WO2010104949A2 - Anti-bcma antibodies - Google Patents
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- C07K16/2878—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 NGF-receptor/TNF-receptor superfamily, e.g. CD27, CD30, CD40, CD95
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- C07K2317/732—Antibody-dependent cellular cytotoxicity [ADCC]
Definitions
- This invention relates to antibodies that bind to the B cell surface antigen BCMA.
- the invention also relates to the use of these antibodies to detect, deplete, and otherwise manipulate various B cell subtypes.
- B cells are lymphocytes that play major roles in adaptive humoral immunity and production of antibodies that specifically recognize antigens.
- Three subclasses of B cells are na ⁇ ve B cells, memory B cells, and plasma cells.
- a B cell is said to be specific for an antigen that binds the antibodies made by that B cell.
- B cells in general are stimulated by exposure to their specific antigen (Ag).
- Na ⁇ ve B cells have not yet been exposed to their specific antigen. Such exposure (e.g., during an infection) results in proliferation of B cells and generation of sister clones.
- Sister clones can develop into plasma cells, which produce high amounts of antibody. Plasma cells may either be short lived, or may migrate into bone marrow, where they can persist for an extended period of time.
- a sister clone of an Ag-exposed B cell may also develop into a memory B cell that is quiescent until reexposed to the specific antigen.
- Memory B cells respond rapidly to reexposure to antigen by dividing to produce both plasma cells and additional memory B cells.
- Memory B cells include switched memory B cells (CD19 + CD27 high CD38 low lgD " ), unswitched memory B cells (CD19 + CD27 hi9h CD38 l0W IgD + ), and double negative memory B cells (CD19 + CD27 " CD38 l0W lgD-).
- B cells Malignant transformation of B cells leads to cancers, including some lymphomas such as, for example, multiple myeloma and Hodgkins' Lymphoma. Some autoimmune diseases, including systemic lupus erythematosus (SLE), also involve B cells. Both cancer and autoimmune diseases that involve B cells may be considered gain of function conditions, in that the B cells overgrow and/or attack parts of the body inappropriately. A possible strategy to control such diseases is to use antibodies that target the pathological B cells.
- SLE systemic lupus erythematosus
- BCMA The B cell maturation antigen
- TNFRSF17 and CD269 are proteins that has been shown to be expressed on the surface of plasmablasts (i.e., plasma cell precursors) and plasma cells, and is believed to stimulate survival. It therefore represents a potential target for B cell-related diseases.
- BCMA is a member of the TNF receptor family and binds the TNF family ligands BAFF and APRIL (reviewed in Kalled et al. (2005), Curr Dir Autoimmun 8:206-242).
- BCMA is a type III membrane protein, as it lacks the signal peptide associated with type I membrane proteins found in most TNF receptor family members.
- BCMA RNA has been detected in the spleen, lymph nodes, thymus, adrenals and liver, and analysis of a number of B cell lines indicated that BCMA mRNA levels increased upon maturation.
- Human BCMA protein has been detected on various subtypes of CD38 + B cells, particularly plasma cells (Zhang et al. (2005), lnt Immunol 17:779-788; Darce et al. (2007), J Immunol 179:7276- 7286; Sims et al. (2005), Blood 105:4390-4398; Avery et al. (2003), J Clin Invest 112:286-297).
- BCMA The mechanism of action of BCMA is not fully understood. Mice that have been genetically altered to lack a functional gene for BCMA have normal lymphoid organs and cell populations, and a nearly normal functioning immune system (Xu and Lam (2001), MoI Cell Biol 21:4067-4074; Schiemann et al. (2001), Science 293:2111-2114). The only defect defined to date in these mice is a diminished survival of long-lived bone marrow (BM) plasma cells (O'Connor et al. (2004), J Exp Med 199:91-98). Therefore, it may be that BCMA, at least in the murine system, provides a survival signal to BM-resident plasma cells that is either BAFF or APRIL-mediated, or both.
- BM bone marrow
- the expression of BCMA on the surface of some B cells provides a marker by which those cells may be specifically targeted.
- agents that specifically bind to BCMA and for a determination of which B cell subsets are bound by those BCMA-specific agents.
- the invention provides antibodies that specifically bind to BCMA.
- the antibodies of the invention may be used to target one or more of the following B cell subsets: plasma cells, memory B cells, and na ⁇ ve B cells.
- Figure 1 depicts binding of anti-human BCMA mAbs on BCMA- transfected CHO cells. Binding of biotin-conjugated anti-human BCMA mAbs, visualized with Streptavidin-PE, was measured by flow cytometry on a BCMA- CHO stable cell line (A) and control, non-transfected CHO cells (B). The shaded area represents staining of cells with an isotype control mAb.
- Figure 2 depicts anti-BCMA binding to B cell subsets.
- B cell subsets in human peripheral blood were assessed by flow cytometry for reactivity to anti-BCMA mAbs. Visualization was as in Figure 1. The shaded area represents staining with an isotype control Ab.
- B cell subsets were plasma cells (CD19 + CD27 h ⁇ gh CD38 h ⁇ gh lgD " ) (A), switched memory B cells (CD19 + CD27 high CD38 l0W lgD-) (B), unswitched memory B cells (CD19 + CD27 high CD38 l0W IgD + ) (C), double negative memory B cells (CD19 + CD27 ⁇ CD38 l0W lgD " ) (D), and naive B cells (CD19 + CD271gD + ) (E).
- Figure 3 depicts anti-BCMA binding to B cell subsets isolated from healthy and SLE-afflicted individuals.
- B cell subsets in human peripheral blood from a healthy volunteer and an SLE patient were assessed by flow cytometry for reactivity to the anti-BCMA mAbs C12A3.2 and A7D12.2.
- B cell subsets were as in Figure 2.
- Visualization was as in Figure 1.
- FIG 4 depicts flow cytometric staining of human plasma cells within the human CD45 + splenocyte compartment isolated from HSC/NSG mice. Splenic plasma cells were stained with anti-BCMA antibodies A7D12.2 (left panel; bold line) and C12A3.2 (right panel; bold line) or an isoytpe control mouse lgG2b or IgGI Ab, respectively (thin line in both panels).
- Figure 6 depicts flow cytometric staining for plasma cells (PCs) within the human CD45 + splenocyte compartment isolated from HSC/NSG mice treated with anti-BCMA antibody (chC11 D5.1 or chA7D12.2) or human IgGI control. Mice were injected i.p. with anti-BCMA Ab or HIgGI control twice weekly for 2 weeks. 45 huC13F12.1 H2 humanized mature heavy chain variable domain sequence
- the invention provides antibodies that bind to BCMA and certain epitopes thereof.
- the antibodies of the invention bind to one or more subsets of B cells, such as plasma cells, memory B cells, and na ⁇ ve B cells.
- the invention also provides methods of depleting B cells or subclasses of B cells, including plasma cells, memory B cells, and na ⁇ ve B cells.
- the invention provides an isolated antibody that binds to SEQ ID NO:9 and binds to plasma cells.
- the invention provides an isolated antibody that binds to SEQ ID NO:9 and binds to memory B cells.
- the invention provides an isolated antibody that binds to SEQ ID NO:9 and binds to na ⁇ ve B cells.
