WO2014087248A2 - Anti-cd47 antibodies and methods of use thereof - Google Patents
Anti-cd47 antibodies and methods of use thereof Download PDFInfo
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- WO2014087248A2 WO2014087248A2 PCT/IB2013/003164 IB2013003164W WO2014087248A2 WO 2014087248 A2 WO2014087248 A2 WO 2014087248A2 IB 2013003164 W IB2013003164 W IB 2013003164W WO 2014087248 A2 WO2014087248 A2 WO 2014087248A2
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/46—Hybrid immunoglobulins
- C07K16/468—Immunoglobulins having two or more different antigen binding sites, e.g. multifunctional antibodies
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
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- 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
- C07K16/2803—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily
-
- 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
- C07K16/2896—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against molecules with a "CD"-designation, not provided for elsewhere
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/46—Hybrid immunoglobulins
- C07K16/461—Igs containing Ig-regions, -domains or -residues form different species
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- 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
- A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
- C07K2317/31—Immunoglobulins specific features characterized by aspects of specificity or valency multispecific
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
- C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
- C07K2317/565—Complementarity determining region [CDR]
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/60—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments
- C07K2317/62—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments comprising only variable region components
- C07K2317/622—Single chain antibody (scFv)
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
- C07K2317/76—Antagonist effect on antigen, e.g. neutralization or inhibition of binding
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/90—Immunoglobulins specific features characterized by (pharmaco)kinetic aspects or by stability of the immunoglobulin
- C07K2317/92—Affinity (KD), association rate (Ka), dissociation rate (Kd) or EC50 value
Definitions
- the invention relates to monoclonal and/or monovalent antibodies that bind
- the invention relates to monoclonal and/or monovalent antibodies that bind CD 19.
- the invention also relates to novel bispecific monoclonal antibodies carrying a different specificity for each binding site of the immunoglobulin molecule, where one of the binding sites is specific for CD47.
- the invention also relates to novel bispecific monoclonal antibodies carrying a different specificity for each binding site of the immunoglobulin molecule, where one of the binding sites is specific for CD 19.
- CD47 or Integrin- Associated-Protein is a ubiquitous 50 kDa transmembrane glycoprotein with multiple functions in cell-cell communication. It interacts with multiple ligands, such as integrins, SIRPa (Signal Regulatory Protein alpha), SIRPy and thrombospondins (Oldenborg, P. A., CD47: A Cell Surface Glycoprotein Which Regulates Multiple Functions of Hematopoietic Cells in Health and Disease, ISRN Hematol. 2013; 2013:614619; Soto-Pantoja DR, et al, Therapeutic opportunities for targeting the ubiquitous cell surface receptor CD47 (2012), Expert Opin Ther Targets.
- CD47 functions as a marker of self, transmitting an inhibitory "don't kill me” signal through binding to SIRPa expressed by myeloid cells, such as macrophages, neutrophils, and dendritic cells.
- SIRPa myeloid cells
- the role of widespread expression of CD47 in the physiological situation is therefore to protect healthy cells against the elimination by the innate immune system (Oldenborg PA, et al, CD47- Signal Regulatory Protein a (Sirpa) Regulates Fey and Complement Receptor-Mediated Phagocytosis, J Exp Med.
- CD47 which efficiently helps them to escape immune surveillance and killing by innate immune cells.
- CD47 is an adverse prognostic factor and therapeutic antibody target on human acute myeloid leukemia stem cells, Cell. 2009 Jul 23;138(2):286- 99; S. Jaiswal et al, CD47 is upregulated on circulating hematopoietic stem cells and leukemia cells to avoid phagocytosis., Cell. 2009 Jul 23;138(2):271-85).
- CD47 expression is upregulated in most human cancers (e.g., NHL, AML, breast, colon, glioblastoma, glioma, ovarian, bladder and prostate cancers) and increased levels of CD47 expression clearly correlate with aggressive disease and poor survival.
- CD47-signal regulatory protein alpha (SIRPa) interaction is a therapeutic target for human solid tumors, Proc Natl Acad Sci U S A. 2012 Apr 24;109(17):6662-7; Chao MP, et al, Therapeutic antibody targeting of CD47 eliminates human acute lymphoblastic leukemia., Cancer Res. 2011 Feb 15;71(4): 1374-84).
- the invention provides monoclonal antibodies that bind CD47. These antibodies are collectively referred to herein as anti-CD47 monoclonal antibodies or anti- CD47 mAbs.
- the monoclonal antibodies are specific for at least human CD47.
- the monoclonal antibodies that recognize human CD47 are also cross- reactive for at least one other non-human CD47 protein, such as, by way of non-limiting example, non-human primate CD47, e.g., cynomolgus monkey CD47, and/or rodent CD47.
- these anti-CD47 monoclonal antibodies inhibit the interaction between CD47 and signal-regulatory protein alpha (SIRPa).
- SIRPa signal-regulatory protein alpha
- these anti-CD47 monoclonal antibodies inhibit the interaction between human CD47 and human SIRPa.
- the invention also include antibodies that bind to the same epitope as an anti-CD47 monoclonal antibody disclosed herein and inhibits the interaction between CD47 and SIRPa, e.g., between human CD47 and human SIRPa.
- the invention also provides monovalent antibodies and/or bispecific antibodies that include at least a first arm that is specific for CD47.
- the monovalent antibodies and/or bispecific antibodies are specific for at least human CD47.
- the monovalent antibodies and/or bispecific antibodies that recognize human CD47 are also cross-reactive for at least one other non-human CD47 protein, such as, by way of non-limiting example, non-human primate CD47, e.g., cynomolgus monkey CD47, and/or rodent CD47.
- these anti-CD47 monovalent antibodies and/or anit-CD47 bispecific antibodies inhibit the interaction between CD47 and signal- regulatory protein alpha (SIRPa).
- these anti-CD47 monovalent antibodies and/or anit-CD47 bispecific antibodies inhibit the interaction between human CD47 and human SIRPa.
- the invention also include antibodies that bind to the same epitope as an anti-CD47 monovalent and/or an anti-CD47 bispecific antibody disclosed herein and inhibits the interaction between CD47 and SIRPa, e.g., between human CD47 and human SIRPa.
- the invention provides bispecific antibodies that recognize CD47 and a second target.
- the invention allows for the identification, production and purification of bispecific antibodies that are undistinguishable in sequence from standard antibodies and where one of the binding sites is specific for CD47 and the second binding site is specific for another target, for example a tumor-associated antigen (TAA).
- TAA tumor-associated antigen
- the TAA is an antigen that is expressed on the cell surface of a cancer cell.
- the cancer cell is selected from a lung cancer cell, a bronchial cancer cell, a prostate cancer cell, a breast cancer cell, a colorectal cancer cell, a pancreatic cancer cell, an ovarian, a leukemia cancer cell, a lymphoma cancer cell, an esophageal cancer cell, a liver cancer cell, a urinary and/or bladder cancer cell, a renal cancer cell, an oral cavity cancer cell, a pharyngeal cancer cell, a uterine cancer cell, and/or a melanoma cancer cell.
- suitable TAA include CD20, HER2, HER3, EGFR, IGF1R, c-Met, PDGFR1, CD40, CD40L, CD30, CS1, CD70, glypican, mesothelin, PSMA, PSCA, MUC1, CA125, CEA, FRA, EpCAM, DR5, HGFR1, and/or 5T4.
- CD47 Cluster of Differentiation 47
- CD47 interacts with SIRPa, which is expressed on phagocytic cells.
- CD47 down-regulates phagocytic activity.
- CD47 inhibits dendritic cell (DC) maturation and activation.
- DC dendritic cell
- CD47 has also been implicated in processes such as, for example, apoptosis, survival, proliferation, adhesion, migration, and regulation of angiogenesis, blood pressure, tissue perfusion, and/or platelet homeostasis.
- CD47 has also been implicated in cancer.
- CD47 is overexpressed in various hematological and solid malignancies.
- CD47 is a documented cancer stem cell/tumor initiating cell marker. It is thought that CD47 overexpression may help tumor cells to escape immune surveillance and killing by innate immune cells.
- High levels of CD47 are also associated with poor clinical outcome in cancers such as, for example, leukemias, lymphomas, breast cancer, colon cancer, ovarian cancer, bladder cancer, prostate cancer, and/or glioma.
- targeting CD47 would be useful in treating, delaying the progression of, or otherwise ameliorating a symptom of cancer.
- CD47 is ubiquitously expressed, it is a difficult target for a monoclonal antibody (mAb). Nevertheless, the antibodies that are specific for CD47 described herein are useful as monospecific antibodies and can be used for therapeutic intervention or as a research or diagnostic reagent.
- mAb monoclonal antibody
- Monospecific antibodies of the invention that bind CD47, as well as fragments of these monospecific antibodies that are immunologically active and still bind CD47 include the exemplary antibodies described herein, e.g., the 5 A3 antibody, the 5A3M4 antibody, the 5A3M3 antibody, the 5A3M5 antibody, the KE8 antibody, the KE8- P6H5 antibody (also referred to herein as KE8H5), the KE8-P3B2 antibody (also referred to herein as KE8B2), the KE8-P2A2 antibody (also referred to herein as KE8A25), the KE8F2 antibody, the KE8G2 antibody, the KE84G9 antibody, the KE81G9 antibody, the KE81A3 antibody, the KE8E8 antibody, the KE8G6 antibody, the KE8H3 antibody, the KE8C7 antibody, the KE8A4 antibody, the KE8A8 antibody, the KE8G11 antibody, the
- the antibodies of the invention that bind CD47 and fragments thereof serve to modulate, block, inhibit, reduce, antagonize, neutralize or otherwise interfere with the functional activity of CD47.
- Functional activities of CD47 include, by way of non-limiting example, interaction with SIRPa.
- the antibodies are considered to completely modulate, block, inhibit, reduce, antagonize, neutralize or otherwise interfere with the CD47-SIRPa interaction when the level of CD47-SIRPa interaction in the presence of the antibody is decreased by at least 95%, e.g., by 96%, 97%, 98%, 99% or 100% as compared to the level of CD47-SIRPa interaction in the absence of binding with an antibody described herein.
- the antibodies are considered to partially modulate, block, inhibit, reduce, antagonize, neutralize or otherwise interfere with the CD47-SIRPa interaction when the level of CD47-
- SIRPa interaction in the presence of the antibody is decreased by less than 95%, e.g., 10%>,
- the invention also provides bispecific antibodies in which at least one binding site is specific for CD47.
- the bispecific antibodies of the invention target CD47 and a second antigen, e.g., a tumor-associated antigen (TAA).
- TAA tumor-associated antigen
- the bispecific antibody includes a functional Fc portion.
- the TAA-binding arm of the bispecific antibody targets the CD47 arm to the tumor cell or cancer stem cell.
- the CD47 arm blocks, inhibits or otherwise reduces the interaction between CD47 and SIRPa, thereby conveying an "eat me” signal to the phagocyte.
- the TAA-binding arm of the bispecific antibody includes an anti-CD 19 antibody sequence or antigen-binding fragment thereof.
- the bispecific antibody exhibits a "balanced" affinity for each of the two targets. In other embodiments, the bispecific antibody exhibits an "unbalanced" affinity for each of the two targets. For example, in an anti-CD47/CD19 bispecific antibody, the affinity of the anti-CD 19 arm is increased. For example, in an anti- CD47/CD19 bispecific antibody, the affinity of the anti-CD47 arm is decreased. For example, in an anti-CD47/CD19 bispecific antibody, the affinity of the anti-CD 19 arm is increased and the affinity of the anti-CD47 arm is decreased.
- These unbalanced affinity bispecific antibodies are useful, for example, to improve selectivity for a target cell or group of target cells.
- the affinity of the anti-CD 19 arm is increased by at least 100 fold following affinity maturation. In some embodiments, the affinity of the anti- CD47 arm is decreased by at least 2 fold following affinity dematuration. For example, in some embodiments, the anti-CD47 arm exhibits an affinity for CD47 that is between about 2 fold and 100 fold lower following affinity dematuration.
- the bispecific antibodies of the invention that include at least one anti-CD47 arm serve to modulate, block, inhibit, reduce, antagonize, neutralize or otherwise interfere with the functional activity of CD47.
- Functional activities of CD47 include, by way of non- limiting example, interaction with SIRPa.
- the bispecific antibodies are considered to completely modulate, block, inhibit, reduce, antagonize, neutralize or otherwise interfere with the CD47-SIRPa interaction when the level of CD47-SIRPa interaction in the presence of the bispecific antibody is decreased by at least 95%, e.g., by 96%, 97%, 98%, 99% or 100% as compared to the level of CD47-SIRPa interaction in the absence of binding with a bispecific antibody described herein.
- the bispecific antibodies are considered to partially modulate, block, inhibit, reduce, antagonize, neutralize or otherwise interfere with the
- CD47-SIRPa interaction when the level of CD47-SIRPa interaction in the presence of the bispecific antibody is decreased by less than 95%, e.g., 10%, 20%, 25%, 30%, 40%, 50%, 60%, 75%, 80%, 85% or 90% as compared to the level of CD47-SIRPa interaction in the absence of binding with a bispecific antibody described herein.
- anti-CD47 arms of the bispecific antibodies of the invention are useful with a number of arms that bind other antigens, e.g., TAAs.
- Exemplary anti-CD47 arms, anti-CD47 monovalent antibodies and/or bispecific antibodies of the invention include the antibodies referred to herein as the 5A3 antibody, the 5A3M4 antibody, the 5A3M3 antibody, the 5A3M5 antibody, the KE8 antibody, the KE8-P6H5 antibody (also referred to herein as KE8H5), the KE8-P3B2 antibody (also referred to herein as KE8B2), the KE8- P2A2 antibody (also referred to herein as KE8A25), the KE8F2 antibody, the KE8G2 antibody, the KE84G9 antibody, the KE81G9 antibody, the KE81A3 antibody, the KE8E8 antibody, the KE8G6 antibody, the KE8H3 antibody, the KE8C7
- the invention provides isolated bispecific antibodies having a first arm that includes a first amino acid sequence that binds CD47 and a second arm that includes a second amino acid sequence that does not bind CD47, wherein the bispecific antibody inhibits interaction between CD47 and signal-regulatory protein alpha (SIRP ).
- SIRP signal-regulatory protein alpha
- the second amino acid sequence binds a tumor associated antigen (TAA).
- TAA tumor associated antigen
- the bispecific antibody inhibits interaction between human CD47 and human SIRPa.
- the bispecific antibody inhibits interaction between human CD47 and human SIRPa at a level that is at least ten times more potent than a corresponding level of inhibition of human CD47/human SIRPa interaction exhibited by a monovalent anti-CD47 antibody that includes the first amino acid sequence that binds CD47 and a second amino acid sequence that does not bind a human protein.
- the bispecific antibody inhibits interaction between human CD47 and human SIRPa at a level that is at least 100 times more potent than a corresponding level of inhibition of human CD47/human SIRPa interaction exhibited by a monovalent anti-CD47 antibody that includes the first amino acid sequence that binds CD47 and a second amino acid sequence that does not bind a human protein.
- the bispecific antibody inhibits interaction between human CD47 and human SIRPa at a level that is at least 1,000 times more potent than a corresponding level of inhibition of human CD47/human SIRPa interaction exhibited by a monovalent anti-CD47 antibody that includes the first amino acid sequence that binds CD47 and a second amino acid sequence that does not bind a human protein.
- the bispecific antibody includes a first arm that inhibits the interaction between human CD47 at the surface of cells and soluble human SIRPa with an IC50 greater than 5 nM in the assay described in Example 4 and in which the monovalent antibody 5A3M3 has an IC50 of approximately 13 nM.
- the bispecific antibody includes a first arm that is recovered at more than 80% after incubation at 37°C for 30 minutes in human whole blood at a concentration of 10 ⁇ g/ml as described in Example 15.
- the bispecific antibody inhibits interaction between human CD47 and human SIRPa at a level that is at least ten times, at least 100 times or at least 1,000 times more potent than a corresponding level of inhibition of human CD47/human SIRPa interaction exhibited by a monovalent anti-CD47 antibody that includes the first amino acid sequence that binds CD47 and a second amino acid sequence that does not bind a human protein, and includes a first arm that inhibits the interaction between human CD47 at the surface of cells and soluble human SIRPa with an IC50 greater than 5 nM in the assay described in Example 4 and in which the monovalent antibody 5A3M3 has an IC50 of approximately 13 nM.
