WO2011014438A1 - Fully human antibodies to btla - Google Patents
Fully human antibodies to btla Download PDFInfo
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- WO2011014438A1 WO2011014438A1 PCT/US2010/043182 US2010043182W WO2011014438A1 WO 2011014438 A1 WO2011014438 A1 WO 2011014438A1 US 2010043182 W US2010043182 W US 2010043182W WO 2011014438 A1 WO2011014438 A1 WO 2011014438A1
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- antibody
- btla
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- 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 present invention relates generally to antibodies or antigen binding fragments that bind to BTLA and uses thereof. More specifically, the invention relates to fully human antibodies that recognize human BTLA and modulate its activity, particularly in inflammatory, autoimmune and proliferative disorders.
- the immune system functions to protect individuals from infectious agents, e.g., bacteria, multi-cellular organisms, and viruses, as well as from cancers.
- This system includes several types of lymphoid and myeloid cells such as monocytes, macrophages, dendritic cells (DCs), eosinophils, T cells, B cells, and neutrophils. These lymphoid and myeloid cells often produce signaling proteins known as cytokines.
- the immune response includes inflammation, i.e., the accumulation of immune cells systemically or in a particular location of the body. In response to an infective agent or foreign substance, immune cells secrete cytokines which, in turn, modulate immune cell proliferation, development, differentiation, or migration.
- Immune responses can produce pathological consequences, e.g., when it involves excessive inflammation, as in the autoimmune disorders (see, e.g., Abbas et al. (eds.) (2000) Cellular and Molecular Immunology, W.B. Saunders Co., Philadelphia, PA; Oppenheim and Feldmann (eds.) (2001) Cytokine Reference, Academic Press, San Diego, CA; von Andrian and Mackay (2000) New Engl. J. Med. 343:1020-1034; Davidson and Diamond (2001) New Engl. J. Med. 345:340-350).
- Positive and negative co-stimulatory signals play critical roles in the modulation of B and T cell activity, and the molecules that mediate these signals have proven to be effective targets for immunomodulatory agents.
- Positive co-stimulation in addition to T cell receptor (TCR) engagement, is required for optimal activation of naive T cells, whereas negative co-stimulation is believed to be required for the acquisition of immunologic tolerance to self, as well as the termination of effector T cell functions.
- TCR T cell receptor
- CD28 the prototypic T cell costimulatory molecule, emits signals that promote T cell proliferation and differentiation in response to TCR engagement, while the CD28 homologue cytotoxic T lymphocyte antigen-4
- CTLA-4 mediates inhibition of T cell proliferation and effector functions
- B7-DC Tseng et al, J. Exp. Med., 193, 839-46, 2001
- PD-I programmed death 1
- T cells are reported to enhance proliferation of CD4+ T helper (Th) cells and CD8+ cytotoxic T lymphocytes (CTLs or Tcs) and selectively enhance IFN- ⁇ expression (Chapoval et al, Nat. Immunol, 2, 269-74, 2001; Sun et al, J. Immunol., 168, 6294-7, 2002).
- Th CD4+ T helper
- CTLs or Tcs cytotoxic T lymphocytes
- CTLs and CD4+ Th cells find use in the modulation of immune responses, and are highly desirable.
- autoimmune disorders are known to involve autoreactive T cells and autoantibodies.
- Agents that are capable of inhibiting or eliminating autoreactive lymphocytes without compromising the immune system's ability to defend against pathogens are highly desirable.
- cancer immunotherapies such as adoptive immunotherapy, expand tumor-specific T cell populations and direct them to attack and kill tumor cells (Dudley et al, Science 298:850-854, 2002; Pardoll, Nature Biotech.,20: 1207-1208, 2002; Egen et al, Nature Immunol., 3:611-618, 2002). Agents capable of augmenting tumor attack are also highly desirable.
- immune responses directed against different antigens are frequently of insufficient magnitude to afford protection against a disease process mediated by agents (e.g., infectious microorganisms or tumor cells) expressing those antigens. It is often desirable to administer to the subject, in conjunction with the antigen, an adjuvant that serves to enhance the immune response to the antigen in the subject.
- Costimulatory signals particularly positive costimulatory signals, also play a role in the modulation of B cell activity.
- B cell activation and the survival of germinal center B cells require T cell-derived signals in addition to stimulation by antigen.
- CD40 ligand present on the surface of helper T cells interacts with CD40 on the surface of B cells, and mediates many such T-cell dependent effects in B cells.
- the protein BTLA (B and T lymphocyte attenuator) is a member of the CD28 family of receptors that also includes CD28, CTLA-4, ICOS, and PD-I.
- BTLA was discovered through screening for differential expression in THl cells.
- BTLA has been described as providing negative inhibitory signals, analogous to CTLA-4.
- anti-BTLA Mab In the presence of agonist anti-BTLA Mab, anti-CD3 and anti-CD28 activated T-cells show reduced IL-2 production and proliferation (Kreig et al., J. Immunol., 175, 6420-6472, 2005).
- Mice lacking an intact BTLA gene show higher titers to DNP-KLH post-immunization and an increased sensitivity to EAE (Watanabe et al, Nat. Immunol, 4, 670-679, 2003).
- HVEM herpes virus entry mediator
- agents that recognize BTLA in particular antibodies and binding agents thereof that recognize BTLA, and methods of using such agents, are desired.
- Antibodies can be used as therapeutic agents. Certain antibodies when used as a therapeutic agent in vivo can cause undesired immunogenicity of the antibodies. As most monoclonal antibodies are derived from rodents, repeated use in humans results in the generation of an immune response against the therapeutic antibody, e.g., human against mouse antibodies or HAMA. Such an immune response results in a loss of therapeutic efficacy at a minimum and a potential fatal anaphylactic response at a maximum.
- One approach for reducing the immunogenicity of rodent antibodies involves the production of chimeric antibodies, in which mouse variable regions (Fv) were fused with human constant regions (Liu et al. (1987) Proc. Natl. Acad. ScL USA 84:3439-43). However, mice injected with hybrids of human variable regions and mouse constant regions develop a strong anti-antibody response directed against the human variable region, suggesting that the retention of the entire rodent Fv region in such chimeric antibodies may still result in unwanted immunogenicity in patients.
- CDR complementarity determining region
- anti-BTLA antibodies and in particular anti-BTLA monoclonal antibodies, for use in treatment of human disorders, such as inflammatory, autoimmune, and proliferative disorders.
- Such antibodies will preferably exhibit low immunogenicity in human subjects, allowing for repeated administration without adverse immune responses.
- the present invention relates to anti-human BTLA antibodies having one or more desirable properties, including high binding affinities, neutralizing activities, good pharmacokinetics and low antigenicity in human subjects.
- the invention also relates to use of the antibodies of the present invention in the treatment of disease.
- the invention relates to an isolated antibody or antigen binding fragment thereof which binds to human B and T lymphocyte attenuator (BTLA), comprising one or more properties selected from the group consisting of: a) does not block binding of BTLA to herpes virus entry mediator (HVEM); b) cross reacts with cynomolgus BTLA; c) exhibits a K D for binding to human BTLA of at most about 2.4 X 10 "9 ; and d) exhibits an EC 50 of from about 10-100 nM in an in in vitro assay measuring B or T cell activation.
- HVEM herpes virus entry mediator
- the invention relates to an isolated antibody or antigen binding fragment thereof which binds to human BTLA, comprising one of more properties selected from the group consisting of: a) blocks binding of BTLA to HVEM; b) cross reacts with cynomolgus BTLA; and c) exhibits a K D for binding to human BTLA of at most about 4.6 X 10 "9 .
- the invention relates to an isolated agonist antibody or antigen binding fragment thereof which binds BTLA selected from the group consisting of hu Mab8D5 and hu Mab8A3, wherein the antibody specifically binds BTLA and does not block binding to HVEM.
- the invention relates to an isolated agonist antibody or antigen binding fragment thereof which binds BTLA selected from the group consisting of hu Mab21H6 hu and Mabl9A7, wherein the antibody specifically binds BTLA and also blocks binding to HVEM.
- the invention relates to an isolated antibody or antigen binding fragment thereof which binds BTLA comprising at least one V L CDR domain selected from the group consisting of SEQ ID Nos.:12, 13, and 14 and at least one V H CDR domain selected from the group consisting of SEQ ID Nos.: 5, 6, and 7.
- the invention relates to an isolated antagonist antibody or antigen binding fragment thereof which binds BTLA, comprising at least one V L CDR domain selected from the group consisting of SEQ ID Nos.:26, 27, 28, and at least one V H CDR domain selected from the group consisting of SEQ ID Nos.: 19, 20, and 21.
- the invention relates to an isolated antibody or antigen binding fragment thereof, comprising a heavy chain variable region and a light chain variable region, wherein: (a) the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 11 (8D5 heavy chain); and (b) the light chain variable region comprises the amino acid sequence of SEQ ID NO: 18 (8D5 light chain).
- the invention relates to an isolated antibody or antigen binding fragment thereof, comprising: (a) a heavy chain variable region CDRl comprising the amino acid sequence of SEQ ID NO:5 (8D5 HCDRl); (b) a heavy chain variable region CDR2 comprising the amino acid sequence of SEQ ID NO:6 (8D5 HCDR2); (c) a heavy chain variable region CDR3 comprising the amino acid sequence of SEQ ID NO:7 (8D5 HCDR3); (d) a light chain variable region CDRl comprising the amino acid sequence of SEQ ID NO: 12(8D5 LCDRl); (e) a light chain variable region CDR2 comprising the amino acid sequence of SEQ ID NO: 13 (8D5 LCDR2); and (f) a light chain variable region CDR3 comprising the amino acid sequence of SEQ ID NO: 14(8D5 LCDR3); wherein the antibody specifically binds BTLA and does not block binding to HVEM.
- a heavy chain variable region CDRl comprising the amino acid sequence
- the invention relates to an isolated antibody or antigen binding fragment thereof, comprising: (a) a heavy chain variable region that is the product of or derived from a human VH gene (SEQ ID NO:8) [encoding 8D5]; and (b) a light chain variable region that is the product of or derived from a human VK gene (SEQ ID NO: 15) [encoding 8D5]; wherein the antibody specifically binds BTLA.
- the invention relates to an isolated antibody or antigen binding fragment thereof, wherein the antibody cross-competes for binding to BTLA with a reference antibody that comprises: (a) the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 9 or SEQ ID NO: 11 (8D5 heavy chain); (b) the light chain variable region comprises the amino acid sequence of SEQ ID NO: 16 or SEQ ID NO: 18 (8D5 light chain); wherein the isolated monoclonal antibody, or antigen-fragment thereof, is a BTLA agonist.
- the heavy chain and light chain are connected by a flexible linker to form a single-chain antibody.
- the antibody or antigen binding fragment is a single- chain Fv antibody. In certain embodiments, the antibody or antigen binding fragment is a Fab antibody. In certain embodiments, the antibody or antigen binding fragment is a Fab' antibody. In certain embodiments, the antibody or antigen binding fragment is a (Fab') 2 antibody. [0033] In certain embodiments, the antibody or antigen binding fragment is a fully human monoclonal or recombinant antibody.
- the antibody or antigen binding fragment decreases
- the antibody or antigen binding fragment increases
- the invention relates to an isolated polypeptide comprising the V L domains or the V 11 domains of any of the antibodies or antigen binding fragments described herein.
- the invention relates to an isolated nucleic acid encoding the V L domains or the V H domains of any of the antibodies or antigen binding fragments described herein.
- the invention relates to a composition
- a composition comprising one or more antibodies or antigen binding fragments as described herein and a pharmaceutically acceptable carrier or diluent.
- the invention relates to a method of treating a condition caused by decreased expression and/or activity of BTLA in a subject, comprising administering to the subject an effective amount of the pharmaceutical composition as described herein.
- any disease or disorder marked by the presence or activity of T or B cells can be treated by a BTLA agonist antibody (Le., a disease or disorder that involves the presence of BTLA positive immune cells can be managed or treated by activating BTLA receptor function).
- the one or more antibodies or antigen binding fragment thereof is selected from the group consisting of hu Mab8D5, hu Mab8A3, hu
- the invention relates to a method of treating an inflammatory or autoimmune disorder in a subject comprising administering an effective amount of the antibody or antigen binding fragments as described herein to the subject.
- the inflammatory or autoimmune disorder is selected from the group consisting of inflammatory bowel disorders (e.g., Crohn's disease, ulcerative colitis, and inflammatory bowel disease), inflammatory fibrosis (e.g., scleroderma, lung fibrosis, and cirrhosis), rheumatoid arthritis (RA), osteoarthritis, osteoporosis, asthma (including allergic asthma), allergies, chronic obstructive pulmonary disease (COPD), multiple sclerosis, psoriasis, uveitis, graft versus host disease (GVHD), juvenile early-onset Type I diabetes, transplant rejection, SLE, and Sjogren's syndrome.
- Such methods of treatment may further comprise administering one or more additional therapeutic agents, such as immunosuppressive or
- the inflammatory bowel disorder is selected from the group consisting of Crohn's disease, ulcerative colitis, and inflammatory bowel disease.
- the invention relates to a method of treating transplant rejection and/or graft-versus-host disease.
- the invention relates to a method of treating diabetes type I.
- the invention relates to the use of the antibody or antigen binding fragment as described herein for the preparation of a medicament to treat an inflammatory or autoimmune disorder in a subject.
- the invention relates to the use of the antibody or antigen binding fragment as described herein for the preparation of a medicament to decrease the activity of BTLA.
- the invention relates to a method of increasing the immune response in a subject comprising administering an effective amount of the pharmaceutical composition to the subject.
- the one or more antibodies or antigen binding fragment thereof is hu Mab4C7.
- the invention relates to the use of an antagonist antibody as described herein for the preparation of a medicament to increase the activity of
- the invention relates to the use of any of the antibody or antibody fragments described herein for diagnostic use.
- the invention relates to a kit comprising any of the antibodies of or antigen binding fragments described herein.
- the invention relates to a complex comprising
- BTLA and any one of the antibody or antigen binding fragments described herein.
- the invention relates to an expression vector comprising the isolated nucleic acid encoding a polypeptide encoding any of the VH or VL chains described herein.
- the invention relates to host cell comprising the expression vector described herein.
- the invention relates to a method of producing the antibody of antigen binding fragment thereof as described herein comprising:
- the invention relates to an isolated antibody or antigen binding fragment thereof, wherein the antibody cross-competes for binding to BTLA with a reference antibody that comprises:
- the heavy chain variable region comprises the amino acid sequence of SEQ
- the light chain variable region comprises the amino acid sequence of SEQ
- ID NO:30 (4C7 light chain); wherein the isolated monoclonal antibody, or antigen-fragment thereof, is a BTLA antagonist.
- the invention relates to an isolated nucleic acid encoding an immunoglobulin polypeptide comprising CDR-Ll, CDR-L2 and CDR-L3 found in a light chain variable region that comprises the amino acid sequence set forth in SEQ ID NO:
- the invention relates to an isolated immunoglobulin polypeptide comprising CDR-Ll, CDR-L2 and CDR-L3 found in a light chain variable region that comprises the amino acid sequence set forth in SEQ ID NO: 18.
- the invention relates to an isolated nucleic acid encoding an immunoglobulin polypeptide comprising CDR-Hl, CDR-H2 and CDR-H3 found in a heavy chain variable region that comprises the amino acid sequence set forth in SEQ ID NO:
- the invention relates to an isolated immunoglobulin polypeptide comprising CDR-Hl, CDR-H2 and CDR-H3 found in a heavy chain variable region that comprises the amino acid sequence set forth in SEQ ID NO:11.
- the invention relates to an isolated nucleic acid encoding an immunoglobulin polypeptide comprising CDR-Ll, CDR-L2 and CDR-L3 found in a light chain variable region that comprises the amino acid sequence set forth in SEQ ID NO: 1
- the invention relates to an isolated immunoglobulin polypeptide comprising CDR-Ll, CDR-L2 and CDR-L3 found in a light chain variable region that comprises the amino acid sequence set forth in SEQ ID NO:32.
- the invention relates to an isolated nucleic acid encoding an immunoglobulin polypeptide comprising CDR-Hl, CDR-H2 and CDR-H3 found in a heavy chain variable region that comprises the amino acid sequence set forth in SEQ ID NO: 25.
- the invention relates to an isolated immunoglobulin polypeptide comprising CDR-Hl, CDR-H2 and CDR-H3 found in a heavy chain variable region that comprises the amino acid sequence set forth in SEQ ID NO:25.
- these nucleic acid constructs and/or polypeptides are useful in methods of making an antibody.
- Figures IA-C show the sequences of the heavy and light chain variable regions of hu Mab 8D5.
- Figure IA shows the mature amino acid sequence of VH chain and the encoding nucleic acid sequence. The CDRl, CDR2, and CDR3 sequences are indicated with waved lines above the amino acid sequence.
- Figure IB shows the mature amino acid sequence of the VL chain and the encoding nucleic acid sequence. The CDRl, CDR2, and CDR3 sequences are indicated with waved lines above the amino acid sequence.
- Figure 1C shows sequence features of the heavy and light chain variable regions of Hu Mab8D5.
- Figures 2A-C show the sequences of the heavy and light chain variable regions of hu Mab 4C7.
- Figure 2A shows the mature amino acid sequence of VH chain and the encoding nucleic acid sequence. The CDRl, CDR2, and CDR3 sequences are indicated with waved lines above the amino acid sequence.
- Figure 2B shows the mature amino acid sequence of the VK and the encoding nucleic acid sequence. The CDRl, CDR2, and CDR3 sequences are indicated with waved lines above the amino acid sequence.
- Figure 2C shows sequence features of the heavy and light chain variable regions of hu Mab4C7.
- Figures 3A-D show binding and cross reactivity features of hu Mab8D5 and hu
- FIG. 3 A shows the binding profile of hu Mab8D5 for human BTLA expressed on CHO cells.
- Figure 3B shows the binding profile of hu Mab8D5 for cyno BTLA expressed on CHO cells.
- Figure 3C shows the binding profile of hu Mab4C7 for human BTLA expressed on CHO cells.
- Figure 3D shows the binding profile of hu Mab4C7 for cyno BTLA expressed on CHO cells.
- Figures 4A-B show the results of testing the ability of the antibodies to block human HVEM binding to CHO cells expressing human BTLA.
- Figure 4A shows that hu
- Mab4C7 blocks human HVEM binding to CHO cells expressing human BTLA.
- Figure 4B shows that hu Mab8D5 fails to block human HVEM binding to CHO cells expressing human
- Figure 5 is a graph showing that hu Mab8D5, as well as hu Mab8D5 Fab' fragment, inhibits anti-CD3 induced proliferation of human T cell blasts.
- Figures 6A-D are graphs showing the effects of hu Mab8D5 and hu Mab4C7 on
- Figures 7A-B are graphs showing that human recall T cell response to tetanus toxoid challenge is decreased by hu Mab8D5.
