare na ⁇ ve or non-immune antigen-binding libraries.
- a technique capable of identifying and isolating high-affinity antibodies from phage display libraries is important for isolating novel antibodies for therapeutic use.
- Isolation of a high affinity antibody from a library may depend on the size of the library, the efficiency of production in bacterial cells and the diversity of the library.
- the size of the library is reduced by inefficient production due to improper folding of the antibody or antigen-binding protein and the presence of stop codons.
- Expression in bacterial cells may be inhibited if the antibody or antigen-binding domain does not fold properly. Expression can be improved by alternating mutations of residues on the surface of the variable/constant interface or selected CDR residues.
- the sequence of the framework region is one element for providing proper folding when generating an antibody phage library in bacterial cells.
- CDR3 regions have been found to be those that often participate in antigen binding. Since the CDR3 region on the heavy chain varies considerably in size, sequence, and structural conformation, various libraries can be prepared using it.
- Diversity can also be generated by randomizing the CDR regions of the variable heavy and light chains using all 20 amino acids at each position.
- the use of all 20 amino acids may result in a high diversity of variant antibody sequences and increase the chance of identifying novel antibodies.
- the antibody or antibody fragment of the present invention may include not only the sequence of the anti-VEGFR2 / KDR antibody of the present invention described herein, but also a biological equivalent thereof to the extent that it can specifically recognize VEGFR2 / KDR.
- additional changes may be made to the amino acid sequence of the antibody to further improve its binding affinity and/or other biological properties.
- modifications include, for example, deletions, insertions and/or substitutions of residues in the amino acid sequence of the antibody.
- Such amino acid variations are made based on the relative similarity of amino acid side chain substituents, such as hydrophobicity, hydrophilicity, charge, size, etc.
- arginine, lysine and histidine are all positively charged residues; Alanine, glycine and serine have similar sizes; It can be seen that phenylalanine, tryptophan and tyrosine have similar shapes. Accordingly, based on these considerations, arginine, lysine and histidine; alanine, glycine and serine; And phenylalanine, tryptophan and tyrosine are biologically functional equivalents.
- the antibodies of the present invention or the nucleic acid molecules encoding them are construed to include sequences showing substantial identity with the sequences described in SEQ ID NOs.
- the above substantial identity is at least 90% when the sequence of the present invention and any other sequence described above are aligned so as to correspond as much as possible, and the aligned sequence is analyzed using an algorithm commonly used in the art. It refers to sequences exhibiting homology, most preferably at least 95% homology, 96% or more, 97% or more, 98% or more, 99% or more homology. Alignment methods for sequence comparison are known in the art.
- NCBI Basic Local Alignment Search Tool is accessible from NCBI, etc., and can be used in conjunction with sequence analysis programs such as blastp, blasm, blastx, tblastn, and tblastx on the Internet.
- the BLAST is accessible at www.ncbi.nlm.nih.gov/BLAST/.
- a sequence homology comparison method using this program can be found at www.ncbi.nlm.nih.gov/BLAST/blast_help.html.
- an antibody or antigen-binding fragment thereof of the present invention may have 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% of the specified sequence described herein or as a whole. , 99%, or greater homology.
- homology can be determined by sequence comparison and/or alignment by methods known in the art. For example, a sequence comparison algorithm (ie, BLAST or BLAST 2.0), manual alignment, or visual inspection can be used to determine the percent sequence homology of a nucleic acid or protein of the invention.
- the present invention relates to a nucleic acid encoding the antibody or antigen-binding fragment thereof.
- the nucleic acid may be selected from the group consisting of SEQ ID NOs: 31, 35, 39, 43, and 47 encoding heavy chain variable regions.
- the nucleic acid may be selected from the group consisting of SEQ ID NOs: 33, 37, 41, 45, and 49 encoding light chain variable regions.
- the antibody or antigen-binding fragment thereof can be recombinantly produced by isolating a nucleic acid encoding the antibody or antigen-binding fragment thereof of the present invention. Nucleic acids are isolated and inserted into replicable vectors for further cloning (amplification of DNA) or further expression. Based on this, the present invention relates to a vector comprising the nucleic acid in another aspect.
- Nucleic acid has the meaning of comprehensively including DNA (gDNA and cDNA) and RNA molecules, and nucleotides, which are the basic building blocks of nucleic acids, include not only natural nucleotides, but also analogs in which sugar or base sites are modified. .
- the sequences of nucleic acids encoding the heavy and light chain variable regions of the present invention may be modified. Such modifications include additions, deletions, or non-conservative or conservative substitutions of nucleotides.
- DNA encoding the antibody is readily isolated or synthesized using conventional procedures (eg, by using oligonucleotide probes capable of specifically binding to DNA encoding the heavy and light chains of the antibody).