- the bispecific antibody inhibits interaction between human CD47 and human SIRPa at a level that is at least ten times, at least 100 times or at least 1,000 times more potent than a corresponding level of inhibition of human
- CD47/human SIRPa interaction exhibited by a monovalent anti-CD47 antibody that includes the first amino acid sequence that binds CD47 and a second amino acid sequence that does not bind a human protein, and includes a first arm that is recovered at more than 80% after incubation at 37°C for 30 minutes in human whole blood at a concentration of 10 ⁇ g/ml as described in Example 15.
- the TAA is CD 19.
- the second amino acid sequence does not bind a human protein.
- the first amino acid sequence includes a variable heavy chain complementarity determining region 1 (CDRH1) amino acid sequence of SEQ ID NO: 225, a variable heavy chain complementarity determining region 2 (CDRH2) amino acid sequence of SEQ ID NO: 226, a variable heavy chain complementarity determining region 3 (CDRH3) amino acid sequence of SEQ ID NO: 227, a variable light chain complementarity determining region 1 (CDRL1) amino acid sequence selected from SEQ ID NO: 228-241 and 262-272, a variable light chain complementarity determining region 2 (CDRL2) amino acid sequence selected from 242-245 and 273-280, and a variable light chain complementarity determining region 3 (CDRH3) amino acid sequence selected from 246-261 and 281.
- CDRH1 variable heavy chain complementarity determining region 1
- CDRL1 variable light chain complementarity determining region 1
- CDRL2 variable light chain complementarity determining region 2
- CDRL2 variable light chain complementarity determining region 2 amino acid sequence selected from 242-245
- the first amino acid sequence includes a variable heavy chain amino acid sequence of SEQ ID NO: 114 and a variable light chain amino acid sequence selected from SEQ ID NO: 116, 118, 120, 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 142, 144, 146, 148, 150, 152, 154, 156, 158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198, 200, 202, 204 and 206.
- the bispecific antibody includes two copies of a single heavy chain polypeptide and a first light chain and a second light chain, wherein the first and second light chains are different.
- At least a portion of the first light chain is of the
- the first light chain includes at least a Kappa constant region. In some embodiments, the first light chain further includes a Kappa variable region. In some embodiments, the first light chain further includes a Lambda variable region. In some embodiments, the second light chain includes at least a Lambda constant region. In some embodiments, the second light chain further includes a Lambda variable region. In some embodiments, the second light chain further includes a Kappa variable region. In some embodiments, the first light chain includes a Kappa constant region and a Kappa variable region, and wherein the second light chain includes a Lambda constant region and a Lambda variable region.
- the constant and variable framework region sequences are human.
- the invention also provides bispecific antibodies and/or monovalent antibodies that include at least a first arm that inhibits the interaction between human CD47 at the surface of cells and soluble human SIRPa with an IC50 greater than 5 nM in the assay described in Example 4 and in which the antibody 5A3M3 has an IC50 of approximately 13 nM.
- the invention also provides bispecific antibodies and/or monovalent antibodies that include at least a first arm that is recovered at more than 80% after incubation at 37°C for 30 minutes in human whole blood at a concentration of 10 ⁇ g/ml as described in Example 15.
- the bispecific antibody and/or monovalent antibody inhibits interaction between CD47 and signal-regulatory protein alpha (SIRPa).
- SIRPa signal-regulatory protein alpha
- the bispecific antibody and/or monovalent antibody inhibits interaction between human CD47 and human SIRPa.
- the invention also provides isolated bispecific antibodies having a first arm that includes a first amino acid sequence that binds CD47 and a second arm that includes a second amino acid sequence that binds CD 19, wherein the bispecific antibody inhibits interaction between CD47 and signal-regulatory protein alpha (SIRPa).
- SIRPa signal-regulatory protein alpha
- the bispecific antibody inhibits interaction between human CD47 and human SIRPa. In some embodiments, the bispecific antibody inhibits interaction between human CD47 and human SIRPa at a level that is selected from the group consisting of at least ten times more potent, at least 100 times more potent and at least 1,000 times more potent than a corresponding level of inhibition of human CD47/human SIRPa interaction exhibited by a monovalent anti-CD47 antibody that includes the first amino acid sequence that binds CD47 and a second amino acid sequence that does not bind a human protein.
- the first amino acid sequence includes a variable heavy chain complementarity determining region 1 (CDRH1) amino acid sequence of SEQ
- variable heavy chain complementarity determining region 2 (CDRH2) amino acid sequence of SEQ ID NO: 226, a variable heavy chain complementarity determining region 3 (CDRH3) amino acid sequence of SEQ ID NO: 227, a variable light chain complementarity determining region 1 (CDRL1) amino acid sequence selected from SEQ ID NO: 228-241 and 262-272, a variable light chain complementarity determining region 2 (CDRL2) amino acid sequence selected from 242-245 and 273-280, and a variable light chain complementarity determining region 3 (CDRH3) amino acid sequence selected from 246-261 and 281.
- CDRH2 variable heavy chain complementarity determining region 2
- CDRH3 variable heavy chain complementarity determining region 3
- the first amino acid sequence includes a variable heavy chain amino acid sequence of SEQ ID NO: 114 and a variable light chain amino acid sequence selected from SEQ ID NO: 116, 118, 120, 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 142, 144, 146, 148, 150, 152, 154, 156, 158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198, 200, 202, 204 and 206.
- the bispecific antibody includes two copies of a single heavy chain polypeptide and a first light chain and a second light chain, wherein the first and second light chains are different.
- At least a portion of the first light chain is of the
- the first light chain includes at least a Kappa constant region. In some embodiments, the first light chain further includes a Kappa variable region. In some embodiments, the first light chain further includes a Lambda variable region. In some embodiments, the second light chain includes at least a Lambda constant region. In some embodiments, the second light chain further includes a Lambda variable region. In some embodiments, the second light chain further includes a Kappa variable region. In some embodiments, the first light chain includes a Kappa constant region and a Kappa variable region, and wherein the second light chain includes a Lambda constant region and a Lambda variable region.
- the constant and variable framework region sequences are human.
- the invention also provides monovalent antibodies that bind CD47. These antibodies are collectively referred to herein as anti-CD47 monovalent antibodies or anti-
- the monovalent antibodies of the invention include one arm that specific recognizes CD47, and a second arm referred to herein as a dummy arm.
- the dummy arm includes an amino acid sequence that does not bind or otherwise cross-react with a human protein.
- the dummy arm includes an amino acid sequence that does not bind or otherwise cross-react with a human protein that is found in whole blood.
- human proteins found in the blood are a proxy that represent all, or substantially all, antigens present in system circulation.
- the dummy arm includes an amino acid sequence that does not bind or otherwise cross-react with a human protein that is found in solid tissue.
- the monovalent antibodies are specific for at least human CD47.
- the monovalent antibodies that recognize human CD47 are also cross- reactive for at least one other non-human CD47 protein, such as, by way of non-limiting example, non-human primate CD47, e.g., cynomolgus monkey CD47, and/or rodent CD47.
- the anti-CD47 arms of the monovalent antibodies of the invention are useful with any dummy arm.
- Exemplary anti-CD47 arms of the monovalent antibodies of the invention include the antibodies referred to herein as the 5A3 antibody, the 5A3M4 antibody, the 5A3M3 antibody, the 5A3M5 antibody, the KE8 antibody, the KE8-P6H5 antibody (also referred to herein as KE8H5), the KE8-P3B2 antibody (also referred to herein as KE8B2), the KE8-P2A2 antibody (also referred to herein as KE8A25), the KE8F2 antibody, the KE8G2 antibody, the KE84G9 antibody, the KE81G9 antibody, the KE81A3 antibody, the KE8E8 antibody, the KE8G6 antibody, the KE8H3 antibody, the KE8C7 antibody, the KE8A4 antibody, the KE8A8 antibody, the KE8G11 antibody,
- the monovalent antibody inhibits interaction between human CD47 and human SIRPa.
- the anti-CD47 arm of the monovalent antibody includes a first amino acid sequence that includes a variable heavy chain complementarity determining region 1 (CDRH1) amino acid sequence of SEQ ID NO: 225, a variable heavy chain complementarity determining region 2 (CDRH2) amino acid sequence of SEQ ID NO: 226, a variable heavy chain complementarity determining region 3 (CDRH3) amino acid sequence of SEQ ID NO: 227, a variable light chain complementarity determining region 1 (CDRL1) amino acid sequence selected from SEQ ID NO: 228-241 and 262-272, a variable light chain complementarity determining region 2 (CDRL2) amino acid sequence selected from 242-245 and 273-280, and a variable light chain complementarity determining region 3 (CDRH3) amino acid sequence selected from 246-261 and 281.
- CDRH1 variable heavy chain complementarity determining region 1
- CDRH2 variable heavy chain complementarity determining region 2
- CDRH3 variable heavy chain complementarity determining region 3
- the anti-CD47 arm of the monovalent antibody includes a first amino acid sequence that includes a variable heavy chain amino acid sequence of SEQ ID NO: 114 and a variable light chain amino acid sequence selected from SEQ ID NO: 116, 118, 120, 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 142, 144, 146, 148, 150, 152, 154, 156, 158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198, 200, 202, 204 and 206.
- the monovalent antibody includes two copies of a single heavy chain polypeptide and a first light chain and a second light chain, wherein the first and second light chains are different.
- At least a portion of the first light chain is of the
- the first light chain includes at least a Kappa constant region. In some embodiments, the first light chain further includes a Kappa variable region. In some embodiments, the first light chain further includes a Lambda variable region. In some embodiments, the second light chain includes at least a Lambda constant region. In some embodiments, the second light chain further includes a Lambda variable region. In some embodiments, the second light chain further includes a Kappa variable region. In some embodiments, the first light chain includes a Kappa constant region and a Kappa variable region, and wherein the second light chain includes a Lambda constant region and a Lambda variable region.
- the constant and variable framework region sequences are human.
- bispecific antibodies of the invention are generated using any methods known in the art such as, by way of non-limiting example, the use of cross-linked fragments, quadromas, and/or any of a variety of recombinant formats such as, by way of non-limiting examples, linked antibody fragments, forced heterodimers, and or recombinant formats based on single domains.
- Bispecific formats include but are not limited to bispecific IgG based on Fab arm exchange (Gramer et al, 2013 MAbs.
- fragment based bispecific formats such as tandem scFv (such asBiTEs) (Wolf E et al, 2005 Drug Discov. Today 10(18): 1237-44.); bispecific tetravalent antibodies (Portner LM et al, 2012 Cancer Immunol Immunother. 61(10): 1869-75.); dual affinity retargeting molecules (Moore PA et al, 2011 Blood.117(17):4542-51), diabodies (Kontermann RE et al, Nat Biotechnol. 1997 15(7):629-31).
- the bispecific antibodies carry a different specificity in each combining site and including two copies of a single heavy chain polypeptide and a first light chain and a second light chain, wherein the first and second light chains are different.
- At least a first portion of the first light chain is of the
- the first light chain includes at least a Kappa constant region. In some antibodies, the first light chain further includes a Kappa variable region. In some antibodies, the first light chain further includes a Lambda variable region. In some antibodies, the second light chain includes at least a Lambda constant region. In some antibodies, the second light chain further includes a Lambda variable region. In some antibodies, the second light chain further includes a Kappa variable region. In some antibodies, the first light chain includes a Kappa constant region and a Kappa variable region, and the second light chain includes a Lambda constant region and a Lambda variable region. In some embodiments, the constant and variable framework region sequences are human.
- anti-CD47 arms monospecific anti-CD47 antibodies, monovalent anti-CD47 antibodies, and/or bispecific antibodies in which at least one binding site is specific for CD47 contain a variable heavy chain amino acid sequence that is at least 90%,
- the invention provides monoclonal antibodies that bind CD47.
- the invention provides monoclonal antibodies that inhibit the interaction between human CD47 at the surface of cells and soluble human SIRPa with an IC50 greater than 0.3 nM in the assay described in Example 4 and in which the antibody 5A3M3 has an IC50 of approximately 0.36 nM.
- the invention also provides monoclonal antibodies that bind CD47 and are recovered at more than 80% after incubation at 37°C for 30 minutes in human whole blood at a concentration of 10 ⁇ / ⁇ 1 as described in Example 15.
- the monoclonal antibody inhibits interaction between CD47 and signal-regulatory protein alpha (SIRPa).
- SIRPa signal-regulatory protein alpha
- the monoclonal antibody inhibits interaction between human CD47 and human SIRPa.
- the invention also provides anti-CD47 monoclonal antibodies that include a variable heavy chain complementarity determining region 1 (CDRH1) amino acid sequence of SEQ ID NO: 225, a variable heavy chain complementarity determining region 2 (CDRH2) amino acid sequence of SEQ ID NO: 226, a variable heavy chain complementarity determining region 3 (CDRH3) amino acid sequence of SEQ ID NO: 227, a variable light chain complementarity determining region 1 (CDRL1) amino acid sequence selected from SEQ ID NO: 228-241 and 262-272, a variable light chain complementarity determining region 2 (CDRL2) amino acid sequence selected from 242-245 and 273-280, and a variable light chain complementarity determining region 3 (CDRH3) amino acid sequence selected from 246-261 and 281.
- CDRH1 variable heavy chain complementarity determining region 1
- CDRL1 variable heavy chain complementarity determining region 2
- CDRL2 variable light chain complementarity determining region 2
- CDRL3 variable light chain complementarity determining region
- the anti-CD47 monoclonal antibody includes a variable heavy chain amino acid sequence that is at least 90%>, 91%>, 92%, 93%>, 94%>, 95%,
- the anti-CD47 monoclonal antibody includes a variable light chain amino acid sequence that is at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%,
- the anti-CD47 monoclonal antibody includes a variable heavy chain amino acid sequence that is at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more identical to the amino acid sequence of SEQ ID NO: 114, and a variable light chain amino acid sequence that is at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more identical to an amino acid sequence selected from SEQ ID NO: 116, 118, 120, 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 142, 144, 146, 148, 150, 152, 154, 156, 158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198, 200, 202, 204 and 206
- the anti-CD47 monoclonal antibody includes a variable heavy chain amino acid sequence of SEQ ID NO: 114 and a variable light chain amino acid sequence selected from SEQ ID NO: 116, 118, 120, 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 142, 144, 146, 148, 150, 152, 154, 156, 158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198, 200, 202, 204 and 206.
- the anti-CD47 antibody includes a combination of a variable heavy chain sequence and a variable light chain sequence selected from the group consisting of the combinations shown in 5A3, 5A3M4, 5A3M3, 5A3M5, KE8, KE8F2, KE8G2, KE84G9, KE81G9, KE81A3, KE8E8, KE8G6, KE8H5, KE8A2, KE8H3, KE8C7, KE8B2, KE8A4, KE8A8, KE8G11, KE8B7, KE8F1, KE8C4, KE8A3, KE86G9, KE8H6, KA3, KA3H8, KA3A3, KA3C5, KA3B2, KA3A2, KA3D3, KA3G2, KA3H3, KC4, KC4E2, KC4F4, KC4A1, KC4C11, KC4E10, KC4B1,
- the invention provides monoclonal antibodies that bind CD 19. These antibodies are collectively referred to herein as anti-CD 19 monoclonal antibodies or anti- CD ⁇ mAbs.
- the monoclonal antibodies are specific for at least human CD 19.
- the monoclonal antibodies that recognize human CD 19 are also cross- reactive for at least one other non-human CD 19 protein, such as, by way of non- limiting example, non-human primate CD19, e.g., cynomolgus monkey CD19, and/or rodent CD19.
- the anti-CD 19 monoclonal antibody includes a variable heavy chain amino acid sequence that is at least 90%>, 91%>, 92%>, 93%>, 94%>, 95%>, 96%, 97%, 98%, 99% or more identical to the amino acid sequence of SEQ ID NO: 114.
- the anti-CD 19 monoclonal antibody includes a variable light chain amino acid sequence that is at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more identical to an amino acid sequence selected from SEQ ID NO: 208, 210, 212, 214, 216, 218, and 220.