- Figures 8A-B are graphs showing that human recall T cell response to tetanus toxoid challenge is increased by hu Mab4C7.
- Figure 9 is a graph showing that human B cell function is inhibited by hu
- Figures 1OA -B are graphs showing the inhibition of peripheral blood B cell chemokine production by hu Mab8D5.
- Figure 11 is a graph showing that hu Mab8D5 does not autonomously stimulate immune activity in healthy donor blood.
- Figures 12A-B are Western blots showing hu Mab8D5 and hu Mab4C7 (Fig.
- Figures 13A-B are graphs showing that hu Mab8D5 suppressed SEB response and B cell proliferation in a dose dependent manner.
- Figures 14A-D are graphs illustrating that the tested anti-BTLA agonist antibodies do not elicit a cytokine storm in human PBMC cultures, as measured by the lack of production of IL-2 (Figs. 14A, B), IFN ⁇ (Figs. 14C), and TNF ⁇ (Fig. 14D) in human PBMC cultures.
- Figure 15 is a graph of day 28 ELISA results showing that hu Mab8D5 inhibited human anti-TT recall IgG response in SCIDhu SPL mice.
- Figure 16 is a graph of day 28 ELISA results showing that hu Mab8D5 inhibited human total IgG response in SCIDhu SPL mice.
- Figures 17A-B are graphs showing titers from individual treated mice illustrating that hu Mab8D5 inhibited human anti-TT recall IgG response in SCIDhu SPL mice
- FIG. 17A compared to isotype control
- Figures 18A-B are graphs showing titers from individual treated mice illustrating that hu Mab8D5 inhibited human total IgG response in SCIDhu SPL mice (Fig. 18A) compared to isotype control (Fig. 18B).
- the mammalian immune system has developed several pathways to harness the potentially harmful activities of T and B lymphocytes. These include a wide variety of cytokine-receptor pathways as well as costimulation pathways involving receptors like CD28, CTLA-4, PD-I and BTLA. Whereas the CD28 - B7 interaction is an example of a positive costimulatory pathway (Le., CD28 triggering enhances T cell responses to antigen specific triggers), the other three receptors are representations of inhibitory costimulation pathways.
- CTLA-4, PD-I and BTLA show overlapping, but distinct expression profiles, and limit the activity of T and B lymphocytes as well as other immune cells in a non-redundant fashion. (See, Deppong et al.
- CTLA-4 competes with CD28 for binding of B7.1 and B7.2 (CD80 and CD86) and sets a primordial threshold for naive T cell activation in lymph nodes and spleen
- B7.1 and B7.2 CD80 and CD86
- PD-I and BTLA each have their own unique ligands (PD-L 1/-L2 and HVEM, respectively) and appear to control peripheral T cell homeostasis and re-activation.
- B-and T-Lymphocyte Attenuator is expressed on both resting and activated B- and T- lymphocytes.
- BTLA is a type I transmembrane glycoprotein and has a cytoplasmic tail which contains several inhibitory tyrosine motifs (Watanabe, 2003).
- BTLA bears some structural similarity to members of the CD28/CTLA-4 family, but several factors make it a unique member.
- Human BTLA contains the following characterized domains: Ig extracellular domain: residues 51-117; transmembrane domain: residuesl53-173; ITIM domain: residues 255-260; and an ITSM domain: residues 280-285 (with reference to human SEQ ID NO:2).
- ITIM stands for immunoreceptor tyrosine- based inhibition motif
- ITSM stands for immunoreceptor tyrosine-based switch motif.
- the BTLA Ig intermediate-type (I set-type) extracellular domain corresponding to residues 43-134 of SEQ ID NO:2 is responsible for ligand binding and is not found in other members of the CD28/CTLA-4 family.
- the ligand for BTLA is not a B7 family member, but rather it is the TNFR superfamily receptor herpesvirus entry mediator (HVEM) (Sedy, 2005). HVEM is expressed on peripheral B and T cells and monocytes, and the crystal structure of HVEM bound to BTLA has been solved (Compaan, 2005).
- HVEM herpesvirus entry mediator
- BTLA-deficient mice generated by Murphy and co-workers (Washington University St. Louis) exhibited a three-fold increase in IgG production in response to T-dependent antigen.
- T and B cells isolated from BTLA 7" mice showed a greater proliferative response to antigen-receptor stimulation using -CD3 and anti- IgM, respectively (Watanabe, 2003).
- BTLA was found associated with the B cell receptor complex and with the T cell receptor.
- antigen- receptor independent stimulation using Con A (T cells) or LPS (B cells) is not affected in BTLA deficient lymphocytes and cannot be modulated using anti-BTLA antibodies.
- BTLA knockout mice have been shown to develop spontaneous autoimmune disease over time and have a decreased lifespan (Oya, 2008). Ligation of BTLA by HVEM leads to downregulation of T cell activation and proliferation (Sedy, 2005). BTLA knockout mice exhibit increased disease severity in autoimmune encephalomyelitis (EAE) and allergic airway inflammation models, both of which are dependent on T cell activity (Watanabe, 2005; Deppong, 2006). An association between a SNP in the human BTLA gene and susceptibility to RA has also been shown (Lin, 2006). However, little is yet known about the role of BTLA signaling in pathological conditions.
- EAE autoimmune encephalomyelitis
- Agonist BTLA antibodies are particularly well-suited for this role.
- a number of agonist antibodies and antagonist BTLA antibodies were identified.
- several antibodies including hu Mab8D5, hu Mab8A3, hu Mab21H6, and hu Mabl9A7 were identified that activate inhibitory BTLA receptor function (Le., agonist antibodies).
- Hu Mab8D5 and hu Mab8A3 are BTLA agonists that do not block HVEM ligand binding to BTLA.
- Hu Mab21H6 and hu Mabl9A7 activate inhibitory BTLA receptor function while also blocking HVEM ligand binding to BTLA.
- These agonist antibodies exhibit -12-14 nM binding affinity for BTLA, and also inhibit T and B cell responses in human donor blood with an EC50 of -30-100 nM.
- hu Mab8D5 maintained its immune inhibitory activity in vitro.
- These agonist BTLA antibodies also bind to cynomolgus BTLA with similar affinity and demonstrate equivalent inhibition of cynomolgus T cell responses. However, these agonist antibodies do not cross- react with mouse BTLA.
- hu Mab8D5 In mouse pharmacological studies, hu Mab8D5 exhibited a half-life of -16 days, consistent with expectations for a human IgG4. These receptor agonistic mAbs inhibit and suppress T and B lymphocyte activity in vitro, and also exhibit such activity in in vivo model systems. Agonist antibodies of the present invention are distinguished by having the ability to inhibit B cell activation by cognate antigen without depleting the B cells.
- agonist antibodies of the present invention are also distinguished by the ability to target B and T cell activation simultaneously.
- the selection also identified an antagonist antibody hu Mab4C7.
- This antibody exhibits immune stimulating effects as shown in Figures 6C-D and Figures 8A-B and therefore is expected to be useful as a cancer treatment, or for treatment of certain pathogenic infections, and as an adjuvant to a vaccine.
- a BTLA antagonist such as Mab4C7 for stimulating the immune response in the context of cancer is expected to correlate with these results as well as results illustrating that blocking BTLA-HVEM ligation during priming of na ⁇ ' ve CD8+ T cells contributes to enhanced T cell proliferation.
- the ability to suppress both antigen-specific T and B cell responses will provide methods for modulating BTLA activity that are expected to be useful for conditions such as arthritis, SLE, Sjogren's disease, ulcerative colitis and Crohn's disease, as well as solid organ transplants (Le., kidney, liver and other organs, including tissue transplants). Current treatments exhibit deficiencies in part because suppressing T cells alone is not sufficient to achieve the desired effects.
- the anti-BTLA antibodies of the present invention may be efficacious for the treatment of arthritis, ulcerative colitis and Crohn's disease, as well as solid organ transplants (Le., kidney, liver and other organs) by the ability to suppress both T- and B-cell responses.
- the ability of each of the agonist antibodies of the present invention when re-expressed as an IgG4, as well as a monovalent Fab' fragment to maintain immune inhibitory activity in vitro and in vivo models, provides desirable traits for novel treatments.
- Hu Mab8D5 fully human monoclonal agonist anti-BTLA antibody
- Hu Mab8A3 fully human monoclonal agonist anti-BTLA antibody
- Hu Mab21H6 fully human monoclonal agonist anti-BTLA antibody
- Hu Mabl9A7 fully human monoclonal agonist anti-BTLA antibody
- FW Antibody framework region the immunoglobulin variable regions excluding the CDR regions
- V region The segment of IgG chains which is variable in sequence between different antibodies. It extends to Kabat residue 109 in the light chain and 113 in the heavy chain.
- Activation may have the same meaning, e.g., activation, stimulation, or treatment of a cell or receptor with a ligand, unless indicated otherwise by the context or explicitly.
- Ligand encompasses natural and synthetic ligands, e.g., cytokines, cytokine variants, analogues, muteins, and binding compounds derived from antibodies.
- Ligand also encompasses small molecules, e.g., peptide mimetics of cytokines and peptide mimetics of antibodies.
- Activation can refer to cell activation as regulated by internal mechanisms as well as by external or environmental factors.
- Response e.g., of a cell, tissue, organ, or organism, encompasses a change in biochemical or physiological behavior, e.g., concentration, density, adhesion, or migration within a biological compartment, rate of gene expression, or state of differentiation, where the change is correlated with activation, stimulation, or treatment, or with internal mechanisms such as genetic programming.
- Activity of a molecule may describe or refer to the binding of the molecule to a ligand or to a receptor, to catalytic activity; to the ability to stimulate gene expression or cell signaling, differentiation, or maturation; to antigenic activity, to the modulation of activities of other molecules, and the like. "Activity” of a molecule may also refer to activity in modulating or maintaining cell-to-cell interactions, e.g., adhesion, or activity in maintaining a structure of a cell, e.g., cell membranes or cytoskeleton.
- Activity can also mean specific activity, e.g., [catalytic activity]/[mg protein], or [immunological activity]/[mg protein], concentration in a biological compartment, or the like. “Activity” may refer to modulation of components of the innate or the adaptive immune systems. "Proliferative activity” encompasses an activity that promotes, that is necessary for, or that is specifically associated with, e.g., normal cell division, as well as cancer, tumors, dysplasia, cell transformation, metastasis, and angiogenesis.
- administering refers to contact of an exogenous pharmaceutical, therapeutic, diagnostic agent, or composition to the animal, human, subject, cell, tissue, organ, or biological fluid.
- administering can refer, e.g., to therapeutic, pharmacokinetic, diagnostic, research, and experimental methods. Treatment of a cell encompasses contact of a reagent to the cell, as well as contact of a reagent to a fluid, where the fluid is in contact with the cell.
- administering and “treatment” also means in vitro and ex vivo treatments, e.g., of a cell, by a reagent, diagnostic, binding compound, or by another cell.
- subject includes any organism, preferably an animal, more preferably a mammal (e.g., rat, mouse, dog, cat, rabbit) and most preferably a human.
- a BTLA agonist antibody refers to an antibody that binds to
- a BTLA antagonist antibody refers to an antibody that binds to
- composition of the invention is administered to a subject in accordance with the Physicians' Desk Reference 2003 (Thomson Healthcare; 57th edition (November 1, 2002)).
- the anti-BTLA antibody or antigen binding fragment thereof can be administered by an invasive route such as by injection (see above). Administration by a non-invasive route ⁇ e.g., orally; for example, in a pill, capsule or tablet) is also within the scope of the present invention.
- an anti- BTLA antibody or antigen binding fragment thereof, or pharmaceutical composition thereof is administered intravenously, subcutaneously, intramuscularly, intraarterially, intra-articular (e.g. in arthritis joints), by inhalation, aerosol delivery, or intratumorally.
- the anti-BTLA antibody or antigen binding fragment thereof is administered in combination with a chemotherapeutic agent (e.g., gefitinib (e.g., IressaTM)) administered orally in tablet form.
- a chemotherapeutic agent e.g., gefitinib (e.g., IressaTM)
- the chemotherapeutic agent is paclitaxel (e.g., Taxol®) which is administered intravenously.
- the anti-BTLA antibody or antigen binding fragment thereof is administered in combination with at least one additional therapeutic agent, such as, but not limited to other monoclonal antibodies directed to CTLA-4 (e.g., AVASTIN (bevacizumab), MYLOTARG (gemtuzumab), BEXXAR (tositumomab), RITUXAN (rituximab), HERCEPTIN (trastuzumab)), or protein ligands having similar effects; agents that activate antigen presenting cells (dendritic cells, macrophages, B cells, monocytes), including type 1 interferons (e.g., interferon alpha and beta); interferon gamma; BCG; agents that provide tumor antigens in any and all forms, including protein antigens, peptide antigens, whole cell lysates and derivatives thereof; genetically encoded antigens (e.g., adenovirus encoded antigens); cellular
- CTLA-4 e.
- antigens examples include PSA antigens (e.g., PROSTV AC/TRICOM) and melanoma-derived gplOO antigens.
- the combination may also be administered in combination with a cytokine or growth factor such as but not limited to GM-CSF, or with an immunostimulatory nucleotide, such as but not limited to CpG ODN PF3512676 (also known as ProMune, See WO2007/008463).
- the anti-BTLA antibody or antigen binding fragment thereof can be administered in combination with antibodies such as anti- CTLA-4 and anti-PDl, including those described in U.S. Patent No. 6,682,736 and U.S. Patent No. 7,563,869, respectively.
- compositions can be administered with medical devices known in the art.
- a pharmaceutical composition of the invention can be administered by injection with a hypodermic needle.
- compositions of the invention may also be administered with a needleless hypodermic injection device; such as the devices disclosed in U.S. Patent Nos. 6,620,135; 6,096,002; 5,399,163; 5,383,851; 5,312,335; 5,064,413; 4,941,880; 4,790,824 or 4,596,556.
- a needleless hypodermic injection device such as the devices disclosed in U.S. Patent Nos. 6,620,135; 6,096,002; 5,399,163; 5,383,851; 5,312,335; 5,064,413; 4,941,880; 4,790,824 or 4,596,556.
- Examples of well-known implants and modules form administering pharmaceutical compositions include: U.S. Patent No. 4,487,603, which discloses an implantable micro-infusion pump for dispensing medication at a controlled rate; U.S. Patent No. 4,447,233, which discloses a medication infusion pump for delivering medication at a precise infusion rate; U.S. Patent No. 4,447,224, which discloses a variable flow implantable infusion apparatus for continuous drug delivery; U.S. Patent. No. 4,439,196, which discloses an osmotic drug delivery system having multi-chamber compartments. Many other such implants, delivery systems, and modules are well known to those skilled in the art.
- Treating means to administer a therapeutic agent, such as a composition containing any of the binding compounds of the present invention, internally or externally to a patient having one or more disease symptoms for which the agent has known therapeutic activity.
- the agent is administered in an amount effective to alleviate one or more disease symptoms in the treated patient or population, whether by inducing the regression of or inhibiting the progression of such symptom(s) by any clinically measurable degree.
- the amount of a therapeutic agent that is effective to alleviate any particular disease symptom may vary according to factors such as the disease state, age, and weight of the patient, and the ability of the drug to elicit a desired response in the patient.
- Whether a disease symptom has been alleviated can be assessed by any clinical measurement typically used by physicians or other skilled healthcare providers to assess the severity or progression status of that symptom. While an embodiment of the present invention (e.g., a treatment method or article of manufacture) may not be effective in alleviating the target disease symptom(s) in every patient, it should alleviate the target disease symptom(s) in a statistically significant number of patients as determined by any statistical test known in the art such as the Student's t-test, the chi 2 -test, the U-test according to Mann and Whitney, the Kruskal-Wallis test (H-test), Jonckheere-Terpstra-test and the Wilcoxon-test.
- any statistical test known in the art such as the Student's t-test, the chi 2 -test, the U-test according to Mann and Whitney, the Kruskal-Wallis test (H-test), Jonckheere-Terpstra-test and the Wilcoxon-test.
- Treatment refers to therapeutic treatment, prophylactic or preventative measures, to research and diagnostic applications.
- Treatment as it applies to a human, veterinary, or research subject, or cell, tissue, or organ, encompasses contact of a BTLA agonist or antagonist to a human or animal subject, a cell, tissue, physiological compartment, or physiological fluid.
- Treatment of a cell also encompasses situations where the BTLA agonist or antagonist contacts BTLA receptor, e.g., in the fluid phase or colloidal phase, but also situations where the agonist or antagonist does not contact the cell or the receptor.
- an anti-BTLA antibody or antigen-binding fragment thereof alone, or in combination can be used for treating or preventing any disease or condition in a subject in need of such treatment or prevention.
- the condition is mediated, for example, by elevated expression or activity of BTLA, or by elevated expression of its ligand (e.g., HVEM) and may be treated or prevented by modulation of BTLA-HVEM ligand binding, activity or expression.
- the disease or condition is mediated by an increased level of BTLA, and/or HVEM and is treated or prevented by decreasing BTLA-HVEM ligand binding, activity, or expression.
- Antagonist anti-BTLA antibodies as described herein will block the activity of BTLA as a negative signaling molecule and will result in upregulating the response to tumors by T and B cells.
- B and T lymphocyte attenuator genes/ proteins are used interchangeably, which includes variants, isoforms, homologs orthologs and paralogs.
- antibodies specific for human BTLA may, in certain embodiments, cross-react with BTLA from species other than human. In other embodiments the antibodies specific for human BTLA may be completely specific for human BTLA and may not exhibit species or other types of cross reactivity.
- human BTLA refers to a human BTLA sequence. Human BTLA sequences, unless otherwise noted, encompass all human isotypes and BTLA variants, such as the complete amino acid sequence of human BTLA that has Genbank Accession No. AAP44003.
- Transcript variant 1 described at GenBank Accession No. NP_861445 is 289 amino acids in length and exhibits nearly 98% identity with the BTLA sequence of Accession No. AAP44003. This variant represents the longer transcript and encodes the longer isoform of 289 amino acids.
- Transcript variant 2 (GenBank Accession No. NM_OO1O85357) lacks an alternate in-frame exon, compared to variant 1, resulting in a shorter protein of 241 amino acids (isoform 2, GenBank Accession No. NP_001078826), compared to isoform 1.
- the human BTLA sequences may differ by having, for example, conserved mutations or mutations in non-conserved regions and the BTLA has substantially the same biological function as the human BTLA of SEQ ID NO:2, SEQ ID NO:35, or SEQ LD NO:37.
- a biological function of human BTLA is to suppress an immune response, such as a T-cell response. That is, BTLA is considered to be a negative regulator. It has C-terminal inhibitor motifs that are involved in reducing IL-2 production and T cell expansion (Watanabe et al, Nat. Immunol., 4, 670-679, 2003; Chemnitz et al, J. Immunol., 176, 6603-6614, 2006).