- Vector components generally include, but are not limited to, one or more of the following: a signal sequence, an origin of replication, one or more marker genes, an enhancer element, a promoter, and a transcription termination sequence.
- the term "vector” refers to a plasmid vector as a means for expressing a gene of interest in a host cell; cosmid vector; and viral vectors such as bacteriophage vectors, adenoviral vectors, retroviral vectors, and adeno-associated viral vectors.
- the nucleic acid encoding the antibody is operably linked to a promoter.
- “Operably linked” means a functional linkage between a nucleic acid expression control sequence (eg, a promoter, signal sequence, or array of transcriptional regulator binding sites) and another nucleic acid sequence, whereby the control sequence is linked to the other nucleic acid. It will regulate the transcription and/or translation of the sequence.
- a nucleic acid expression control sequence eg, a promoter, signal sequence, or array of transcriptional regulator binding sites
- a strong promoter capable of promoting transcription e.g., tac promoter, lac promoter, lacUV5 promoter, lpp promoter, pL ⁇ promoter, pR ⁇ promoter, rac5 promoter, amp promoter, recA promoter, SP6 promoter, trp promoter and T7 promoter, etc.
- a ribosome binding site for initiation of translation e.g., amp promoter, recA promoter, SP6 promoter, trp promoter and T7 promoter, etc.
- a promoter derived from the genome of a mammalian cell eg, metallotionine promoter, ⁇ -actin promoter, human hemoglobin promoter, and human muscle creatine promoter
- mammalian Promoters derived from animal viruses such as adenovirus late promoter, vaccinia virus 7.5K promoter, SV40 promoter, cytomegalovirus (CMV) promoter, tk promoter from HSV, mouse mammary tumor virus (MMTV) promoter, LTR promoter from HIV , the promoter of Moloney virus, the promoter of Epstein Barr virus (EBV) and the promoter of Rouss sarcoma virus (RSV) can be used, and usually has a polyadenylation sequence as a transcription termination sequence.
- a mammalian Cell eg, metallotionine promoter, ⁇ -actin promoter, human hemoglobin promoter, and human muscle creatine promoter
- mammalian Promoters derived from animal viruses such as
- vectors may be fused with other sequences to facilitate purification of antibodies expressed therefrom.
- Sequences to be fused include, for example, glutathione S-transferase (Pharmacia, USA), maltose binding protein (NEB, USA), FLAG (IBI, USA) and 6x His (hexahistidine; Quiagen, USA).
- the vector contains an antibiotic resistance gene commonly used in the art as a selectable marker, for example, for ampicillin, gentamicin, carbenicillin, chloramphenicol, streptomycin, kanamycin, geneticin, neomycin and tetracycline. There is a resistance gene.
- the present invention relates to a cell transformed with the above-mentioned vector.
- Cells used to generate the antibodies of the present invention may be, but are not limited to, prokaryotic, yeast or higher eukaryotic cells.
- Escherichia coli strains of the genus Bacillus such as Bacillus subtilis and Bacillus thuringiensis, Streptomyces, Pseudomonas (e.g. Pseudomonas putida), Proteus Prokaryotic host cells such as Proteus mirabilis and Staphylococcus (eg, Staphylocus carnosus) can be used.
- Bacillus such as Bacillus subtilis and Bacillus thuringiensis
- Streptomyces Pseudomonas (e.g. Pseudomonas putida)
- Proteus Prokaryotic host cells such as Proteus mirabilis and Staphylococcus (eg, Staphylocus carnosus) can be used.
- animal cells are of greatest interest, and examples of useful host cell lines are COS-7, BHK, CHO, CHOK1, DXB-11, DG-44, CHO/-DHFR, CV1, COS-7, HEK293, BHK, TM4, VERO, HELA, MDCK, BRL 3A, W138, Hep G2, SK-Hep, MMT, TRI, MRC 5, FS4, 3T3, RIN, A549, PC12, K562, PER.C6, SP2/0, NS-0 , U20S, or HT1080, but is not limited thereto.
- the cells can be cultured in various media. Among commercially available media, it can be used as a culture medium without limitation. All other necessary supplements known to those skilled in the art may also be included in suitable concentrations. Culture conditions such as temperature, pH, etc. are already in use with host cells selected for expression and will be apparent to those skilled in the art.
- the antibody or antigen-binding fragment thereof may be recovered by, for example, centrifugation or ultrafiltration to remove impurities, and the resultant may be purified using, for example, affinity chromatography. Additional other purification techniques may be used, such as anion or cation exchange chromatography, hydrophobic interaction chromatography, hydroxylapatite chromatography, and the like.
- the antibody may be an IgG or a fragment including a variable region, that is, ScFv or Fab.