- the anti-CD19 monoclonal antibody includes a variable heavy chain amino acid sequence that is at least 90%>, 91%>, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more identical to the amino acid sequence of SEQ ID NO: 114, and a variable light chain amino acid sequence that is at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more identical to an amino acid sequence selected from SEQ ID NO: 208, 210, 212, 214, 216, 218, and 220.
- the anti-CD 19 monoclonal antibody includes a variable heavy chain amino acid sequence of SEQ ID NO: 114 and a variable light chain amino acid sequence selected from SEQ ID NO: 208, 210, 212, 214, 216, 218, and 220.
- the invention also provides monovalent antibodies that bind CD 19. These antibodies are collectively referred to herein as anti-CD 19 monovalent antibodies or anti- CD ⁇ monov mAbs.
- the monovalent antibodies of the invention include one arm that specific recognizes CD 19, and a second arm referred to herein as a dummy arm.
- the dummy arm includes an amino acid sequence that does not bind or otherwise cross-react with a human protein.
- the dummy arm includes an amino acid sequence that does not bind or otherwise cross-react with a human protein that is found in whole blood.
- the dummy arm includes an amino acid sequence that does not bind or otherwise cross-react with a human protein that is found in solid tissue.
- the monovalent antibodies are specific for at least human CD 19.
- the monovalent antibodies that recognize human CD 19 are also cross- reactive for at least one other non-human CD 19 protein, such as, by way of non- limiting example, non-human primate CD19, e.g., cynomolgus monkey CD19, and/or rodent CD19.
- the invention also provides bispecific antibodies that recognize CD 19 and a second target.
- the second target is an antigen known to be associated or otherwise implicated in autoimmune diseases and/or inflammatory diseases, such as, for example, B-cell mediated autoimmune diseases and/or inflammatory diseases, including by way of non-limiting example, systemic lupus erythematosus (SLE), rheumatoid arthritis (PvA), idiopathic thrombocytopenic purpura (ITP), Waldenstrom's hypergammaglobulinemia, Sjogren's syndrome, multiple sclerosis (MS), and/or lupus nephritis.
- SLE systemic lupus erythematosus
- PvA rheumatoid arthritis
- ITP idiopathic thrombocytopenic purpura
- MS multiple sclerosis
- suitable second targets include, by way of non- limiting example, CD20, CD22, CD40, BAFFR, CD5, CD32b, ICOSL, IL6R, and/or IL21R.
- the bispecific antibodies of the invention that recognize CD 19 and a second target are generated using any methods known in the art such as, by way of non-limiting example, the use of cross-linked fragments, quadromas, and/or any of a variety of recombinant formats such as, by way of non-limiting examples, linked antibody fragments, forced heterodimers, and or recombinant formats based on single domains.
- the invention allows for the identification, production and purification of bispecific antibodies that are undistinguishable in sequence from standard antibodies and where one of the binding sites is specific for CD 19 and the second binding site is specific for another target, for example a tumor-associated antigen (TAA).
- TAA tumor-associated antigen
- the unmodified nature of the antibodies of the invention provides them with favorable manufacturing and biochemical characteristics similar to standard monoclonal antibodies.
- the bispecific antibodies carry a different specificity in each combining site and including two copies of a single heavy chain polypeptide and a first light chain and a second light chain, wherein the first and second light chains are different.
- At least a first portion of the first light chain is of the
- the first light chain includes at least a Kappa constant region. In some antibodies, the first light chain further includes a Kappa variable region. In some antibodies, the first light chain further includes a Lambda variable region. In some antibodies, the second light chain includes at least a Lambda constant region. In some antibodies, the second light chain further includes a Lambda variable region. In some antibodies, the second light chain further includes a Kappa variable region. In some antibodies, the first light chain includes a Kappa constant region and a Kappa variable region, and the second light chain includes a Lambda constant region and a Lambda variable region. In some embodiments, the constant and variable framework region sequences are human.
- the monoclonal, monovalent and/or bispecific antibodies of the invention can be used for therapeutic intervention or as a research or diagnostic reagent.
- the monoclonal, monovalent and/or bispecific antibodies of the invention are useful in methods of treating, preventing and/or delaying the progression of pathologies associated with aberrant CD47 and/or aberrant CD47-SIRPa expression and/or activity or alleviating a symptom associated with such pathologies, by administering an antibody of the invention to a subject in which such treatment or prevention is desired.
- the subject to be treated is, e.g., human.
- the monoclonal, monovalent and/or bispecific antibody is administered in an amount sufficient to treat, prevent, delay the progression or alleviate a symptom associated with the pathology.
- the monoclonal, monovalent and/or bispecific antibodies described herein are used in conjunction with one or more additional agents or a combination of additional agents.
- additional agents include current pharmaceutical and/or surgical therapies for an intended application, such as, for example, cancer, inflammation and/or autoimmune diseases.
- the monoclonal, monovalent and/or bispecific antibodies can be used in conjunction with rituximab.
- the monoclonal, monovalent and/or bispecific antibodies and the additional agent are formulated into a single therapeutic composition, and the monoclonal, monovalent and/or bispecific antibody and additional agent are administered simultaneously.
- the ac monoclonal, monovalent and/or bispecific antibodies and additional agent are separate from each other, e.g., each is formulated into a separate therapeutic composition, and the monoclonal, monovalent and/or bispecific antibody and the additional agent are administered simultaneously, or the monoclonal, monovalent and/or bispecific antibodies and the additional agent are administered at different times during a treatment regimen.
- the monoclonal, monovalent and/or bispecific antibody is administered prior to the administration of the additional agent, the monoclonal, monovalent and/or bispecific antibody is administered subsequent to the administration of the additional agent, or the monoclonal, monovalent and/or bispecific antibody and the additional agent are administered in an alternating fashion.
- the monoclonal, monovalent and/or bispecific antibody and additional agent are administered in single doses or in multiple doses.
- Pathologies treated and/or prevented using the antibodies of the invention include, for example, cancer or any other disease or disorder associated with aberrant CD47 expression and/or activity.
- the invention also provides methods of producing bispecific antibodies that exhibit an "unbalanced" affinity for each of the two targets.
- the affinity of the anti-CD 19 arm is increased using affinity maturation.
- affinity maturation for example, in some embodiments of an anti-CD47/CD19 bispecific antibody
- CD47/CD19 bispecific antibody the affinity of the anti-CD47 arm is decreased using affinity dematuration.
- affinity dematuration for example, in some embodiments an anti-CD47/CD19 bispecific antibody, the affinity of the anti-CD 19 arm is increased using affinity maturation, and the affinity of the anti-CD47 arm is decreased using affinity de-maturation.
- affinity bispecific antibodies are useful, for example, to improve selectivity for a target cell or group of target cells.
- compositions according to the invention can include an antibody of the invention and a carrier. These pharmaceutical compositions can be included in kits, such as, for example, diagnostic kits.
- Figure 1 is an illustration of the sequence alignment between the variable light chain (VL) sequence of the anti-CD47 antibody 5A3 (SEQ ID NO: 116) to its closest germline sequence (SEQ ID NO: 282), the human IGKV1-33 according to the IMGT nomenclature.
- VL variable light chain
- Figure 2 is a graph depicting the blocking potency of the 5A3-M3 and 5A3-
- M5 antibody variants as compared to the parental antibody 5A3 in a CD47/SIRPa binding assay.
- Figure 3 is a graph depicting the specificity of various CD47 monoclonal antibodies (Mabs) as indicated by the binding of purified CD47 Mabs to CHO cells transfected with human CD47, assessed by flow cytometry (grey bars). CD47 MAbs did not bind to non-trans fected CHO cells (black bars).
- Figure 4 is a graph depicting binding to native CD47 and specificity of CD47
- MAbs as shown by binding of purified CD47 Mabs to HEK293-P cells as assessed by flow cytometry (grey bars). Binding to HEK293-P cells stably transfected with hCD47-specific siRNA is significantly decreased (black bars).
- Figure 5 is a graph depicting binding to native human CD47 and cross- reactivity with cynomolgus CD47. The binding of purified CD47 Mabs to human (light grey bars) and cynomolgus (dark grey bars) PBMC CD4+ T cells was evaluated.
- Figure 6 is a graph depicting the potency of CD47 Mabs to block the CD47-
- CD47-SIRPa inhibition assay competitive inhibition of the binding of recombinant soluble human SIRPa to hCD47-expressing CHO cells, as described in Example 4
- IC50 values obtained in dose-response experiments are shown.
- CD47 Mabs are grouped by family and ranked from higher to lower potency.
- the neutralizing activity of the antibodies of the present invention is compared to the commercially available CD47 antibody B6H12.
- Figure 7 is an illustration depicting the hemagglutination activity of CD47 antibodies. Hemagglutination is evidenced as a clumped deposit of RBC, in the form of a crescent at the bottom around the inferior border of the well, whereas non-agglutinated are do not form aggregates and are distributed evenly over the well surface area.
- Figure 7 demonstrates that high-affinity CD47 Mabs of the 5A3, Ke8, and Ka3 families induce hemagglutination; in contrast to the other three families, Kc4 family antibodies tested in this experiment do not induce hemagglutination.
- Figure 8 is a graph depicting dose-response curve for a FACS-binding assay done with Raji cells and the original anti-CD19 clone 1B7, clone Dl l identified following the first affinity maturation round, and the final clone L7B7_c2, issued form the second affinity maturation round.
- Figures 9A-9C are a series of graphs the ability of a CD47xCD19 BsAb to co-engage the two targets at the surface of cells.
- the graphs in Figures 9A-9C present FACS profiles generated with monovalent and bispecific antibodies binding to CD 19- negative B-NHL cells (DS-1) and CD19-positive Burkitt lymphoma cells (Raji). All antibodies were human IgGl format and were tested at four concentrations as indicated.
- Figure 10 is a series of graphs depicting the SIRPa Blocking Activity of
- Figure 10 demonstrates the co-engagement of CD 19 and CD47 on the surface of the target cell, by showing that the neutralization of CD47- SIRPa interaction by CD47xCD19 BsAbs is CD19-dependent. The experiments were done in quadruplicates Mean and SEM are shown. Dose-response inhibition curves were fitted with GraphPad software.
- Figures 11A-11C show ADCC dose-response curves generated with
- CD47xCD19 ⁇ bodies black
- CD47 monovalent antibodies grey
- ADCC with the CD 19 Mab C2 is shown for comparison (dashed grey).
- the ADCC assay was performed with whole human PBMCs as effector cells and Calcein AM-stained Raji
- Figure 12 is a graph depicting the phagocytic activity of three of the
- CD47xCD19 ⁇ bodies of the present invention black lines
- CD47 monovalent antibodies grey lines
- Phagocytosis with the CD47 Mab B6H12 on human IgGl background, dotted black line
- CD 19 Mab C2 dotted grey line
- the ADCP experiment was performed with human macrophages differentiated from peripheral blood monocytes and Raji as target cells (effector: target ratio 1 :5) Phagocytosis was assessed by FACS. The percentage of macrophages having phagocytosed at least one target cells is shown.
- Figure 14 is a graph depicting that high and moderate affinity CD47 antibodies are efficiently adsorbed on erythrocytes. In the case of BsAbs, this phenomenon is limited to molecules having a high affinity CD47 arms, such as 5 A3.
- the invention provides monoclonal antibodies that bind CD47. These antibodies are collectively referred to herein as anti-CD47 monoclonal antibodies or anti- CD47 mAbs.
- the monoclonal antibodies are specific for at least human CD47.
- the monoclonal antibodies that recognize human CD47 are also cross- reactive for at least one other non-human CD47 protein, such as, by way of non-limiting example, non-human primate CD47, e.g., cynomolgus monkey CD47, and/or rodent CD47.
- these anti-CD47 monoclonal antibodies inhibit the interaction between CD47 and signal-regulatory protein alpha (SIRPa).
- SIRPa signal-regulatory protein alpha
- these anti-CD47 monoclonal antibodies inhibit the interaction between human CD47 and human SIRPa.
- the invention also include antibodies that bind to the same epitope as an anti-CD47 monoclonal antibody disclosed herein and inhibits the interaction between CD47 and SIRPa, e.g., between human CD47 and human SIRPa.
- the invention also provides monovalent antibodies and/or bispecific antibodies that include at least a first arm that is specific for CD47.
- the monovalent antibodies and/or bispecific antibodies are specific for at least human CD47.
- the monovalent antibodies and/or bispecific antibodies that recognize human CD47 are also cross-reactive for at least one other non-human CD47 protein, such as, by way of non-limiting example, non-human primate CD47, e.g., cynomolgus monkey CD47, and/or rodent CD47.
- these anti-CD47 monovalent antibodies and/or anit-CD47 bispecific antibodies inhibit the interaction between CD47 and signal- regulatory protein alpha (SIRPa).
- these anti-CD47 monovalent antibodies and/or anit-CD47 bispecific antibodies inhibit the interaction between human CD47 and human SIRPa.
- the invention also include antibodies that bind to the same epitope as an anti-CD47 monovalent and/or an anti-CD47 bispecific antibody disclosed herein and inhibits the interaction between CD47 and SIRPa, e.g., between human CD47 and human SIRPa.
- the bispecific antibodies of the invention allow for simultaneous binding of the two antibody arms to two antigens on the surface of the cell (termed co-engagement), which results in additive or synergistic increase of affinity due to avidity mechanism.
- co-engagement confers high selectivity towards cells expressing both antigens as compared to cells that express just one single antigen.
- the affinities of the two arms of a bispecific antibody to their respective targets can be set up in a way that binding to target cells is principally driven by one of the antibody arms.
- the bispecific antibody includes a first arm that binds CD47 and a second arm that binds a tumor associated antigen (TAA), where the second arm binds to the TAA with high affinity, and the first arm binds to CD47 with low affinity, i.e., an affinity that is sufficient to inhibit CD47/SIRPa upon TAA co-engagement.
- TAA tumor associated antigen
- CD47 with low affinity and a second arm that binds CD 19 with high affinity allow preferential inhibition of CD47 in cancer versus normal cells.
- the CD47 x TAA bispecific antibody requires a functional Fc portion to recruit macrophages and/or other immune effector cells.
- a fully human bispecific IgG format (such as the ⁇ -body format described herein) is well suited for the generation of dual targeting CD47 x TAA bispecific antibodies.
- the ability of dual targeting bispecific antibodies to co-engage CD47 and CD 19 results in a significant increase in the affinity of binding to CD19-positive cells and in CD19-dependent neutralization of the CD47-SIRPa interaction. This, in turn, translates into efficient and selective cancer cell killing mediated by the CD47xCD19 bispecific antibody, as demonstrated in the ADCC and ADCP experiments provided herein.
- CD47 monovalent antibodies, and/or bispecific antibodies of the invention in which at least one binding site is specific for CD47 include, for example, the 5A3 antibody, the 5A3M4 antibody, the 5A3M3 antibody, the 5A3M5 antibody, the KE8 antibody, the KE8-P6H5 antibody (also referred to herein as KE8H5), the KE8-P3B2 antibody (also referred to herein as KE8B2), the KE8-P2A2 antibody (also referred to herein as KE8A25), the KE8F2 antibody, the KE8G2 antibody, the KE84G9 antibody, the KE81G9 antibody, the KE81A3 antibody, the KE8E8 antibody, the KE8G6 antibody, the KE8H3 antibody, the KE8C7 antibody, the KE8A4 antibody, the KE8A8 antibody, the KE8G11 antibody, the KE8B7 antibody, the KE8F1 antibody, the
- CD47 antibodies, anti-CD47 monovalent antibodies, and/or bispecific antibodies of the invention include a combination of heavy chain and light chain complementarity determining regions (CDRs) selected from the CDR sequences shown in Tables 1, 2 and 3, where the CDRs shown in Tables 1, 2 and 3 are defined according to the IMGT nomenclature.
- CDRs heavy chain and light chain complementarity determining regions
- CD47 antibodies, anti-CD47 monovalent antibodies, and/or bispecific antibodies of the invention include the combination of heavy chain CDR sequences from Table 1 and two sets of light chain CDRs selected from the CDRLl, CDRL2 and CDRL3 sequences shown in Tables 2 and 3.
- CD47 antibodies, anti-CD47 monovalent antibodies, and/or bispecific antibodies of the invention include the combination of heavy chain CDR sequences from Table 1 and a first set of light chain CDRs selected from the CDRLl, CDRL2 and CDRL3 sequences shown in Table 2 and a second set of light chain CDRs selected from the CDRLl, CDRL2 and CDRL3 sequences shown in Table 3.