- a biological function of human BTLA may be having, for example, an epitope in the extracellular domain of BTLA that is specifically bound by an antibody of the instant disclosure.
- a particular BTLA sequence will generally be at least 90% identical in amino acid sequence to human BTLA of SEQ ID NO:2, SEQ ID NO:35, or SEQ ID NO:37, or other isoforms, and contain amino acid residues that identify the amino acid sequence as being human when compared to BTLA amino acid sequences of other species (e.g., murine).
- a human BTLA may be at least 95%, or even at least 96%, 97%, 98% or 99% identical to human BTLA of SEQ ID NO:2, SEQ ID NO:35, or SEQ ID NO:37, or other isoforms or variants.
- a human BTLA sequence will display no more than 10 amino acid differences from the BTLA of SEQ ID NO:2, SEQ ID NO:35, or SEQ ID NO:37, or other isoforms or variants.
- the human BTLA may display no more than 5, or even no more than 4, 3, 2, or 1 amino acid difference from the BTLA of SEQ ID NO:2, SEQ ID NO:35, or SEQ ID NO:37, or other isoforms or variants. Percent identity can be determined as described herein.
- immune response refers to the action of, for example, lymphocytes, antigen presenting cells, phagocytic cells, granulocytes, and soluble macromolecules produced by the above cells or the liver (including antibodies, cytokines, and complement) that results in selective damage to, destruction of, or elimination from the human body of invading pathogens, cells or tissues infected with pathogens, cancerous cells, or, in cases of autoimmunity or pathological inflammation, normal human cells or tissues.
- mouse analog antibodies In certain instances it is useful to conduct corollary studies on mouse analog antibodies. Suitable methods as described herein can be used to generate anti-BTLA mouse antibodies as well as to select and characterize mouse anti-BTLA antibodies. While any mouse BTLA peptide with desired features and activities can be used to generate mouse BTLA antibodies, the sequences described by Watanabe et al. Nat. Immunol. 4 (7), 670-679 (2003) including GenBank Accession No. AAP44002 (306 amino acids) coded for by GenBank Accession No. AY293285 are preferred.
- Mouse BTLA splice variants include the coding sequence NM_001037719 and corresponding amino acid sequence NP_001032808 for the longer transcript variant 1 (306 amino acids in length) and the shorter transcript 2 variant sequence is described at GenBank NP_808252 (305 amino acids in length); which uses an alternate in-frame splice site in the 3' coding region, compared to variant 1, resulting in a shorter protein (isoform 2).
- the term “antibody” refers to any form of antibody that exhibits the desired biological activity. Thus, it is used in the broadest sense and specifically covers, but is not limited to, monoclonal antibodies (including full length monoclonal antibodies), polyclonal antibodies, multispecific antibodies ⁇ e.g., bispecific antibodies), humanized, fully human antibodies, chimeric antibodies and camelized single domain antibodies.
- anti BTLA antibody or "antigen binding fragment” of an antibody (the “parental antibody”) encompass a fragment or a derivative of an antibody, typically including at least a fragment of the antigen binding or variable regions ⁇ e.g.
- antibody binding fragments include, but are not limited to, Fab, Fab', F(ab') 2 , and Fv fragments; diabodies; linear antibodies; single-chain antibody molecules, e.g., sc-Fv; nanobodies and multispecific antibodies formed from antibody fragments.
- a binding fragment or derivative retains at least 10% of its BTLA binding activity when that activity is expressed on a molar basis.
- a binding fragment or derivative retains at least 20%, 50%, 70%, 80%, 90%, 95% or 100% or more of the BTLA binding affinity as the parental antibody.
- an anti BTLA antigen binding fragment can include conservative or non conservative amino acid substitutions (referred to as “conservative variants” or “function conserved variants” of the antibody) that do not substantially alter its biologic activity.
- binding compound refers to both antibodies and binding fragments thereof.
- isolated antibody refers to the purification status of a binding compound and in such context means the molecule is substantially free of other biological molecules such as nucleic acids, proteins, lipids, carbohydrates, or other material such as cellular debris and growth media. Generally, the term “isolated” is not intended to refer to a complete absence of such material or to an absence of water, buffers, or salts, unless they are present in amounts that substantially interfere with experimental or therapeutic use of the binding compound as described herein.
- a "Fab fragment” is comprised of one light chain and the C H I and variable regions of one heavy chain.
- the heavy chain of a Fab molecule cannot form a disulfide bond with another heavy chain molecule.
- An "Fc" region contains two heavy chain fragments comprising the C H 1 and
- C H 2 domains of an antibody The two heavy chain fragments are held together by two or more disulfide bonds and by hydrophobic interactions of the C H 3 domains.
- a "Fab' fragment” contains one light chain and a portion or fragment of one heavy chain that contains the V H domain and the C H I domain and also the region between the C H I and C H 2 domains, such that an interchain disulfide bond can be formed between the two heavy chains of two Fab' fragments to form a F(ab') 2 molecule.
- a "F(ab') 2 fragment” contains two light chains and two heavy chains containing a portion of the constant region between the C H 1 and C H 2 domains, such that an interchain disulfide bond is formed between the two heavy chains.
- a F(ab') 2 fragment thus is composed of two Fab' fragments that are held together by a disulfide bond between the two heavy chains.
- the "Fv region” comprises the variable regions from both the heavy and light chains, but lacks the constant regions.
- single-chain Fv or "scFv” antibody refers to antibody fragments comprising the V H and V L domains of an antibody, wherein these domains are present in a single polypeptide chain.
- the Fv polypeptide further comprises a polypeptide linker between the V H and V L domains which enables the scFv to form the desired structure for antigen binding.
- scFv see Pluckthun (1994) THE PHARMACOLOGY OF MONOCLONAL ANTIBODIES, vol. 113, Rosenburg and Moore eds. Springer- Verlag, New York, pp. 269-315. See also, International Patent Application Publication No. WO 88/01649 and U.S. Pat. Nos. 4,946, 778 and 5,260,203.
- a "domain antibody” is an immunologically functional immunoglobulin fragment containing only the variable region of a heavy chain or the variable region of a light chain.
- two or more V H regions are covalently joined with a peptide linker to create a bivalent domain antibody.
- the two V H regions of a bivalent domain antibody may target the same or different antigens.
- a "bivalent antibody” comprises two antigen binding sites. In some instances, the two binding sites have the same antigen specificities. However, bivalent antibodies may be bispecific (see below).
- an "anti-BTLA” antibody refers to an antibody that is raised against human BTLA or a variant thereof, or any antigenic fragment thereof.
- the term "monoclonal antibody”, as used herein, refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e., the individual antibodies comprising the population are identical except for possible naturally occurring mutations that may be present in minor amounts. Monoclonal antibodies are highly specific, being directed against a single antigenic epitope. In contrast, conventional (polyclonal) antibody preparations typically include a multitude of antibodies directed against (or specific for) different epitopes. The modifier “monoclonal” indicates the character of the antibody as being obtained from a substantially homogeneous population of antibodies, and is not to be construed as requiring production of the antibody by any particular method.
- the monoclonal antibodies to be used in accordance with the present invention may be made by the hybridoma method first described by Kohler et al. (1975) Nature 256: 495, or may be made by recombinant DNA methods ⁇ see, e.g., U.S. Pat. No. 4,816,567).
- the "monoclonal antibodies” may also be isolated from phage antibody libraries using the techniques described in Clackson et al. (1991) Nature 352: 624-628 and Marks et al. (1991) J. MoL Biol. 222: 581-597, for example. See also Presta (2005) J. Allergy Clin. Immunol. 116:731.
- monoclonal antibodies include “chimeric” antibodies
- immunoglobulins in which a portion of the heavy and/or light chain is identical with or homologous to corresponding sequences in antibodies derived from a particular species or belonging to a particular antibody class or subclass, while the remainder of the chain(s) is identical with or homologous to corresponding sequences in antibodies derived from another species or belonging to another antibody class or subclass, as well as fragments of such antibodies, so long as they exhibit the desired biological activity (U.S. Pat. No. 4,816,567; and Morrison et al, (1984) Proc. Natl. Acad. Sci. USA Sl: 6851-6855).
- a “chimeric antibody” is an antibody having the variable domain from a first antibody and constant domain from a second antibody, where the first and second antibodies are from different species.
- the variable domains are obtained from an antibody from an experimental animal (the “parental antibody”), such as a rodent, and the constant domain sequences are obtained from human antibodies, so that the resulting chimeric antibody will be less likely to elicit an adverse immune response in a human subject than the parental rodent antibody.
- monoclonal antibodies herein also include camelized single domain antibodies. See, e.g., Muyldermans et al. (2001) Trends Biochem. Sci. 26:230; Reichmann et al. (1999) J. Immunol. Methods 231:25; WO 94/04678; WO 94/25591; U.S. Pat. No. 6,005,079).
- the present invention provides single domain antibodies comprising two V H domains with modifications such that single domain antibodies are formed.
- diabodies refers to small antibody fragments with two antigen-binding sites, which fragments comprise a heavy chain variable domain (V H ) connected to a light chain variable domain (V L ) in the same polypeptide chain (V H -V L or V L - V H ).
- V H heavy chain variable domain
- V L light chain variable domain
- the domains are forced to pair with the complementary domains of another chain and create two antigen-binding sites.
- Diabodies are described more fully in, e.g., EP 404,097; WO 93/11161; and Holliger et al. (1993) Proc. Natl. Acad. Sci. USA 90: 6444-6448.
- Holliger and Hudson (2005) Nat. Biotechnol. 23:1126-1136 For a review of engineered antibody variants generally see Holliger and Hudson (2005) Nat. Biotechnol. 23:1126-1136.
- humanized antibody refers to forms of antibodies that contain sequences from both human and non-human (e.g., murine, rat) antibodies.
- the humanized antibody will comprise substantially all of at least one, and typically two, variable domains, in which all or substantially all of the hypervariable loops correspond to those of a non-human immunoglobulin, and all or substantially all of the framework (FR) regions are those of a human immunoglobulin sequence.
- the humanized antibody may optionally comprise at least a portion of a human immunoglobulin constant region (Fc).
- the antibodies of the present invention also include antibodies with modified
- Fc regions to provide altered effector functions. See, e.g., U.S. Pat. No. 5,624,821; WO2003/086310; WO2005/120571; WO2006/0057702. Such modification can be used to enhance or suppress various reactions of the immune system, with possible beneficial effects in diagnosis and therapy. Alterations of the Fc region include amino acid changes (substitutions, deletions and insertions), glycosylation or deglycosylation, and adding multiple Fc. Changes to the Fc can also alter the half-life of antibodies in therapeutic antibodies, enabling less frequent dosing and thus increased convenience and decreased use of material. See Presta (2005) /. Allergy Clin. Immunol. 116:731 at 734-35.
- Fully human antibody refers to an antibody that comprises human immunoglobulin protein sequences only.
- a fully human antibody may contain murine carbohydrate chains if produced in a mouse, in a mouse cell, or in a hybridoma derived from a mouse cell.
- mouse antibody refers to an antibody that comprises mouse immunoglobulin sequences only.
- a fully human antibody may contain rat carbohydrate chains if produced in a rat, in a rat cell, or in a hybridoma derived from a rat cell.
- rat antibody refers to an antibody that comprises rat immunoglobulin sequences only.
- the basic antibody structural unit is known to comprise a tetramer.
- Each tetramer includes 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 or fragment of each chain may include a variable region of about 100 to 110 or more amino acids primarily responsible for antigen recognition.
- the carboxy-terminal portion or fragment of each chain may define a constant region primarily responsible for effector function.
- human light chains are classified as kappa and lambda light chains.
- human heavy chains are typically classified as mu, delta, gamma, alpha, or epsilon, and define the antibody's isotype as IgM, IgD, IgG, IgA, and IgE, respectively.
- variable and constant regions are joined by a "J" region of about 12 or more amino acids, with the heavy chain also including a "D” region of about 10 more amino acids.
- J The variable regions of each light/heavy chain pair to form the antibody binding site.
- an intact IgG antibody has two binding sites. Except in bifunctional or bispecific antibodies, the two binding sites are, in general, the same.
- the chains all exhibit the same general structure of relatively conserved framework regions (FR) joined by three hypervariable regions, also called complementarity determining regions or CDRs.
- the CDRs from the two chains of each pair are usually aligned by the framework regions, enabling binding to a specific epitope.
- both light and heavy chains comprise the domains FRl, CDRl, FR2 , CDR2, FR3, CDR3 and FR4.
- the assignment of amino acids to each domain is, generally, in accordance with the definitions of Sequences of Proteins of Immunological Interest, Kabat, et al.; National Institutes of Health, Bethesda, Md.
- hypervariable region refers to the amino acid residues of an antibody which are responsible for antigen-binding.
- the hypervariable region comprises amino acid residues from a "complementarity determining region” or "CDR” (i.e. residues 24-34 (CDRLl), 50-56 (CDRL2) and 89-97 (CDRL3) in the light chain variable domain and residues 31-35 (CDRHl), 50-65 (CDRH2) and 95-102 (CDRH3) in the heavy chain variable domain; Kabat et al. (1991) Sequences of Proteins of Immunological Interest, 5th Ed.
- CDR complementarity determining region
- Binding substance refers to a molecule, small molecule, macromolecule, antibody, a fragment or analogue thereof, or soluble receptor, capable of binding to a target.
- Binding substance also may refer to a complex of molecules, e.g., a non-covalent complex, to an ionized molecule, and to a covalently or non-covalently modified molecule, e.g., modified by phosphorylation, acylation, cross-linking, cyclization, or limited cleavage, that is capable of binding to a target.
- Binding substance may also refer to a molecule capable of binding to a target in combination with a stabilizer, excipient, salt, buffer, solvent, or additive. "Binding” may be defined as an association of the binding substance with a target where the association results in reduction in the normal Brownian motion of the binding substance, in cases where the binding substance can be dissolved or suspended in solution.
- Effective amount encompasses an amount sufficient to ameliorate or prevent a symptom or sign of the medical condition. Effective amount also means an amount sufficient to allow or facilitate diagnosis.
- An effective amount for a particular patient or veterinary subject may vary depending on factors such as the condition being treated, the overall health of the patient, the method route and dose of administration and the severity of side affects (see, e.g., U.S. Pat. No. 5,888,530 issued to Netti, et al.).
- An effective amount can be the maximal dose or dosing protocol that avoids significant side effects or toxic effects.
- the effect will result in an improvement of a diagnostic measure or parameter by at least 5%, usually by at least 10%, more usually at least 20%, most usually at least 30%, preferably at least 40%, more preferably at least 50%, most preferably at least 60%, ideally at least 70%, more ideally at least 80%, and most ideally at least 90%, where 100% is defined as the diagnostic parameter shown by a normal subject (see, e.g., Maynard, et al. (1996) A Handbook of SOPs for Good Clinical Practice, Interpharm Press, Boca Raton, FL; Dent (2001) Good Laboratory and Good Clinical Practice, Urch Publ., London, UK).
- Exogenous refers to substances that are produced outside an organism, cell, or human body, depending on the context.
- Endogenous refers to substances that are produced within a cell, organism, or human body, depending on the context.
- Homology refers to sequence similarity between two polynucleotide sequences or between two polypeptide sequences.
- a position in both of the two compared sequences is occupied by the same base or amino acid monomer subunit, e.g., if a position in each of two DNA molecules is occupied by adenine, then the molecules are homologous at that position.
- the percent of homology between two sequences is a function of the number of matching or homologous positions shared by the two sequences divided by the number of positions compared xlOO. For example, if 6 of 10 of the positions in two sequences are matched or homologous when the sequences are optimally aligned then the two sequences are 60% homologous. Generally, the comparison is made when two sequences are aligned to give maximum percent homology.
- Immunoser condition encompasses, e.g., pathological inflammation, an inflammatory disorder, and an autoimmune disorder or disease.
- Immunune condition also refers to infections, persistent infections, and proliferative conditions, such as cancer, tumors, and angiogenesis, including infections, tumors, and cancers that resist eradication by the immune system.
- Treatment includes, e.g., cancer, cancer cells, tumors, angiogenesis, and precancerous conditions such as dysplasia.
- Intracellular disorder means a disorder or pathological condition where the pathology results, in whole or in part, from, e.g., a change in number, change in rate of migration, or change in activation, of cells of the immune system.
- Cells of the immune system include, e.g., T cells, B cells, monocytes or macrophages, antigen presenting cells (APCs), dendritic cells, microglia, NK cells, NKT cells, neutrophils, eosinophils, mast cells, or any other cell specifically associated with the immunology, for example, cytokine-producing endothelial or epithelial cells.
- isolated binding compound refers to the purification status of a binding compound and in such context means the molecule is substantially free of other biological molecules such as nucleic acids, proteins, lipids, carbohydrates, or other material such as cellular debris and growth media. Generally, the term “isolated” is not intended to refer to a complete absence of such material or to an absence of water, buffers, or salts, unless they are present in amounts that substantially interfere with experimental or therapeutic use of the binding compound as described herein.
- isolated nucleic acid molecule means a DNA or RNA of genomic, mRNA, cDNA, or synthetic origin or some combination thereof which is not associated with all or a portion of a polynucleotide in which the isolated polynucleotide is found in nature, or is linked to a polynucleotide to which it is not linked in nature.
- a nucleic acid molecule comprising a particular nucleotide sequence does not encompass intact chromosomes.
- Isolated nucleic acid molecules "comprising" specified nucleic acid sequences may include, in addition to the specified sequences, coding sequences for up to ten or even up to twenty or more other proteins or portions or fragments thereof, or may include operably linked regulatory sequences that control expression of the coding region of the recited nucleic acid sequences, and/or may include vector sequences.
- control sequences refers to DNA sequences necessary for the expression of an operably linked coding sequence in a particular host organism.
- the control sequences that are suitable for prokaryotes include a promoter, optionally an operator sequence, and a ribosome binding site.
- Eukaryotic cells are known to use promoters, polyadenylation signals, and enhancers.
- a nucleic acid is "operably linked" when it is placed into a functional relationship with another nucleic acid sequence.
- DNA for a presequence or secretory leader is operably linked to DNA for a polypeptide if it is expressed as a preprotein that participates in the secretion of the polypeptide;
- a promoter or enhancer is operably linked to a coding sequence if it affects the transcription of the sequence; or
- a ribosome binding site is operably linked to a coding sequence if it is positioned so as to facilitate translation.
- "operably linked” means that the DNA sequences being linked are contiguous, and, in the case of a secretory leader, contiguous and in reading phase. However, enhancers do not have to be contiguous. Linking is accomplished by ligation at convenient restriction sites. If such sites do not exist, the synthetic oligonucleotide adaptors or linkers are used in accordance with conventional practice.
- the expressions "cell,” “cell line,” and “cell culture” are used interchangeably and all such designations include progeny.
- the words “transformants” and “transformed cells” include the primary subject cell and cultures derived therefrom without regard for the number of transfers. It is also understood that all progeny may not be precisely identical in DNA content, due to deliberate or inadvertent mutations. Mutant progeny that have the same function or biological activity as screened for in the originally transformed cell are included. Where distinct designations are intended, it will be clear from the context.