- the variable region of the heavy chain may be IgG1, IgG2, IgG3, or IgG4.
- the present invention relates to a composition for preventing or treating angiogenic diseases comprising the antibody or antigen-binding fragment thereof as an active ingredient.
- Angiogenesis refers to the formation or growth of new blood vessels from previously existing blood vessels, and "angiogenesis-related disease” refers to a disease related to the occurrence or progression of angiogenesis. If it can be treated with the antibody, the disease can be included in the scope of angiogenesis-related diseases without limitation.
- diseases associated with angiogenesis include cancer, metastasis, diabetic retinopathy, retinopathy of prematurity, corneal graft rejection, macular degeneration, angiogenesis Neovascular glaucoma, erythrosis, proliferative retinopathy, psoriasis, hemophilic arthritis, capillary formation of atherosclerotic plaques, keloid , wound granulation, vascular adhesion, rheumatoid arthritis, osteoarthritis, autoimmune diseases, Crohn's disease, restenosis , atherosclerosis, intestinal adhesions, cat scratch disease, ulcer, liver cirrhosis, nephritis, diabetic nephropathy, diabetic Diabetic Foot Ulcers, chronic kidney failure, diabetes mellitus, inflammatory diseases, idiopathic pulmonary fibrosis, sepsis, acute respiratory distress syndrome respiratory distress syndrome) and neurodegenerative diseases, but are not limited thereto.
- the cancer includes esophageal cancer, stomach cancer, large intestine cancer, rectal cancer, oral cancer, pharynx cancer, larynx cancer, Lung cancer, colon cancer, breast cancer, uterine cervical cancer, endometrial cancer, ovarian cancer, prostate cancer, testicular cancer ( testis cancer), bladder cancer, renal cancer, liver cancer, pancreatic cancer, bone cancer, connective tissue cancer, skin cancer, It is selected from the group consisting of brain cancer, thyroid cancer, leukemia, Hodgkin's lymphoma, lymphoma and multiple myeloid blood cancer, but is limited thereto It is not.
- prevention or prophylaxis refers to any measure that inhibits or delays the onset of a disease of interest by administering an antibody or composition of the invention.
- treatment or therapy refers to any action that results in improvement of symptoms or improvement of symptoms of a disease of interest by administration of an antibody or composition of the present invention.
- the present invention for example, (a) a pharmaceutically effective amount of an antibody or antigen-binding fragment thereof to VEGFR2 / KDR according to the present invention; And (b) it may be a pharmaceutical composition for the prevention or treatment of tumor or cancer comprising a pharmaceutically acceptable carrier.
- the present invention may also be a method for preventing or treating tumor or cancer comprising administering the antibody or antigen-binding fragment thereof to a tumor or cancer patient.
- the present invention may be a use of the antibody or antigen-binding fragment thereof for inhibiting the mechanism of VEGFR2 / KDR, and a use for preventing or treating tumor or cancer through it.
- a tumor or cancer that is a disease to which the composition is applied includes a tumor or cancer that typically overexpresses VEGF or VEGFR2/KDR, and a tumor or cancer that does not overexpress VEGF or VEGFR2/KDR.
- tumors or cancers preferred for treatment include melanoma (eg, metastatic malignant melanoma), renal cancer (eg, clear cell carcinoma), prostate cancer (eg, hormone refractory prostate adenocarcinoma).
- pancreatic adenocarcinoma breast cancer, colon cancer
- lung cancer eg, non-small cell lung cancer
- esophageal cancer head and neck squamous cell carcinoma
- liver cancer ovarian cancer
- cervical cancer thyroid cancer
- glioblastoma glioma
- leukemia lymphoma
- the present invention includes refractory or recurrent cancers that can be treated using the antibodies of the present invention.
- the present invention provides, for example, a method for treating angiogenic disease, comprising administering a therapeutically effective amount of the anti-VEGFR2/KDR antibody or antigen-binding fragment thereof to a patient in need of angiogenesis inhibition.
- the treatment of the angiogenic disease may further include identifying a patient in need of angiogenesis inhibition prior to the administering step.
- VEGFR2 / KDR related diseases comprising administering a therapeutically effective amount of the anti-VEGFR2 / KDR antibody or antigen-binding fragment thereof to a patient in need of prevention and / or treatment of VEGFR2 / KDR related diseases
- a method for preventing and/or treating is provided.
- the prevention and/or treatment method may further include identifying a patient in need of prevention and/or treatment of a VEGFR2/KDR-related disease prior to the administration step.