- Each of the exemplary anti-CD47, anti-CD 19, monovalent and bispecific antibodies described herein include a common heavy chain (HC), one kappa chain or one lambda chain for anti-CD47 and anti-CD 19 antibodies, one kappa and one lambda light chains (LC) for monovalent and bispecific antibodies, as shown in the amino acid and corresponding nucleic acid sequences listed below.
- HC common heavy chain
- LC lambda light chains
- Each of the exemplary anti-CD47, anti- CD ⁇ , monovalent and bispecific antibodies described below includes a common variable heavy domain (VH), one kappa variable light domain or one lambda variable light domain for anti-CD47 and anti-CD 19 antibodies, one kappa and one lambda variable light domains (VL) for monovalent and bispecific antibodies, as shown in the amino acid and corresponding nucleic acid sequences listed below.
- VH variable heavy domain
- VL lambda variable light domains
- bispecific formats include but are not limited to bispecific IgG based on Fab arm exchange (Gramer et al, 2013 MAbs. 5(6)); the CrossMab format (Klein C et al, 2012 MAbs 4(6)); multiple formats based on forced heterodimerization approaches such as SEED technology (Davis JH et al, 2010 Protein Eng Des Sel. 23(4): 195-202), electrostatic steering (Gunasekaran K et al, J Biol Chem.
- the exemplary anti-CD47, anti-CD 19, monovalent and bispecific antibodies include a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1.
- the 5A3 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 4) encoded by the nucleic acid sequence shown in SEQ ID NO: 3.
- the 5A3 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 116) encoded by the nucleic acid sequence shown in SEQ ID NO: 115.
- the 5A3-M4 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 6) encoded by the nucleic acid sequence shown in SEQ ID NO: 5.
- the 5A3-M4 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 118) encoded by the nucleic acid sequence shown in SEQ ID NO: 117.
- the 5A3-M3 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 8) encoded by the nucleic acid sequence shown in SEQ ID NO: 7.
- the 5A3-M3 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 120) encoded by the nucleic acid sequence shown in SEQ ID NO: 119.
- the 5A3-M5 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 10) encoded by the nucleic acid sequence shown in SEQ ID NO: 9.
- the 5A3-M5 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 122) encoded by the nucleic acid sequence shown in SEQ ID NO: 121.
- the Ke8 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 12) encoded by the nucleic acid sequence shown in SEQ ID NO: 11. >Ke8-LC-NT (SEQ ID NO: 11)
- the Ke8 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Ke8H5 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 14) encoded by the nucleic acid sequence shown in SEQ ID NO: 13.
- the Ke8H5 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 126) encoded by the nucleic acid sequence shown in SEQ ID NO: 125.
- the Ke8B2 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 16) encoded by the nucleic acid sequence shown in SEQ ID NO: 15.
- the Ke8B2 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Ke8A2 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 18) encoded by the nucleic acid sequence shown in SEQ ID NO: 17.
- the Ke8A2 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 130) encoded by the nucleic acid sequence shown in SEQ ID NO: 129. >KE8A2-VL-NT (SEQ ID NO: 129)
- the Ke8E8 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 20) encoded by the nucleic acid sequence shown in SEQ ID NO: 19.
- the Ke8E8 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 132) encoded by the nucleic acid sequence shown in SEQ ID NO: 131.
- the Ke8H3 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 22) encoded by the nucleic acid sequence shown in SEQ ID NO: 21.
- Ke8H3 antibody includes a common variable heavy domain (SEQ ID NO: 1
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 134) encoded by the nucleic acid sequence shown in SEQ ID NO: 133.
- the Ke8G6 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 24) encoded by the nucleic acid sequence shown in SEQ ID NO: 23.
- the Ke8G6 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 1134 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 136) encoded by the nucleic acid sequence shown in SEQ ID NO: 135.
- the Ke8A3 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 26) encoded by the nucleic acid sequence shown in SEQ ID NO: 25.
- the Ke8A3 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 1144 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 138) encoded by the nucleic acid sequence shown in SEQ ID NO: 137.
- the Ke81A3 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 28) encoded by the nucleic acid sequence shown in SEQ ID NO: 27.
- the Ke81A3 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 140) encoded by the nucleic acid sequence shown in SEQ ID NO: 139.
- the Ke8A8 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 30) encoded by the nucleic acid sequence shown in SEQ ID NO: 29.
- Ke8A8 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 142) encoded by the nucleic acid sequence shown in SEQ ID NO: 141.
- the Ke8C7 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 32) encoded by the nucleic acid sequence shown in SEQ ID NO: 31. >KE8C7-LC-NT (SEQ ID NO: 31)
- the Ke8C7 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Ke8G2 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 34) encoded by the nucleic acid sequence shown in SEQ ID NO: 33.
- the Ke8G2 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 146) encoded by the nucleic acid sequence shown in SEQ ID NO: 145.
- the Ke81G9 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 36) encoded by the nucleic acid sequence shown in SEQ ID NO: 35.
- the Ke81G9 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Ke8F2 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 38) encoded by the nucleic acid sequence shown in SEQ ID NO: 37.
- the Ke8F2 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 150) encoded by the nucleic acid sequence shown in SEQ ID NO: 149. >KE8F2-VL-NT (SEQ ID NO: 149)
- the Ke8B7 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 40) encoded by the nucleic acid sequence shown in SEQ ID NO: 39.
- the Ke8B7 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 152) encoded by the nucleic acid sequence shown in SEQ ID NO: 151.
- the Ke8C4 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 42) encoded by the nucleic acid sequence shown in SEQ ID NO: 41.
- Ke8C4 antibody includes a common variable heavy domain (SEQ ID NO:
- the Ke8Fl antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 44) encoded by the nucleic acid sequence shown in SEQ ID NO: 43.
- Ke8Fl antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Ke8Gl l antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 46) encoded by the nucleic acid sequence shown in SEQ ID NO: 45.
- Ke8Gl l antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Ke8H6 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 48) encoded by the nucleic acid sequence shown in SEQ ID NO: 47.
- the Ke8H6 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Ke84G9 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 50) encoded by the nucleic acid sequence shown in SEQ ID NO: 49.
- the Ke84G9 antibody includes a common variable heavy domain (SEQ ID NO: 1
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 162) encoded by the nucleic acid sequence shown in SEQ ID NO: 161.
- the Ke8A4 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 52) encoded by the nucleic acid sequence shown in SEQ ID NO: 51. >KE8A4-LC-NT (SEQ ID NO: 51)
- the Ke8A4 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Ke86G9 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 54) encoded by the nucleic acid sequence shown in SEQ ID NO: 53.
- the Ke86G9 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 166) encoded by the nucleic acid sequence shown in SEQ ID NO: 165.
- the Ka3 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 56) encoded by the nucleic acid sequence shown in SEQ ID NO: 55.
- the Ka3 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Ka3A2 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 58) encoded by the nucleic acid sequence shown in SEQ ID NO: 57.
- the Ka3A2 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 170) encoded by the nucleic acid sequence shown in SEQ ID NO: 169. >KA3A2-VL-NT (SEQ ID NO: 169)
- the Ka3H3 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 60) encoded by the nucleic acid sequence shown in SEQ ID NO: 59.
- the Ka3H3 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 1134 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 172) encoded by the nucleic acid sequence shown in SEQ ID NO: 171.
- the Ka3A3 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 62) encoded by the nucleic acid sequence shown in SEQ ID NO: 61.
- the Ka3A3 antibody includes a common variable heavy domain (SEQ ID NO: 1
- the Ka3H8 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 64) encoded by the nucleic acid sequence shown in SEQ ID NO: 63.
- the Ka3H8 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 1134 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 176) encoded by the nucleic acid sequence shown in SEQ ID NO: 175.
- the Ka3B2 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 66) encoded by the nucleic acid sequence shown in SEQ ID NO: 65.
- the Ka3B2 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Ka3C5 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 68) encoded by the nucleic acid sequence shown in SEQ ID NO: 67.
- the Ka3C5 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Ka3G2 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 70) encoded by the nucleic acid sequence shown in SEQ ID NO: 69.
- the Ka3G2 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a kappa variable light domain (SEQ ID NO: 182) encoded by the nucleic acid sequence shown in SEQ ID NO: 181.
- the Ka3D3 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a kappa light chain (SEQ ID NO: 72) encoded by the nucleic acid sequence shown in SEQ ID NO: 71. >KA3D3-LC-NT (SEQ ID NO: 71)
- the Ka3D3 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Kc4 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 74) encoded by the nucleic acid sequence shown in SEQ ID NO: 73.
- the Kc4 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Kc4Gl l antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 76) encoded by the nucleic acid sequence shown in SEQ ID NO: 75.
- the Kc4Gl l antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Kc4Cl l antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 78) encoded by the nucleic acid sequence shown in SEQ ID NO: 77.
- the Kc4Cl l antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Kc4Al antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 80) encoded by the nucleic acid sequence shown in SEQ ID NO: 79.
- the Kc4Al antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Kc4A4 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 82) encoded by the nucleic acid sequence shown in SEQ ID NO: 81.
- the Kc4A4 antibody includes a common variable heavy domain (SEQ ID NO:
- the Kc4E10 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 84) encoded by the nucleic acid sequence shown in SEQ ID NO: 83.
- the Kc4E10 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Kc4G9 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 86) encoded by the nucleic acid sequence shown in SEQ ID NO: 85.
- the Kc4G9 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Kc4C3 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 88) encoded by the nucleic acid sequence shown in SEQ ID NO: 87.
- the Kc4C3 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 200 a lambda variable light domain
- the Kc4F4 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 90) encoded by the nucleic acid sequence shown in SEQ ID NO: 89.
- the Kc4F4 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a lambda variable light domain (SEQ ID NO: 202) encoded by the nucleic acid sequence shown in SEQ ID NO: 201.
- the Kc4Bl antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 92) encoded by the nucleic acid sequence shown in SEQ ID NO: 91. >KC4B1-LC-NT (SEQ ID NO: 91)
- the Kc4Bl antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Kc4E2 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 94) encoded by the nucleic acid sequence shown in SEQ ID NO: 93.
- the Kc4E2 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the C2 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 96) encoded by the nucleic acid sequence shown in SEQ ID NO: 95.
- the C2 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the A6 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 98) encoded by the nucleic acid sequence shown in SEQ ID NO: 97.
- the A6 antibody includes a common variable heavy domain (SEQ ID NO: 1
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a lambda variable light domain (SEQ ID NO: 210) encoded by the nucleic acid sequence shown in SEQ ID NO: 209.
- the C6 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 100) encoded by the nucleic acid sequence shown in SEQ ID NO: 99.
- the C6 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a lambda variable light domain (SEQ ID NO: 212) encoded by the nucleic acid sequence shown in SEQ ID NO: 211.
- the C9 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 102) encoded by the nucleic acid sequence shown in SEQ ID NO: 101.
- the C9 antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the Bl 1 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 104) encoded by the nucleic acid sequence shown in SEQ ID NO: 103.
- the Bl l antibody includes a common variable heavy domain (SEQ ID NO: 1]
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a lambda variable light domain (SEQ ID NO: 216) encoded by the nucleic acid sequence shown in SEQ ID NO: 215.
- the Dl 1 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 106) encoded by the nucleic acid sequence shown in SEQ ID NO: 105. >D11-LC-NT (SEQ ID NO: 105)
- the Dl l antibody includes a common variable heavy domain (SEQ ID NO: 1]
- the B7 antibody includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1 and includes a lambda light chain (SEQ ID NO: 108) encoded by the nucleic acid sequence shown in SEQ ID NO: 107.
- the B7 antibody includes a common variable heavy domain (SEQ ID NO: 1
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113 and includes a lambda variable light domain (SEQ ID NO: 220) encoded by the nucleic acid sequence shown in SEQ ID NO: 219.
- the Dummy light chain 1 (SEQ ID NO: 110) is encoded by the nucleic acid sequence shown in SEQ ID NO: 109.
- the Dummy variable light domain 1 (SEQ ID NO: 222) is encoded by the nucleic acid sequence shown in SEQ ID NO: 221.
- the Dummy light chain 2 (SEQ ID NO: 112) is encoded by the nucleic acid sequence shown in SEQ ID NO: 111.
- the Dummy variable light domain 2 (SEQ ID NO: 224) is encoded by the nucleic acid sequence shown in SEQ ID NO: 223.
- the monovalent antibody 5 A3 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 4) encoded by the nucleic acid sequence shown in SEQ ID NO: 3 and a lambda dummy light chain 1 (SEQ ID NO: 110) encoded by the nucleic acid sequence shown in SEQ ID NO: 109.
- SEQ ID NO: 2 encoded by the nucleic acid sequence shown in SEQ ID NO: 1
- SEQ ID NO: 4 encoded by the nucleic acid sequence shown in SEQ ID NO: 3
- SEQ ID NO: 110 a lambda dummy light chain 1
- the monovalent antibody 5 A3 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 116) encoded by the nucleic acid sequence shown in SEQ ID NO: 115 and a lambda dummy variable light domain 1 (SEQ ID NO: 222) encoded by the nucleic acid sequence shown in SEQ ID NO: 221.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 116 encoded by the nucleic acid sequence shown in SEQ ID NO: 115
- SEQ ID NO: 222 a lambda dummy variable light domain 1
- the monovalent antibody 5A3-M3 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 8) encoded by the nucleic acid sequence shown in SEQ ID NO: 7 and a lambda dummy light chain 1 (SEQ ID NO: 110) encoded by the nucleic acid sequence shown in SEQ ID NO: 109.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 8 a kappa light chain
- SEQ ID NO: 110 a lambda dummy light chain 1
- the monovalent antibody 5A3-M3 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 120) encoded by the nucleic acid sequence shown in SEQ ID NO: 119 and a lambda dummy variable light domain 1 (SEQ ID NO: 222) encoded by the nucleic acid sequence shown in SEQ ID NO: 221.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 120 kappa variable light domain
- SEQ ID NO: 222 a lambda dummy variable light domain 1
- the monovalent antibody 5A3-M5 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 10) encoded by the nucleic acid sequence shown in SEQ ID NO: 9 and a lambda dummy light chain 1 (SEQ ID NO: 110) encoded by the nucleic acid sequence shown in SEQ ID NO: 109.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 10 a kappa light chain
- SEQ ID NO: 110 a lambda dummy light chain 1
- the monovalent antibody 5A3-M5 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 122) encoded by the nucleic acid sequence shown in SEQ ID NO: 121 and a lambda dummy variable light domain 1 (SEQ ID NO: 222) encoded by the nucleic acid sequence shown in SEQ ID NO: 221.
- the monovalent antibody Ke8 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 12) encoded by the nucleic acid sequence shown in SEQ ID NO: 11 and a lambda dummy light chain 1 (SEQ ID NO: 110) encoded by the nucleic acid sequence shown in SEQ ID NO: 109.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 12 kappa light chain
- SEQ ID NO: 110 a lambda dummy light chain 1
- the monovalent antibody Ke8 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 124) encoded by the nucleic acid sequence shown in SEQ ID NO: 123 and a lambda dummy variable light domain 1 (SEQ ID NO: 222) encoded by the nucleic acid sequence shown in SEQ ID NO: 221.
- the monovalent antibody Ke8A2 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 18) encoded by the nucleic acid sequence shown in SEQ ID NO: 17 and a lambda dummy light chain 1 (SEQ ID NO: 110) encoded by the nucleic acid sequence shown in SEQ ID NO: 109.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 18 kappa light chain
- SEQ ID NO: 110 a lambda dummy light chain 1
- the monovalent antibody Ke8A2 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 130) encoded by the nucleic acid sequence shown in SEQ ID NO: 129 and a lambda dummy variable light domain 1 (SEQ ID NO: 222) encoded by the nucleic acid sequence shown in SEQ ID NO: 221.
- the monovalent antibody Ke8B2 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 2,
- SEQ ID NO: 1 a kappa light chain (SEQ ID NO: 16) encoded by the nucleic acid sequence shown in SEQ ID NO: 15 and a lambda dummy light chain 1 (SEQ ID NO: 110) encoded by the nucleic acid sequence shown in SEQ ID NO: 109.