- Certain anti-BCMA mAbs including clone C4E2.2 (hamster IgG) generated at Legacy Biogen (6); clone VICKY-1 (rat IgGI) (Alexis Biochemicals, Lausen, Switzerland, also sold as 6D10 by Santa Cruz Biotechnology, Santa Cruz, CA); and clone 335004 (rat lgG2a) (R&D Systems, Inc., Minneapolis, MN), are outside the scope of this invention.
- the invention provides antibodies that bind specifically to SEQ ID NO:9.
- the invention also provides to antibodies that bind to the surface of B cells or subclasses thereof, including plasma cells, memory B cells (including switched, unswitched, and double negative), and/or na ⁇ ve B cells.
- the term "antibody” as used herein, includes both full-length immunoglobulins and antibody fragments that bind to the same antigens.
- the antibodies can be, e.g., a monoclonal, polyclonal, chimeric, humanized, or single chain antibody.
- the antibody fragments are Fab fragments or F(ab')2 fragments and retain the ability to specifically bind the protein of SEQ ID NO: 9.
- the invention provides the antibodies A7D12.2, C11 D5.3, C12A3.2, and C13F12.1. Each of these is a murine monoclonal antibody.
- A7D12.2 has a murine "miscellaneous" subgroup heavy chain, a heavy chain variable domain sequence that is SEQ ID NO:1 , a subgroup I kappa light chain, and a light chain variable domain sequence that is SEQ ID NO:2.
- C11 D5.3 has a subgroup H(A) heavy chain, a heavy chain variable domain sequence that is SEQ ID NO:3, a murine subgroup III kappa light chain, and a light chain variable domain sequence that is selected from SEQ ID NO:4, SEQ ID NO:11 , and SEQ ID NO:12.
- the light chain variable domain sequence of C11 D5.3 is SEQ ID NO: 12.
- C12A3.2 has a subgroup H(A) heavy chain, a heavy chain variable domain sequence that is SEQ ID NO:5, a murine subgroup III kappa light chain, and a light chain variable domain sequence that is SEQ ID NO:6.
- C13F12.1 has a subgroup II(A) heavy chain, a heavy chain variable domain sequence that is SEQ ID NO:7, a murine subgroup III kappa light chain, and a light chain variable domain sequence that is SEQ ID NO:8.
- Techniques for producing single-chain antibodies specific to the protein of SEQ ID NO: 9 can be adapted from e.g., those described in U.S. Patent 4,946,778.
- methods can be adapted for the construction of Fab expression libraries (see e.g., Huse et al. (1989) Science 246:1275-1281) to allow rapid and effective identification of monoclonal Fab fragments with the desired specificity for a BCMA protein or derivatives, fragments, analogs or homologs thereof.
- Numerous techniques for humanizing non-human antibodies are well known in the art. See e.g., U.S. Patent 5,225,539, 6,632,927, or 5,648,237, all of which are incorporated by reference.
- Antibody fragments that contain the idiotypes to a BCMA protein may be produced by any of a variety of techniques, including, but not limited to: (i) an F(ab')2 fragment produced by pepsin digestion of an antibody molecule; (ii) an Fab fragment generated by reducing the disulfide bridges of an F(ab')2 fragment; (iii) a Fab fragment generated by the treatment of the antibody molecule with papain and a reducing agent and (iv) Fv fragments.
- recombinant anti-BCMA antibodies such as chimeric and humanized monoclonal antibodies, comprising both human and non-human portions, which can be made using standard recombinant DNA techniques, are within the scope of the invention.
- Such chimeric and humanized monoclonal antibodies can be produced by recombinant DNA techniques such as, for example, the methods described in U.S. Patent No. 7,112,421 ; Better et al. (1988) Science 240:1041-1043; or Liu et ai. (1987) Proc. Natl. Acad. Sci. USA 84:3439- 3443.
- a chimeric form of A7D12.2 comprises a heavy chain comprising SEQ ID NO:13 and a light chain comprising SEQ ID NO:14.
- a chimeric form of C11 D5.3 comprises a heavy chain comprising SEQ ID NO:15 and a light chain comprising a sequence selected from SEQ ID NO: 16 and SEQ ID NO: 17, preferably SEQ ID NO: 17.
- a chimeric form of C12A3.2 comprises a heavy chain comprising SEQ ID NO:18 and a light chain comprising SEQ ID NO: 19.
- a chimeric form of C13F12.1 comprises a heavy chain comprising SEQ ID NO:20 and a light chain comprising SEQ ID NO:21.
- a humanized form of C11 D5.3 comprises a light chain variable domain comprising a sequence that is at least 80%, at least 85%, at least 90%, at least 95%, or 100% identical to a sequence selected from SEQ ID NOs 22-24 and a heavy chain variable domain sequence comprising a sequence that is at least 80%, at least 85%, at least 90%, at least 95%, or 100% identical to a sequence selected from SEQ ID NOs 25-29.
- a humanized form of C12A3.2 comprises a light chain variable domain comprising a sequence that is at least 80%, at least 85%, at least 90%, at least 95%, or 100% identical to a sequence selected from SEQ ID NOs 30-33 and a heavy chain variable domain sequence comprising a sequence that is at least 80%, at least 85%, at least 90%, at least 95%, or 100% identical to a sequence selected from SEQ ID NOs 34-38.
- a humanized form of C13F12.1 comprises a light chain variable domain comprising a sequence that is at least 80%, at least 85%, at least 90%, at least 95%, or 100% identical to a sequence selected from SEQ ID NOs 39-42 and a heavy chain variable domain sequence comprising a sequence that is at least 80%, at least 85%, at least 90%, at least 95%, or 100% identical to a sequence selected from SEQ ID NOs 43-47.
- the antibodies of the invention may comprise the heavy chain variable domain sequences of SEQ ID NO:1 , SEQ ID NO:3, SEQ ID NO:5, or SEQ ID NO:7.
- the heavy chain variable domain sequences may consist essentially of SEQ ID NO:1 , SEQ ID NO:3, SEQ ID NO:5, or SEQ ID NO:7.
- the antibodies of the invention may comprise the light chain variable domain sequences of SEQ ID NO:2, SEQ ID NO:4, SEQ ID NO:6, SEQ ID NO:8, SEQ ID NO:11 , or SEQ ID NO:12.
- the light chain variable domain sequences may consist essentially of SEQ ID NO:2, SEQ ID NO:4, SEQ ID NO:6, SEQ ID NO:8, SEQ ID NO:11 , or SEQ ID NO:12.
- the invention also provides a variable domain sequence comprising a sequence that is at least 80%, at least 85%, at least 90%, or at least 95% identical to a sequence selected from SEQ ID NO:1 , SEQ ID NO:3, SEQ ID NO:5, and SEQ ID NO:7.
- the invention also provides a variable domain sequence comprising a sequence that is at least 80%, at least 85%, at least 90%, or at least 95% identical to a sequence selected from SEQ ID NO:2, SEQ ID NO:4, SEQ ID NO:6, SEQ ID NO:8, SEQ ID NO:11 , and SEQ ID NO:12.
- the invention also provides antibodies comprising a heavy chain variable domain sequence that is at least 80%, at least 85%, at least 90%, or at least 95% identical to SEQ ID NO:1 and a light chain variable domain sequence that is at least 80%, at least 85%, at least 90%, or at least 95% identical to SEQ ID NO:2.