- the pharmaceutical composition may further include a pharmaceutically acceptable carrier, which is commonly used in drug formulations, such as lactose, dextrose, sucrose, sorbitol, mannitol, starch, gum acacia, and calcium phosphate. , alginate, gelatin, calcium silicate, microcrystalline cellulose, polyvinylpyrrolidone, cellulose, water, syrup, methyl cellulose, methylhydroxybenzoate, propylhydroxybenzoate, talc, magnesium stearate, mineral oil, etc. It may be one or more selected from the group consisting of, but is not limited thereto.
- the pharmaceutical composition may further include at least one selected from the group consisting of diluents, excipients, lubricants, wetting agents, sweeteners, flavoring agents, emulsifiers, suspending agents, and preservatives commonly used in the preparation of pharmaceutical compositions.
- an effective amount of the pharmaceutical composition or the antibody or antigen-binding fragment thereof may be administered orally or parenterally.
- parenteral administration intravenous injection, subcutaneous injection, intramuscular injection, intraperitoneal injection, intradermal administration, topical administration, intranasal administration, intrapulmonary administration, intrarectal administration, etc. may be administered.
- the oral composition may be formulated to coat the active agent or protect it from degradation in the stomach.
- the composition may be administered by any device capable of transporting an active substance to a target cell.
- composition of the present invention is administered in a pharmaceutically effective amount.
- pharmaceutically effective amount refers to an amount of a pharmaceutical composition for treating a disease sufficient for a reasonable benefit/risk ratio applicable to all medical treatments. The effective amount depends on the severity of the disease to be treated, the age and sex of the patient, the type of disease, the activity of the drug, the sensitivity to the drug, the time of administration, the route of administration, the rate of secretion, the duration of treatment, co-administration of the drug and other drugs known in the art. It depends on a variety of factors, including parameters. Compositions of the present invention may be administered alone or in combination with other therapies. In such cases, it may be administered sequentially or concurrently with conventional therapies.
- the composition may be administered in a single dose or divided into multiple doses. Taking these factors into full consideration, it is important to administer the smallest amount sufficient to obtain the maximum effect without side effects, and this dosage can be readily determined by a person skilled in the art.
- the dosage of the pharmaceutical composition of the present invention is not particularly limited, but is changed according to various factors including the patient's health condition and weight, the severity of the disease, the type of drug, the route of administration and the time of administration.
- the composition is administered by typically accepted routes, eg, orally, rectally, intravenously, subcutaneously, in mammals, including rats, rats, livestock, humans, etc., in single or multiple doses per day. , intrauterinely or intracerebrovascularly.
- the content of the anti-VEGFR2 / KDR antibody or antigen-binding fragment thereof in the pharmaceutical composition is a formulation method, administration method, patient's age, weight, sex, morbid condition, food, administration time, administration interval, administration route, excretion rate and reaction sensitivity It can be prescribed in various ways by factors such as
- the daily dose of the anti-VEGFR2 / KDR antibody or antigen-binding fragment thereof is 0.001 to 1000 mg / kg, specifically 0.01 to 100 mg / kg, more specifically 0.1 to 50 mg / kg, more specifically 0.1 to 1000 mg / kg. It may range, but is not limited to, 20 mg/kg.
- the daily dose may be formulated as one formulation in unit dose form, formulated in appropriate portions, or prepared by placing it in a multi-dose container.
- the pharmaceutical composition may be co-administered with other drugs such as other angiogenesis inhibitor-related disease treatments, and the dosage, administration method, and type of other drugs may be appropriately prescribed according to the patient's condition.
- the pharmaceutical composition may be formulated in the form of a solution, suspension, syrup or emulsion in an oil or aqueous medium, or in the form of extracts, powders, powders, granules, tablets or capsules. Additional topics may be included.
- the pharmaceutical composition containing the anti-VEGFR2 / KDR antibody or antigen-binding fragment thereof contains the antibody or antigen-binding fragment, it can be formulated as an immunoliposome.
- Liposomes containing antibodies can be prepared according to methods well known in the art.
- the immune liposome is a lipid composition containing phosphatidylcholine, cholesterol and polyethylene glycol-derivatized phosphatidylethanolamine and can be prepared by reverse phase evaporation. (Patent Publication 10-2015-0089329)
- the Fab' fragment of an antibody can be conjugated to a liposome through a disulfide-replacement reaction.
- another embodiment of the present invention provides a pharmaceutical composition for diagnosing a VEGFR2/KDR inhibitor-related disease comprising the anti-VEGFR2/KDR antibody or antigen-binding fragment thereof.
- processing the anti-VEGFR2 / KDR antibody or antigen-binding fragment thereof to the biological sample obtained from the patient Checking the antigen-antibody reaction; And when an antigen-antibody reaction is detected, determining that the patient has symptoms of VEGFR2/KDR activation and/or overproduction, or a disease associated with activation and/or overproduction of VEGFR2/KDR. Or provide a way to inform the diagnosis.