- the monovalent antibody Ke8B2 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 128) encoded by the nucleic acid sequence shown in SEQ ID NO: 127 and a lambda dummy variable light domain 1 (SEQ ID NO: 222) encoded by the nucleic acid sequence shown in SEQ ID NO: 221.
- the monovalent antibody Ke8Gl 1 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 46) encoded by the nucleic acid sequence shown in SEQ ID NO: 45 and a lambda dummy light chain 1 (SEQ ID NO: 110) encoded by the nucleic acid sequence shown in SEQ ID NO: 109.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 46 kappa light chain
- SEQ ID NO: 110 a lambda dummy light chain 1
- the monovalent antibody Ke8Gl l includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 158) encoded by the nucleic acid sequence shown in SEQ ID NO: 157 and a lambda dummy variable light domain 1 (SEQ ID NO: 222) encoded by the nucleic acid sequence shown in SEQ ID NO: 221.
- the monovalent antibody Ke8C4 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 42) encoded by the nucleic acid sequence shown in SEQ ID NO: 41 and a lambda dummy light chain 1 (SEQ ID NO: 110) encoded by the nucleic acid sequence shown in SEQ ID NO: 109.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 42 kappa light chain
- SEQ ID NO: 110 a lambda dummy light chain 1
- the monovalent antibody Ke8C4 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 154) encoded by the nucleic acid sequence shown in SEQ ID NO: 153 and a lambda dummy variable light domain 1 (SEQ ID NO: 222) encoded by the nucleic acid sequence shown in SEQ ID NO: 221.
- the monovalent antibody Ke8A3 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 26) encoded by the nucleic acid sequence shown in SEQ ID NO: 25 and a lambda dummy light chain 1 (SEQ ID NO: 110) encoded by the nucleic acid sequence shown in SEQ ID NO: 109.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 26 kappa light chain
- SEQ ID NO: 110 a lambda dummy light chain 1
- the monovalent antibody Ke8A3 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 138) encoded by the nucleic acid sequence shown in SEQ ID NO: 137 and a lambda dummy variable light domain 1 (SEQ ID NO: 222) encoded by the nucleic acid sequence shown in SEQ ID NO: 221.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 138 kappa variable light domain
- SEQ ID NO: 222 a lambda dummy variable light domain 1
- the monovalent antibody Ka3 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 56) encoded by the nucleic acid sequence shown in SEQ ID NO: 55 and a lambda dummy light chain 1 (SEQ ID NO: 110) encoded by the nucleic acid sequence shown in SEQ ID NO: 109.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 56 kappa light chain
- SEQ ID NO: 110 a lambda dummy light chain 1
- the monovalent antibody Ka3 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 168) encoded by the nucleic acid sequence shown in SEQ ID NO: 167 and a lambda dummy variable light domain 1 (SEQ ID NO: 222) encoded by the nucleic acid sequence shown in SEQ ID NO: 221.
- the monovalent antibody Ka3A3 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 62) encoded by the nucleic acid sequence shown in SEQ ID NO: 61 and a lambda dummy light chain 1 (SEQ ID NO: 110) encoded by the nucleic acid sequence shown in SEQ ID NO: 109.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 62 kappa light chain
- SEQ ID NO: 110 a lambda dummy light chain 1
- the monovalent antibody Ka3A3 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 174) encoded by the nucleic acid sequence shown in SEQ ID NO: 173 and a lambda dummy variable light domain 1 (SEQ ID NO: 222) encoded by the nucleic acid sequence shown in SEQ ID NO: 221.
- the monovalent antibody Ka3G2 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 70) encoded by the nucleic acid sequence shown in SEQ ID NO: 69 and a lambda dummy light chain 1 (SEQ ID NO: 110) encoded by the nucleic acid sequence shown in SEQ ID NO: 109.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 70 kappa light chain
- SEQ ID NO: 110 a lambda dummy light chain 1
- the monovalent antibody Ka3G2 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 182) encoded by the nucleic acid sequence shown in SEQ ID NO: 181 and a lambda dummy variable light domain 1 (SEQ ID NO: 222) encoded by the nucleic acid sequence shown in SEQ ID NO: 221.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 182 a kappa variable light domain
- SEQ ID NO: 222 a lambda dummy variable light domain 1
- the monovalent antibody Ka3H3 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 2,
- SEQ ID NO: 1 a kappa light chain (SEQ ID NO: 60) encoded by the nucleic acid sequence shown in SEQ ID NO: 59 and a lambda dummy light chain 1 (SEQ ID NO: 110) encoded by the nucleic acid sequence shown in SEQ ID NO: 109.
- the monovalent antibody Ka3H3 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 172) encoded by the nucleic acid sequence shown in SEQ ID NO: 171 and a lambda dummy variable light domain 1 (SEQ ID NO: 222) encoded by the nucleic acid sequence shown in SEQ ID NO: 221.
- the monovalent antibody C2 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa dummy light chain 2 (SEQ ID NO: 112) encoded by the nucleic acid sequence shown in SEQ ID NO: 111 and a lambda light chain (SEQ ID NO: 96) encoded by the nucleic acid sequence shown in SEQ ID NO: 95.
- SEQ ID NO: 2 a common heavy chain encoded by the nucleic acid sequence shown in SEQ ID NO: 1
- SEQ ID NO: 112 a kappa dummy light chain 2
- SEQ ID NO: 96 a lambda light chain
- the monovalent antibody C2 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa dummy variable light domain 2 (SEQ ID NO: 224) encoded by the nucleic acid sequence shown in SEQ ID NO: 223 and a lambda variable light domain (SEQ ID NO: 208) encoded by the nucleic acid sequence shown in SEQ ID NO: 207.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 224 encoded by the nucleic acid sequence shown in SEQ ID NO: 223
- a lambda variable light domain SEQ ID NO: 208
- the bispecific antibody 5A3xDl 1 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 4) encoded by the nucleic acid sequence shown in SEQ ID NO: 3 and a lambda light chain (SEQ ID NO: 106) encoded by the nucleic acid sequence shown in SEQ ID NO: 105.
- the bispecific antibody 5A3xDl l includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 116) encoded by the nucleic acid sequence shown in SEQ ID NO: 115 and a lambda variable light domain (SEQ ID NO: 218) encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 116 encoded by the nucleic acid sequence shown in SEQ ID NO: 115
- a lambda variable light domain SEQ ID NO: 2128 encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- the bispecific antibody 5A3-M3xDl l includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ
- SEQ ID NO: 1 a kappa light chain (SEQ ID NO: 8) encoded by the nucleic acid sequence shown in SEQ ID NO: 7 and a lambda light chain (SEQ ID NO: 106) encoded by the nucleic acid sequence shown in SEQ ID NO: 105.
- the bispecific antibody 5A3- M3xDl l includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 120) encoded by the nucleic acid sequence shown in SEQ ID NO: 119 and a lambda variable light domain (SEQ ID NO: 218) encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 120 kappa variable light domain
- SEQ ID NO: 218 encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- the bispecific antibody 5A3-M3xC2 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 8) encoded by the nucleic acid sequence shown in SEQ ID NO: 7 and a lambda light chain (SEQ ID NO: 96) encoded by the nucleic acid sequence shown in SEQ ID NO: 95.
- the bispecific antibody 5A3- M3xC2 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 120) encoded by the nucleic acid sequence shown in SEQ ID NO: 119 and a lambda variable light domain (SEQ ID NO: 208) encoded by the nucleic acid sequence shown in SEQ ID NO: 207.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 120 kappa variable light domain
- SEQ ID NO: 208 encoded by the nucleic acid sequence shown in SEQ ID NO: 207.
- the bispecific antibody 5A3-M5xDl l includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 10) encoded by the nucleic acid sequence shown in SEQ ID NO: 9 and a lambda light chain (SEQ ID NO: 106) encoded by the nucleic acid sequence shown in SEQ ID NO: 105.
- the bispecific antibody 5A3-M5xDl l includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 122) encoded by the nucleic acid sequence shown in SEQ ID NO: 121 and a lambda variable light domain (SEQ ID NO: 218) encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 122 encoded by the nucleic acid sequence shown in SEQ ID NO: 121
- a lambda variable light domain SEQ ID NO: 2128 encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- the bispecific antibody 5A3-M5xC2 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ
- the bispecific antibody in some embodiments, the bispecific antibody is a kappa light chain (SEQ ID NO: 10) encoded by the nucleic acid sequence shown in SEQ ID NO: 9 and a lambda light chain (SEQ ID NO: 96) encoded by the nucleic acid sequence shown in SEQ ID NO: 95.
- the bispecific antibody a kappa light chain (SEQ ID NO: 10) encoded by the nucleic acid sequence shown in SEQ ID NO: 9 and a lambda light chain (SEQ ID NO: 96) encoded by the nucleic acid sequence shown in SEQ ID NO: 95.
- 5A3-M5xC2 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 122) encoded by the nucleic acid sequence shown in SEQ ID NO: 121 and a lambda variable light domain (SEQ ID NO: 208) encoded by the nucleic acid sequence shown in SEQ ID NO: 207.
- the bispecific antibody Ke8xDl l includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 12) encoded by the nucleic acid sequence shown in SEQ ID NO: 11 and a lambda light chain (SEQ ID NO: 106) encoded by the nucleic acid sequence shown in SEQ ID NO: 105.
- the bispecific antibody Ke8xDl l includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 124) encoded by the nucleic acid sequence shown in SEQ ID NO: 123 and a lambda variable light domain (SEQ ID NO: 218) encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- the bispecific antibody Ke8xDl l includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 12) encoded by the nucleic acid sequence shown in SEQ ID NO: 11 and a lambda light chain (SEQ ID NO: 106) encoded by the nucleic acid sequence shown in SEQ ID NO: 105.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 12 a kappa light chain
- SEQ ID NO: 106 encoded by the nucleic acid sequence shown in SEQ ID NO: 105.
- the bispecific antibody Ke8xDl l includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 124) encoded by the nucleic acid sequence shown in SEQ ID NO: 123 and a lambda variable light domain (SEQ ID NO: 218) encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- the bispecific antibody Ke8A2xDl l includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 18) encoded by the nucleic acid sequence shown in SEQ ID NO: 17 and a lambda light chain (SEQ ID NO: 106) encoded by the nucleic acid sequence shown in SEQ ID NO: 105.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 18 kappa light chain
- SEQ ID NO: 106 a lambda light chain
- the bispecific antibody Ke8A2xDl l includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 130) encoded by the nucleic acid sequence shown in SEQ ID NO: 129 and a lambda variable light domain (SEQ ID NO: 218) encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- the bispecific antibody Ke8B2xDl l includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 16) encoded by the nucleic acid sequence shown in SEQ ID NO: 15 and a lambda light chain (SEQ ID NO: 106) encoded by the nucleic acid sequence shown in SEQ ID NO: 105.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 16 kappa light chain
- SEQ ID NO: 106 a lambda light chain
- the bispecific antibody Ke8B2xDl l includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 128) encoded by the nucleic acid sequence shown in SEQ ID NO: 127 and a lambda variable light domain (SEQ ID NO: 218) encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- the bispecific antibody Ke8Gl lxC2 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 46) encoded by the nucleic acid sequence shown in SEQ ID NO: 45 and a lambda light chain (SEQ ID NO: 96) encoded by the nucleic acid sequence shown in SEQ ID NO: 95.
- the bispecific antibody Ke8GxC2 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 158) encoded by the nucleic acid sequence shown in SEQ ID NO: 157 and a lambda variable light domain (SEQ ID NO: 208) encoded by the nucleic acid sequence shown in SEQ ID NO: 207.
- the bispecific antibody Ke8C4xDl l includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 42) encoded by the nucleic acid sequence shown in SEQ ID NO: 41 and a lambda light chain (SEQ ID NO: 106) encoded by the nucleic acid sequence shown in SEQ ID NO: 105.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 42 kappa light chain
- SEQ ID NO: 106 a lambda light chain
- the bispecific antibody Ke8C4xDl l includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 154) encoded by the nucleic acid sequence shown in SEQ ID NO: 153 and a lambda variable light domain (SEQ ID NO: 218) encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- the bispecific antibody Ke8C4xC2 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 42) encoded by the nucleic acid sequence shown in SEQ ID NO: 41 and a lambda light chain (SEQ ID NO: 96) encoded by the nucleic acid sequence shown in SEQ ID NO: 95.
- the bispecific antibody Ke8C4xC2 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 154) encoded by the nucleic acid sequence shown in SEQ ID NO: 153 and a lambda variable light domain (SEQ ID NO: 208) encoded by the nucleic acid sequence shown in SEQ ID NO: 207.
- the bispecific antibody Ke8A3xDl l includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 26) encoded by the nucleic acid sequence shown in SEQ ID NO: 25 and a lambda light chain (SEQ ID NO: 106) encoded by the nucleic acid sequence shown in SEQ ID NO: 105.
- the bispecific antibody Ke8A3xDl l includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 138) encoded by the nucleic acid sequence shown in SEQ ID NO: 137 and a lambda variable light domain (SEQ ID NO: 218) encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 138 kappa variable light domain
- SEQ ID NO: 218 a lambda variable light domain
- the bispecific antibody Ke8A3xC2 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 26) encoded by the nucleic acid sequence shown in SEQ ID NO: 25 and a lambda light chain (SEQ ID NO: 96) encoded by the nucleic acid sequence shown in SEQ ID NO: 95.
- the bispecific antibody Ke8A3xC2 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 138) encoded by the nucleic acid sequence shown in SEQ ID NO: 137 and a lambda variable light domain (SEQ ID NO: 208) encoded by the nucleic acid sequence shown in SEQ ID NO: 207.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 138 kappa variable light domain
- SEQ ID NO: 208 a lambda variable light domain
- the bispecific antibody Ka3xDl l includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 2.
- the bispecific antibody Ka3xDl l includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 168) encoded by the nucleic acid sequence shown in SEQ ID NO: 167and a lambda variable light domain (SEQ ID NO: 218) encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- the bispecific antibody Ka3xC2 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 56) encoded by the nucleic acid sequence shown in SEQ ID NO: 55 and a lambda light chain (SEQ ID NO: 96) encoded by the nucleic acid sequence shown in SEQ ID NO: 95.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 56 kappa light chain
- SEQ ID NO: 96 lambda light chain
- the bispecific antibody Ka3xC2 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 168) encoded by the nucleic acid sequence shown in SEQ ID NO: 167 and a lambda variable light domain (SEQ ID NO: 208) encoded by the nucleic acid sequence shown in SEQ ID NO: 207.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 168 encoded by the nucleic acid sequence shown in SEQ ID NO: 167
- a lambda variable light domain SEQ ID NO: 208 encoded by the nucleic acid sequence shown in SEQ ID NO: 207.
- the bispecific antibody Ka3A3xDl l includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 62) encoded by the nucleic acid sequence shown in SEQ ID NO: 61 and a lambda light chain (SEQ ID NO: 106) encoded by the nucleic acid sequence shown in SEQ ID NO: 105.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 62 kappa light chain
- SEQ ID NO: 106 a lambda light chain
- the bispecific antibody Ka3A3xDl l includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 174) encoded by the nucleic acid sequence shown in SEQ ID NO: 173 and a lambda variable light domain (SEQ ID NO: 218) encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- the bispecific antibody Ka3G2xDl l includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ
- SEQ ID NO: 1 a kappa light chain (SEQ ID NO: 70) encoded by the nucleic acid sequence shown in SEQ ID NO: 69 and a lambda light chain (SEQ ID NO: 106) encoded by the nucleic acid sequence shown in SEQ ID NO: 105.
- the bispecific antibody Ka3G2xDl l includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 182) encoded by the nucleic acid sequence shown in SEQ ID NO: 181 and a lambda variable light domain (SEQ ID NO: 218) encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 182 a kappa variable light domain
- SEQ ID NO: 218 encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- the bispecific antibody Ka3G2xC2 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 70) encoded by the nucleic acid sequence shown in SEQ ID NO: 69 and a lambda light chain (SEQ ID NO: 96) encoded by the nucleic acid sequence shown in SEQ ID NO: 95.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 70 kappa light chain
- SEQ ID NO: 96 lambda light chain
- the bispecific antibody Ka3G2xC2 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 182) encoded by the nucleic acid sequence shown in SEQ ID NO: 181 and a lambda variable light domain (SEQ ID NO: 208) encoded by the nucleic acid sequence shown in SEQ ID NO: 207.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 182 a kappa variable light domain
- SEQ ID NO: 208 encoded by the nucleic acid sequence shown in SEQ ID NO: 207.