- PCR polymerase chain reaction
- sequence information from the ends of the region of interest or beyond needs to be available, such that oligonucleotide primers can be designed; these primers will be identical or similar in sequence to opposite strands of the template to be amplified.
- the 5' terminal nucleotides of the two primers can coincide with the ends of the amplified material.
- PCR can be used to amplify specific RNA sequences, specific DNA sequences from total genomic DNA, and cDNA transcribed from total cellular RNA, bacteriophage or plasmid sequences, etc. See generally Mullis et al. (1987) Cold Spring Harbor Symp. Quant. Biol.
- PCR is considered to be one, but not the only, example of a nucleic acid polymerase reaction method for amplifying a nucleic acid test sample comprising the use of a known nucleic acid as a primer and a nucleic acid polymerase to amplify or generate a specific piece of nucleic acid.
- germline sequence refers to a sequence of unrearranged immunoglobulin DNA sequences. Any suitable source of unrearranged immunoglobulin may be used.
- Inhibitors and “antagonists,” or “activators” and “agonists,” refer to inhibitory or activating molecules, respectively, e.g., for the activation of, e.g., a ligand, receptor, cofactor, a gene, cell, tissue, or organ.
- a modulator of, e.g., a gene, a receptor, a ligand, or a cell is a molecule that alters an activity of the gene, receptor, ligand, or cell, where activity can be activated, inhibited, or altered in its regulatory properties.
- the modulator may act alone, or it may use a cofactor, e.g., a protein, metal ion, or small molecule.
- Inhibitors are compounds that decrease, block, prevent, delay activation, inactivate, desensitize, or down regulate, e.g., a gene, protein, ligand, receptor, or cell.
- Activators are compounds that increase, activate, facilitate, enhance activation, sensitize, or up regulate, e.g., a gene, protein, ligand, receptor, or cell.
- An inhibitor may also be defined as a compound that reduces, blocks, or inactivates a constitutive activity.
- An "agonist” is a compound that interacts with a target to cause or promote an increase in the activation of the target.
- An “antagonist” is a compound that opposes the actions of an agonist.
- An antagonist prevents, reduces, inhibits, or neutralizes the activity of an agonist.
- An antagonist can also prevent, inhibit, or reduce constitutive activity of a target, e.g., a target receptor, even where there is no identified agonist.
- a target e.g., a target receptor
- a BTLA agonist would initiate and potentiate the negative signal delivered by BTLA to B and T cells.
- a BTLA antagonist would block that signal to B and T cells, thus augmenting B and T cell activation/proliferation.
- samples or assays comprising a given, e.g., protein, gene, cell, or organism, are treated with a potential activator or inhibitor and are compared to control samples without the inhibitor.
- Control samples i.e., samples not treated with antagonist, are assigned a relative activity value of 100%.
- Inhibition is achieved when the activity value relative to the control is about 90% or less, typically 85% or less, more typically 80% or less, most typically 75% or less, generally 70% or less, more generally 65% or less, most generally 60% or less, typically 55% or less, usually 50% or less, more usually 45% or less, most usually 40% or less, preferably 35% or less, more preferably 30% or less, still more preferably 25% or less, and most preferably less than 25%.
- Activation is achieved when the activity value relative to the control is about 110%, generally at least 120%, more generally at least 140%, more generally at least 160%, often at least 180%, more often at least 2-fold, most often at least 2.5-fold, usually at least 5-fold, more usually at least 10-fold, preferably at least 20-fold, more preferably at least 40-fold, and most preferably over 40-fold higher.
- Endpoints in activation or inhibition can be monitored as follows. Activation, inhibition, and response to treatment, e.g., of a cell, physiological fluid, tissue, organ, and animal or human subject, can be monitored by an endpoint.
- the endpoint may comprise a predetermined quantity or percentage of, e.g., indicia of inflammation, oncogenicity, or cell degranulation or secretion, such as the release of a cytokine, toxic oxygen, or a protease.
- the endpoint may comprise, e.g., a predetermined quantity of ion flux or transport; cell migration; cell adhesion; cell proliferation; potential for metastasis; cell differentiation; and change in phenotype, e.g., change in expression of gene relating to inflammation, apoptosis, transformation, cell cycle, or metastasis (see, e.g., Knight (2000) Ann. CHn. Lab. ScL 30: 145- 158; Hood and Cheresh (2002) Nature Rev. Cancer 2:91-100; Timme, et al. (2003) Curr. Drug Targets 4:251-261 ; Robbins and Itzkowitz (2002) Med. Clin. North Am.
- An endpoint of inhibition is generally 75% of the control or less, preferably
- an endpoint of activation is at least 150% the control, preferably at least two times the control, more preferably at least four times the control, and most preferably at least ten times the control.
- Ligand refers, e.g., to a small molecule, peptide, polypeptide, and membrane associated or membrane-bound molecule, or complex thereof, that can act as an agonist or antagonist of a receptor. "Ligand” also encompasses an agent that is not an agonist or antagonist, but that can bind to the receptor. Moreover, "ligand” includes a membrane-bound ligand that has been changed, e.g., by chemical or recombinant methods, to a soluble version of the membrane-bound ligand. By convention, where a ligand is membrane-bound on a first cell, the receptor usually occurs on a second cell. The second cell may have the same or a different identity as the first cell.
- a ligand or receptor may be entirely intracellular, that is, it may reside in the cytosol, nucleus, or some other intracellular compartment.
- the ligand or receptor may change its location, e.g., from an intracellular compartment to the outer face of the plasma membrane.
- the complex of a ligand and receptor is termed a "ligand receptor complex.”
- HVEM is a TNF-receptor superfamily member. In addition to binding BTLA, it also can bind LIGHT, LTa and CD 160.
- Small molecule is defined as a molecule with a molecular weight that is less than 10 kDa, typically less than 2 kDa, preferably less than 1 kDa, and most preferably less than about 500 Da.
- Small molecules include, but are not limited to, inorganic molecules, organic molecules, organic molecules containing an inorganic component, molecules comprising a radioactive atom, synthetic molecules, peptide mimetics, and antibody mimetics. As a therapeutic, a small molecule may be more permeable to cells, less susceptible to degradation, and less apt to elicit an immune response than large molecules.
- a specified ligand binds to a particular receptor and does not bind in a significant amount to other proteins present in the sample.
- the antibody, or binding compound derived from the antigen-binding site of an antibody, of the contemplated method binds to its antigen, or a variant or mutein thereof, with an affinity that is at least two fold greater, preferably at least ten times greater, more preferably at least 20-times greater, and most preferably at least 100-times greater than the affinity with any other antigen.
- immunomodulatory agent refers to natural or synthetic agents that suppress or modulate an immune response.
- the immune response can be a humoral or cellular response.
- Immunomodulatory agents encompass immunosuppressive or anti-inflammatory agents.
- immunosuppressants are therapeutics that are used in immunosuppressive therapy to inhibit or prevent activity of the immune system. Clinically they are used to prevent the rejection of transplanted organs and tissues ⁇ e.g. bone marrow, heart, kidney, liver), and/or in the treatment of autoimmune diseases or diseases that are most likely of autoimmune origin (e.g. rheumatoid arthritis, myasthenia gravis, systemic lupus erythematosus, ulcerative colitis, multiple sclerosis).
- autoimmune diseases or diseases that are most likely of autoimmune origin (e.g. rheumatoid arthritis, myasthenia gravis, systemic lupus erythematosus, ulcerative colitis, multiple sclerosis).
- Immunosuppressive drugs can be classified as: glucocorticoids; cytostatics; antibodies; biological response modifiers such as Ig fusion proteins including CTLA-4/Ig (AbataceptTM); drugs acting on immunophilins; other drugs, including known chemotherapeutic agents used in the treatment of proliferative disorders, such as mycophenolatemofetil (MMF).
- the antibodies of the present invention can be administered in conjunction with a new class of myelin binding protein-like therapeutics, known as copaxones.
- "Anti-inflammatory agents” or “anti-inflammatory drugs” refer to both steroidal and non-steroidal therapeutics.
- Steroids also known as corticosteroids, are drugs that closely resemble Cortisol, a hormone produced naturally by adrenal glands. Steroids are used as the main treatment for certain inflammatory conditions, such as: systemic vasculitis (inflammation of blood vessels); and myositis (inflammation of muscle). Steroids might also be used selectively to treat inflammatory conditions such as: rheumatoid arthritis (chronic inflammatory arthritis occurring in joints on both sides of the body); systemic lupus erythematosus (a generalized disease caused by abnormal immune system function); Sjogren's syndrome (chronic disorder that causes dry eyes and a dry mouth).
- rheumatoid arthritis chronic inflammatory arthritis occurring in joints on both sides of the body
- systemic lupus erythematosus a generalized disease caused by abnormal immune system function
- Sjogren's syndrome chronic disorder that causes dry eyes and a dry mouth.
- Non-steroidal anti-inflammatory drugs are drugs with analgesic, antipyretic and anti-inflammatory effects - they reduce pain, fever and inflammation.
- the term "non-steroidal” is used to distinguish these drugs from steroids, which (amongst a broad range of other effects) have a similar eicosanoid-depressing, antiinflammatory action.
- NSAIDs are generally indicated for the symptomatic relief of the following conditions: rheumatoid arthritis; osteoarthritis; inflammatory arthropathies (e.g.
- NSAIDs include salicylates, arlyalknoic acids, 2-arylpropionic acids (profens), N-arylanthranilic acids (fenamic acids), oxicams, coxibs, and sulphonanilides.
- DMARDs Disease-modifying anti-rheumatic drugs
- NSAIDs include hydroxychloroquine/chloroquine, methotrexate, gold therapy, sulfasalazine, and azathioprine.
- a “signal transduction pathway” refers to the biochemical relationship between a variety of signal transduction molecules that play a role in the transmission of a signal from one portion of a cell to another portion of a cell.
- the phrase "cell surface receptor” includes, for example, molecules and complexes of molecules capable of receiving a signal and the transmission of such a signal across the plasma membrane of a cell.
- An example of a “cell surface receptor” of the present disclosure is the BTLA receptor.
- the present invention generally isolated antibodies or antigen binding fragments thereof that bind BTLA and uses of such antibodies or antigen binding fragments thereof. More specifically, the invention provides isolated fully human anti BTLA antibodies and methods of use of the antibodies or antigen binding fragments thereof in the treatment of disease. Examples of fully human anti-BTLA antibodies include, but are not limited to: Hu Mab8D5, hu Mab8A3, hu Mab21H6, hu Mabl9A7, and hu Mab4C7.
- the present invention provides an isolated anti-BTLA agonist antibody or antigen binding fragment thereof wherein the antibody or antigen binding fragment exhibits one or more of the following properties: (1) does not block binding of HVEM or LIGHT to human BTLA; (2) cross reacts with cynomolgus BTLA; (3) has a K D for binding to human BTLA of at most about 2.5 x 10 "9 in a protein binding assay (e.g., Biacore); and (4) an EC 50 of at least about 10 nM in a T and B cell activation assay.
- a protein binding assay e.g., Biacore
- anti-BTLA antibody or antigen binding fragment thereof has a K D for binding to human BTLA of at most about 2.5 x 10 "9 in a protein binding assay (e.g., Biacore; Examples 2-3) and an EC 5O of about 10-100 nM in a T and B cell activation assay.
- a protein binding assay e.g., Biacore; Examples 2-3
- an EC 5O of about 10-100 nM in a T and B cell activation assay.
- the antibody or antigen binding fragment is an isolated fully human antibody or antigen binding fragment thereof which blocks binding of HVEM to BTLA.
- examples of such antibodies include, but are not limited to, the fully human anti-BTLA antibody, hu Mab4C7.
- the isolated antibody or antigen binding fragment thereof, that binds BTLA can comprise one, two, three, four, five, or six complementarity determining regions (CDRs) of the described antibodies and antigen-binding fragments of the invention.
- CDRs complementarity determining regions
- the one, two, three, four, five, or six CDRs may be independently selected from the described CDR sequences (e.g., Table 1, Table 2) of the antibodies and antigen-binding fragments of the invention.
- the one, two, three, four, five, or six CDRs may be selected from the CDR sequences of a single described antibody or antigen-binding fragment of the invention.
- one two or three CDRs are selected from the V L CDRs (e.g., Table 1; SEQ ID NOs: 12-14) of the described agonist antibodies and/or one, two or three CDRs selected from the V H CDRs (e.g., Table 2; SEQ ID NOs:5-7) of the described invention.
- one two or three CDRs are selected from the V L CDRS (e.g., Table 1; SEQ ID NOs:26-28) of the described antagonist antibodies and/or one, two or three CDRs selected from the V H CDRs (e.g., Table 2; SEQ ID NOs: 19-21) of the described invention.
- the isolated antibody or antigen-binding fragment thereof that binds BTLA can comprise at least one antibody light chain variable (V L ) domain comprising one or more of CDR-Ll, CDR-L2 or CDR-L3 selected from the group consisting of: (a) CDR-Ll, CDR-L2 and CDR-L3 of the variable region of antibody hu Mab8D5; (b) CDR-Ll, CDR-L2 and CDR- L3 of the variable region of antibody hu Mab8A3; (c) CDR-Ll, CDR-L2 and CDR-L3 of the variable region of antibody hu Mab21H6; and (d) CDR-Ll, CDR-L2 and CDR-L3 of the variable region of antibody hu Mabl9A7.
- V L antibody light chain variable
- the isolated antibody or antigen-binding fragment thereof that binds BTLA can comprise at least one antibody heavy chain variable (VH) domain comprising one or more of CDR-Hl, CDR-H2 or CDR-H3 selected from the group consisting of: (a) CDR-Hl, CDR-H2 and CDR-H3 of the variable region of antibody hu Mab8D5; (b) CDR-Hl, CDR-H2 and CDR- H3 of the variable region of antibody hu Mab8A3; (c) CDR-Hl, CDR-H2 and CDR-H3 of the variable region of antibody hu Mab21H6; and (d) CDR-Hl, CDR-H2 and CDR-H3 of the variable region of antibody hu Mabl9A7.
- VH antibody heavy chain variable
- the isolated antibody or antigen-binding fragment thereof that binds BTLA comprises at least one antibody light chain variable (VL) domain comprising a CDR-Ll, CDR-L2 and CDR-L3 selected from the group consisting of: (a) CDR- Ll, CDR-L2 and CDR-L3 of the variable region of antibody hu Mab8D5; (b) CDR-Ll, CDR- L2 and CDR-L3 of the variable region of antibody hu Mab8A3; (c) CDR-Ll, CDR-L2 and CDR-L3 of the variable region of antibody hu Mab21H6; and (d) CDR-Ll, CDR-L2 and CDR- L3 of the variable region of antibody hu Mabl9A7 and at least one antibody heavy chain variable (V H ) domain comprising a CDR-Hl, CDR-H2 and CDR-H3 selected from the group consisting of: (a)
- VL domain CDRs for agonist antibodies are selected from SEQ ID NOs: 12-14, while VL domain CDRs for antagonist antibodies are selected from SEQ ID NOs:26-28.
- V H domain CDRs for agonist antibodies are selected from SEQ ID NOs: 7-9, while V H domain CDRs for antagonist antibodies are selected from SEQ ID NOs: 10-12.
- the present invention further provides an isolated antibody or antigen binding fragment thereof that binds BTLA and functions as an agonist antibody and comprises the mature V L domain of antibody Hu Mab8D5 (SEQ ID No: 18).
- the antibody is a fully human monoclonal antibody.
- preferred fully human agonist anti-BTLA antibodies include, but are not limited to hu Mab8D5, hu Mab8A3, hu Mab21H6, hu Mabl9A7, and antigen binding fragments thereof.
- the present invention further provides an isolated antibody or antigen binding fragment thereof that binds BTLA and functions as an antagonist and comprises the mature V L domain of antibody Hu Mab4C7 (SEQ ID No:32).
- the antibody is a fully human monoclonal antibody.
- An example of a preferred fully human antagonist anti- BTLA antibody includes, but is not limited to hu Mab4C7 and antigen binding fragments thereof.
- the present invention further provides an isolated antibody or antigen binding fragment thereof that binds BTLA and functions as an agonist and comprises at least one V H domain selected from the group consisting of (a) the mature V H domain of antibody Hu Mab8D5 (SEQ ID No: 11).
- the antibody is a fully human monoclonal agonist anti-BTLA antibody.
- preferred fully human agonist anti- BTLA antibodies include, but are not limited to hu Mab8D5, hu Mab8A3, hu Mab21H6, hu Mabl9A7, and antigen binding fragments thereof.
- the present invention further provides an isolated antibody or antigen binding fragment thereof that binds BTLA and functions as an antagonist and comprises at least one V H domain selected from the group consisting of (a) the mature V H domain of antibody hu Mab4C7 (SEQ ID No:25).
- the antibody is a fully human antagonist anti-BTLA antibody.
- An example of a preferred fully human antagonist anti-BTLA antibody includes, but is not limited to hu Mab4C7 and antigen binding fragments thereof.
- the present invention provides an isolated agonist antibody or antigen binding fragment thereof that binds BTLA and has at least one V L domain selected from the group consisting of SEQ ID Nos.:12, 13, and 14 and at least one V H domain selected from the group consisting of SEQ ID Nos.: 5, 6, and 7.
- the antibody is a fully human agonist anti-BTLA antibody.
- preferred fully human agonist anti-BTLA antibodies include, but are not limited to hu Mab8D5, hu Mab8A3, hu Mab21H6, hu Mabl9A7, and antigen binding fragments thereof.
- the present invention provides an isolated antagonist antibody or antigen binding fragment thereof that binds BTLA and has at least one V L domain selected from the group consisting of SEQ ID Nos.:26, 27, 28, and at least one VH domain selected from the group consisting of SEQ ID Nos.: 19, 20, and 21.
- the antibody is a fully human antagonist anti-BTLA antibody.
- Examples of preferred fully human antagonist anti-BTLA antibodies include, but are not limited to, hu Mab4C7 and antigen binding fragments thereof.
- the isolated antibody of the present invention comprises a heavy chain constant region, preferably a human constant region, such as ⁇ l, ⁇ 2, ⁇ 3, or ⁇ 4 human heavy chain constant region or a variant thereof.
- the binding compound comprises a light chain constant region, preferably a human light chain constant region, such as lambda or kappa human light chain region or variant thereof.
- the human heavy chain constant region can be ⁇ l and the human light chain constant region can be kappa.
- the Fc region of the antibody is ⁇ 4 with a Ser228Pro mutation (Schuurman, J et. al., MoI. Immunol. 38: 1-8, 2001).
- the antigen binding fragment is selected from the group consisting of Fab, Fab', Fab' -SH, Fv, scFv, F(ab') 2 , and a diabody.