- the biological sample may be selected from the group consisting of cells, tissues, and body fluids obtained from a patient.
- the step of determining whether the antigen-antibody reaction may be performed through various methods known in the art. For example, it can be measured through conventional enzymatic reaction, fluorescence, luminescence and / or radiation detection, specifically, immunochromatography, reverse histochemical staining (Immunohistochemistry), enzyme-linked immunosorbent assay (enzymeliked immunosorbent assay) : ELISA), radioimmunoassay (RIA), enzyme immunoassay (EIA), fluorescence immunoassay (FIA), luminescence immunoassay (LIA), Western blotting, etc. It may be measured by a method selected from the group consisting of, but is not limited thereto.
- Cancer can be diagnosed by analyzing the final signal intensity by the immunoassay process. That is, when the protein of the marker of the present invention is highly expressed in a biological sample and the signal is stronger than that of a normal biological sample (eg, normal gastric tissue, blood, plasma or serum), cancer is diagnosed.
- a normal biological sample eg, normal gastric tissue, blood, plasma or serum
- the present invention relates to a kit for diagnosing cancer comprising the composition for diagnosing cancer.
- the kit according to the present invention can diagnose cancer by analyzing the signal indicated by the reaction between the sample and the antibody.
- the signal may include, but is not limited to, enzymes linked to the antibody, such as alkaline phosphatase, ⁇ -galactosidase, horse radish peroxidase, luciferase, or cytochrome P450.
- the substrate for the enzyme is bromochloroindolyl phosphate (BCIP), nitro blue tetrazolium (NBT), naphthol-AS-B1-phosphate (naphthol -AS-B1-phosphate) and ECF (enhanced chemifluorescence) are used, and when horseradish peroxidase is used, chloronaphthol, aminoethylcarbazole, diaminobenzidine, D-luciferin, lucigenin (bis-N-methylacridinium nitrate), resorufin benzyl ether, luminol, amplex red reagent (10-acetyl-3,7-dihydroxyphenoxazine), HYR (p-phenylenediamine-HCl and pyrocatechol) , TMB (tetramethylbenzidine), ABTS (2,2'-Azine-di[3-ethylbenzthiazoline), ABTS (2
- the kit according to the present invention may include a label that generates a detectable signal
- the label may include a chemical (eg, biotin), an enzyme (alkaline phosphatase, ⁇ -galactosidase, horseradish peroxidase and cytochrome P450), radioactive materials (eg C14, I125, P32 and S35), fluorescent materials (eg fluorescein), luminescent materials, chemiluminescent materials and fluorescence resonance energy transfer (FRET) It may include, but is not limited thereto.
- Measurement of the activity or signal of an enzyme used for the diagnosis of angiogenesis can be performed according to various methods known in the art.
- Patients to be administered or diagnosed with the pharmaceutical composition may be mammals including primates including humans and monkeys, rodents including mice and rats, and the like.
- the VEGFR2/KDR related diseases include cancer; cancer metastasis; eye diseases such as retinopathy of prematurity, macular degeneration (eg, age-related macular degeneration), diabetic retinopathy, and neovascular glaucoma; asthma; rheumatoid arthritis; psoriasis; inflammatory diseases such as pneumonia and chronic inflammation; It may be a cardiovascular disease such as hypertension or arteriosclerosis or sepsis.
- the cancer may be overexpressing VEGFR2 / KDR, and may be solid cancer or hematological cancer, but is not limited thereto, squamous cell carcinoma, small cell lung cancer, non-small cell lung cancer, adenocarcinoma of the lung, squamous cell carcinoma of the lung, peritoneal cancer, skin cancer , skin or intraocular melanoma, rectal cancer, perianal cancer, esophageal cancer, small intestine cancer, endocrine cancer, parathyroid cancer, adrenal cancer, soft tissue sarcoma, urethral cancer, chronic or acute leukemia, lymphocytic lymphoma, hepatocellular cancer, gastrointestinal cancer, pancreatic cancer, Glioboma, cervical cancer, ovarian cancer, liver cancer, bladder cancer, liver tumor, breast cancer, colon cancer, colorectal cancer, endometrial or uterine cancer, salivary gland cancer, kidney cancer, liver cancer, prostate cancer, vulvar cancer, thyroid cancer, liver cancer
- the antibodies of the present invention can be used in combination with other antibodies or biologically active agents or substances for various purposes. From this point of view, the present invention relates to a composition for concomitant administration with other angiogenic disease therapeutics comprising the antibody or antigen-binding fragment thereof.
- the other angiogenic disease treatment agents include anti-angiogenic drugs, anti-inflammatory drugs and/or anti-cancer drugs. Through this, it is possible to overcome each other's resistance and improve efficacy.