- the bispecific antibody Ka3H3xDl l includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 60) encoded by the nucleic acid sequence shown in SEQ ID NO: 59 and a lambda light chain (SEQ ID NO: 106) encoded by the nucleic acid sequence shown in SEQ ID NO: 105.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 60 kappa light chain
- SEQ ID NO: 106 a lambda light chain
- the bispecific antibody Ka3H3xDl l includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 172) encoded by the nucleic acid sequence shown in SEQ ID NO: 171 and a lambda variable light domain (SEQ ID NO: 218) encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 172 a kappa variable light domain
- SEQ ID NO: 218 encoded by the nucleic acid sequence shown in SEQ ID NO: 217.
- the bispecific antibody Ka3H3xC2 includes a common heavy chain (SEQ ID NO: 2) encoded by the nucleic acid sequence shown in SEQ ID NO: 1, a kappa light chain (SEQ ID NO: 60) encoded by the nucleic acid sequence shown in SEQ ID NO: 59 and a lambda light chain (SEQ ID NO: 96) encoded by the nucleic acid sequence shown in SEQ ID NO: 95.
- SEQ ID NO: 2 common heavy chain
- SEQ ID NO: 60 kappa light chain
- SEQ ID NO: 96 lambda light chain
- the bispecific antibody Ka3H3xC2 includes a common variable heavy domain (SEQ ID NO: 114) encoded by the nucleic acid sequence shown in SEQ ID NO: 113, a kappa variable light domain (SEQ ID NO: 172) encoded by the nucleic acid sequence shown in SEQ ID NO: 171 and a lambda variable light domain (SEQ ID NO: 208) encoded by the nucleic acid sequence shown in SEQ ID NO: 207.
- SEQ ID NO: 114 encoded by the nucleic acid sequence shown in SEQ ID NO: 113
- SEQ ID NO: 172 a kappa variable light domain
- SEQ ID NO: 208 encoded by the nucleic acid sequence shown in SEQ ID NO: 207.
- Enzymatic reactions and purification techniques are performed according to manufacturer's specifications or as commonly accomplished in the art or as described herein.
- the foregoing techniques and procedures are generally performed according to conventional methods well known in the art and as described in various general and more specific references that are cited and discussed throughout the present specification. See e.g., Sambrook et al. Molecular Cloning: A Laboratory Manual (2d ed., Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y. (1989)).
- the nomenclatures utilized in connection with, and the laboratory procedures and techniques of, analytical chemistry, synthetic organic chemistry, and medicinal and pharmaceutical chemistry described herein are those well-known and commonly used in the art. Standard techniques are used for chemical syntheses, chemical analyses, pharmaceutical preparation, formulation, and delivery, and treatment of patients.
- the term “antibody” refers to immunoglobulin molecules and immunologically active portions of immunoglobulin (Ig) molecules, i.e., molecules that contain an antigen binding site that specifically binds (immunoreacts with) an antigen.
- immunoglobulin (Ig) molecules i.e., molecules that contain an antigen binding site that specifically binds (immunoreacts with) an antigen.
- specifically bind or “immunoreacts with” or “immunospecifically bind” is meant that the antibody reacts with one or more antigenic determinants of the desired antigen and does not react with other polypeptides or binds at much lower affinity (Ka > 10 "6 ).
- Antibodies include, but are not limited to, polyclonal, monoclonal, chimeric, dAb (domain antibody), single chain, F ab , F ab ' and F (ab')2 fragments, scFvs, and an F ab expression library.
- the basic antibody structural unit is known to comprise a tetramer.
- Each tetramer is composed of two identical pairs of polypeptide chains, each pair having one "light” (about 25 kDa) and one "heavy" chain (about 50-70 kDa).
- the amino-terminal portion of each chain includes a variable region of about 100 to 1 10 or more amino acids primarily responsible for antigen recognition.
- the carboxy-terminal portion of each chain defines a constant region primarily responsible for effector function.
- antibody molecules obtained from humans relate to any of the classes IgG, IgM, IgA, IgE and IgD, which differ from one another by the nature of the heavy chain present in the molecule. Certain classes have subclasses as well, such as IgGi, IgG 2 , and others.
- the light chain may be a kappa chain or a lambda chain.
- the complementarity determining regions (CDRs) of the monoclonal antibody are identical in all the molecules of the population.
- MAbs contain an antigen binding site capable of immunoreacting with a particular epitope of the antigen characterized by a unique binding affinity for it.
- antigen binding site refers to the part of the immunoglobulin molecule that participates in antigen binding.
- the antigen binding site is formed by amino acid residues of the N-terminal variable ("V") regions of the heavy ("H") and light (“L”) chains.
- V N-terminal variable
- H heavy
- L light
- FR framework regions
- the three hypervariable regions of a light chain and the three hypervariable regions of a heavy chain are disposed relative to each other in three dimensional space to form an antigen-binding surface.
- the antigen-binding surface is complementary to the three-dimensional surface of a bound antigen, and the three hypervariable regions of each of the heavy and light chains are referred to as "complementarity-determining regions," or "CDRs.”
- CDRs complementarity-determining regions
- epitopic determinants include any protein determinant capable of specific binding to an immunoglobulin, an scFv, or a T-cell receptor.
- epitopic determinants usually consist of chemically active surface groupings of molecules such as amino acids or sugar side chains and usually have specific three dimensional structural characteristics, as well as specific charge characteristics.
- antibodies may be raised against N-terminal or C-terminal peptides of a polypeptide.
- An antibody is the to specifically bind an antigen when the dissociation constant is ⁇ 1 ⁇ ; e.g., ⁇ 100 nM, preferably ⁇ 10 nM and more preferably ⁇ 1 nM.
- immunological binding refers to the non-covalent interactions of the type which occur between an immunoglobulin molecule and an antigen for which the immunoglobulin is specific.
- the strength, or affinity of immunological binding interactions can be expressed in terms of the dissociation constant (3 ⁇ 4) of the interaction, wherein a smaller Ka represents a greater affinity.
- Immunological binding properties of selected polypeptides can be quantified using methods well known in the art. One such method entails measuring the rates of antigen- binding site/antigen complex formation and dissociation, wherein those rates depend on the concentrations of the complex partners, the affinity of the interaction, and geometric parameters that equally influence the rate in both directions.
- both the "on rate constant” (K, n ) and the “off rate constant” (Ko ff ) can be determined by calculation of the concentrations and the actual rates of association and dissociation. ⁇ See Nature 361 : 186-87 (1993)). The ratio of Ko ff /K, n enables the cancellation of all parameters not related to affinity, and is equal to the dissociation constant Kj. ⁇ See, generally, Davies et al. (1990) Annual Rev Biochem 59:439-473).
- An antibody of the present invention is the to specifically bind to its target, when the equilibrium binding constant (Kj) is ⁇ 1 ⁇ , e.g., ⁇ 100 nM, preferably ⁇ 10 nM, and more preferably ⁇ 1 nM, as measured by assays such as radioligand binding assays or similar assays known to those skilled in the art.
- Kj equilibrium binding constant
- isolated polynucleotide shall mean a polynucleotide of genomic, cDNA, or synthetic origin or some combination thereof, which by virtue of its origin the "isolated polynucleotide” (1) is not associated with all or a portion of a polynucleotide in which the "isolated polynucleotide” is found in nature, (2) is operably linked to a polynucleotide which it is not linked to in nature, or (3) does not occur in nature as part of a larger sequence.
- Polynucleotides in accordance with the invention include the nucleic acid molecules encoding the heavy chain immunoglobulin molecules, and nucleic acid molecules encoding the light chain immunoglobulin molecules described herein.
- isolated protein means a protein of cDNA, recombinant R A, or synthetic origin or some combination thereof, which by virtue of its origin, or source of derivation, the "isolated protein” (1) is not associated with proteins found in nature, (2) is free of other proteins from the same source, e.g., free of marine proteins, (3) is expressed by a cell from a different species, or (4) does not occur in nature.
- polypeptide is used herein as a generic term to refer to native protein, fragments, or analogs of a polypeptide sequence. Hence, native protein fragments, and analogs are species of the polypeptide genus.
- Polypeptides in accordance with the invention comprise the heavy chain immunoglobulin molecules, and the light chain immunoglobulin molecules described herein, as well as antibody molecules formed by combinations comprising the heavy chain immunoglobulin molecules with light chain immunoglobulin molecules, such as kappa light chain immunoglobulin molecules, and vice versa, as well as fragments and analogs thereof.
- naturally-occurring refers to the fact that an object can be found in nature.
- a polypeptide or polynucleotide sequence that is present in an organism (including viruses) that can be isolated from a source in nature and which has not been intentionally modified by man in the laboratory or otherwise is naturally-occurring.
- operably linked refers to positions of components so described are in a relationship permitting them to function in their intended manner.
- a control sequence "operably linked" to a coding sequence is ligated in such a way that expression of the coding sequence is achieved under conditions compatible with the control sequences.
- control sequence refers to polynucleotide sequences which are necessary to effect the expression and processing of coding sequences to which they are ligated. The nature of such control sequences differs depending upon the host organism in prokaryotes, such control sequences generally include promoter, ribosomal binding site, and transcription termination sequence in eukaryotes, generally, such control sequences include promoters and transcription termination sequence.
- control sequences is intended to include, at a minimum, all components whose presence is essential for expression and processing, and can also include additional components whose presence is advantageous, for example, leader sequences and fusion partner sequences.
- polynucleotide as referred to herein means a polymeric boron of nucleotides of at least 10 bases in length, either ribonucleotides or deoxynucleotides or a modified form of either type of nucleotide.
- the term includes single and double stranded forms of DNA.
- Examples of unconventional amino acids include: 4 hydroxyproline, ⁇ -carboxyglutamate, ⁇ - ⁇ , ⁇ , ⁇ - trimethyllysine, ⁇ -N-acetyllysine, O-phosphoserine, N- acetylserine, N-formylmethionine, 3-methylhistidine, 5-hydroxylysine, ⁇ - ⁇ -methylarginine, and other similar amino acids and imino acids (e.g., 4- hydroxyproline).
- the left-hand direction is the amino terminal direction and the right-hand direction is the carboxy-terminal direction, in accordance with standard usage and convention.
- the term "substantial identity” means that two peptide sequences, when optimally aligned, such as by the programs GAP or BESTFIT using default gap weights, share at least 80 percent sequence identity, preferably at least 90 percent sequence identity, more preferably at least 95 percent sequence identity, and most preferably at least 99 percent sequence identity.
- residue positions which are not identical differ by conservative amino acid substitutions.
- Conservative amino acid substitutions refer to the interchangeability of residues having similar side chains.
- a group of amino acids having aliphatic side chains is glycine, alanine, valine, leucine, and isoleucine; a group of amino acids having aliphatic-hydroxyl side chains is serine and threonine; a group of amino acids having amide- containing side chains is asparagine and glutamine; a group of amino acids having aromatic side chains is phenylalanine, tyrosine, and tryptophan; a group of amino acids having basic side chains is lysine, arginine, and histidine; and a group of amino acids having sulfur- containing side chains is cysteine and methionine.
- Preferred conservative amino acids substitution groups are: valine-leucine-isoleucine, phenylalanine-tyrosine, lysine- arginine, alanine valine, glutamic- aspartic, and asparagine-glutamine.
- conservative amino acid replacements are contemplated.
- Conservative replacements are those that take place within a family of amino acids that are related in their side chains.
- amino acids are generally divided into families: (1) acidic amino acids are aspartate, glutamate; (2) basic amino acids are lysine, arginine, histidine; (3) non-polar amino acids are alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, tryptophan, and (4) uncharged polar amino acids are glycine, asparagine, glutamine, cysteine, serine, threonine, tyrosine.
- the hydrophilic amino acids include arginine, asparagine, aspartate, glutamine, glutamate, histidine, lysine, serine, and threonine.
- the hydrophobic amino acids include alanine, cysteine, isoleucine, leucine, methionine, phenylalanine, proline, tryptophan, tyrosine and valine.
- Other families of amino acids include (i) serine and threonine, which are the aliphatic-hydroxy family; (ii) asparagine and glutamine, which are the amide containing family; (iii) alanine, valine, leucine and isoleucine, which are the aliphatic family; and (iv) phenylalanine, tryptophan, and tyrosine, which are the aromatic family.
- Structural and functional domains can be identified by comparison of the nucleotide and/or amino acid sequence data to public or proprietary sequence databases.
- computerized comparison methods are used to identify sequence motifs or predicted protein conformation domains that occur in other proteins of known structure and/or function. Methods to identify protein sequences that fold into a known three-dimensional structure are known. Bowie et al. Science 253: 164 (1991).
- sequence motifs and structural conformations that may be used to define structural and functional domains in accordance with the invention.
- Preferred amino acid substitutions are those which: (1) reduce susceptibility to proteolysis, (2) reduce susceptibility to oxidation, (3) alter binding affinity for forming protein complexes, (4) alter binding affinities, and (4) confer or modify other physico chemical or functional properties of such analogs.
- Analogs can include various muteins of a sequence other than the naturally-occurring peptide sequence. For example, single or multiple amino acid substitutions (preferably conservative amino acid substitutions) may be made in the naturally- occurring sequence (preferably in the portion of the polypeptide outside the domain(s) forming intermolecular contacts.
- a conservative amino acid substitution should not substantially change the structural characteristics of the parent sequence (e.g., a replacement amino acid should not tend to break a helix that occurs in the parent sequence, or disrupt other types of secondary structure that characterizes the parent sequence).
- Examples of art-recognized polypeptide secondary and tertiary structures are described in Proteins, Structures and Molecular Principles (Creighton, Ed., W. H. Freeman and Company, New York (1984)); Introduction to Protein Structure (C. Branden and J. Tooze, eds., Garland Publishing, New York, N.Y. (1991)); and Thornton et at. Nature 354: 105 (1991).
- label refers to incorporation of a detectable marker, e.g., by incorporation of a radiolabeled amino acid or attachment to a polypeptide of biotinyl moieties that can be detected by marked avidin (e.g., streptavidin containing a fluorescent marker or enzymatic activity that can be detected by optical or calorimetric methods). In certain situations, the label or marker can also be therapeutic.
- marked avidin e.g., streptavidin containing a fluorescent marker or enzymatic activity that can be detected by optical or calorimetric methods.
- the label or marker can also be therapeutic.
- labels for polypeptides include, but are not limited to, the following: radioisotopes or radionuclides (e.g., 3 H, 14 C, 15 N, 35 S, 90 Y, 99 Tc, m In, 125 I, 131 I), fluorescent labels (e.g., FITC, rhodamine, lanthanide phosphors), enzymatic labels (e.g., horseradish peroxidase, p-galactosidase, luciferase, alkaline phosphatase), chemiluminescent, biotinyl groups, predetermined polypeptide epitopes recognized by a secondary reporter (e.g., leucine zipper pair sequences, binding sites for secondary antibodies, metal binding domains, epitope tags).
- radioisotopes or radionuclides e.g., 3 H, 14 C, 15 N, 35 S, 90 Y, 99 Tc, m In, 125 I, 131 I
- labels are attached by spacer arms of various lengths to reduce potential steric hindrance.
- pharmaceutical agent or drug refers to a chemical compound or composition capable of inducing a desired therapeutic effect when properly administered to a patient.
- substantially pure means an object species is the predominant species present (i.e., on a molar basis it is more abundant than any other individual species in the composition), and preferably a substantially purified fraction is a composition wherein the object species comprises at least about 50 percent (on a molar basis) of all macromolecular species present.
- a substantially pure composition will comprise more than about
- the object species is purified to essential homogeneity (contaminant species cannot be detected in the composition by conventional detection methods) wherein the composition consists essentially of a single macromolecular species.
- patient includes human and veterinary subjects.
- Antibodies are purified by well-known techniques, such as affinity chromatography using protein A or protein G, which provide primarily the IgG fraction of immune serum. Subsequently, or alternatively, the specific antigen which is the target of the immunoglobulin sought, or an epitope thereof, may be immobilized on a column to purify the immune specific antibody by immuno affinity chromatography. Purification of immunoglobulins is discussed, for example, by D. Wilkinson (The Engineer, published by The Engineer, Inc., Philadelphia PA, Vol. 14, No. 8 (April 17, 2000), pp. 25-28).