- the invention includes antibodies comprising a heavy chain variable domain sequence that is at least 80%, at least 85%, at least 90%, or at least 95% identical to SEQ ID NO:3 and a light chain variable domain sequence that is at least 80%, at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 4, SEQ ID NO:11 , or SEQ ID NO: 12.
- the invention includes antibodies comprising a heavy chain variable domain sequence that is at least 80%, at least 85%, at least 90%, or at least 95% identical to SEQ ID NO:5 and a light chain variable domain sequence that is at least 80%, at least 85%, at least 90%, or at least 95% identical to SEQ ID NO:6.
- the invention includes antibodies comprising a heavy chain variable domain sequence that is at least 80%, at least 85%, at least 90%, or at least 95% identical to SEQ ID NO:7 and a light chain variable domain sequence that is at least 80%, at least 85%, at least 90%, or at least 95% identical to SEQ ID NO:8.
- the invention also provides antibodies with particular complementarity determining regions (CDR). Table 2 defines the amino acid coordinates of CDR1 , CDR2, and CDR3 of SEQ ID NOs:1 through 8, 11 , and 12. Table 2. CDR Amino Acid Coordinates
- CDRs are designated using the Kabat definitions (Johnson and Wu (2000), Nucleic Acids Res 28:214-218). As used herein, the "corresponding CDR” means the CDR in the most similar position within the variable domain amino acid sequence.
- the heavy chain variable domain of antibodies of the invention may comprise CDRs such that one, two, or three of the CDRs are identical to the corresponding CDRs of SEQ ID NO:1 ; identical to the corresponding CDRs of SEQ ID NO:3; identical to the corresponding CDRs of SEQ ID NO:5; or identical to the corresponding CDRs of SEQ ID NO:7.
- the light chain variable domain of antibodies of the invention may comprise CDRs such that one, two, or three of the CDRs are identical to the corresponding CDRs of SEQ ID NO:2; identical to the corresponding CDRs of SEQ ID NO:4; identical to the corresponding CDRs of SEQ ID NO:6; identical to the corresponding CDRs of SEQ ID NO:8; identical to the corresponding CDRs of SEQ ID NO:11 ; or identical to the corresponding CDRs of SEQ ID NO:12.
- the heavy chain variable domain may comprise CDRs identical to each of the corresponding CDRs of one of SEQ ID NO:1 , SEQ ID NO:3, SEQ ID NO:5, or SEQ ID NO:7 except that one or more amino acid substitutions have been made in said CDR regions.
- CDRs of the heavy chain variable domain may have up to a total of 12 amino acid substitutions relative to SEQ ID NO:1 , SEQ ID NO:3, SEQ ID NO:5, or SEQ ID NO:7.
- the heavy chain variable domain CDRs of the antibodies of the invention may have up to 10, up to 8, up to 5, or up to 3 substitutions relative to SEQ ID NO:1 , SEQ ID NO:3, SEQ ID NO:5, or SEQ ID NO:7.
- the heavy chain variable domain CDRs of the antibodies of the invention are at least 80%, at least 85%, at least 90%, or at least 95% identical to the heavy chain variable domain CDRs of SEQ ID NO:1 , SEQ ID NO:3, SEQ ID NO:5, or SEQ ID NO:7.
- CDR2 of SEQ ID NO:7 is replaced by CDR2 (i.e., amino acids 50-66) of SEQ ID NO:46.
- the heavy chain variable domain of an antibody of the invention may comprise CDR1 and CDR3 of SEQ ID NO:7 and CDR2 of SEQ ID NO:46.
- the heavy chain variable domain of an antibody of the invention may also comprise CDR1 , CDR2, and CDR3 regions that are together at least 80%, at least 85%, at least 90%, or at least 95% identical to CDR1 and CDR3 of SEQ ID NO:7 and CDR2 of SEQ ID NO:46.
- the light chain variable domain may comprise CDRs identical to the corresponding CDRs of one of SEQ ID NO:2, SEQ ID NO:4, SEQ ID NO:6, SEQ ID NO:8, SEQ ID NO:11 , or SEQ ID NO:12, except for one or more amino acid substitutions in said CDR regions.
- the antibodies of the invention comprise CDRs that are identical to the corresponding CDRs of one Of SEQ ID NO:2, SEQ ID NO:4, SEQ ID NO:6, SEQ ID NO:8, SEQ ID NO:11 , or SEQ ID NO: 12, except for up to 12, up to 10, up to 8, up to 5, or up to 3 amino acid substitutions in said CDR regions.
- the light chain variable domain CDRs of the antibodies of the invention are at least 80%, at least 85%, at least 90%, or at least 95% identical to the light chain variable domain CDRs of SEQ ID NO:2, SEQ ID NO:4, SEQ ID NO:6, SEQ ID NO:8, SEQ ID NO:11 , or SEQ ID NO:12.
- the substitutions in the CDR regions are conservative substitutions.
- the invention also provides antibodies that bind particular epitopes. Whether a pair of antibodies binds the same epitope is determined based on cross-blocking experiments, as described in Example 4. Cross-blocking profiles are defined for seven antibodies in Table 3. For the purposes of this disclosure, two antibodies are considered to bind to the same epitope if each one reduces the other's binding to BCMA (i.e., they mutually cross-block) by at least 90% according to the procedure described in Example 4. Similarly, antibodies that do not reduce each other's binding by at least 90% as described in Example 4 are considered to bind to distinct epitopes.
- the cross-blocking profiles of antibodies with certain variable domains are listed in Table 3. Pairs of antibodies that bind to distinct epitopes (as defined above) are noted with a "d.”
- the invention further encompasses antibodies that bind to the same epitope as antibodies A7D12.2, C11 D5.3, C12A3.2, or C13F12.1.
- the invention also provides antibodies that have cross-blocking profiles that match the profiles of A7D12.2, C11 D5.3, C12A3.2, or C13F12.1.
- an antibody that has the same profile as C11 D5.3 binds to the same epitope as compared to C12A3.2 and C13F12.1 but binds to a distinct epitope as compared to A7D12.2, 335004, C4E2, and Vicky-1.
- the antibodies of the invention mutually cross-block one or more of A7D12.2, C11 D5.3, C12A3.2, or C13F12.1 from binding the protein of SEQ ID NO: 9 by at least 80%, 85%, 90%, or 95%.
- the extent of cross-blocking is measured according to the procedure described in Example 4.
- the antibodies and antibody fragments of the invention bind to the extracellular domain of BCMA.
- the antibodies bind to amino acids 1-52, 1-51 , 1-41 , or 8-41 of SEQ ID NO:9.
- the invention also provides anti-BCMA antibodies that bind to one or more particular types of cell.
- the antibodies or antibody fragments of the invention may bind one or more of the following: plasma cells, memory B cells, na ⁇ ve B cells, or cells that express BCMA (SEQ ID NO:9), a protein similar thereto, the extracellular domain thereof, or a polypeptide similar to the extracellular domain thereof.
- the invention provides methods of depleting various types of cells.
- the methods comprise administering the antibodies of the invention, as described above.