- the invention also provides isolated polypeptides comprising the V L domains
- the invention provides an antibody or antigen binding fragment thereof that binds BTLA and has V L domains V H domains with at least 95%, 90%, 85%, 80%, 75% or 50% sequence homology.
- the binding compound of the present invention comprises V L and V H domains (with and without signal sequence) having up to 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more conservative or non conservative amino acid substitutions, while still exhibiting the desired binding property.
- Constantly modified variants or “conservative substitution” refers to substitutions of amino acids in a protein with other amino acids having similar characteristics (e.g. charge, side-chain size, hydrophobicity/hydrophilicity, backbone conformation and rigidity, etc.), such that the changes can frequently be made without altering the biological activity of the protein.
- Those of skill in this art recognize that, in general, single amino acid substitutions in non-essential regions of a polypeptide do not substantially alter biological activity (see, e.g., Watson et al. (1987) Molecular Biology of the Gene, The Benjamin/Cummings Pub. Co., p. 224 (4th Ed.)).
- binding compounds of the present invention comprise polypeptide chains with sequences that include up to 0 (no changes), 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 20 or more conservative amino acid substitutions when compared with the specific amino acid sequences disclosed herein, e.g. SEQ ID NOs: 5, 6, 7, 9, 11, 12, 13, 14, 16, 18, 19, 20, 21, 23, 25, 30, 32, and 37.
- the phrase "up to X" conservative amino acid substitutions includes 0 substitutions and any number of substitutions up to and including X substitutions.
- Such exemplary substitutions are preferably made in accordance with those set forth in Table 3 as follows:
- Function-conservative variants of the antibodies of the invention are also contemplated by the present invention.
- “Function-conservative variants” are those in which one or more amino acid residues in a protein or enzyme have been changed without altering the overall conformation and function of the polypeptide, including, but, by no means, limited to, replacement of an amino acid with one having similar properties.
- the invention also provides isolated polypeptides comprising the V L domains of agonist BTLA antibodies (e.g., SEQ ID Nos.:16 and 18) and isolated polypeptides comprising the V H domains (e.g., SEQ ID Nos.: 9 and 11) of agonist BTLA antibodies of the invention having up to 0, 1, 2, 3, 4, or 5 or more amino acid substitutions, while still exhibiting the ability to bind to BTLA.
- V L domains of agonist BTLA antibodies e.g., SEQ ID Nos.:16 and 18
- isolated polypeptides comprising the V H domains e.g., SEQ ID Nos.: 9 and 11
- the invention provides isolated polypeptides comprising the V L domains of antagonist BTLA antibodies (e.g., SEQ ID Nos.: 30 or 32) and isolated polypeptides comprising the V H domains (e.g., SEQ ID Nos.: 23 or 25) of antagonist BTLA antibodies of the invention having up to 0, 1, 2, 3, 4, or 5 or more amino acid substitutions, while still exhibiting the ability to bind to BTLA.
- antagonist BTLA antibodies e.g., SEQ ID Nos.: 30 or 32
- isolated polypeptides comprising the V H domains e.g., SEQ ID Nos.: 23 or 25
- the invention provides an antibody or antigen binding fragment thereof that binds human BTLA and has V L domains V H domains with at least 95%, 90%, 85%, 80%, 75% or 50% sequence homology to one or more of the V L domains or V H domains described herein, and exhibits binding to human BTLA.
- the binding compound of the present invention comprises V L and V H domains (with and without signal sequence) having up to 0, 1, 2, 3, 4, or 5 or more amino acid substitutions, and exhibits binding to human BTLA.
- an asparagine (Asn) residue may be changed to GIn or Ala to reduce the potential for formation of isoaspartate at any Asn- GIy sequences within a CDR.
- a similar problem may occur at a Asp-Gly sequence. See, Reissner and Aswad (2003) Cell. MoI. Life ScL 60:1281. Isoaspartate formation may debilitate or completely abrogate binding of an antibody to its target antigen. See, Presta (2005) /. Allergy Clin. Immunol.
- the asparagine is changed to glutamine (GIn). It may also be desirable to alter an amino acid adjacent to an asparagine (Asn) or glutamine (GIn) residue to reduce the likelihood of deamidation, which occurs at greater rates when small amino acids occur adjacent to asparagine or glutamine. See, Bischoff & Kolbe (1994) /. Chromatog. 662:261.
- any methionine residues (typically solvent exposed Met) in CDRs may be changed to Lys, Leu, Ala, or Phe in order to reduce the possibility that the methionine sulfur would oxidize, which could reduce antigen binding affinity and also contribute to molecular heterogeneity in the final antibody preparation.
- the methionine is changed to alanine (Ala).
- Al alanine
- Exemplary CDR variants for 8D5 VH include:
- CDRl variant SYDXH wherein X is M, K, L, A, or F (SEQ ID NO:38)
- VH CDRs The X variations for the VH CDRs can be independently selected in any combination.
- Exemplary CDR variants for 8D5 VL include:
- CDR2 DASNRAT (SEQ ID NO: 13)
- CDR3 QQRSNWPPIT (SEQ ID NO: 14)
- VL CDRs can be independently selected in any combination. Additionally, any X variation described herein can be independently selected in any combination, as long as the desired activity or binding ability is maintained.
- Exemplary CDR variants for 4C7 VH include:
- EWPYYYYEXDV wherein X is M, K, L, A, or F (SEQ ID NO:
- VH CDRs The X variations for the VH CDRs can be independently selected in any combination.
- a binding compound which consists essentially of a recited amino acid sequence may also include one or more amino acids that do not materially affect the properties of the binding compound.
- the present invention includes anti-BTLA antibodies and fragments thereof, such as those encoded by nucleic acids as described in Tables 1-2, or those that encode amino acid residues as described in Table 4, as well as nucleic acids which hybridize thereto.
- the nucleic acids hybridize under low stringency conditions, more preferably under moderate stringency conditions and most preferably under high stringency conditions and, preferably, exhibit BTLA binding activity.
- a nucleic acid molecule is "hybridizable" to another nucleic acid molecule, such as a cDNA, genomic DNA, or RNA, when a single stranded form of the nucleic acid molecule can anneal to the other nucleic acid molecule under the appropriate conditions of temperature and solution ionic strength (see Sambrook, et ah, supra).
- the conditions of temperature and ionic strength determine the "stringency" of the hybridization.
- Typical low stringency hybridization conditions include 55 0 C, 5X SSC, 0.1% SDS and no formamide; or 30% formamide, 5X SSC, 0.5% SDS at 42 0 C.
- Typical, moderate stringency hybridization conditions are similar to the low stringency conditions except the hybridization is carried out in 40% formamide, with 5X or 6X SSC and 0.1% SDS at 42 0 C.
- High stringency hybridization conditions are similar to low stringency conditions except the hybridization conditions are carried out in 50% formamide, 5X or 6X SSC at 42 0 C or, optionally, at a higher temperature (e.g., 57 0 C, 59 0 C, 6O 0 C, 62 0 C, 63 0 C, 65 0 C or 68 0 C).
- SSC is 0.15M NaCl and 0.015M Na-citrate.
- Hybridization requires that the two nucleic acids contain complementary sequences, although, depending on the stringency of the hybridization, mismatches between bases are possible.
- the appropriate stringency for hybridizing nucleic acids depends on the length of the nucleic acids and the degree of complementation, variables well known in the art. The greater the degree of similarity or homology between two nucleotide sequences, the higher the stringency under which the nucleic acids may hybridize. For hybrids of greater than 100 nucleotides in length, equations for calculating the melting temperature have been derived (see Sambrook, et al., supra, 9.50- 9.51).
- oligonucleotides For hybridization with shorter nucleic acids, i.e., oligonucleotides, the position of mismatches becomes more important, and the length of the oligonucleotide determines its specificity (see Sambrook, et al., supra, 11.7-11.8).
- nucleic acids comprising nucleotide sequences and polypeptides comprising amino acid sequences which are at least about 70% identical, preferably at least about 80% identical, more preferably at least about 90% identical and most preferably at least about 95% identical (e.g., 95%, 96%, 97%, 98%, 99%, 100%) to the reference nucleotide and amino acid sequences when the comparison is performed by a BLAST algorithm wherein the parameters of the algorithm are selected to give the largest match between the respective sequences over the entire length of the respective reference sequences.
- Polypeptides comprising amino acid sequences which are at least about 70% similar, preferably at least about 80% similar, more preferably at least about 90% similar and most preferably at least about 95% similar (e.g., 95%, 96%, 97%, 98%, 99%, 100%) to any of the reference amino acid sequences when the comparison is performed with a BLAST algorithm wherein the parameters of the algorithm are selected to give the largest match between the respective sequences over the entire length of the respective reference sequences, are also included in the present invention.
- Sequence identity refers to exact matches between the nucleotides or amino acids of two sequences which are being compared.
- Sequence similarity refers to both exact matches between the amino acids of two polypeptides which are being compared in addition to matches between nonidentical, biochemically related amino acids. Biochemically related amino acids which share similar properties and may be interchangeable are discussed above.
- the invention relates to an isolated nucleic acid, for example DNA, encoding the isolated antibodies or antigen binding fragment of the invention.
- the isolated nucleic acid encodes an agonist antibody or antigen binding fragment thereof comprising at least one mature antibody light chain variable (V L ) domain and at least one mature antibody heavy chain variable (VH) domain, wherein the V L domain comprises at least three CDRs having a sequence selected from SEQ ID NOs: 12-14, and the VH domain comprises at least at least three CDRs having a sequence selected from SEQ ID NOs: 5-7.
- the isolated nucleic acid encodes the mature light and heavy chain variable region sequences of SEQ ID No: 18 and SEQ ID NO:11, respectively.
- the isolated nucleic acid encodes both a light chain and a heavy chain on a single nucleic acid molecule, and in other embodiments the light and heavy chains are encoded on two or more separate nucleic acid molecules.
- the nucleic acids further encodes a signal sequence.
- This invention also provides expression vectors comprising the isolated nucleic acids of the invention, wherein the nucleic acid is operably linked to control sequences that are recognized by a host cell when the host cell is transfected with the vector. Also provided are host cells comprising an expression vector of the present invention. The invention further relates to methods of producing a binding compound of the present invention comprising culturing a host cell harboring an expression vector encoding the binding compound in culture medium, and isolating the binding compound from the host cell or culture medium.
- the invention also relates to antibodies or antigen binding fragments thereof that bind to the same epitope on human BTLA as antibody hu Mab8D5, hu Mab8A3, hu Mab21H6, or hu Mabl9A7 (i.e., an agonist antibody) or hu Mab4C7 (i.e., an antagonist antibody blocking binding with HVEM), for example antibodies that are able to cross-block binding of any of the antibodies of the present invention.
- the fully human antibodies of the invention bind human BTLA with a K D value of no more than about 100 nM (IxIO "7 M); preferably no more than about 1OnM; more preferably no more than about InM. Even more preferred are embodiments in which the antibodies have K D values of no more than about 200 pM (2xl0- 10 M), 100 pM, 50 pM, 20 pM, 10 pM, 5pM or even 2 pM.
- Any suitable method for generating antibodies may be used to generate the antibodies of the present invention.
- Any suitable form of the human BTLA can be used as the immunogen (antigen) for the generation of the antibodies.
- any human BTLA isoform or fragment thereof may be used as the immunogen. Examples include, but are not limited to, isoforms and splice variants of human BTLA as described herein.
- rhesus BTLA can be used as the immunogen for generation of the antibodies.
- BTLA are generated using transgenic mice carrying parts of the human immune system rather than the mouse system.
- These transgenic mice which may be referred to, herein, as "HuMAb” mice, contain a human immunoglobulin gene miniloci that encodes unrearranged human heavy ( ⁇ and ⁇ ) and K light chain immunoglobulin sequences, together with targeted mutations that inactivate the endogenous ⁇ and K chain loci (Lonberg, N., et al, (1994) Nature 368(6474): 856-859).
- mice exhibit reduced expression of mouse IgM or K, and in response to immunization, the introduced human heavy and light chain transgenes undergo class switching and somatic mutation to generate high affinity human IgG ⁇ monoclonal antibodies (Lonberg, N., et al., (1994), supra; reviewed in Lonberg, N. (1994) Handbook of Experimental Pharmacology 113:49-101; Lonberg, N., et al, (1995) Intern. Rev. Immunol. 13:65-93, and Harding, F., et al., (1995) Ann. N. Y Acad. Sci 764:536-546).
- HuMab mice The preparation of HuMab mice is commonly known in the art and is described, for example, in Taylor, L., et al., (1992) Nucleic Acids Research 20:6287-6295; Chen, J., et al, (1993) International Immunology 5: 647-656; Tuaillon, et al, (1993) Proc. Natl. Acad. Sci USA 90:3720-3724; Choi, et al, (1993) Nature Genetics 4:117-123; Chen, J., et al, (1993)EMBO J. 12: 821- 830; Tuaillon, et al, (1994) J Immunol.
- HuMab mice can be immunized with an antigenic BTLA polypeptide, preferably residues 31-152 of SEQ ID NO:35, as described by Lonberg, N., et al, (1994) Nature 368(6474): 856-859; Fishwild, D., et al, (1996) Nature Biotechnology 14: 845-851 and WO 98/24884.
- the mice will be 6-16 weeks of age upon the first immunization.
- a purified preparation of BTLA can be used to immunize the HuMab mice intraperitoneally and/or subcutaneously.
- mice can also be immunized with whole HEK293 or CHO cells which are stably transfected with a BTLA gene.
- An "antigenic BTLA polypeptide” may refer to a BTLA polypeptide or any fragment thereof, preferably any BTLA fragment which elicits an anti-BTLA immune response, preferably in HuMab mice.
- HuMAb transgenic mice respond well when initially immunized intraperitoneally (IP) and/or subcutaneously with antigen in MPL ® + TDM adjuvant (Sigma, Product No. M6536), followed by every other week or every two or three weeks IP immunizations (usually, up to a total of 6) with antigen in MPL ® + TDM adjuvant.
- Mice can be immunized, first, with cells expressing BTLA (e.g., stably transfected HEK293 or CHO cells), then with a soluble fragment of BTLA (e.g., residues 31-152 of SEQ K) NO:35) and continually receive alternating immunizations with the two antigens.
- BTLA e.g., stably transfected HEK293 or CHO cells
- the immune response can be monitored over the course of the immunization protocol with plasma samples being obtained by retroorbital bleeds.
- the plasma can be screened for the presence of anti-BTLA antibodies, for example by ELISA, and mice with sufficient titers of immunoglobulin can be used for fusions. Mice can be boosted intravenously with antigen 4 days before sacrifice and removal of the spleen. It is expected that 2-3 fusions for each antigen may need to be performed. Several mice can be immunized for each antigen.
- Hybridoma cells which produce the monoclonal, fully human anti-BTLA antibodies may be produced by methods which are commonly known in the art. These methods include, but are not limited to, the hybridoma technique originally developed by Kohler, et al, (1975) (Nature 256:495-497), as well as the trioma technique (Hering, et al, (1988) Biomed. Biochim. Acta. 47:211-216 and Hagiwara, et al, (1993) Hum. Antibod. Hybridomas 4:15), the human B-cell hybridoma technique (Kozbor, et al., (1983) Immunology Today 4:72 and Cote, et al, (1983) Proc. Natl.
- mice splenocytes are isolated and fused with PEG or by electrofusion to a mouse myeloma cell line based upon standard protocols. The resulting hybridomas may then be screened for the production of antigen-specific antibodies.
- single cell suspensions of splenic lymphocytes from immunized mice may by fused to one-sixth the number of P3X63- Ag8.653 nonsecreting mouse myeloma cells (ATCC, CRL 1580) with 50% PEG.
- Cells may be plated at approximately 2 x 10 5 cells/mL in a flat bottom microtiter plate, followed by a two week incubation in selective medium containing 20% fetal Clone Serum, 18% "653" conditioned media, 5% origen (IGEN), 4 mM L-glutamine, 1 mM L-glutamine, 1 mM sodium pyruvate, 5mM HEPES, 0.055 mM 2-mercaptoethanol, 50 units/ml penicillin, 50 mg/ml streptomycin, 50 mg/ml gentamycin and IX HAT (Sigma; the HAT is added 24 hours after the fusion). After two weeks, cells may be cultured in medium in which the HAT is replaced with HT.
- selective medium containing 20% fetal Clone Serum, 18% "653" conditioned media, 5% origen (IGEN), 4 mM L-glutamine, 1 mM L-glutamine, 1 mM sodium pyruvate, 5
- Individual wells may then be screened by ELISA for human anti- BTLA monoclonal IgG antibodies. Once extensive hybridoma growth occurs, medium can be observed usually after 10-14 days.
- the antibody secreting hybridomas may be replated, screened again, and if still positive for human IgG, anti-BTLA monoclonal antibodies, can be subcloned at least twice by limiting dilution.
- the stable subclones may then be cultured in vitro to generate small amounts of antibody in tissue culture medium for characterization.
- the anti-BTLA antibodies and antigen-binding fragments thereof of the present invention may also be produced recombinantly (e.g., in an E.colilTl expression system as discussed above).
- nucleic acids encoding the antibody molecules of the invention e.g., V H or V L
- V H or V L may be inserted into a pET-based plasmid and expressed in the E.colilTl system.
- Methods by which to produce recombinant antibodies which are known in the art.
- One example of a method for recombinant production of antibodies is disclosed in U.S. Patent No. 4,816,567. Transformation can be by any known method for introducing polynucleotides into a host cell.
- Methods for introduction of heterologous polynucleotides into mammalian cells include dextran-mediated transfection, calcium phosphate precipitation, polybrene-mediated transfection, protoplast fusion, electroporation, encapsulation of the polynucleotide(s) in liposomes, biolistic injection and direct microinjection of the DNA into nuclei.
- nucleic acid molecules may be introduced into mammalian cells by viral vectors. Methods of transforming cells are well known in the art. See, for example, U.S. Patent Nos. 4,399,216; 4,912,040; 4,740,461 and 4,959,455.
- Anti-BTLA antibodies can also be synthesized by any of the methods set forth in U.S. Patent No. 6,331,415.
- Mammalian cell lines available as hosts for expression are well known in the art and include many immortalized cell lines available from the American Type Culture Collection (ATCC). These include, inter alia, Chinese hamster ovary (CHO) cells, NSO, SP2 cells, HeLa cells, baby hamster kidney (BHK) cells, monkey kidney cells (COS), human hepatocellular carcinoma cells (e.g., Hep G2), A549 cells, 3T3 cells, HEK-293 cells and a number of other cell lines.
- Mammalian host cells include human, mouse, rat, dog, monkey, pig, goat, bovine, horse and hamster cells. Cell lines of particular preference are selected through determining which cell lines have high expression levels.
- insect cell lines such as Sf9 cells, amphibian cells, bacterial cells, plant cells and fungal cells.
- the antibodies are produced by culturing the host cells for a period of time sufficient to allow for expression of the antibody in the host cells or, more preferably, secretion of the antibody into the culture medium in which the host cells are grown.