- the antibodies of the invention are monoclonal antibodies.
- Monoclonal antibodies are generated, for example, by using the procedures set forth in the Examples provided herein.
- Antibodies are also generated, e.g., by immunizing BALB/c mice with combinations of cell trans fectants expressing high levels of a given target on their surface. Hybridomas resulting from myeloma/B cell fusions are then screened for reactivity to the selected target.
- Monoclonal antibodies are prepared, for example, using hybridoma methods, such as those described by Kohler and Milstein, Nature, 256:495 (1975).
- a hybridoma method a mouse, hamster, or other appropriate host animal, is typically immunized with an immunizing agent to elicit lymphocytes that produce or are capable of producing antibodies that will specifically bind to the immunizing agent.
- the lymphocytes can be immunized in vitro.
- the immunizing agent will typically include the protein antigen, a fragment thereof or a fusion protein thereof.
- peripheral blood lymphocytes are used if cells of human origin are desired, or spleen cells or lymph node cells are used if non- human mammalian sources are desired.
- the lymphocytes are then fused with an immortalized cell line using a suitable fusing agent, such as polyethylene glycol, to form a hybridoma cell (Goding, Monoclonal Antibodies: Principles and Practice. Academic Press, (1986) pp. 59-103).
- Immortalized cell lines are usually transformed mammalian cells, particularly myeloma cells of rodent, bovine and human origin.
- rat or mouse myeloma cell lines are employed.
- the hybridoma cells can be cultured in a suitable culture medium that preferably contains one or more substances that inhibit the growth or survival of the unfused, immortalized cells.
- a suitable culture medium that preferably contains one or more substances that inhibit the growth or survival of the unfused, immortalized cells.
- the culture medium for the hybridomas typically will include hypoxanthine, aminopterin, and thymidine (“HAT medium”), which substances prevent the growth of HGPRT-deficient cells.
- Preferred immortalized cell lines are those that fuse efficiently, support stable high level expression of antibody by the selected antibody-producing cells, and are sensitive to a medium such as HAT medium. More preferred immortalized cell lines are murine myeloma lines, which can be obtained, for instance, from the Salk Institute Cell Distribution Center, San Diego, California and the American Type Culture Collection, Manassas, Virginia. Human myeloma and mouse-human heteromyeloma cell lines also have been described for the production of monoclonal antibodies. ⁇ See Kozbor, J. Immunol, 133:3001 (1984); Brodeur et al, Monoclonal Antibody Production Techniques and Applications, Marcel Dekker, Inc., New York, (1987) pp. 51-63)).
- the culture medium in which the hybridoma cells are cultured can then be assayed for the presence of monoclonal antibodies directed against the antigen.
- the binding specificity of monoclonal antibodies produced by the hybridoma cells is determined by immunoprecipitation or by an in vitro binding assay, such as radioimmunoassay (RIA) or enzyme-linked immuno absorbent assay (ELISA).
- RIA radioimmunoassay
- ELISA enzyme-linked immuno absorbent assay
- the binding affinity of the monoclonal antibody can, for example, be determined by the Scatchard analysis of Munson and Pollard, Anal. Biochem., 107:220 (1980).
- the clones can be subcloned by limiting dilution procedures and grown by standard methods. ⁇ See Goding, Monoclonal Antibodies: Principles and Practice. Academic Press, (1986) pp. 59-103). Suitable culture media for this purpose include, for example, Dulbecco's Modified Eagle's Medium and RPMI-1640 medium. Alternatively, the hybridoma cells can be grown in vivo as ascites in a mammal.
- the monoclonal antibodies secreted by the subclones can be isolated or purified from the culture medium or ascites fluid by conventional immunoglobulin purification procedures such as, for example, protein A-Sepharose, hydroxylapatite chromatography, gel electrophoresis, dialysis, or affinity chromatography.
- Monoclonal antibodies can also be made by recombinant DNA methods, such as those described in U.S. Patent No. 4,816,567.
- DNA encoding the monoclonal antibodies of the invention can be readily isolated and sequenced using conventional procedures ⁇ e.g., by using oligonucleotide probes that are capable of binding specifically to genes encoding the heavy and light chains of murine antibodies).
- the hybridoma cells of the invention serve as a preferred source of such DNA.
- the DNA can be placed into expression vectors, which are then transfected into host cells such as simian COS cells,
- the DNA also can be modified, for example, by substituting the coding sequence for human heavy and light chain constant domains in place of the homologous murine sequences (see U.S. Patent No. 4,816,567; Morrison, Nature 368, 812- 13 (1994)) or by covalently joining to the immunoglobulin coding sequence all or part of the coding sequence for a non-immunoglobulin polypeptide.
- non-immunoglobulin polypeptide can be substituted for the constant domains of an antibody of the invention, or can be substituted for the variable domains of one antigen-combining site of an antibody of the invention to create a chimeric bivalent antibody.
- Monoclonal antibodies of the invention include humanized antibodies or human antibodies. These antibodies are suitable for administration to humans without engendering an immune response by the human against the administered immunoglobulin.
- Humanized forms of antibodies are chimeric immunoglobulins, immunoglobulin chains or fragments thereof (such as Fv, Fab, Fab', F(ab') 2 or other antigen-binding subsequences of antibodies) that are principally comprised of the sequence of a human immunoglobulin, and contain minimal sequence derived from a non-human immunoglobulin. Humanization is performed, e.g., by following the method of Winter and co-workers (Jones et al, Nature,
- Humanized antibodies also comprise, e.g., residues which are found neither in the recipient antibody nor in the imported CDR or framework sequences.
- the humanized antibody includes substantially all of at least one, and typically two, variable domains, in which all or substantially all of the CDR regions correspond to those of a non-human immunoglobulin and all or substantially all of the framework regions are those of a human immunoglobulin consensus sequence.
- the humanized antibody optimally also includes at least a portion of an immunoglobulin constant region (Fc), typically that of a human immunoglobulin (Jones et al, 1986;
- Fully human antibodies are antibody molecules in which the entire sequence of both the light chain and the heavy chain, including the CDRs, arise from human genes.
- Such antibodies are termed “human antibodies”, or “fully human antibodies” herein.
- Monoclonal antibodies can be prepared by using trioma technique; the human B-cell hybridoma technique (see Kozbor, et al, 1983 Immunol Today 4: 72); and the EBV hybridoma technique to produce monoclonal antibodies (see Cole, et al, 1985 In: MONOCLONAL ANTIBODIES AND CANCER THERAPY, Alan R. Liss, Inc., pp. 77-96). Monoclonal antibodies may be utilized and may be produced by using human hybridomas (see Cote, et al, 1983.
- human antibodies can also be produced using additional techniques, including phage display libraries. (See Hoogenboom and Winter, J. Mol. Biol, 227:381 (1991); Marks et al, J. Mol. Biol, 222:581 (1991)).
- human antibodies can be made by introducing 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 rearrangement, assembly, and antibody repertoire. This approach is described, for example, in U.S. Patent Nos.
- Human antibodies may additionally be produced using transgenic nonhuman animals which are modified so as to produce fully human antibodies rather than the animal's endogenous antibodies in response to challenge by an antigen.
- transgenic nonhuman animals which are modified so as to produce fully human antibodies rather than the animal's endogenous antibodies in response to challenge by an antigen.
- the endogenous genes encoding the heavy and light immunoglobulin chains in the nonhuman host have been incapacitated, and active loci encoding human heavy and light chain immunoglobulins are inserted into the host's genome.
- the human genes are incorporated, for example, using yeast artificial chromosomes containing the requisite human DNA segments.
- An animal which provides all the desired modifications is then obtained as progeny by crossbreeding intermediate transgenic animals containing fewer than the full complement of the modifications.
- An example of such a nonhuman animal is a mouse termed the XenomouseTM as disclosed in
- the antibodies can be obtained directly from the animal after immunization with an immunogen of interest, as, for example, a preparation of a polyclonal antibody, or alternatively from immortalized B cells derived from the animal, such as hybridomas producing monoclonal antibodies. Additionally, the genes encoding the immunoglobulins with human variable regions can be recovered and expressed to obtain the antibodies directly, or can be further modified to obtain analogs of antibodies such as, for example, single chain Fv (scFv) molecules.
- scFv single chain Fv
- One method for producing an antibody of interest is disclosed in U.S. Patent No. 5,916,771.
- This method includes introducing an expression vector that contains a nucleotide sequence encoding a heavy chain into one mammalian host cell in culture, introducing an expression vector containing a nucleotide sequence encoding a light chain into another mammalian host cell, and fusing the two cells to form a hybrid cell.
- the hybrid cell expresses an antibody containing the heavy chain and the light chain.
- the antibody can be expressed by a vector containing a DNA segment encoding the single chain antibody described above.
- vectors can include vectors, liposomes, naked DNA, adjuvant-assisted DNA. gene gun, catheters, etc.
- Vectors include chemical conjugates such as described in WO
- 93/64701 which has targeting moiety ⁇ e.g., a ligand to a cellular surface receptor), and a nucleic acid binding moiety ⁇ e.g., polylysine), viral vector ⁇ e.g., a DNA or RNA viral vector), fusion proteins such as described in PCT/US 95/02140 (WO 95/22618) which is a fusion protein containing a target moiety (e.g., an antibody specific for a target cell) and a nucleic acid binding moiety (e.g., a protamine), plasmids, phage, etc.
- the vectors can be chromosomal, non-chromosomal or synthetic.
- Retroviral vectors include moloney murine leukemia viruses.
- DNA viral vectors are preferred.
- These vectors include pox vectors such as orthopox or avipox vectors, herpesvirus vectors such as a herpes simplex I virus (HSV) vector (see Geller, A. I. et al, J. Neurochem, 64:487 (1995); Lim, F., et al, in DNA Cloning: Mammalian Systems, D. Glover, Ed. (Oxford Univ. Press, Oxford England) (1995); Geller, A. I. et al, Proc Natl. Acad. Sci.: U.S.A.
- HSV herpes simplex I virus
- Pox viral vectors introduce the gene into the cells cytoplasm.
- Avipox virus vectors result in only a short term expression of the nucleic acid.
- Adenovirus vectors, adeno-associated virus vectors and herpes simplex virus (HSV) vectors are preferred for introducing the nucleic acid into neural cells.
- the adenovirus vector results in a shorter term expression (about 2 months) than adeno-associated virus (about 4 months), which in turn is shorter than HSV vectors.
- the particular vector chosen will depend upon the target cell and the condition being treated.
- the introduction can be by standard techniques, e.g., infection, transfection, transduction or transformation. Examples of modes of gene transfer include e.g., naked DNA, CaP0 4 precipitation, DEAE dextran, electroporation, protoplast fusion, lipofection, cell microinjection, and viral vectors.
- the vector can be employed to target essentially any desired target cell.
- stereotaxic injection can be used to direct the vectors (e.g., adenovirus, HSV) to a desired location.
- the particles can be delivered by intracerebroventricular (icv) infusion using a minipump infusion system, such as a SynchroMed Infusion System.
- icv intracerebroventricular
- a method based on bulk flow, termed convection has also proven effective at delivering large molecules to extended areas of the brain and may be useful in delivering the vector to the target cell.
- Bispecific antibodies are antibodies that have binding specificities for at least two different antigens. In the present case, one of the binding specificities is for a target such as CD47 or any fragment thereof.
- the second binding target is any other antigen, and advantageously is a cell-surface protein or receptor or receptor subunit.
- Bispecific and/or monovalent antibodies of the invention can be made using any of a variety of art-recognized techniques, including those disclosed in co-pending application WO 2012/023053, filed August 16, 201 1 , the contents of which are hereby incorporated by reference in their entirety.
- the methods described in WO 2012/023053 generate bispecific antibodies that are identical in structure to a human immunoglobulin.
- This type of molecule is composed of two copies of a unique heavy chain polypeptide, a first light chain variable region fused to a constant Kappa domain and second light chain variable region fused to a constant Lambda domain. Each combining site displays a different antigen specificity to which both the heavy and light chain contribute.
- the light chain variable regions can be of the Lambda or Kappa family and are preferably fused to a
- bispecific antibodies of the invention by fusing a Kappa light chain variable domain to a constant Lambda domain for a first specificity and fusing a Lambda light chain variable domain to a constant Kappa domain for the second specificity.
- the bispecific antibodies described in WO 2012/023053 are referred to as IgGKk antibodies or " ⁇ bodies," a new fully human bispecific IgG format.
- This ⁇ -body format allows the affinity purification of a bispecific antibody that is undistinguishable from a standard IgG molecule with characteristics that are undistinguishable from a standard monoclonal antibody and, therefore, favorable as compared to previous formats.
- An essential step of the method is the identification of two antibody Fv regions (each composed by a variable light chain and variable heavy chain domain) having different antigen specificities that share the same heavy chain variable domain. Numerous methods have been described for the generation of monoclonal antibodies and fragments thereof. (See, e.g., Antibodies: A Laboratory Manual, Harlow E, and Lane D, 1988, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY, incorporated herein by reference).
- Fully human antibodies are antibody molecules in which the sequence of both the light chain and the heavy chain, including the CDRs 1 and 2, arise from human genes.
- the CDR3 region can be of human origin or designed by synthetic means.
- Such antibodies are termed "human antibodies", or “fully human antibodies” herein.
- Human monoclonal antibodies can be prepared by using the trioma technique; the human B-cell hybridoma technique (see Kozbor, et al, 1983 Immunol Today 4: 72); and the EBV hybridoma technique to produce human monoclonal antibodies (see Cole, et al, 1985 In: MONOCLONAL ANTIBODIES AND CANCER THERAPY, Alan R. Liss, Inc., pp. 77-96).
- Human monoclonal antibodies may be utilized and may be produced by using human hybridomas (see Cote, et al, 1983. Proc Natl Acad Sci USA 80: 2026-2030) or by transforming human B-cells with Epstein Barr Virus in vitro (see Cole, et al, 1985 In: MONOCLONAL ANTIBODIES AND CANCER THERAPY, Alan R. Liss, Inc., pp. 77-96).
- Monoclonal antibodies are generated, e.g., by immunizing an animal with a target antigen or an immunogenic fragment, derivative or variant thereof.
- the animal is immunized with cells trans fected with a vector containing a nucleic acid molecule encoding the target antigen, such that the target antigen is expressed and associated with the surface of the transfected cells.
- a variety of techniques are well-known in the art for producing xenogenic non- human animals. For example, see U.S. Pat. No. 6,075,181 and
- the antibodies are obtained by screening a library that contains antibody or antigen binding domain sequences for binding to the target antigen.
- This library is prepared, e.g., in bacteriophage as protein or peptide fusions to a bacteriophage coat protein that is expressed on the surface of assembled phage particles and the encoding DNA sequences contained within the phage particles (i.e., "phage displayed library").
- Hybridomas resulting from myeloma/B cell fusions are then screened for reactivity to the target antigen.
- Monoclonal antibodies are prepared, for example, using hybridoma methods, such as those described by Kohler and Milstein, Nature, 256:495 (1975).
- a hybridoma method a mouse, hamster, or other appropriate host animal, is typically immunized with an immunizing agent to elicit lymphocytes that produce or are capable of producing antibodies that will specifically bind to the immunizing agent.
- the lymphocytes can be immunized in vitro.
- antibody libraries containing the same heavy chain variable domain and either a diversity of Lambda variable light chains or Kappa variable light chains can be used in parallel for in vitro selection of antibodies against different antigens.
- This approach enables the identification of two antibodies having a common heavy chain but one carrying a Lambda light chain variable domain and the other a Kappa light chain variable domain that can be used as building blocks for the generation of a bispecific antibody in the full immunoglobulin format of the invention.
- the bispecific antibodies of the invention can be of different Isotypes and their Fc portion can be modified in order to alter the bind properties to different Fc receptors and in this way modify the effectors functions of the antibody as well as it pharmacokinetic properties. Numerous methods for the modification of the Fc portion have been described and are applicable to antibodies of the invention, (see for example Strohl, WR Curr Opin Biotechnol 2009
- the methods of the invention can also be used to generate bispecific antibodies and antibody mixtures in a F(ab')2 format that lacks the Fc portion.