- Types of cells that may be depleted by the methods of the invention include, without limitation, plasma cells, na ⁇ ve B cells, memory B cells (including switched, unswitched, and double negative), lymphoma cells derived from B cells, and cells that express BCMA, a protein similar thereto, the extracellular domain thereof, or a polypeptide similar to the extracellular domain thereof.
- a cell may be in more than one of the foregoing categories.
- antibody- mediated cell depletion methods see "Depletion of B Cells In Vivo by a Chimeric Mouse Human Monoclonal Antibody to CD20", Mitchell E. Reff, Blood, vol. 83, pp. 435-445, Jan. 15, 1994.
- treatment with an antibody of the invention reduces the number of one or more of the above-listed cell types by at least 25%, at least 30%, at least 35%, at least 40%, at least 45%, at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, and least 85%, at least 90%, or at least 95%. In some embodiments, treatment with an antibody of the invention reduces the number of plasma cells by at least 25%, at least 30%, at least 35%, at least 40%, at least 45%, 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, or at least 95%.
- treatment with an antibody of the invention reduces the number of switched memory B cells by at least 25%, at least 30%, at least 35%, at least 40%, at least 45%, at least 50%, or at least 60%. In some embodiments, treatment with an antibody of the invention reduces the number of unswitched memory B cells by at least 25%, at least 30%, at least 35%, at least 40%, at least 45%, at least 50%, or at least 60%. In some embodiments, treatment with an antibody of the invention reduces the number of double negative memory B cells by at least 25%, at least 30%, at least 35%, at least 40%, at least 45%, at least 50%, or at least 60%. In some embodiments, treatment with an antibody of the invention reduces the number of naive B cells by at least 25%, at least 30%, at least 35%, at least 40%, at least 45%, at least 50%, or at least 60%.
- the invention also provides methods of reducing serum immunoglobulin levels comprising administering an antibody of the invention.
- such methods reduce serum IgM levels.
- treatment with an antibody of the invention reduces serum IgM levels by at least 25%, at least 30%, at least 35%, at least 40%, at least 45%, at least 50%, at least 55%, at least 60%, or at least 65%.
- such methods reduce serum IgG levels.
- such methods reduce the levels of one or both of lgG2 and lgG3.
- such methods reduce the levels of lgG2 by at least 25%, at least 30%, at least 35%, at least 40%, at least 50%, at least 60%, at least 65%, or at least 70%. In some embodiments, such methods reduce the levels of lgG3 by at least 25%, at least 30%, at least 35%, at least 40%, at least 50%, at least 60%, at least 65%, at least 70%, at least 75%, or at least 80%. In some embodiments, such methods reduce lgG2, lgG3, and IgM levels.
- the invention also provides methods of reducing the level of at least one autoantibody comprising administering an antibody of the invention.
- such methods reduce the level of one or more autoantibodies by at least 25%, at least 30%, at least 35%, at least 40%, at least 45%, at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, and least 85%, at least 90%, or at least 95%.
- the invention provides methods of treating or preventing or delaying a B-cell mediated condition disorder.
- the method includes administering to a subject in which such treatment or prevention or delay is desired, an antibody of the invention in an amount sufficient to treat, prevent, or delay a tumorigenic or immunoregulatory condition in the subject.
- the subject is a human.
- the subject is a non-human mammal.
- administration of the antibody of the invention blocks BCMA-mediated signalling in the subject, which may result in one or more of cell death, inhibition, reduction, or cessation of cell proliferation.
- the antibodies or antibody fragments of the invention use BCMA to "target" B cell lymphomas.
- targeting can be generalized as follows: antibodies or antibody fragments of the invention specific to the BCMA surface antigen of B cells are, e.g., injected into a subject and specifically bind to the BCMA cell surface antigen of (ostensibly) both normal and malignant B cells; this binding leads to the destruction and/or depletion of neoplastic B cells.
- chemical agents or radioactive labels having the potential to destroy cancer cells and/or tumors can be conjugated to the antibodies or antibody fragments of the invention such that the agent is specifically "delivered" to the targeted B cells, such as, e.g., neoplastic B cells.
- the methods of the invention comprise administering an antibody or antibody fragment that is not conjugated to a chemical agent or radioactive label. In some embodiments, the methods of the invention comprise administering an antibody or antibody fragment that is not conjugated to a cytotoxic agent.
- B cell-related disorders include, without limitation, autoimmune diseases involving inappropriate B cell activity and B cell lymphomas.
- B cell lymphomas include, without limitation, multiple myeloma, plasmacytoma, Hodgkins' lymphoma, follicular lymphomas, small non-cleaved cell lymphomas, endemic Burkitt's lymphoma, sporadic Burkitt's lymphoma, marginal zone lymphoma, extranodal mucosa-associated lymphoid tissue lymphoma, nodal monocytoid B cell lymphoma, splenic lymphoma, mantle cell lymphoma, large cell lymphoma, diffuse mixed cell lymphoma, immunoblastic lymphoma, primary mediastinal B cell lymphoma, pulmonary B cell angiocentric lymphoma, and small lymphocytic lymphoma.
- the antibodies or antibody fragments of the invention may also be used to treat cancers in which the cancer cells express BCMA.
- the B cell-related disorders additionally include B cell proliferations of uncertain malignant potential, such as, for example, lymphomatoid granulomatosis and post-transplant lymphoproliferative disorder.
- the conditions diagnosed, treated, prevented or delayed using the antibodies or antibody fragments of the invention can additionally be an immunoregulatory disorder.
- immunoregulatory disorders include those that are autoimmune in nature such as, for example, systemic lupus erythematosus, rheumatoid arthritis, myasthenia gravis, autoimmune hemolytic anemia, idiopathic thrombocytopenia purpura, anti-phospholipid syndrome, Chagas' disease, Grave's disease, Wegener's granulomatosis, poly-arteritis nodosa, Sjogren's syndrome, pemphigus vulgaris, scleroderma, multiple sclerosis, anti-phospholipid syndrome, ANCA associated vasculitis, Goodpasture's disease, Kawasaki disease, and rapidly progressive glomerulonephritis.
- the antibodies or antibody fragments of the invention may also have application in plasma cell disorders such as heavy- chain disease, primary or immunocyte-associated amyloidosis, and monoclo
- compositions and methods of treatment using the antibodies or antibody fragments of the invention can be used with any condition associated with undesired BCMA-expressing cell proliferation.
- the antibodies of the invention may also be administered in conjunction with antibody C2B8 of US Patent 5,736,137, also known as RITUXANTM.
- combined administration depletes or inhibits the proliferation of multiple B cell subtypes.
- the invention further provides for the use of the antibodies of the invention to assay B cell phenotypes, such as determination of the presence, absence, or amount of a marker on the surface of a B cell or B cell subtype.
- the antibodies of the invention may be used to measure the presence of a marker associated with SLE or another B cell-related condition on the surface of na ⁇ ve B cells, memory B cells, IgD+ memory B cells, IgD- memory B cells, or double negative memory B cells.
- the antibodies of the invention may be used to measure the presence of a marker associated with SLE or another B cell-related condition on the surface of na ⁇ ve B cells, memory B cells, IgD+ memory B cells, IgD- memory B cells, or double negative memory B cells.
- compositions suitable for administration typically comprise antibodies and a pharmaceutically acceptable carrier.