- the anti-VEGFR2/KDR antibody or antigen-binding fragment thereof and other angiogenic disease therapeutics may be administered sequentially or simultaneously.
- a composition comprising an anti-VEGFR2 / KDR antibody or antigen-binding fragment thereof as an active ingredient is administered to the subject, or the composition
- an anti-angiogenic drug, anti-inflammatory drug and/or anti-cancer drug is administered to the subject.
- the composition may be administered to a subject simultaneously with an anti-angiogenic drug, an anti-inflammatory drug, and/or an anti-cancer drug.
- the CDR sequence of 6A6 was identified through Kabat numbering and IMGT programs, and cloning was performed by transplanting it into the Hunam germline VH3/VK1.
- the heavy chain CDR transplant sequence was indicated in [ Figure 1]
- the light chain CDR transplant sequence was indicated in [ Figure 2].
- Biopanning was performed using each variant scFv phage library.
- Antigens KDR1-3 domian-Fc
- PBST PBST
- BSA blocking buffer 200 ml
- the supernatant was discarded, and the precipitate was spread on a large square plate (CM 34 ⁇ g/ml + 1% Glucose) and incubated overnight at 37° C.
- the remaining 100ml of the output titer was diluted 1/10, 1/100, and 1/1000, spread on a CM plate, and overnighted at 37°C.
- the colonies grown on the square plate were added with 50ml of 2x YT medium, scraped using a loop, and centrifuged at 6000 rpm for 10 minutes, discarding the supernatant, and using the primary panning stock for the precipitate.
- helper phage M13KO7 mutant was added to the cells in an amount of 20 times. A helper phage was added and infected at 37° C. for 30 minutes, followed by centrifugation at 6000 rpm for 10 min.
- the supernatant was discarded, and the cells were replaced with 100 ml of 2xYT medium (CM 34 ⁇ g/ml + Kan. 70 ⁇ g/ml + 1 mM IPTG + 5 mM MgCl2), followed by overnight at 200 rpm and 30° C. The next day, the grown cells were centrifuged at 7000 rpm for 10 minutes and centrifuged again in the same manner. The collected supernatant was precipitated on ice for 1 hour with 1/5 (v/v) 20% PEG/2.5m NaCl of the supernatant. After precipitating, centrifugation was performed at 9000 rpm for 1 hour.
- 2xYT medium CM 34 ⁇ g/ml + Kan. 70 ⁇ g/ml + 1 mM IPTG + 5 mM MgCl2
- the dissociation rate constant K dis of scFv was measured as a quantitative evaluation index of the ability to maintain binding.
- the binding ability of the selected antibody to the antigen was measured using Octet (Fortebio). To this end, the KDR1-3 domains were immobilized on a biosensor, and then a candidate antibody expressed in scFv form was added and bound, and then the dissociation rate constant was measured. Amino acid sequences (Tables 2 and 3) and dissociation rate constant measurement results (Table 1) for the selected five optimized clones are shown. The indicated CDR sequences are sequences analyzed through the IMGT database.
- Conversion of the selected scFv phage into an IgG form was performed using molecular biology techniques. Phagemid was extracted from the selected E. Coli clone, and the variable region was amplified using PCR technique. The amplified heavy chain variable region was inserted into an expression vector (Invivogen, pfusess-hchg1) containing the heavy chain constant region, and the amplified light chain variable region was inserted into an expression vector (Invivogen, pfuse2ss-hclk) containing the light chain constant region, DNA cloning in IgG form was completed.
- Phagemid was extracted from the selected E. Coli clone, and the variable region was amplified using PCR technique.
- the amplified heavy chain variable region was inserted into an expression vector (Invivogen, pfusess-hchg1) containing the heavy chain constant region, and the amplified light chain variable region was inserted into an expression vector (Invivogen, pfuse2ss-hclk
- Expi293F expression system kit (Thermo Fisher Scientific, US) was used. Expi293 cells included in the kit were cultured in suspension on a 125 rpm orbital shaker in a 37°C, 5% CO 2 environment using a dedicated medium. It was subcultured to 3 X 10 5 cells/ml every 3 days, and used after adjusting the number of cells to 3 X 10 6 cells/ml when introducing an expression vector.
- Expifectamine a dedicated reagent, was used for gene introduction, and a Lipid-DNA complex containing 1 mg of expression vector DNA and 2.7 ⁇ l of Expifectamine per 1 ml of cell suspension was prepared, added to the cell suspension, and 16-18 hours after introduction, the enhancer ( Enhancer) 1/2 was added to induce expression. After culturing for 3-4 days under the same conditions, the supernatant containing IgG was collected by centrifugation.