- the common heavy chain and two different light chains are co-expressed into a single cell to allow for the assembly of a bispecific antibody of the invention. If all the polypeptides get expressed at the same level and get assembled equally well to form an immunoglobulin molecule then the ratio of monospecific (same light chains) and bispecific (two different light chains) should be 50%. However, it is likely that different light chains are expressed at different levels and/or do not assemble with the same efficiency. Therefore, a means to modulate the relative expression of the different polypeptides is used to compensate for their intrinsic expression characteristics or different propensities to assemble with the common heavy chain.
- This modulation can be achieved via promoter strength, the use of internal ribosome entry sites (IRES) featuring different efficiencies or other types of regulatory elements that can act at transcriptional or translational levels as well as acting on mRNA stability.
- IRES internal ribosome entry sites
- Different promoters of different strength could include CMV (Immediate-early Cytomegalovirus virus promoter); EFl- ⁇ (Human elongation factor l -subunit promoter); Ubc (Human ubiquitin C promoter); SV40 (Simian virus 40 promoter).
- IRES have also been described from mammalian and viral origin. (See e.g., Hellen CU and Sarnow P. Genes Dev 2001 15: 1593-612).
- IRES can greatly differ in their length and ribosome recruiting efficiency. Furthermore, it is possible to further tune the activity by introducing multiple copies of an IRES (Stephen et al. 2000 Proc Natl Acad Sci USA 97: 1536-1541). The modulation of the expression can also be achieved by multiple sequential transfections of cells to increase the copy number of individual genes expressing one or the other light chain and thus modify their relative expressions. The Examples provided herein demonstrate that controlling the relative expression of the different chains is critical for maximizing the assembly and overall yield of the bispecific antibody.
- the co-expression of the heavy chain and two light chains generates a mixture of three different antibodies into the cell culture supernatant: two monospecific bivalent antibodies and one bispecific bivalent antibody.
- the latter has to be purified from the mixture to obtain the molecule of interest.
- the method described herein greatly facilitates this purification procedure by the use of affinity chromatography media that specifically interact with the Kappa or Lambda light chain constant domains such as the
- antibody variable domains with the desired binding specificities can be fused to immunoglobulin constant domain sequences.
- the fusion preferably is with an immunoglobulin heavy-chain constant domain, comprising at least part of the hinge, CH2, and CH3 regions. It is preferred to have the first heavy-chain constant region (CHI) containing the site necessary for light-chain binding present in at least one of the fusions.
- CHI first heavy-chain constant region
- the interface between a pair of antibody molecules can be engineered to maximize the percentage of heterodimers which are recovered from recombinant cell culture.
- the preferred interface includes at least a part of the CH3 region of an antibody constant domain.
- one or more small amino acid side chains from the interface of the first antibody molecule are replaced with larger side chains (e.g., tyrosine or tryptophan).
- Compensatory "cavities" of identical or similar size to the large side chain(s) are created on the interface of the second antibody molecule by replacing large amino acid side chains with smaller ones (e.g., alanine or threonine). This provides a mechanism for increasing the yield of the heterodimer over other unwanted end-products such as homodimers.
- bispecific antibodies can be prepared using chemical linkage.
- the bispecific antibodies produced can be used as agents for the selective immobilization of enzymes.
- Various techniques for making and isolating bispecific antibody fragments directly from recombinant cell culture have also been described.
- bispecific antibodies have been produced using leucine zippers. Kostelny et al, J. Immunol. 148(5): 1547-1553 (1992).
- the leucine zipper peptides from the Fos and Jun proteins were linked to the Fab' portions of two different antibodies by gene fusion.
- the antibody homodimers were reduced at the hinge region to form monomers and then re-oxidized to form the antibody hetero dimers. This method can also be utilized for the production of antibody homodimers.
- the "diabody” technology described by Hollinger et al, Proc. Natl. Acad. Sci. USA 90:6444-6448 (1993) has provided an alternative mechanism for making bispecific antibody fragments.
- the fragments comprise a heavy-chain variable domain (V H ) connected to a light-chain variable domain (V L ) by a linker which is too short to allow pairing between the two domains on the same chain.
- V H and V L domains of one fragment are forced to pair with the complementary V L and V H domains of another fragment, thereby forming two antigen-binding sites.
- Another strategy for making bispecific antibody fragments by the use of single-chain Fv (sFv) dimers has also been reported. See, Gruber et al, J. Immunol. 152:5368 (1994).
- Antibodies with more than two valencies are contemplated.
- trispecific antibodies can be prepared. Tutt et al, J. Immunol. 147:60 (1991).
- Exemplary bispecific antibodies can bind to two different epitopes, at least one of which originates in the protein antigen of the invention.
- an anti- antigenic arm of an immunoglobulin molecule can be combined with an arm which binds to a triggering molecule on a leukocyte such as a T-cell receptor molecule (e.g., CD2, CD3, CD28, or B7), or Fc receptors for IgG (FcyR), such as FcyRI (CD64), FcyRII (CD32) and FcyRIII (CD 16) so as to focus cellular defense mechanisms to the cell expressing the particular antigen.
- Bispecific antibodies can also be used to direct cytotoxic agents to cells which express a particular antigen.
- antibodies possess an antigen-binding arm and an arm which binds a cytotoxic agent or a radionuclide chelator, such as EOTUBE, DPTA, DOTA, or TETA.
- a cytotoxic agent or a radionuclide chelator such as EOTUBE, DPTA, DOTA, or TETA.
- Another bispecific antibody of interest binds the protein antigen described herein and further binds tissue factor (TF).
- Hetero conjugate antibodies are also within the scope of the present invention. Hetero conjugate antibodies are composed of two covalently joined antibodies.
- Such antibodies have, for example, been proposed to target immune system cells to unwanted cells (see U.S. Patent No. 4,676,980), and for treatment of HIV infection (see WO 91/00360; WO 92/200373; EP 03089). It is contemplated that the antibodies can be prepared in vitro using known methods in synthetic protein chemistry, including those involving crosslinking agents.
- immunotoxins can be constructed using a disulfide exchange reaction or by forming a thioether bond. Examples of suitable reagents for this purpose include iminothiolate and methyl-4-mercaptobutyrimidate and those disclosed, for example, in U.S. Patent No. 4,676,980.
- an antibody of the invention can be modified with respect to effector function, so as to enhance, e.g., the effectiveness of the antibody in treating cancer and/or other diseases and disorders associated with aberrant CD47 expression and/or activity.
- cysteine residue(s) can be introduced into the Fc region, thereby allowing interchain disulfide bond formation in this region.
- the homodimeric antibody thus generated can have improved internalization capability and/or increased complement- mediated cell killing and antibody-dependent cellular cytotoxicity (ADCC).
- ADCC antibody-dependent cellular cytotoxicity
- an antibody can be engineered that has dual Fc regions and can thereby have enhanced complement lysis and ADCC capabilities. (See Stevenson et al, Anti-Cancer Drug Design, 3: 219-230 (1989)).
- the invention also pertains to immuno conjugates comprising an antibody conjugated to a cytotoxic agent such as a toxin (e.g., an enzymatically active toxin of bacterial, fungal, plant, or animal origin, or fragments thereof), or a radioactive isotope (i.e., a radioconjugate).
- a cytotoxic agent such as a toxin (e.g., an enzymatically active toxin of bacterial, fungal, plant, or animal origin, or fragments thereof), or a radioactive isotope (i.e., a radioconjugate).
- Enzymatically active toxins and fragments thereof that can be used include diphtheria A chain, nonbinding active fragments of diphtheria toxin, exotoxin A chain (from Pseudomonas aeruginosa), ricin A chain, abrin A chain, modeccin A chain, alpha-sarcin, Aleurites fordii proteins, dianthin proteins, Phytolaca americana proteins (PAPI, PAPII, and PAP-S), momordica charantia inhibitor, curcin, crotin, sapaonaria officinalis inhibitor, gelonin, mitogellin, restrictocin, phenomycin, enomycin, and the tricothecenes.
- a variety of radionuclides are available for the production of radioconjugated antibodies. Examples include 212 Bi, 131 I, 131 In, 90 Y, and 186 Re.
- Conjugates of the antibody and cytotoxic agent are made using a variety of bifunctional protein-coupling agents such as N-succinimidyl-3-(2-pyridyldithiol) propionate
- SPDP iminothiolane
- imidoesters such as dimethyl adipimidate HCL
- active esters such as disuccinimidyl suberate
- aldehydes such as glutareldehyde
- bis-azido compounds such as bis (p-azidobenzoyl) hexanediamine
- bis- diazonium derivatives such as bis-(p-diazoniumbenzoyl)-ethylenediamine
- diisocyanates such as tolyene 2,6-diisocyanate
- bis-active fluorine compounds such as 1,5-difluoro- 2,4-dinitrobenzene
- a ricin immunotoxin can be prepared as described in Vitetta et al, Science 238: 1098 (1987).
- Carbon- 14-labeled l-isothiocyanatobenzyl-3- methyldiethylene triaminepentaacetic acid (MX-DTPA) is an exemplary chelating agent for conjugation of radionucleotide to the antibody. ⁇ See W094/11026).
- Coupling may be accomplished by any chemical reaction that will bind the two molecules so long as the antibody and the other moiety retain their respective activities.
- This linkage can include many chemical mechanisms, for instance covalent binding, affinity binding, intercalation, coordinate binding and complexation.
- the preferred binding is, however, covalent binding.
- Covalent binding can be achieved either by direct condensation of existing side chains or by the incorporation of external bridging molecules.
- Many bivalent or polyvalent linking agents are useful in coupling protein molecules, such as the antibodies of the present invention, to other molecules.
- representative coupling agents can include organic compounds such as thioesters, carbodiimides, succinimide esters, diisocyanates, glutaraldehyde, diazobenzenes and hexamethylene diamines. This listing is not intended to be exhaustive of the various classes of coupling agents known in the art but, rather, is exemplary of the more common coupling agents. ⁇ See
- linkers include: (i) EDC (l-ethyl-3-(3- dimethylamino -propyl) carbodiimide hydrochloride; (ii) SMPT (4- succinimidyloxycarbonyl-alpha-methyl-alpha-(2-pridyl-dithio)-toluene (Pierce Chem. Co., Cat. (21558G); (iii) SPDP (succinimidyl-6 [3-(2-pyridyldithio) propionamido]hexanoate (Pierce Chem.
- the linkers described above contain components that have different attributes, thus leading to conjugates with differing physio-chemical properties.
- sulfo-NHS esters of alkyl carboxylates are more stable than sulfo-NHS esters of aromatic carboxylates.
- NHS-ester containing linkers are less soluble than sulfo-NHS esters.
- the linker SMPT contains a sterically hindered disulfide bond, and can form conjugates with increased stability.
- Disulfide linkages are in general, less stable than other linkages because the disulfide linkage is cleaved in vitro, resulting in less conjugate available.
- Sulfo-NHS in particular, can enhance the stability of carbodimide couplings.
- Carbodimide couplings (such as EDC) when used in conjunction with sulfo-NHS, forms esters that are more resistant to hydrolysis than the carbodimide coupling reaction alone.
- the antibodies disclosed herein can also be formulated as immunoliposomes.
- Liposomes containing the antibody are prepared by methods known in the art, such as described in Epstein et al, Proc. Natl. Acad. Sci. USA, 82: 3688 (1985); Hwang et al, Proc. Natl Acad. Sci. USA, 77: 4030 (1980); and U.S. Pat. Nos. 4,485,045 and 4,544,545. Liposomes with enhanced circulation time are disclosed in U.S. Patent No. 5,013,556.
- Particularly useful liposomes can be generated by the reverse-phase evaporation method with a lipid composition comprising phosphatidylcholine, cholesterol, and PEG-derivatized phosphatidylethanolamine (PEG-PE). Liposomes are extruded through filters of defined pore size to yield liposomes with the desired diameter.
- Fab' fragments of the antibody of the present invention can be conjugated to the liposomes as described in Martin et al, J. Biol. Chem., 257: 286-288 (1982) via a disulfide-interchange reaction.
- formulations include, for example, powders, pastes, ointments, jellies, waxes, oils, lipids, lipid (cationic or anionic) containing vesicles (such as LipofectinTM), DNA conjugates, anhydrous absorption pastes, oil-in- water and water-in-oil emulsions, emulsions carbowax (polyethylene glycols of various molecular weights), semi-solid gels, and semisolid mixtures containing carbowax. Any of the foregoing mixtures may be appropriate in treatments and therapies in accordance with the present invention, provided that the active ingredient in the formulation is not inactivated by the formulation and the formulation is physiologically compatible and tolerable with the route of administration.
- Therapeutic formulations of the invention are used to treat or alleviate a symptom associated with a cancer, such as, by way of non-limiting example, leukemias, lymphomas, breast cancer, colon cancer, ovarian cancer, bladder cancer, prostate cancer, glioma, lung & bronchial cancer, colorectal cancer, pancreatic cancer, esophageal cancer, liver cancer, urinary bladder cancer, kidney and renal pelvis cancer, oral cavity & pharynx cancer, uterine corpus cancer, and/or melanoma
- a therapeutic regimen is carried out by identifying a subject, e.g., a human patient suffering from (or at risk of developing) a cancer, using standard methods.
- Efficaciousness of treatment is determined in association with any known method for diagnosing or treating the particular immune-related disorder. Alleviation of one or more symptoms of the immune-related disorder indicates that the antibody confers a clinical benefit.
- Methods for the screening of antibodies that possess the desired specificity include, but are not limited to, enzyme linked immunosorbent assay (ELISA) and other immunologically mediated techniques known within the art.
- ELISA enzyme linked immunosorbent assay
- Antibodies directed against a target such as CD47, a tumor associated antigen or other antigen (or a fragment thereof) may be used in methods known within the art relating to the localization and/or quantitation of these targets, e.g., for use in measuring levels of these targets within appropriate physiological samples, for use in diagnostic methods, for use in imaging the protein, and the like).
- antibodies specific any of these targets, or derivative, fragment, analog or homolog thereof, that contain the antibody derived antigen binding domain are utilized as pharmacologically active compounds (referred to hereinafter as "Therapeutics").
- An antibody of the invention can be used to isolate a particular target using standard techniques, such as immuno affinity, chromatography or immunoprecipitation.
- Antibodies of the invention (or a fragment thereof) can be used diagnostically to monitor protein levels in tissue as part of a clinical testing procedure, e.g., to determine the efficacy of a given treatment regimen. Detection can be facilitated by coupling (i.e., physically linking) the antibody to a detectable substance.
- detectable substances include various enzymes, prosthetic groups, fluorescent materials, luminescent materials, bio luminescent materials, and radioactive materials.
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Abstract
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Priority Applications (10)
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CN201380071851.9A CN105121467B (en) | 2012-12-03 | 2013-12-03 | Anti-cd 47 antibody and its application method |
AU2013353763A AU2013353763B2 (en) | 2012-12-03 | 2013-12-03 | Anti-CD47 antibodies and methods of use thereof |
DK13849989.2T DK2925782T3 (en) | 2012-12-03 | 2013-12-03 | ANTI-CD47 ANTIBODIES AND PROCEDURES FOR USE THEREOF |
EP20152992.2A EP3725807A1 (en) | 2012-12-03 | 2013-12-03 | Anti-cd47 antibodies and methods of use thereof |
CA2892585A CA2892585C (en) | 2012-12-03 | 2013-12-03 | Anti-cd47 antibodies and methods of use thereof |
EP13849989.2A EP2925782B1 (en) | 2012-12-03 | 2013-12-03 | Anti-cd47 antibodies and methods of use thereof |
JP2015544559A JP6392770B2 (en) | 2012-12-03 | 2013-12-03 | Anti-CD47 antibody and method of use thereof |
ES13849989T ES2784631T3 (en) | 2012-12-03 | 2013-12-03 | Anti-CD47 antibodies and methods of using them |
RU2015126533A RU2693078C2 (en) | 2012-12-03 | 2013-12-03 | Anti-cd47 antibodies and methods for use thereof |
AU2018220150A AU2018220150B2 (en) | 2012-12-03 | 2018-08-24 | Anti-CD47 Antibodies and Methods of Use Thereof |
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US201261732452P | 2012-12-03 | 2012-12-03 | |
US61/732,452 | 2012-12-03 | ||
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AU (2) | AU2013353763B2 (en) |
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