- pharmaceutically acceptable carrier is intended to include any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, diluents, and the like, compatible with pharmaceutical administration. Suitable carriers are described in the most recent edition of Remington's Pharmaceutical Sciences, a standard reference text in the field, which is incorporated herein by reference. Preferred examples of such carriers or diluents include, but are not limited to, water, saline, finger's solutions, dextrose solution, and 5% human serum albumin.
- Liposomes and non-aqueous vehicles such as fixed oils may also be used.
- the use of such media and agents for pharmaceutically active substances is well known in the art. Except insofar as any conventional media or agent is incompatible with the antibodies, use thereof in the compositions is contemplated. Supplementary active compounds can also be incorporated into the compositions.
- a pharmaceutical composition comprising antibodies of the invention is formulated to be compatible with its intended route of administration.
- routes of administration include parenteral, e.g., intravenous, intradermal, subcutaneous, and rectal administration.
- Solutions or suspensions used for parenteral, intradermal, or subcutaneous application can include the following components: a sterile diluent such as water for injection, saline solution, fixed oils, polyethylene glycols, glycerine, propylene glycol or other synthetic solvents; antibacterial agents such as benzyl alcohol or methyl parabens; antioxidants such as ascorbic acid or sodium bisulfite; chelating agents such as ethylenediaminetetraacetic acid (EDTA); buffers such as acetates, citrates or phosphates, and agents for the adjustment of tonicity such as sodium chloride or dextrose.
- the pH can be adjusted with acids or bases, such as hydrochloric acid or sodium hydroxide.
- the parenteral preparation can be
- compositions suitable for injectable use include sterile aqueous solutions (where water soluble) or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion.
- suitable carriers include physiological saline, bacteriostatic water, Cremophor EL (BASF, Parsippany, N.J.) or phosphate buffered saline (PBS).
- the composition must be sterile and should be fluid to the extent that easy syringeability exists. It must be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms such as bacteria and fungi.
- the carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyethylene glycol, and the like), and suitable mixtures thereof.
- the proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants.
- Prevention of the action of microorganisms can be achieved by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, ascorbic acid, thimerosal, and the like.
- isotonic agents for example, sugars, polyalcohols such as mannitol, sorbitol, and sodium chloride in the composition.
- Prolonged absorption of the injectable compositions can be brought about by including in the composition an agent which delays absorption, for example, aluminum monostearate and gelatin.
- Sterile injectable solutions can be prepared by incorporating antibodies of the invention in the required amount in an appropriate solvent with one or a combination of ingredients enumerated above, as required, followed by filtered sterilization.
- dispersions are prepared by incorporating the antibodies into a sterile vehicle that contains a basic dispersion medium and the required other ingredients from those enumerated above.
- methods of preparation are vacuum drying and freeze-drying that yields a powder of the antibodies plus any additional desired ingredient from a previously sterile-filtered solution thereof.
- the antibodies are prepared with carriers that will protect the compound against rapid elimination from the body, such as a controlled release formulation, including implants and microencapsulated delivery systems.
- a controlled release formulation including implants and microencapsulated delivery systems.
- Biodegradable, biocompatible polymers can be used, such as ethylene vinyl acetate, polyanhydrides, polyglycolic acid, collagen, polyorthoesters, and polylactic acid. Methods for preparation of such formulations will be apparent to those skilled in the art.
- the materials can also be obtained commercially from Alza Corporation and Nova Pharmaceuticals, Inc.
- Liposomal suspensions (including liposomes targeted to infected cells with monoclonal antibodies to viral antigens) can also be used as pharmaceutically acceptable carriers.
- the antibodies or antibody fragments of the invention may be used to target liposomal suspensions to B cells or subclasses thereof to which the particular antibody binds. These can be prepared according to methods known to those skilled in the art, for example, as described in U.S. Pat. No. 4,522,811.
- Parenteral compositions may be formulated in dosage unit form for ease of administration and uniformity of dosage. Dosage unit form as used herein refers to physically discrete units suited as unitary dosages for the subject to be treated; each unit containing a predetermined quantity of antibody calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier. The specification for the dosage unit forms of the invention are dictated by and directly dependent on the unique characteristics of the active compound and the particular therapeutic effect to be achieved.
- compositions comprising an antibody of the invention can be included in a container, pack, or dispenser together with instructions for administration.
- a method of depleting na ⁇ ve B cells, memory B cells, and plasma cells comprising administering an antibody that binds to SEQ ID NO:9 and binds to na ⁇ ve B cells, memory B cells, and plasma cells.
- a method of depleting memory B cells comprising administering an antibody that binds to SEQ ID NO:9 and binds to memory B cells.
- a method of depleting na ⁇ ve B cells comprising administering an antibody that binds to SEQ ID NO:9 and binds to na ⁇ ve B cells.
- an isolated antibody that binds to the polypeptide of SEQ ID NO:9, wherein the antibody comprises at least one CDR chosen from CDR1 , CDR2, or CDR3 of a protein sequence selected from the group consisting of SEQ ID NO:1 , SEQ ID NO:3, SEQ ID NO:5, and SEQ ID NO:7.
- the antibody of embodiment 10 wherein the at least one CDR chosen from CDR1 , CDR2, or CDR3 is from SEQ ID NO: 3, and the antibody further comprises a variable domain comprising at least one of a CDR1 region identical to amino acids 24-38 of SEQ ID NO: 12, a CDR2 region identical to amino acids 54- 60 of SEQ ID NO: 12, or a CDR3 region identical to amino acids 93-101 of SEQ ID NO: 12.
- the antibody of embodiment 10 wherein the at least one CDR chosen from CDR1 , CDR2, or CDR3 is from SEQ ID NO: 5, and the antibody further comprises a variable domain comprising at least one of a CDR1 region identical to amino acids 24-38 of SEQ ID NO: 6, a CDR2 region identical to amino acids 54- 60 of SEQ ID NO: 6, or a CDR3 region identical to amino acids 93-101 of SEQ ID NO: 6.
- the at least one CDR chosen from CDR1 , CDR2, or CDR3 is from SEQ ID NO: 7, and the antibody further comprises a variable domain comprising at least one of a CDR1 region identical to amino acids 24-38 of SEQ ID NO: 8, a CDR2 region identical to amino acids 54- 60 of SEQ ID NO: 8, or a CDR3 region identical to amino acids 93-101 of SEQ ID NO: 8.
- an isolated antibody that binds to the polypeptide of SEQ ID NO:9, wherein the antibody comprises: a. a variable domain comprising CDR1 , CDR2, and CDR3 regions identical to the CDR1 , CDR2, and CDR3 of a sequence which is chosen from SEQ ID NO:1 , SEQ ID NO:3, SEQ ID NO:5, or SEQ ID NO:7; or b. a variant of the variable domain of part (a) that is otherwise identical to said variable domain except for up to a total of 10 amino acid substitutions in said CDR regions.
- the antibody of embodiment 53 wherein the sequence is SEQ ID NO:1 and the antibody further comprises: c. a variable domain comprising a CDR1 region identical to amino acids 24-34 of SEQ ID NO:2, a CDR2 region identical to amino acids 50-56 of SEQ ID NO:2, and a CDR3 region identical to amino acids 89-97 of SEQ ID NO:2; or d. a variant of the variable domain of part (c) that is otherwise identical to said variable domain except for up to a total of 10 amino acid substitutions in said CDR regions.