- Antibodies can be recovered from the culture medium using standard protein purification methods. Further, expression of antibodies of the invention (or other moieties therefrom) from production cell lines can be enhanced using a number of known techniques. For example, the glutamine synthetase gene expression system (the GS system) is a common approach for enhancing expression under certain conditions. The GS system is discussed in whole or part in connection with European Patent Nos. 0 216 846, 0 256 055, and 0 323 997 and European Patent Application No. 89303964.4.
- the term "monoclonal antibody,” as used herein, refers to an antibody obtained from a population of substantially homogeneous antibodies, Le., the individual antibodies comprising the population are identical except for possible naturally occurring mutations that may be present in minor amounts. Monoclonal antibodies are highly specific, being directed against a single antigenic site. Monoclonal antibodies are advantageous in that they may be synthesized by a hybridoma culture, essentially uncontaminated by other immunoglobulins. The modifier “monoclonal” indicates the character of the antibody as being amongst a substantially homogeneous population of antibodies, and is not to be construed as requiring production of the antibody by any particular method. As mentioned above, the monoclonal antibodies to be used in accordance with the present invention may be made by the hybridoma method first described by Kohler, et al., (1975) Nature 256: 495.
- a polyclonal antibody is an antibody which was produced among or in the presence of one or more other, non-identical antibodies.
- polyclonal antibodies are produced from a B-lymphocyte in the presence of several other B-lymphocytes which produced non-identical antibodies.
- polyclonal antibodies are obtained directly from an immunized animal.
- a bispecific or bifunctional antibody is an artificial hybrid antibody having two different heavy/light chain pairs and two different binding sites. Bispecific antibodies can be produced by a variety of methods including fusion of hybridomas or linking of Fab' fragments. See, e.g., Songsivilai, et al, (1990) Clin. Exp. Immunol.
- bispecific antibodies may be formed as "diabodies” (Holliger, et al, (1993) PNAS USA 90:6444-6448) or as "Janusins” (Traunecker, et al, (1991) EMBO J. 10:3655-3659 and Traunecker, et al, (1992) Int. J. Cancer Suppl. 7:51-52).
- the present invention includes "chimeric antibodies"- an antibody which comprises a variable region of the present invention fused or chimerized with an antibody region (e.g., constant region) from another, non-human species (e.g., mouse, horse, rabbit, dog, cow, chicken). These antibodies may be used to modulate the expression or activity of BTLA in the non-human species.
- an antibody region e.g., constant region
- non-human species e.g., mouse, horse, rabbit, dog, cow, chicken.
- Single-chain Fv or “sFv” antibody fragments have the V H and V L domains of an antibody, wherein these domains are present in a single polypeptide chain.
- the sFv polypeptide further comprises a polypeptide linker between the VH and V L domains which enables the sFv to form the desired structure for antigen binding.
- Disulfide stabilized Fv fragments and “dsFv” refer to antibody molecules comprising a variable heavy chain (V H ) and a variable light chain (V L ) which are linked by a disulfide bridge.
- Antibody fragments within the scope of the present invention also include
- F(ab) 2 fragments which may be produced by enzymatic cleavage of an IgG by, for example, pepsin.
- Fab fragments may be produced by, for example, reduction of F(ab) 2 with dithiothreitol or mercaptoethylamine.
- a Fab fragment is a V L -C L chain appended to a V H -CH I chain by a disulfide bridge.
- a F(ab) 2 fragment is two Fab fragments which, in turn, are appended by two disulfide bridges.
- the Fab portion of an F(ab) 2 molecule includes a portion of the F c region between which disulfide bridges are located.
- An Fy fragment is a V L or V H region.
- immunoglobulins can be assigned to different classes. There are at least five major classes of immunoglobulins: IgA, IgD, IgE, IgG and IgM, and several of these may be further divided into subclasses (isotypes), e.g. IgG-I, IgG-2, IgG-3 and IgG-4; IgA-I and IgA-2.
- Engineered antibodies of the invention include those in which modifications have been made to framework residues within V H and/or V L , e.g. to improve the properties of the antibody. Typically such framework modifications are made to decrease the immunogenicity of the antibody. For example, one approach is to "backmutate" one or more framework residues to the corresponding germline sequence. More specifically, an antibody that has undergone somatic mutation can contain framework residues that differ from the germline sequence from which the antibody is derived. Such residues can be identified by comparing the antibody framework sequences to the germline sequences from which the antibody is derived.
- Table A shows regions where a framework region amino acid position (using Kabat numbering system) differs from the germline and how this position can be backmutated to the germline by the indicated substitutions:
- Another type of framework modification involves mutating one or more residues within the framework region, or even within one or more CDR regions, to remove T cell epitopes to thereby reduce the potential immunogenicity of the antibody. This approach is also referred to as “deimmunization” and is described in further detail in U.S. Patent Publication No. 20030153043.
- antibodies of the invention can be engineered to include modifications within the Fc region, typically to alter one or more functional properties of the antibody, such as serum half- life, complement fixation, Fc receptor binding, and/or antigen-dependent cellular cytotoxicity.
- an antibody of the invention can be chemically modified (e.g., one or more chemical moieties can be attached to the antibody) or be modified to alter its glycosylation, again to alter one or more functional properties of the antibody.
- the antibody is an IgG4 isotype antibody comprising a Serine to Proline mutation at a position corresponding to position 228 (S228P; EU index) in the hinge region of the heavy chain constant region.
- S228P Serine to Proline mutation at a position corresponding to position 228
- This mutation has been reported to abolish the heterogeneity of inter-heavy chain disulfide bridges in the hinge region (Angal et al. supra; position 241 is based on the Kabat numbering system).
- an anti-BTLA antibody of the invention can comprise the heavy chain variable region of 8D5 (SEQ ID NO: 9 or 11) or 4C7 (SEQ ID NO: 23 or 25) linked to a human IgG4 constant region in which the Serine at a position corresponding to position 241 as described in Angal et al., supra, has been mutated to Proline.
- 8D5 and 4C7 heavy chain variable regions linked to a human IgG4 constant region this mutation corresponds to an S228P mutation by the EU index.
- the hinge region of CHl is modified such that the number of cysteine residues in the hinge region is altered, e.g., increased or decreased.
- This approach is described further in U.S. Patent No. 5,677,425.
- the number of cysteine residues in the hinge region of CHl is altered to, for example, facilitate assembly of the light and heavy chains or to increase or decrease the stability of the antibody.
- the Fc hinge region of an antibody is mutated to decrease the biological half life of the antibody. More specifically, one or more amino acid mutations are introduced into the CH2-CH3 domain interface region of the Fc -hinge fragment such that the antibody has impaired Staphylococcyl protein A (SpA) binding relative to native Fc-hinge domain SpA binding.
- SpA Staphylococcyl protein A
- the antibody is modified to increase its biological half life.
- Various approaches are possible. For example, one or more of the following mutations can be introduced: T252L, T254S, T256F, as described in U.S. Patent No. 6,277,375.
- the antibody can be altered within the CHl or CL region to contain a salvage receptor binding epitope taken from two loops of a CH2 domain of an Fc region of an IgG, as described in U.S. Patent Nos. 5,869,046 and 6,121,022.
- the Fc region is altered by replacing at least one amino acid residue with a different amino acid residue to alter the effector function(s) of the antibody.
- one or more amino acids selected from amino acid residues 234, 235, 236, 237, 297, 318, 320 and 322 can be replaced with a different amino acid residue such that the antibody has an altered affinity for an effector ligand but retains the antigen-binding ability of the parent antibody.
- the effector ligand to which affinity is altered can be, for example, an Fc receptor or the Cl component of complement. This approach is described in further detail in U.S. Patent Nos. 5,624,821 and 5,648,260.
- amino acids selected from amino acid residues are selected from amino acid residues
- 329, 331 and 322 can be replaced with a different amino acid residue such that the antibody has altered CIq binding and/or reduced or abolished complement dependent cytotoxicity (CDC). This approach is described in further detail in U.S. Patent No. 6,194,551.
- one or more amino acid residues within amino acid positions 231 and 239 are altered to thereby alter the ability of the antibody to fix complement. This approach is described further in PCT Publication WO 94/29351.
- the Fc region is modified to increase the ability of the antibody to mediate antibody dependent cellular cytotoxicity (ADCC) and/or to increase the affinity of the antibody for an Fc ⁇ receptor by modifying one or more amino acids at the following positions: 238, 239, 248, 249, 252, 254, 255, 256, 258, 265, 267, 268, 269, 270, 272, 276, 278, 280, 283, 285, 286, 289, 290, 292, 293, 294, 295, 296, 298, 301, 303, 305, 307, 309, 312, 315, 320, 322, 324, 326, 327, 329, 330, 331, 333, 334, 335, 337, 338, 340, 360, 373, 376, 378, 382, 388, 389, 398, 414, 416, 419, 430, 434, 435, 437, 438 or 439.
- ADCC antibody dependent cellular cytotoxicity
- the glycosylation of an antibody is modified.
- an aglycosylated antibody can be made (Le., the antibody lacks glycosylation).
- Glycosylation can be altered to, for example, increase the affinity of the antibody for antigen.
- carbohydrate modifications can be accomplished by, for example, altering one or more sites of glycosylation within the antibody sequence.
- one or more amino acid substitutions can be made that result in elimination of one or more variable region framework glycosylation sites to thereby eliminate glycosylation at that site.
- Such aglycosylation may increase the affinity of the antibody for antigen. See, e.g., U.S. Patent Nos. 5,714,350 and 6,350,861.
- an antibody can be made that has an altered type of glycosylation, such as a hypofucosylated antibody having reduced amounts of fucosyl residues or an antibody having increased bisecting GlcNac structures.
- altered glycosylation patterns have been demonstrated to increase the ADCC ability of antibodies.
- carbohydrate modifications can be accomplished by, for example, expressing the antibody in a host cell with altered glycosylation machinery. Cells with altered glycosylation machinery have been described in the art and can be used as host cells in which to express recombinant antibodies of the invention to thereby produce an antibody with altered glycosylation.
- the cell lines Ms704, Ms705, and Ms709 lack the fucosyltransferase gene, FUT8 ( ⁇ (l,6)-fucosyltransferase), such that antibodies expressed in the Ms704, Ms705, and Ms709 cell lines lack fucose on their carbohydrates.
- the Ms704, Ms705, and Ms709 FUT8 " ' " cell lines were created by the targeted disruption of the FUT8 gene in CHO/DG44 cells using two replacement vectors (see U.S. Patent Publication No. 20040110704 and Yamane-Ohnuki et al. (2004) Biotechnol Bioeng 87:614-22).
- EP 1,176,195 describes a cell line with a functionally disrupted FUT8 gene, which encodes a fucosyl transferase, such that antibodies expressed in such a cell line exhibit hypofucosylation by reducing or eliminating the ⁇ -1,6 bond-related enzyme.
- EP 1,176,195 also describes cell lines which have a low enzyme activity for adding fucose to the N- acetylglucosamine that binds to the Fc region of the antibody or does not have the enzyme activity, for example the rat myeloma cell line YB2/0 (ATCC CRL 1662).
- PCT Publication WO 03/035835 describes a variant CHO cell line, Lecl3 cells, with reduced ability to attach fucose to Asn(297)-linked carbohydrates, also resulting in hypofucosylation of antibodies expressed in that host cell (see also Shields et al. (2002) /. Biol. Chem. 277:26733-26740).
- Antibodies with a modified glycosylation profile can also be produced in chicken eggs, as described in PCT Publication WO 06/089231.
- antibodies with a modified glycosylation profile can be produced in plant cells, such as Lemna (US Patent 7,632,983). Methods for production of antibodies in a plant system are disclosed in the U.S.
- PCT Publication WO 99/54342 describes cell lines engineered to express glycoprotein-modifying glycosyl transferases (e.g., ⁇ (l,4)-N- acetylglucosaminyltransferase III (GnTIII)) such that antibodies expressed in the engineered cell lines exhibit increased bisecting GlcNac structures which results in increased ADCC activity of the antibodies (see also Umana et al. (1999) Nat. Biotech. 12:176-180).
- glycoprotein-modifying glycosyl transferases e.g., ⁇ (l,4)-N- acetylglucosaminyltransferase III (GnTIII)
- the fucose residues of the antibody can be cleaved off using a fucosidase enzyme; e.g., the fucosidase ⁇ -L-fucosidase removes fucosyl residues from antibodies (Tarentino et al. (1975) Biochem. 14:5516-23).
- a fucosidase enzyme e.g., the fucosidase ⁇ -L-fucosidase removes fucosyl residues from antibodies (Tarentino et al. (1975) Biochem. 14:5516-23).
- An antibody can be pegylated to, for example, increase the biological ⁇ e.g., serum) half life of the antibody.
- the antibody, or fragment thereof typically is reacted with polyethylene glycol (PEG), such as a reactive ester or aldehyde derivative of PEG, under conditions in which one or more PEG groups become attached to the antibody or antibody fragment.
- PEG polyethylene glycol
- the pegylation is carried out via an acylation reaction or an alkylation reaction with a reactive PEG molecule (or an analogous reactive water-soluble polymer).
- polyethylene glycol is intended to encompass any of the forms of PEG that have been used to derivatize other proteins, such as mono (Cl-ClO) alkoxy- or aryloxy-polyethylene glycol or polyethylene glycol-maleimide.
- the antibody to be pegylated is an aglycosylated antibody. Methods for pegylating proteins are known in the art and can be applied to the antibodies of the invention. See, e.g., EP 0 154 316 and EP 0 401 384.
- Antibodies of this disclosure can be characterized by their various physical properties, to detect and/or differentiate different classes thereof.
- Antibodies of the present disclosure can contain one or more glycosylation sites in either the light or heavy chain variable region. Such glycosylation sites may result in increased immunogenicity of the antibody or an alteration of the pK of the antibody due to altered antigen binding (Marshall et al (1972) Annu Rev Biochem 4J . :673-702; Gala and Morrison (2004) J Immunol 172:5489-94; Wallick et al (1988) J Exp Med 168:1099-109; Spiro (2002) Glycobiology 12:43R-56R; Parekh et al (1985) Nature 316:452-7; Mimura et al. (2000) MoI Immunol 37:697-706).
- Glycosylation has been known to occur at motifs containing an N- X-S/T sequence.
- an anti-BTLA antibody that does not contain variable region glycosylation. This can be achieved either by selecting antibodies that do not contain the glycosylation motif in the variable region or by mutating residues within the glycosylation region.
- the antibodies of the present disclosure do not contain asparagine isomerism sites.
- the deamidation of asparagine may occur on N-G or D-G sequences and result in the creation of an isoaspartic acid residue that introduces a kink into the polypeptide chain and decreases its stability (isoaspartic acid effect).
- Each antibody will have a unique isoelectric point (pi), which generally falls in the pH range between 6 and 9.5.
- the pi for an IgGl antibody typically falls within the pH range of 7-9.5 and the pi for an IgG4 antibody typically falls within the pH range of 6-8.
- an anti-BTLA antibody that contains a pi value that falls in the normal range. This can be achieved either by selecting antibodies with a pi in the normal range or by mutating charged surface residues.
- each antibody will have a characteristic melting temperature, with a higher melting temperature indicating greater overall stability in vivo (Krishnamurthy R and Manning MC (2002) Curr Pharm Biotechnol 3:361-71).
- the T M1 the temperature of initial unfolding
- the melting point of an antibody can be measured using differential scanning calorimetry (Chen et al (2003) Pharm Res 20:1952-60; Ghirlando et al (1999) Immunol Lett 68:47-52) or circular dichroism (Murray et al. (2002) J. Chromatogr Sci 40:343-9).
- antibodies are selected that do not degrade rapidly.
- Degradation of an antibody can be measured using capillary electrophoresis (CE) and MALDI- MS (Alexander AJ and Hughes DE (1995) Anal Chem 67:3626-32).
- CE capillary electrophoresis
- MALDI- MS Alexander AJ and Hughes DE (1995) Anal Chem 67:3626-32).
- antibodies are selected that have minimal aggregation effects, which can lead to the triggering of an unwanted immune response and/or altered or unfavorable pharmacokinetic properties.
- antibodies are acceptable with aggregation of 25% or less, preferably 20% or less, even more preferably 15% or less, even more preferably 10% or less and even more preferably 5% or less.
- Aggregation can be measured by several techniques, including size-exclusion column (SEC), high performance liquid chromatography (HPLC), and light scattering.
- the anti-BTLA antibody molecules of the invention may also be conjugated to a chemical moiety.
- the chemical moiety may be, inter alia, a polymer, a radionuclide or a cytotoxic factor.
- the chemical moiety is a polymer which increases the half -life of the antibody molecule in the body of a subject.
- Suitable polymers include, but are not limited to, polyethylene glycol (PEG) (e.g., PEG with a molecular weight of 2kDa, 5 kDa, 10 kDa, 12kDa, 20 kDa, 3OkDa or 4OkDa), dextran and monomethoxypolyethylene glycol (mPEG).
- the antibodies and antibody fragments of the invention may also be conjugated with labels such as 99 Tc 5 90 Y, 111 In, 32 P, 14 C, 125 I, 3 H, 131 I, 11 C, 15 O, 13 N, 18 F, 35 S, 51 Cr, 57 To,
- the antibodies and antibody fragments of the invention may also be conjugated with fluorescent or chemilluminescent labels, including fluorophores such as rare earth chelates, fluorescein and its derivatives, rhodamine and its derivatives, isothiocyanate, phycoerythrin, phycocyanin, allophycocyanin, o-phthaladehyde, fluorescamine, 152 Eu, dansyl, umbelliferone, luciferin, luminal label, isoluminal label, an aromatic acridinium ester label, an imidazole label, an acridimium salt label, an oxalate ester label, an aequorin label, 2,3- dihydrophthalazinediones, biotin/avidin, spin labels and stable free radicals.
- fluorophores such as rare earth chelates, fluorescein and its derivatives, rhodamine and its derivatives, isothiocyanate, phycoerythr
- the antibody molecules may also be conjugated to a cytotoxic factor such as diptheria toxin, Pseudomonas aeruginosa exotoxin A chain , ricin A chain, abrin A chain, modeccin A chain, alpha-sarcin, Aleurites fordii proteins and compounds (e.g., fatty acids), dianthin proteins, Phytolacca americana proteins PAPI, PAPII, and PAP-S, momordica charantia inhibitor, curcin, crotin, saponaria officinalis inhibitor, mitogellin, restrictocin, phenomycin, and enomycin.
- a cytotoxic factor such as diptheria toxin, Pseudomonas aeruginosa exotoxin A chain , ricin A chain, abrin A chain, modeccin A chain, alpha-sarcin, Aleurites fordii proteins and compounds (e.g., fatty acids),
- different constant domains may be appended to humanized V L and VH regions derived from the CDRs provided herein.
- a heavy chain constant domain other than IgGl may be used, or hybrid IgGl/IgG4 may be utilized.