- the obtained supernatant was injected into a Protein A column (GE Healthcare) to purify IgG through affinity chromatography. After equilibrating the column with 20 mM Tris-HCl, 50 mM NaCl, 5 mM EDTA (pH 7.0), supernatant was injected, 50 mM Tris-HCl, 500 mM NaCl, 5 mM EDTA, 0.2% polysorbate 20 (pH 7.0) solution. After washing with 50 mM NaCl, eluted with 0.1 M glycine-HCl (pH 3.5) and neutralized with 1 M Tris.
- the eluted protein was subjected to dialysis using a MWCO 10,000 spectra/por dialysis membrane (Spectrum Labs, US) to replace the solvent with PBS. Thereafter, the mixture was concentrated to the required concentration using Vivaspin (Satorius, DE) and stored at -80 ° C after dispensing.
- the binding ability of the selected antibodies to the KDR1-3 domains was measured using the Octet system (Fortebio Inc. US). To this end, the anti-VEGFR2 / KDR antibody was immobilized on a biosensor, and the binding kinetics of each concentration of human KDR1-3 were measured to calculate the association rate constant (ka), dissociation rate constant (k dis ) and association constant (KD). (Table 4).
- HUVEC cells purchased from Lonza (cat# C2519A) were used, and VascuLife VEGF-Mv medium complete kit (Lifeline cell technology, cat# LCT-LL-0005) medium was used on a plate coated with 2% gelatin.
- culture Culture is performed in a 37 °C, 5% Co2 incubator. Cells within passage 10 were used for the assay, and 1X10 4 cells were used per well in a 96-well plate with M199 medium (Gibco, cat# 11043-023) containing 0.5% heat inactivated FBS.
- VEGF165 R&D, cat#293-VE
- VEGF165 was treated at a concentration of 30 ng/mL per well.
- viability was measured. Viability was quantified by ATP in living cells using promega's CellTier Glo-Luminescent Cell viability Assay Kit (cat no. G7571) (FIG. 3).
- the selected antibody inhibited the efficacy by VEGF165 by concentration.
- HUVEC cells were used, and HUVEC cells purchased from Lonza (cat# C2519A) were used. After culturing cells using VascuLife VEGF-Mv medium complete kit (Lifeline cell technology, cat# LCT-LL-0005) medium, put 8x10 5 per well in a 6-well plate and grow overnight in an incubator supplied with carbon dioxide at 37°C. After treating the above cells with antibody at a concentration of 10ug/mL for 20 minutes, VEGF165 (R&D, cat#293-VE) was treated for 10 minutes. At this time, wells without antibody and containing only VEGF165 protein were included and used as a reference value for analysis of the signal suppression effect.
- VascuLife VEGF-Mv medium complete kit Lifeline cell technology, cat# LCT-LL-0005
- VEGF165 R&D, cat#293-VE
- HUVEC cells are washed twice with PBS, and then reacted on ice for 20 minutes with lysis buffer (Thermo Scientific, RIPA buffer & phosphatase inhibitors) added to obtain cell extract. Then, after centrifugation at 13000 rpm and 4°C, only the supernatant is obtained. After quantification using the BCA protein quantification method, the lysate is loaded on a 10% SDS-PAGE gel and electrophoresed. After transfer using a nitrocellulose membrane (Bio-Rad), dilute 5% skim milk in 0.1% Tween20 TBST buffer and proceed with blocking for 1 hour at room temperature.
- lysis buffer Thermo Scientific, RIPA buffer & phosphatase inhibitors
- the anti-VEGFR2/KDR antibody or antigen-binding fragment thereof according to the present invention exhibits improved binding ability to VEGFR2/KDR, and can be usefully used for preventing or treating cancer/tumor or angiogenesis inhibitor-related diseases.
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Abstract
Description
Claims (15)
- 서열번호 1, 7, 13, 19 및 25로 구성된 군에서 선택되는 서열을 포함하는 중쇄 CDR1,서열번호 2, 8, 14, 20 및 26으로 구성된 군에서 선택되는 서열을 포함하는 중쇄 CDR2, 및서열번호 3, 9, 15, 21 및 27로 구성된 군에서 선택되는 서열을 포함하는 중쇄 CDR3를 포함하는 중쇄 가변영역, 및서열번호 4, 10, 16, 22, 및 28로 구성된 군에서 선택되는 서열을 포함하는 경쇄 CDR1,서열번호 5, 11, 17, 23 및 29으로 구성된 군에서 선택되는 서열을 포함하는 경쇄 CDR2, 및서열번호 6, 12, 18, 24 및 30로 구성된 군에서 선택되는 서열을 포함하는 경쇄 CDR3을 포함하는 경쇄 가변영역을 포함하는, VEGFR2/KDR에 결합하는 항체 또는 이의 항원 결합단편.