- the antibody of embodiment 53 wherein the sequence is SEQ ID NO:3 and the antibody further comprises: c. a variable domain comprising a CDR1 region identical to amino acids 24-38 of SEQ ID NO: 12, a CDR2 region identical to amino acids 54-60 of SEQ ID NO: 12, and a CDR3 region identical to amino acids 93-101 of SEQ ID NO:12; or d. a variant of the variable domain of part (c) that is otherwise identical to said variable domain except for up to a total of 10 amino acid substitutions in said CDR regions.
- the antibody of embodiment 53 wherein the sequence is SEQ ID NO:5 and the antibody further comprises: c. a variable domain comprising a CDR1 region identical to amino acids 24-38 of SEQ ID NO:6, a CDR2 region identical to amino acids 54-60 of SEQ ID NO:6, and a CDR3 region identical to amino acids 93-101 of SEQ ID NO:6; or d. a variant of the variable domain of part (c) that is otherwise identical to said variable domain except for up to a total of 10 amino acid substitutions in said CDR regions.
- the antibody of embodiment 53 wherein the sequence is SEQ ID NO:7 and the antibody further comprises: c. a variable domain comprising a CDR1 region identical to amino acids 24-38 of SEQ ID NO:8, a CDR2 region identical to amino acids 54-60 of SEQ ID NO:8, and a CDR3 region identical to amino acids 93-101 of SEQ ID NO:8; or d. a variant of the variable domain of part (c) that is otherwise identical to said variable domain except for up to a total of 10 amino acid substitutions in said CDR regions.
- An isolated antibody that binds to the polypeptide of SEQ ID NO:9 wherein the antibody comprises at least one CDR chosen from CDR1 , CDR2, or CDR3 of a protein sequence selected from the group consisting of SEQ ID NO:2, SEQ ID NO:4, SEQ ID NO:6, SEQ ID NO:8; SEQ ID NO:11 ; and SEQ ID NO:12.
- a pharmaceutical composition comprising the antibody of any of embodiments 1-4, 7, 8, 10-21 , or 23-30 and a pharmaceutically acceptable carrier.
- a pharmaceutical composition comprising the antigen binding portion, Fab fragment, or F(ab')2 fragment of embodiment 33 and a pharmaceutically acceptable carrier.
- a method of depleting plasma cells comprising administering the antibody of any of embodiments 1-4, 8, or 10-31.
- a method of treating a B cell-related disorder comprising administering the antibody of any one of embodiments 1-4, 8, or 10-31.
- the B-cell related disorder is plasmacytoma, Hodgkins' lymphoma, follicular lymphomas, small non-cleaved cell lymphomas, endemic Burkitt's lymphoma, sporadic Burkitt's lymphoma, marginal zone lymphoma, extranodal mucosa-associated lymphoid tissue lymphoma , nodal monocytoid B cell lymphoma, splenic lymphoma, mantle cell lymphoma, large cell lymphoma, diffuse mixed cell lymphoma, immunoblastic lymphoma, primary mediastinal B cell lymphoma, pulmonary B cell angiocentric lymphoma, small lymphocytic lymphoma, B cell proliferations of uncertain malignant potential, lymphomatoid granulomatosis, post-transplant lymphoproliferative disorder, an immunoregulatory disorder, rheumatoid arthritis, myasthenia gravis
- the antibody of embodiment 10 wherein the at least one CDR chosen from CDR1 , CDR2, or CDR3 is from SEQ ID NO: 1 , and the antibody further comprises a variable domain comprising at least two of a CDR1 region identical to amino acids 24-34 of SEQ ID NO:2, a CDR2 region identical to amino acids 50-56 of SEQ ID NO:2, or a CDR3 region identical to amino acids 89-97 of SEQ ID NO:2.
- the antibody of embodiment 10 wherein the at least one CDR chosen from CDR1 , CDR2, or CDR3 is from SEQ ID NO: 3, and the antibody further comprises a variable domain comprising at least two of a CDR1 region identical to amino acids 24-38 of SEQ ID NO: 12, a CDR2 region identical to amino acids 54- 60 of SEQ ID NO: 12, or a CDR3 region identical to amino acids 93-101 of SEQ ID NO: 12.
- the antibody of embodiment 10 wherein the at least one CDR chosen from CDR1 , CDR2, or CDR3 is from SEQ ID NO: 5, and the antibody further comprises a variable domain comprising at least two of a CDR1 region identical to amino acids 24-38 of SEQ ID NO: 6, a CDR2 region identical to amino acids 54- 60 of SEQ ID NO: 6, or a CDR3 region identical to amino acids 93-101 of SEQ ID NO: 6. 50.
- the antibody comprises at least two CDRs chosen from CDR1 , CDR2, or CDR3 of SEQ ID NO:5 and at least one CDR chosen from CDR1 , CDR2, or CDR3 of SEQ ID No:6.
- the antibody comprises at least two CDRs chosen from CDR1 , CDR2, or CDR3 of SEQ ID NO:7 and at least one CDR chosen from CDR1 , CDR2, or CDR3 of SEQ ID No:8.
- the antibody of embodiment 10, wherein the antibody comprises at least two CDRs chosen from CDR1 , CDR2, or CDR3 of SEQ ID NO:5 and at least two CDRs chosen from CDR1 , CDR2, or CDR3 of SEQ ID No:6.
- the antibody of embodiment 10, wherein the antibody comprises at least two CDRs chosen from CDR1 , CDR2, or CDR3 of SEQ ID NO:7 and at least two CDRs chosen from CDR1 , CDR2, or CDR3 of SEQ ID No:8.
- the antibody comprises at least two CDRs chosen from CDR1 , CDR2, or CDR3 of SEQ ID NO:3 and CDRs that are CDR1 , CDR2, or CDR3 of SEQ ID No:12.
- the antibody of embodiment 10, wherein the antibody comprises at least two CDRs chosen from CDR1 , CDR2, or CDR3 of SEQ ID NO:5 and CDRs that are CDR1 , CDR2, or CDR3 of SEQ ID No:6.
- the antibody of embodiment 10, wherein the antibody comprises at least two CDRs chosen from CDR1 , CDR2, or CDR3 of SEQ ID NO:7 and CDRs that are CDR1 , CDR2, or CDR3 of SEQ ID No:8.
- a method of reducing serum IgM level comprising administering the antibody of any of embodiments 1-4, 8, and 10-31.
- a method of reducing serum IgG level comprising administering the antibody of any of embodiments 1-4, 8, and 10-31.
- a method of reducing serum lgG2 level comprising administering the antibody of any of embodiments 1-4, 8, and 10-31.
- a method of reducing serum lgG3 level comprising administering the antibody of any of embodiments 1-4, 8, and 10-31.
- the antibody of embodiment 87 wherein the sequence is SEQ ID NO:1 and the antibody further comprises a variable domain comprising CDR1 , CDR2, and CDR3 regions that are together at least 95% identical to the CDR1 , CDR2, and CDR3 regions of SEQ ID NO:2.
- the antibody of embodiment 87 wherein the sequence is SEQ ID NO:3 and the antibody further comprises a variable domain comprising CDR1 , CDR2, and CDR3 regions that are together at least 95% identical to the CDR1 , CDR2, and CDR3 regions of SEQ ID NO:12.