- IgGl antibodies provide for long half-life and for effector functions, such as complement activation and antibody-dependent cellular cytotoxicity, such activities may not be desirable for all uses of the antibody.
- an IgG4 constant domain for example, may be used.
- the IgG4 constant domain differs from the native human IgG4 constant domain (Swiss-Prot Accession No.
- the invention also provides methods of treating subjects, including human subjects, in need of treatment with the isolated antibodies or antigen binding fragment thereof with the antibody or antigen binding fragment thereof, preferably a fully human antibody, of the present invention.
- Such subjects may have an inflammatory or autoimmune disorder, such as inflammatory bowel disorders (e.g., Crohn's disease, ulcerative colitis, and inflammatory bowel disease), inflammatory fibrosis (e.g., scleroderma, lung fibrosis, and cirrhosis), rheumatoid arthritis (RA), osteoarthritis, osteoporosis, asthma (including allergic asthma), allergies, chronic obstructive pulmonary disease (COPD), multiple sclerosis, psoriasis, uveitis, graft versus host disease (GVHD), juvenile early-onset Type I diabetes, transplant rejection, SLE, and Sjogren's syndrome.
- inflammatory or autoimmune disorder such as inflammatory bowel disorders (e.g., Crohn's disease, ulcerative colitis
- Such methods of treatment may further comprise administering one or more additional therapeutic agents, such as immunosuppressive or anti-inflammatory agents.
- additional therapeutic agents such as immunosuppressive or anti-inflammatory agents.
- inflammatory bowel disorders are treated by the methods described herein.
- Crohn's disease and ulcerative colitis are treated by the methods described herein.
- IBD Inflammatory Bowel Disease
- IBD is the name for a group of disorders (e.g. Crohn's disease and ulcerative colitis) in which the intestines become inflamed, resulting in abdominal cramps and pain, diarrhea, weight loss and intestinal bleeding. IBD affects over 600,000 Americans.
- Conventional treatment options include sulfasalazine, corticosteroids (e.g. prednisone), immune system suppressors such as azathioprine and mercaptopurine, or an antibiotic (e.g., metronidazole) for Crohn's disease.
- Therapeutic monoclonal antibody treatments include etanercept, natalizumab and infliximab.
- the anti-BTLA antibodies of the present invention may be used to treat IBD in subjects in need of such treatment.
- the anti-BTLA antibodies of the present invention may also be combined with other treatments for IBD, e.g. IL-IO (see U.S. Pat. Nos. 5,368,854, 7,052,686), steroids and sulfasalazine.
- GVHD graft-versus-host disease
- the recipient is immunologically disparate - histoincompatible
- T cells present in the graft attack the tissues of the transplant recipient after perceiving host tissues as antigenically foreign.
- the T cells produce an excess of cytokines, including TNF alpha and interferon-gamma (IFNg).
- IFNg interferon-gamma
- HLAs human leukocyte antigens
- graft-versus-host disease can occur even when HLA-identical siblings are the donors.
- HLA-identical siblings or HLA-identical unrelated donors often have genetically different proteins (i.e., minor histocompatibility antigens) that can be presented by MHC molecules to the recipient's T-cells, which see these antigens as foreign and so mount an immune response.
- minor histocompatibility antigens i.e., minor histocompatibility antigens
- BTLA agonist antibodies are expected to inhibit the activation, proliferation and effector function of grafted T and B cells that react to allogeneic antigens (including, but not limited to minor and major histocompatibility antigens) present in tissues of the recipient or host. Inhibition of these graft derived T and B cells is expected to occur by virtue of their expression of BTLA on the cell surface. While not being bound by theory, a BTLA agonist antibody is expected to inhibit pathogenic immune responses by 'forced engagement'. BTLA agonist antibodies may inhibit pathogenic immune responses indirectly for instance through the activation of other inhibitory cells such as regulatory T cells, or through modulation of antigen-presenting cells.
- BTLA agonist antibodies are expected to suppress or inhibit anti-host responses by lymphocytes originating from the graft either alone or in combination with other immune suppressive agents, used to prevent or treat the symptoms of graft versus host disease.
- the invention also relates to methods of treatment comprising administration of a therapeutically effective amount of an anti-BTLA antibody or antigen binding fragment thereof in combination with one or more other therapeutic agents.
- the one or more therapeutic agents include anti- IL- 23,
- IL- l ⁇ , IL-6, TGF- ⁇ , CTLA4 fusion proteins and small molecule antiinflammatories, such as mycophenolate mofetil methotrexate (See, e.g., Veldhoen (2006) Immunity 24:179-189; Dong
- the one or more other therapeutic agents is administered before, concurrently with, or after the anti-BTLA antibody or antigen binding fragment thereof.
- the anti-BTLA antibody or antigen binding fragment thereof can be administered in combination with immunosuppressive drugs used to treat transplant rejection including any combination of one or more of the following:
- calcineurin inhibitors e.g., ciclosporin and tacrolimus
- mTOR inhibitors e.g., sirolimus and everolimus
- anti-proliferatives e.g., azathioprine and mycophenolic acid
- corticosteroids e.g., prednisolone and hydrocortisone
- antibodies with immunosuppressive effects e.g., monoclonal anti-IL-2R ⁇ receptor antibodies including basiliximab and daclizumab
- polyclonal anti-T-cell antibodies e.g., anti-thymocyte globulin (ATG) and anti-lymphocyte globulin (ALG)
- ATG anti-thymocyte globulin
- ALG anti-lymphocyte globulin
- the invention also relates to compositions and formulations of the antibodies or antigen binding fragment thereof the present invention, comprising the binding compound and a pharmaceutically acceptable carrier or diluent, and optionally one or more immunosuppressive or anti-inflammatory agents.
- the antibodies and fragments of the invention may be used as affinity purification agents.
- the antibodies or fragments are immobilized on a solid phase such a Sephadex resin or filter paper, using methods well known in the art.
- the immobilized antibody or fragment is contacted with a sample containing the BTLA protein (or fragment thereof) to be purified, and thereafter the support is washed with a suitable solvent that will remove substantially all the material in the sample except the BTLA protein, which is bound to the immobilized antibody or fragment. Finally, the support is washed with a solvent which elutes the bound BTLA from the column (e.g., protein A).
- a solvent which elutes the bound BTLA from the column e.g., protein A
- the present invention also provides antigens for generating secondary antibodies which are useful for example for performing Western blots and other immunoassays discussed herein.
- the present invention includes polypeptides comprising the variable regions and/or CDR sequences which may be used to generate an anti-BTLA or anti- BTLA secondary antibody.
- Detectably labeled anti-hu Mab8D5, hu Mab8A3, hu Mab21H6, hu Mabl9A7, hu Mab4C7 or anti-Mab8D5, hu Mab8A3, hu Mab21H6, hu Mabl9A7, hu Mab4C7 secondary antibodies are within the scope of the present invention.
- Anti-BTLA antibodies or fragments thereof may also be useful in diagnostic assays for BTLA protein, e.g., detecting its expression in specific cells, tissues, or serum. Such diagnostic methods may be useful in various disease diagnoses.
- embodiments of the invention include ELISA assays (enzyme- linked immunosorbent assay) incorporating the use of an anti-BTLA antibody or fragment thereof of the invention.
- ELISA assays enzyme- linked immunosorbent assay
- such a method comprises the following steps:
- a substrate e.g., surface of a microtiter plate well, e.g., a plastic plate
- a substrate e.g., surface of a microtiter plate well, e.g., a plastic plate
- detectably labeled antibodies e.g., enzyme-linked antibodies
- detectably labeled antibodies e.g., enzyme-linked antibodies
- the labeled antibody is labeled with peroxidase which react with ABTS (e.g., 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid)) or 3,3',5,5'-Tetramethylbenzidine to produce a color change which is detectable.
- the labeled antibody is labeled with a detectable radioisotope (e.g., 3 H) which can be detected by scintillation counter in the presence of a scintillant.
- An anti-BTLA antibody of the invention may be used in a Western blot or immuno protein blot procedure. Such a procedure forms part of the present invention and includes e.g.,:
- a membrane or other solid substrate to be tested for the presence of bound BTLA or a fragment thereof with an anti-BTLA antibody or antigen-binding fragment thereof of the invention may take the form of a nitrocellulose or vinyl-based (e.g., polyvinylidene fluoride (PVDF)) membrane to which proteins to be tested for the presence of BTLA in a non-denaturing PAGE (polyacrylamide gel electrophoresis) gel or SDS-PAGE (sodium dodecyl sulfate polyacrylamide gel electrophoresis) gel have been transferred (e.g., following electrophoretic separation in the gel).
- the membrane is optionally blocked, e.g., with nonfat dry milk or the like so as to bind non-specific protein binding sites on the membrane.
- Detection of the bound antibody or fragment may be by binding the antibody or fragment with a secondary antibody (an anti-immunoglobulin antibody) which is detectably labeled and, then, detecting the presence of the secondary antibody.
- a secondary antibody an anti-immunoglobulin antibody
- the anti-BTLA antibodies and antigen-binding fragments thereof of the invention may also be used for immunohistochemistry.
- Such a method forms part of the present invention and comprises, e.g., (1) contacting a cell to be tested for the presence of BTLA with an anti-BTLA antibody or antigen-binding fragment thereof of the invention; and (2) detecting the antibody or fragment on or in the cell.
- the antibody or fragment itself is detectably labeled, it can be detected directly. Alternatively, the antibody or fragment may be bound by a detectably labeled secondary antibody which is detected.
- Certain anti-BTLA antagonist antibodies and antigen-binding fragments thereof of the invention may also be used for in vivo tumor imaging.
- Such a method forms part of the present invention and may include injection of a radiolabeled anti-BTLA antibody or antigen- binding fragment thereof of the invention into the body of a patient to be tested for the presence of a tumor associated with BTLA expression followed by nuclear imaging of the body of the patient to detect the presence of the labeled antibody or fragment e.g., at loci comprising a high concentration of the antibody or fragment which are bound to the tumor.
- Imaging techniques include SPECT imaging (single photon emission computed tomography) or PET imaging (positron emission tomography).
- Labels include e.g., iodine- 123 ( 123 I) and technetium-99m ( 99m Tc), e.g., in conjunction with SPECT imaging or 11 C, 13 N, 15 O or 18 F, e.g., in conjunction with PET imaging or Indium-I l l (See e.g., Gordon et al., (2005) International Rev. Neurobiol. 67:385-440).
- kits comprising the components of the combinations of the invention in kit form.
- a kit of the present invention includes one or more components including, but not limited to, a binding composition, as discussed herein, which specifically binds BTLA (e.g., agonist antibodies hu Mab8D5, hu Mab8A3, hu Mab21H6, or hu Mabl9A7, or antagonist antibody hu Mab4C7) in association with one or more additional components including, but not limited to a pharmaceutically acceptable carrier and/or a chemotherapeutic agent, as discussed herein.
- the binding composition and/or the chemotherapeutic agent can be formulated as a pure composition or in combination with a pharmaceutically acceptable carrier, in a pharmaceutical composition.
- a kit includes a binding composition of the invention (e.g., agonist antibodies hu Mab8D5, hu Mab8A3, hu Mab21H6, or hu Mabl9A7, or antagonist antibody hu Mab4C7) or a pharmaceutical composition thereof in one container (e.g., in a sterile glass or plastic vial) and a pharmaceutical composition thereof and/or a chemotherapeutic agent in another container (e.g., in a sterile glass or plastic vial).
- a binding composition of the invention e.g., agonist antibodies hu Mab8D5, hu Mab8A3, hu Mab21H6, or hu Mabl9A7, or antagonist antibody hu Mab4C7 or a pharmaceutical composition thereof in one container (e.g., in a sterile glass or plastic vial) and a pharmaceutical composition thereof and/or a chemotherapeutic agent in another container (e.g., in a sterile glass or
- the kit comprises a combination of the invention, including a binding composition component (e.g., agonist antibodies hu Mab8D5, hu Mab8A3, hu Mab21H6, or hu Mabl9A7, or antagonist antibody hu Mab4C7) along with a pharmaceutically acceptable carrier, optionally in combination with one or more chemotherapeutic agent component formulated together, optionally, in a pharmaceutical composition, in a single, common container.
- a binding composition component e.g., agonist antibodies hu Mab8D5, hu Mab8A3, hu Mab21H6, or hu Mabl9A7, or antagonist antibody hu Mab4C7
- a pharmaceutically acceptable carrier optionally in combination with one or more chemotherapeutic agent component formulated together, optionally, in a pharmaceutical composition, in a single, common container.
- the kit can include a device for performing such administration.
- the kit can include one or more hypodermic needles or other injection devices as discussed above.
- the kit can include a package insert including information concerning the pharmaceutical compositions and dosage forms in the kit.
- information concerning the pharmaceutical compositions and dosage forms in the kit aids patients and physicians in using the enclosed pharmaceutical compositions and dosage forms effectively and safely.
- the following information regarding a combination of the invention may be supplied in the insert: pharmacokinetics, pharmacodynamics, clinical studies, efficacy parameters, indications and usage, contraindications, warnings, precautions, adverse reactions, overdosage, proper dosage and administration, how supplied, proper storage conditions, references, manufacturer/distributor information and patent information.
- the antibody is admixed with a pharmaceutically acceptable carrier or excipient.
- a pharmaceutically acceptable carrier or excipient See, e.g., Remington's Pharmaceutical Sciences and U.S. Pharmacopeia: National Formulary, Mack Publishing Company, Easton, PA (1984).
- Formulations of therapeutic and diagnostic agents may be prepared by mixing with acceptable carriers, excipients, or stabilizers in the form of, e.g., lyophilized powders, slurries, aqueous solutions or suspensions (see, e.g., Hardman, et al. (2001) Goodman and Gilman's The Pharmacological Basis of Therapeutics, McGraw-Hill, New York, NY; Gennaro (2000) Remington: The Science and Practice of Pharmacy, Lippincott, Williams, and Wilkins, New York, NY; Avis, et al. (eds.) (1993) Pharmaceutical Dosage Forms: Parenteral Medications, Marcel Dekker, NY; Lieberman, et al.
- anti-BTLA antibodies of the present invention are diluted to an appropriate concentration in a sodium acetate solution pH 5-6, and NaCl or sucrose is added for tonicity. Additional agents, such as polysorbate 20 or polysorbate 80, may be added to enhance stability.
- Toxicity and therapeutic efficacy of the antibody compositions, administered alone or in combination with another agent can be determined by standard pharmaceutical procedures in cell cultures or experimental animals, e.g., for determining the LDs 0 (the dose lethal to 50% of the population) and the ED 50 (the dose therapeutically effective in 50% of the population).
- the dose ratio between toxic and therapeutic effects is the therapeutic index (LD 50 / ED 50 ).
- Antibodies exhibiting high therapeutic indices are preferred.
- the data obtained from these cell culture assays and animal studies can be used in formulating a range of dosage for use in human.
- the dosage of such compounds lies preferably within a range of circulating concentrations that include the ED 50 with little or no toxicity.
- the dosage may vary within this range depending upon the dosage form employed and the route of administration.
- the mode of administration can vary. Suitable routes of administration include oral, rectal, transmucosal, or intestinal administration; parenteral delivery, including intramuscular, subcutaneous, intramedullary injections, as well as intrathecal, direct intraventricular, intravenous, intraperitoneal, intranasal, or intraocular injections. Administration can be carried out in a variety of conventional ways, such as oral ingestion, inhalation, insufflation, topical application or cutaneous, transdermal, subcutaneous, intraperitoneal, parenteral, intra-arterial or intravenous injection. Intravenous administration to the patient is preferred.
- the liposomes will be targeted to and taken up selectively by the afflicted tissue.
- the administration regimen depends on several factors, including the serum or tissue turnover rate of the therapeutic antibody, the level of symptoms, the immunogenicity of the therapeutic antibody, and the accessibility of the target cells in the biological matrix.
- the administration regimen delivers sufficient therapeutic antibody to effect improvement in the target disease state, while simultaneously minimizing undesired side effects.
- the amount of biologic delivered depends in part on the particular therapeutic antibody and the severity of the condition being treated. Guidance in selecting appropriate doses of therapeutic antibodies is available (see, e.g., Wawrzynczak (1996) Antibody Therapy, Bios Scientific Pub.
- Determination of the appropriate dose is made by the clinician, e.g., using parameters or factors known or suspected in the art to affect treatment. Generally, the dose begins with an amount somewhat less than the optimum dose and it is increased by small increments thereafter until the desired or optimum effect is achieved relative to any negative side effects.
- Important diagnostic measures include those of symptoms of, e.g., the inflammation or level of inflammatory cytokines produced.
- a biologic that will be used is derived from the same species as the animal targeted for treatment, thereby minimizing an inflammatory, autoimmune, or proliferative response to the reagent. In the case of human subjects, for example, chimeric, humanized and fully human antibodies are preferred.
- Antibodies, antibody fragments, and cytokines can be provided by continuous infusion, or by doses administered, e.g., daily, 1-7 times per week, weekly, bi-weekly, monthly, bimonthly etc. Doses may be provided intravenously, subcutaneously, topically, orally, nasally, rectally, intramuscular, intracerebrally, intraspinally, or by inhalation.
- a total weekly dose is generally at least 0.05 ⁇ g/kg body weight, more generally at least 0.2 ⁇ g/kg, 0.5 ⁇ g/kg, 1 ⁇ g/kg, 10 ⁇ g/kg, 100 ⁇ g/kg, 0.25 mg/kg, 1.0 mg/kg, 2.0 mg/kg, 5.0 mg/ml, 10 mg/kg, 25 mg/kg, 50 mg/kg or more (see, e.g., Yang, er ⁇ /. (2003) New Engl. J. Med. 349:427-434; Herold, et al. (2002) New Engl. J. Med. 346: 1692-1698; Liu, et al. (1999) /. Neurol. Neurosurg. Psych.
- Doses may also be provided to achieve a pre-determined target concentration of anti- BTLA antibody in the subject's serum, such as 0.1, 0.3, 1, 3, 10, 30, 100, 300 ⁇ g/ml or more.
- a fully human BTLA antibody of the present invention is administered subcutaneous Iy or intravenously, on a weekly, biweekly or "every 4 weeks" basis at 10, 20, 50, 80, 100, 200, 500, 1000 or 2500 mg/subject.
- inhibit or “treat” or “treatment” includes a postponement of development of the symptoms associated with a disorder and/or a reduction in the severity of the symptoms of such disorder.
- the terms further include ameliorating existing uncontrolled or unwanted symptoms, preventing additional symptoms, and ameliorating or preventing the underlying causes of such symptoms.
- the terms denote that a beneficial result has been conferred on a vertebrate subject with a disorder, disease or symptom, or with the potential to develop such a disorder, disease or symptom.
- a therapeutically effective amount refers to an amount of a BTLA binding compound of the invention that, when administered alone or in combination with an additional therapeutic agent to a cell, tissue, or subject, is effective to prevent or ameliorate one or more symptoms of a disease or condition or the progression of such disease or condition.