- 제1항에 있어서,서열번호 1의 중쇄 CDR1, 서열번호 2의 중쇄 CDR2 및 서열번호 3의 중쇄 CDR3을 포함하는 중쇄 가변영역, 서열번호 4의 경쇄 CDR1, 서열번호 5의 경쇄 CDR2, 및 서열번호 6의 경쇄 CDR3를 포함하는 경쇄 가변영역,서열번호 7의 중쇄 CDR1, 서열번호 8의 중쇄 CDR2 및 서열번호 9의 중쇄 CDR3을 포함하는 중쇄 가변영역, 서열번호 10의 경쇄 CDR1, 서열번호 11의 경쇄 CDR2, 및 서열번호 12의 경쇄 CDR3를 포함하는 경쇄 가변영역,서열번호 13의 중쇄 CDR1, 서열번호 14의 중쇄 CDR2 및 서열번호 15의 중쇄 CDR3을 포함하는 중쇄 가변영역, 서열번호 16의 경쇄 CDR1, 서열번호 17의 경쇄 CDR2, 및 서열번호 18의 경쇄 CDR3를 포함하는 경쇄 가변영역,서열번호 19의 중쇄 CDR1, 서열번호 20의 중쇄 CDR2 및 서열번호 21의 중쇄 CDR3을 포함하는 중쇄 가변영역, 서열번호 22의 경쇄 CDR1, 서열번호 23의 경쇄 CDR2, 및 서열번호 24의 경쇄 CDR3를 포함하는 경쇄 가변영역, 또는서열번호 25의 중쇄 CDR1, 서열번호 26의 중쇄 CDR2 및 서열번호 27의 중쇄 CDR3을 포함하는 중쇄 가변영역, 서열번호 28의 경쇄 CDR1, 서열번호 29의 경쇄 CDR2, 및 서열번호 30의 경쇄 CDR3를 포함하는 경쇄 가변영역을 포함하는, 항체 또는 이의 항원 결합단편.
- 제1항에 있어서, 서열번호 32, 36, 40, 44, 48로 구성된 군에서 선택되는 중쇄 가변영역을 포함하는 항체 또는 이의 항원 결합단편.
- 제1항에 있어서, 서열번호 34, 38, 42, 46, 50으로 구성된 군에서 선택되는 경쇄 가변영역을 포함하는 항체 또는 이의 항원 결합단편.
- 제1항에 있어서, 서열번호 32, 36, 40, 44, 48로 구성된 군에서 선택되는 서열과 80% 이상의 상동성을 가지는 서열을 포함하는 중쇄 가변영역을 포함하는 VEGFR2/KDR에 결합하는 항체 또는 이의 항원 결합단편.
- 제1항에 있어서, 서열번호 34, 38, 42, 46, 50으로 구성된 군에서 선택되는 선택되는 서열과 80% 이상의 상동성을 가지는 서열을 포함하는 경쇄 가변영역을 포함하는 VEGFR2/KDR에 결합하는 항체 또는 이의 항원 결합단편.
- 제1항에 있어서, 서열번호 32, 36, 40, 44, 48로 구성된 군에서 선택되는 서열과 80% 이상의 상동성을 가지는 서열을 포함하는 중쇄 가변영역 및 서열번호 34, 38, 42, 46, 50으로 구성된 군에서 선택되는 선택되는 서열과 80% 이상의 상동성을 가지는 서열을 포함하는 경쇄 가변영역을 포함하는 VEGFR2/KDR에 결합하는 항체 또는 이의 항원 결합단편.
- 제1항 내지 제7항 중 어느 한 항의 항체 또는 이의 항원 결합단편을 코딩하는 핵산.
- 제8항의 핵산을 포함하는 발현벡터.
- 제9항의 발현벡터를 포함하는, 형질전환 세포.
- 다음 단계를 포함하는 VEGFR2/KDR에 결합하는 항체 또는 이의 항원 결합 단편의 제조방법:(a) 제10항의 세포를 배양하는 단계; 및(b) 상기 배양된 세포에서 항체 또는 이의 항원 결합 단편을 회수하는 단계.
- 제1항 내지 제7항 중 어느 한 항의 항체 또는 이의 항원 결합 단편을 유효성분으로 포함하는 혈관신생 질환의 예방 또는 치료용 조성물.
- 제1항 내지 제7항 중 어느 한 항의 항체 또는 이의 항원 결합 단편을 유효성분으로 포함하는 혈관신생 질환의 진단용 조성물.
- 제1항 내지 제7항 중 어느 한 항의 항체 또는 이의 항원 결합 단편을 유효성분으로 포함하는 종양 또는 암의 예방 또는 치료용 조성물.
- 제1항 내지 제7항 중 어느 한 항의 항체 또는 이의 항원 결합 단편을 포함하는 다른 치료제와의 병용투여용 조성물.
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