- the antibody of embodiment 87 wherein the sequence is SEQ ID NO:5 and the antibody further comprises a variable domain comprising CDR1 , CDR2, and CDR3 regions that are together at least 95% identical to the CDR1 , CDR2, and CDR3 regions of SEQ ID NO:6.
- the antibody of embodiment 87 wherein the sequence is SEQ ID NO:7 and the antibody further comprises a variable domain comprising CDR1 , CDR2, and CDR3 regions that are together at least 95% identical to the CDR1, CDR2, and CDR3 regions of SEQ ID NO:8.
- the B-cell related disorder is rheumatoid arthritis.
- the B-cell related disorder is idiopathic thrombocytopenia purpura, or myasthenia gravis, or autoimmune hemolytic anemia.
- Anti-BCMA monoclonal antibodies were generated by immunizing female RBF mice with BCMA-Fc/KLH conjugate protein i.p. in CFA, followed by additional immunizations at regular intervals with IFA, except that the last boost used RIBI instead of IFA, prior to splenocyte fusion to the FL653 myeloma cell line after the method of Harlow and Lane (1998), Using Antibodies: A Laboratory Manual: Portable Protocol No. I, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY.
- splenocytes isolated from a mouse 3 days after the final boost were washed twice and mixed in a 7:1 ratio with twice-washed log phase FL653 myeloma cells.
- the cell mixture was split four ways, pelleted, and incubated in 37 0 C PEG for 1 min during which time cells were gently resuspended, followed by careful addition of 10 ml ice-cold DMEM.
- Cells were mixed, pelleted, and resuspended in AAT hybridoma growth selection media. Cell supernatants were screened for BCMA-specific reactivity by ELISA and flow cytometry.
- Total cellular RNA from murine hybridoma cells was prepared using a Qiagen RNeasy mini kit following the manufacturer's recommended protocol.
- cDNAs encoding the variable regions of the heavy and light chains were cloned by RT-PCR from total cellular RNA, using random hexamers for priming of first strand cDNA.
- a cocktail of degenerate forward primers hybridizing to multiple murine immunoglobulin gene family signal sequences and a single back primer specific for the 5' end of the murine constant domain were used.
- PCR was performed using Clontech Advantage 2 Polymerase mix following the manufacturer's recommended protocol.
- DHFR dihydrofolate reductase
- CHO Chinese hamster ovary
- the growth medium was changed to alpha minus MEM (Gibco, Rockville, MD), 10% dialyzed serum (Hyclone, Logan, UT), and 2 mM L- glutamine (Gibco, Rockville, MD), and cells were pooled and split into three T-75 tissue culture flasks and allowed to grow to confluence. Seven days post- transfection, the cells were pooled again and split into five T225 tissue culture flasks and allowed to grow to confluence.
- the highest expressing clone was used for assessing new anti- human BCMA mAbs, with untransfected CHO cells as a control. Briefly, BCMA- CHO cells were pretreated with FACS buffer plus 5% normal mouse serum to block non-specific binding sites. Seven anti-BCMA mAbs — C11 D5.3, C12A3.2, C13F12.1 and A7D12.2 and the commercially available anti-BCMA mAbs, C4E2.2 (Legacy Biogen), VICKY-1 (Alexis) and 335004 (R&D Systems, Inc.)— and isotype control antibodies were incubated separately with cells for 30 minutes on ice at 1 ⁇ g/ml, and washed.
- Biotin-conjugated isotype control Abs were as follows: mouse IgGI , eBioscience cat. no. 13-4714-85; mouse lgG2a, eBioscience, cat. no. 13- 4732-85; hamster IgGI , BD Pharmingen cat. no. 553970; rat lgG2a, eBioscience, cat. No. 13-4321-82.
- Streptavidin-PE (Molecular Probes, Eugene, OR) was added to cells for 30 minutes on ice, after which cells were washed, fixed in 0.8% paraformaldehyde, and run on a FACScalibur flow cytometer (BDbiosciences, San Jose, CA) and analyzed using Flowjo software (Treestar, Ashland, OR). Results are shown in Figure 1.
- Example 3 The seven anti-BCMA mAbs tested in Example 3 were then assessed in a cross-blocking assay to determine the presence or absence of epitope overlap between each antibody.
- Corning 96-well flat-bottom plates were incubated overnight at 4°C with 10 ⁇ g/ml of mouse anti-human Fc in a 50 mM pH 9.6 sodium bicarbonate solution, washed, incubated with 2 ⁇ g/ml human BCMA- Fc (SEQ ID NO:10) at 37°C for 1 hr, washed again, and non-specific binding sites were blocked with blocking buffer (3% BSA in PBS) for 30 min at 37°C.
- Antibodies were considered to bind the same epitope or very closely overlapping epitopes if they each reduced the other's binding (according to the fraction calculated as above) to below 20% of the positive control value. If they did not satisfy this condition, they were considered to have at least partially distinct epitopes. Table 3 shows which antibodies have at least partially distinct epitopes. Example 5. Flow cytometric analysis of antibody binding to human peripheral blood cells
- PBMCs peripheral blood mononuclear cells
- FACS buffer containing 5% normal mouse serum to block non-specific binding sites.
- fluorphore-conjugated monoclonal antibodies directed against specific B cell and plasma cell markers were used: anti-CD19-PE-Cy5, anti-lgD-FITC, anti-CD27-APC, anti-CD38-PE-Cy7 (BD Biosciences, San Jose, CA).
- Streptavidin-PE (Molecular Probes, Eugene, OR) was used to visualize biotin-conjugated anti-BCMA mAbs (10 ⁇ g/ml). Binding of an isotype control mAb as in Example 3 was also measured.
- FIG. 3 shows a comparison between samples from a healthy volunteer and a representative SLE patient.
- Antibody A7D12.2 bound to plasma cells from both healthy volunteers and SLE patients (Fig. 3A).
- the A7D12.2 antibody bound na ⁇ ve B cells (Fig. 3E). Binding of the A7D12.2 antibody to memory B cells (Fig. 3B-D), particularly double negative memory B cells (Fig. 3D), was increased in SLE samples.
- Example 7 Generation of cell lines producing chimeric anti-BCMA mAbs
- CHO-DG44-I a dhfr-deficient, insulin-independent Chinese hamster ovary cell line, was used to construct anti-BCMA wild type cell lines.
- the host cells were cultured in CHO-S-SFM Il medium with nucleosides prior to transfection.
- Chimeric antibodies were produced by transfecting cells with expression plasmids encoding the mature heavy and light chain sequences listed in Table 4.
- Chimeric anti-BCMA expression plasmids were transfected into the CHO host cell line DG44-I using a cationic lipid (Fugene HD) method. Briefly, 1x10 6 DG44-I cells were seeded in each of two wells of a 6-well plate containing 3 ml_ of CHO-S-SFMII medium w/nucleosides per well. Four ⁇ g of plasmid DNA (2 ⁇ g heavy chain, 2 ⁇ g light chain) was diluted into 200 ⁇ l_ CHO-S-SFM Il (Invitrogen) medium at room temperature. Sixteen ⁇ l_ of Fugene HD (Roche) reagent and allowed to complex with the DNA for approximately 15 minutes.
- Fugene HD Fugene HD
- CHO-DG44-I cells stably transfected with chimeric heavy and light chains were fermented in CHOM39 media, harvested, and the cells were removed by centrifugation. The pH of the cleared media was adjusted prior to passing through a protein A Fast Flow column.
- Antibodies were eluted with 100 mM Na- citrate buffer, pH 3.0, neutralized to pH 7.0 using 10% (v/v) of 2M glycine, pH 8.9, and the recovered antibody solution was buffer-exchanged to PBS (pH 7.2) using a Superdex 200 size exclusion chromatography under endotoxin-free conditions. The purified protein was kept at -80 0 C.
- JJN-3 human plasmacytoma cells (DSMZ ACC 541) were cultured in culture medium consisting of 40% Dulbecco's MEM, 40% Iscove's MDM, 20% FBS, 100 units/mL penicillin and 100 ⁇ g/mL streptomycin.
- U266 human plasmacytoma cells (ATCC TIB 196) were cultured in culture medium consisting of RPMI 1640, 15% FBS, 20 mM HEPES, 100 units/mL penicillin and 100 ⁇ g/mL streptomycin. All cells were cultured at 37 0 C in a 5% CO2 atmosphere.
- Peripheral blood mononuclear cells were isolated from a consented normal healthy donor by density centrifugation through Ficoll-Paque PLUS (GE Healthcare, Uppsala, Sweden).
- ADCC antibody-dependent cellular cytotoxicity
- Assay diluent was RPMI 1640, 1% BSA, 20 mM HEPES, 100 units/mL penicillin and 100 ⁇ g/mL streptomycin.
- Human plasmacytoma cell lines JJN-3 and U266 were washed and resuspended in assay diluent to 0.4 x 10 6 cells per ml_. 50 ⁇ l_ of each cell suspension was plated into a 96-well U bottom microtiter plate in triplicates.
- Controls included target cells alone (spontaneous LDH release), target cells alone with 2% Triton X-100 in assay diluent (maximum LDH release), effector cells with and without target cells, and human IgGI isotype control.
- PBMCs peripheral blood mononuclear cells
- chimeric mAbs C12A3.2 and C13F12.1 demonstrated marked ADCC activity relative to HIgGI controls.
- Chimeric clones A7D12.2 and C11 D5.3 also mediated ADCC, although to a lesser degree than C12A3.2 and C13F12.1.
- Table 5 ADCC of U266 cells by anti-human BCMA mAbs
- ADCC assays were also performed using a second BCMA+ plasmacytoma cell line, JJN-3, as the target cells. As shown in Table 6, chimeric C12A3.2, C13F12.1 , and A7D12.2 also mediated ADCC of JJN-3 cells. Table 6. ADCC of JJN-3 cells by anti-human BCMA mAbs
- NK cells were not the effector cells for chC 12A3.2, chC13F12.1 , or chA7D12.2 in the ADCC assays with U266 and JJN3 as target cells (data not shown).
- Generation of afucosyl variants of chC12A3.2, chC13F12.1 , or chA7D12.2 did not improve activity of these mAbs (data not shown).
- HSC/NSG mice provide a useful tool for testing in vivo biologic reagents specific for human protein targets since their immune system consists of functioning human cell types (Brehm et al. (2010), Clin Immunol [Epub ahead of print]). Humanized mice were generated as previously described (Pearson et al. (2008), Curr Protoc Immunol Chapter 15:Unit 15.21. PMID: 18491294). NOD/SCID/common gamma chain-deficient mice (NSG mice) were purchased from Jackson Laboratories (Bar Harbor, ME). Mice were maintained and bred under specific-pathogen-free conditions in isolator cages. Breeding pairs were established and dams were monitored for pregnancy and delivery.
- Pups ranging in age from 2-6 days old were used to create humanized mice. Pups were lightly irradiated, receiving a dose of 1 Gy (100 rad) from a 137Cs irradiator. Pups were immediately injected intra-orbitally with approximately 50,000 CD34+CD3- human stem cells (HSC) derived from umbilical cord blood (All Cell LLC, purchased from StemCell Technologies Inc., Vancouver, BC, Canada), then returned to the dam. Pups were weaned at 21 days and caged with littermates according to gender. Starting at 3 months of age mice were bled via the facial vein into heparinized tubes and the whole blood was analyzed by flow cytometry for the presence of human cells.
- HSC CD34+CD3- human stem cells
- mice were considered successfully humanized if they had at least 20% human CD45+ cells in whole blood of which 10% or more were human CD3+, the remainder being human B cells and other human hematopoietic cells. Mice were occasionally bled and analyzed to ensure that the humanization was stable, and were routinely analyzed 2 weeks prior to study enrollment. Flow cytometry
- PC plasma cells
- HSC/NSG human stem cell humanized NSG mice
- mAbs directed to human cell lineage and to human B cell markers.
- the panel consisted of anti-human CD45, anti-human CD19, anti-human CD27, anti-human IgD, and anti-human CD38.
- Two markers used to exclude specific cell populations were anti-mouse CD45 and anti-human CD3.
- Cells identified as PC were human CD45+, human CD19+, human CD3-, human CD27+, human IgD- and human CD38bright .
- BCMA+ cells the biotin-conjugated anti-human BCMA mAbs, C12A3.2 and A7D12.2, were used.
- mice received chimeric anti-BCMA mAb i.p. Human IgGI with no known reactivity (Protos Immunoresearch) was used as a negative control. Blood was collected to prepare serum for analysis of human Ig isoform levels. At the study terminus the spleen was harvested, a single cell suspension was prepared, RBCs were lysed and cells were washed 3x with PBS/5% FCS and the cell number was determined. Cells were assessed by flow cytometry for T lineage cells, B lineage cells, and plasma cells.
- Serum levels of human IgM and IgG were determined using an ELISA format (Bethyl Laboratories Inc., Montgomery, TX) and a human immunoglobulin isotyping kit (Millipore, Billerica, MA), respectively, according to the manufacturer's protocol. Results
- HSC/NSG mice received various amounts of chimeric anti-human BCMA clones chAC11 D5.3, chC12A3.2, chC13F12.1 , and chA7D12.2 (Example 7) twice weekly i.p. for 2 weeks, after which the presence of splenic PCs was determined.
- Splenic PCs from the HIgGI -treated control group were analyzed for expression of BCMA using the A7D12.2 and C12A3.2 clones and were confirmed to express cell surface BCMA (data not shown).
- PCs were identified using the flow cytometric parameters described above, and total cell numbers were determined from the flow cytometric dot plots (calculated as a percentage of the total human cell number). The numbers of naive human B cells, unswitched memory human B cells, and switched memory human B cells were also determined.
- Chimeric C12A3.2 resulted in a 63%, 62% and 30% reduction in IgM for the 200, 20 and 2 ⁇ g dose levels, respectively.
- Chimeric C13F12.1 resulted in a 52%, 42% and 32% reduction in IgM for the 200, 20 and 2 ⁇ g dose levels, respectively.
- Table 7 Serum human IgM levels ( ⁇ g/mL)
- Table 8 Serum human immunoglobulin levels
Abstract
Description
Claims
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CN201080020559.0A CN102421801B (en) | 2009-03-10 | 2010-03-10 | Anti-BCMA antibody |
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