- a therapeutically effective dose further refers to that amount of the binding compound sufficient to result in amelioration of symptoms, e.g., treatment, healing, prevention or amelioration of the relevant medical condition, or an increase in rate of treatment, healing, prevention or amelioration of such conditions.
- a therapeutically effective dose refers to that ingredient alone.
- a therapeutically effective dose refers to combined amounts of the active ingredients that result in the therapeutic effect, whether administered in combination, serially or simultaneously.
- An effective amount of a therapeutic will result in an improvement of a diagnostic measure or parameter by at least 10%; usually by at least 20%; preferably at least about 30%; more preferably at least 40%, and most preferably by at least 50%.
- a second therapeutic agent e.g., cytokine, another therapeutic antibody, steroid, chemotherapeutic agent, or antibiotic are well known in the art, see, e.g., Hardman, et al.
- the pharmaceutical composition of the invention may also contain immunosuppressive or immunomodulating agents.
- any suitable immunosuppressive agent can be employed, including but not limited to antiinflammatory agents, corticosteroids, cyclosporine, tacrolimus (i.e., FK-506), sirolimus, interferons, soluble cytokine receptors (e.g., sTNRF and sIL-lR), agents that neutralize cytokine activity (e.g., inflixmab, etanercept), mycophenolate mofetil, 15-deoxyspergualin, thalidomide, glatiramer, azathioprine, leflunomide, cyclophosphamide, methotrexate, and the like.
- the pharmaceutical composition can also be employed with other therapeutic modalities such as phototherapy and radiation.
- the BTLA binding compounds of the present invention can also be used in combination with one or more agonists or antagonists of other cytokines (e.g. antibodies), including but not limited to, IL-23, IL-l ⁇ , IL-6, CTLA-4, CTLA-4/Ig fusion, and TGF- ⁇ . See, e.g., Veldhoen (2006) Immunity 24:179-189; Dong (2006) Nat. Rev. Immunol. 6(4):329-333.
- the BTLA binding compound of the invention is administered before, concurrently with, or after administration of the another agonist/s or antagonist/s.
- a BTLA binding compound of the present invention is used in treatment of the acute early phase of an adverse immune response (e.g. MS, Crohn's Disease, juvenile early- onset type I diabetes) alone or in combination with an IL-23 antagonist.
- an adverse immune response e.g. MS, Crohn's Disease, juvenile early- onset type I diabetes
- the BTLA binding compound may be gradually decreased and treatment with the antagonist of IL- 23 alone is continued to maintain suppression of the adverse response.
- antagonists to IL- l ⁇ , IL-6 and/or TGF- ⁇ may be administered concurrently, before or after an BTLA binding compound of the present invention. See Cua and Kastelein (2006) Nat. Immunol. 7:557-559; Tato and O'Shea (2006) Nature 441:166-168; Iwakura and Ishigame (2006) /. Clin. Invest. 116:1218-1222.
- Typical veterinary, experimental, or research subjects include monkeys, dogs, cats, rats, mice, rabbits, guinea pigs, horses, and humans. USES .
- the present invention provides methods for using engineered anti-BTLA antibodies for the treatment and diagnosis of inflammatory disorders and conditions, as well as autoimmune and proliferative disorders.
- Methods are provided for the diagnosis, prevention or treatment of inflammatory bowel disease (IBD), multiple sclerosis (MS), chronic obstructive pulmonary disease (COPD), cystic fibrosis (CF), psoriasis, systemic scleroderma, GVHD, allograft rejection, SLE, Sjogren's syndrome, juvenile early-onset type I diabetes autoimmune myocarditis and peritoneal adhesions (See, e.g., Chung et al. (2002) /. Exp. Med. 195:1471- 78).
- IBD inflammatory bowel disease
- MS multiple sclerosis
- COPD chronic obstructive pulmonary disease
- COPD cystic fibrosis
- psoriasis systemic scleroderma
- GVHD allograft rejection
- the antibody or antigen binding fragments of the invention which specifically bind to human BTLA, can be used to increase, enhance, stimulate, or up-regulate an immune response related to BTLA activity.
- antibodies of the present invention that do not block binding of BTLA to HVEM e.g. agonist antibodies Hu Mab8D5, huMab8A3 are used therapeutically to stabilize BTLA in subjects in need of prolonged BTLA activity.
- Anti-BTLA agonist antibodies e.g., Hu Mab8D5, huMab8A3, hu Mab21H6, and hu Mabl9A7 activate inhibitory receptor function of BTLA.
- Subjects who would benefit from such treatment include patients suffering from an inflammatory or autoimmune disorder, such as inflammatory bowel disorders (e.g., Crohn's disease, ulcerative colitis, and inflammatory bowel disease), inflammatory fibrosis (e.g., scleroderma, lung fibrosis, and cirrhosis), rheumatoid arthritis (RA), osteoarthritis, osteoporosis, asthma (including allergic asthma), allergies, chronic obstructive pulmonary disease (COPD), multiple sclerosis, psoriasis, uveitis, graft versus host disease (GVHD), juvenile early-onset Type I diabetes, transplant rejection, SLE, and Sjogren's syndrome.
- Such methods of treatment may further comprise administering one or more additional therapeutic agents, such as immunosuppressive or anti-inflammatory agents.
- RA is a progressive, systemic disease characterized by inflammation of the synovial joints affecting about 0.5% of the world's population. See, Emery (2006) BMJ 332: 152-155. Joint inflammation can lead to deformity, pain, stiffness and swelling, and ultimately to irreversible deterioration of the joint. Affected joints include knees, elbows, neck and joints of the hands and feet.
- Conventional treatment involves use of NSAIDs to alleviate symptoms, followed by administration of disease modifying antirheumatic drugs (DMARDs) such as gold, penicillamine, sulfasalazine and methotrexate.
- DMARDs disease modifying antirheumatic drugs
- TNF- ⁇ inhibitors including monoclonal antibodies, such as infliximab, adalimumab and golimumab, and receptor fusion proteins, such as etanercept. Treatment with these TNF- ⁇ inhibitors dramatically reduces structural damage from the disease.
- the anti-BTLA agonist antibodies of the present invention may be used to treat
- the anti-BTLA antibodies of the present invention may also be combined with other treatments for RA, e.g. methotrexate, azathioprine, cyclophosphamide, steroids, mycophenolate mofetil, NSAIDs, or TNF- ⁇ inhibitors (antibodies or receptor fragments).
- treatments for RA e.g. methotrexate, azathioprine, cyclophosphamide, steroids, mycophenolate mofetil, NSAIDs, or TNF- ⁇ inhibitors (antibodies or receptor fragments).
- the anti-BTLA antibodies of the present invention are used to treat human subjects who have not previously responded adequately to treatment with
- DMARDs alone.
- treatment with the anti-BTLA antibodies of the present invention is begun early in the course of disease, without requiring prior failure of
- DMARD therapy Such early intervention may be appropriate, for example, once the safety of the antibody therapy has been firmly established.
- Clinical improvement is measured by determining the ACR score, as described in more detail in Example 18.
- ACR scores of 20, 50, and 70 are the desired endpoint, and these endpoints may be assessed at any appropriate point in the course of treatment, such as 5, 10, 15, 24, 40, 50 or more weeks.
- IBD Inflammatory Bowel Disease
- IBD is the name for a group of disorders (e.g. Crohn's disease and ulcerative colitis) in which the intestines become inflamed, resulting in abdominal cramps and pain, diarrhea, weight loss and intestinal bleeding. IBD affects over 600,000 Americans.
- disorders e.g. Crohn's disease and ulcerative colitis
- Conventional treatment options include sulfasalazine, corticosteroids (e.g. prednisone), immune system suppressors such as azathioprine and mercaptopurine, or an antibiotic (e.g. metronidazole) for Crohn's disease.
- Therapeutic monoclonal antibody treatments include etanercept, natalizumab and infliximab.
- the anti-BTLA agonist antibodies of the present invention may be used to treat
- anti-BTLA agonist antibodies of the present invention may also be combined with other treatments for IBD, e.g. IL-10 (see U.S. Pat. Nos.
- the skin serves as an important boundary between the internal milieu and the environment, preventing contact with potentially harmful antigens. In the case of antigen/pathogen penetration, an inflammatory response is induced to eliminate the antigen.
- This response leads to a dermal infiltrate that consists predominantly of T cells, polymorphonuclear cells, and macrophages (see, e.g., Williams and Kupper (1996) Life ScL,
- this inflammatory response occurs without external stimuli and without proper controls, leading to cutaneous inflammation.
- the present invention provides methods for treating and diagnosing cutaneous inflammation. Cutaneous inflammation, the result of the cellular infiltrate noted above as well as the secreted cytokines from these cells, encompasses several inflammatory disorders such as cicatricial pemphigoid, scleroderma, hidradenitis suppurativa, toxic epidermal necrolysis, acne, osteitis, graft vs. host disease
- Psoriasis is characterized by T cell mediated hyperproliferation of keratinocytes coupled with an inflammatory infiltrate.
- the disease has certain distinct overlapping clinical phenotypes including chronic plaque lesions, skin eruptions, and pustular lesions (see, e.g.,
- the typical psoriatic lesion is a well defined erythematous plaque covered by thick, silvery scales.
- the inflammation and hyperproliferation of psoriatic tissue is associated with a different histological, antigenic, and cytokine profile than normal skin.
- cytokines associated with psoriasis are: TNF ⁇ , IL- 19, IL- 18, IL- 15, IL- 12, IL-7, IFN ⁇ , IL- 17A and IL-23 (see Gudjonsson et al, supra).
- Anti-BTLA antibodies of the present invention may also be used in prevention, treatment, diagnosis and prediction of psoriasis flare-ups.
- SLE Systemic Lupus Erythematosis
- Lupus erythematosus is a connective tissue disease.
- Lupus is a chronic inflammatory disease that occurs when the body's immune system attacks its own tissues and organs. Inflammation caused by lupus can affect many different body systems, including joints, skin, kidneys, blood cells, heart, and lungs. Lupus occurs more frequently in women than men, although the reasons for this are unknown.
- anti-BTLA agonist antibodies of the present invention may be used to treat lupus in subjects in need of such treatment.
- the anti-BTLA antibodies may be combined with other treatments for lupus including NSAID' s, certain anti-malaria drugs ⁇ e.g., hydroxychloroquine and corticosteroids, immunosuppressive drugs ⁇ e.g., cyclophosphamide (Cytoxan) and azathioprine (Imuran), and mycophenolate mofetil (CellCept)), Rituximab, and Dehydroepiandrosterone (DHEA).
- Sjogren's syndrome is another chronic disorder that causes dry eyes and a dry mouth.
- anti-BTLA antibodies of the present invention may be useful for treating individuals with Sjogren's syndrome.
- the anti-BTLA antibodies of the present invention may also be combined with other treatments for Sjogren's syndrome, along the lines described for Lupus.
- MS Multiple Sclerosis
- MS is thought to be an autoimmune disease of the central nervous system
- CNS cytoplasmic styrene-associated styrene-associated styrene-associated styrene-associated styrene-associated styrene-associated styrene-associated styrene-associated styrene-associated styrene-associated styrene-associated styrene-associated styrene-associated s, followed by periods of partial or complete remission.
- Conventional treatment options include interferon- ⁇ - Ia and -Ib, mitoxantrone, the tetrapeptide glatiramer acetate, therapeutic alpha-4- integrin-specific antibodies (natalizumab), or small molecule antagonists of alpha-4-integrin ⁇ e.g. those disclosed at WO2003/084984).
- anti-BTLA agonist antibodies of the present invention may be used to treat MS in subjects in need of such treatment.
- the anti-BTLA antibodies may also be combined with other treatments for MS, e.g. interferon- ⁇ , interferon- ⁇ , steroids or alpha-4-integrin-specific antibodies.
- Antagonist antibody or antigen binding fragments of the invention can be used to treat cancer ⁇ i.e., to inhibit the growth or survival of tumor cells).
- Preferred cancers whose growth may be inhibited using the antagonist antibodies of the invention include cancers typically responsive to immunotherapy, but also cancers that have not hitherto been associated with immunotherapy.
- Non-limiting examples of preferred cancers for treatment include melanoma ⁇ e.g., metastatic malignant melanoma), renal cancer (e.g. clear cell carcinoma), prostate cancer (e.g. hormone refractory prostate adenocarcinoma), pancreatic adenocarcinoma, breast cancer, colon cancer, lung cancer ⁇ e.g.
- non-small cell lung cancer non-small cell lung cancer
- esophageal cancer squamous cell carcinoma of the head and neck
- liver cancer ovarian cancer
- cervical cancer thyroid cancer
- glioblastoma glioma
- leukemia lymphoma
- other neoplastic malignancies include refractory or recurrent malignancies whose growth may be inhibited using the antibodies of the invention.
- Antagonist antibody or antibody fragments of the invention can be used alone or in combination with: other anti-neoplastic agents or immunogenic agents (for example, attenuated cancerous cells, tumor antigens (including recombinant proteins, peptides, and carbohydrate molecules), antigen presenting cells such as dendritic cells pulsed with tumor derived antigen or nucleic acids, immune stimulating cytokines (for example, IL-2, IFNa2, GM-CSF), and cells transfected with genes encoding immune stimulating cytokines such as but not limited to GM-CSF); standard cancer treatments (for example, chemotherapy, radiotherapy or surgery); or other antibodies (including but not limited to antibodies to VEGF, EGFR, Her2/neu, VEGF receptors, other growth factor receptors, CD20, CD40, CTLA-4, OX- 40, 4- IBB, PD-I, PD-Ll, CTLA-4, ICOS, and other molecules in negative regulatory pathways).
- other anti-neoplastic agents or immunogenic agents
- Antagonist antibody or antigen binding fragments of the invention can also be used to prevent or treat infections and infectious disease.
- the antibody or antibody fragments can be used alone, or in combination with vaccines, to stimulate the immune response to pathogens, toxins, and self-antigens.
- the antibodies or antigen-binding fragment thereof can be used to stimulate immune response to viruses infectious to humans, such as, but not limited to, human immunodeficiency viruses, hepatitis viruses class A, B and C, Eppstein Barr virus, human cytomegalovirus, human papilloma viruses, herpes viruses.
- the antibodies or antigen-binding fragment thereof can be used to stimulate immune response to infection with bacterial or fungal parasites, and other pathogens.
- Antagonist antibody or antigen binding fragments of the invention can be used in conjunction with other recombinant proteins and/or peptides (such as tumor antigens or cancer cells) in order to increase an immune response to these proteins ⁇ i.e., in a vaccination protocol).
- anti-BTLA antagonist antibodies and antibody fragments thereof may be used to stimulate antigen-specific immune responses by coadministration of an anti-BTLA antibody with an antigen of interest (e.g., a vaccine).
- an antigen of interest e.g., a vaccine
- the invention provides a method of enhancing an immune response to an antigen in a subject, comprising administering to the subject: (i) the antigen; and (ii) an anti-BTLA antibody of the invention or antigen-binding fragment thereof, such that an immune response to the antigen in the subject is enhanced.
- the antigen can be, for example, a tumor antigen, a viral antigen, a bacterial antigen or an antigen from a pathogen.
- Non-limiting examples of such antigens include, without limitation, tumor antigens, or antigens from the viruses, bacteria or other pathogens.
- anti-BTLA antagonist antibodies and antibody fragments of the invention can also be used to treat Th2 mediated diseases, such as asthma and allergy. This is based on the finding that the antibodies of the invention can help induce a ThI response. Thus, the antibodies of the invention can be used to in Th2 mediated diseases to generate a more balanced immune response.
- the antibodies and antigen fragments of the invention are antibodies and antigen fragments of the invention.
- hu Mab4C7 can also be used for the ex vivo activation and expansion of antigen specific T cells and adoptive transfer of these cells into recipients in order to increase antigen-specific T cells against tumor. These methods may also be used to activate T cell responses to infectious agents such as CMV. Ex vivo activation in the presence of anti-BTLA antibodies may be expected to increase the frequency and activity of the adoptively transferred
- anti-BTLA antibodies of the invention can be coadministered with one or other more therapeutic agents, e.g., a cytotoxic agent, a radiotoxic agent, or an immunosuppressive agent.
- the antibody can be linked to the agent (as an immunocomplex) or can be administered separately from the agent. In the latter case (separate administration), the antibody can be administered before, after or concurrently with the agent or can be co-administered with other known therapies.
- Antibodies and antigen binding fragments of the invention can also be used to increase the effectiveness of donor engrafted tumor specific T cells.
- Monoclonal, polyclonal, and humanized antibodies can be prepared (see, e.g.,
- An alternative to humanization is to use human antibody libraries displayed on phage or human antibody libraries in transgenic mice (Vaughan et al. (1996) Nature Biotechnol. 14:309-314; Barbas (1995) Nature Medicine 1:837-839; Mendez et al (1997) Nature Genetics 15:146-156; Hoogenboom and Chames (2000) Immunol. Today 21:371-377; Barbas et al. (2001) Phage Display: A Laboratory Manual, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, New York; Kay et al. (1996) Phage Display of Peptides and Proteins: A Laboratory Manual, Academic Press, San Diego, CA; de Bruin et al. (1999) Nature Biotechnol. 17:397-399).
- Bispecific antibodies are also provided (see, e.g., Azzoni et al (1998) J.
- Animals can be immunized with cells bearing the antigen of interest. Splenocytes can then be isolated from the immunized animals, and the splenocytes can fused with a myeloma cell line to produce a hybridoma (see, e.g., Meyaard et al (1997) Immunity 7:283-290; Wright et al (2000) Immunity 13:233-242; Preston et al, supra; Kaithamana et al (1999) J. Immunol 163:5157-5164).
- Antibodies can be conjugated, e.g., to small drug molecules, enzymes, liposomes, polyethylene glycol (PEG). Antibodies are useful for therapeutic, diagnostic, kit or other purposes, and include antibodies coupled, e.g., to dyes, radioisotopes, enzymes, or metals, e.g., colloidal gold (see, e.g., Le Doussal et al (1991) J. Immunol. 146:169-175; Gibellini et al (1998) J. Immunol. 160:3891-3898; Hsing and Bishop (1999) J. Immunol. 162:2804-2811; Everts et al (2002) J. Immunol. 168:883-889). [00385] Methods for flow cytometry, including fluorescence activated cell sorting
- FACS Fluorescence Activated Cell Sorting
- Fluorescent reagents suitable for modifying nucleic acids including nucleic acid primers and probes, polypeptides, and antibodies, for use, e.g., as diagnostic reagents, are available (Molecular Probes (2003) Catalogue, Molecular Probes, Inc., Eugene, OR; Sigma-Aldrich (2003) Catalogue, St. Louis, MO).
- Fully human monoclonal antibodies specific for human BTLA were generated using Medarex, Inc.'s LUtiMAb antibody generation platform by immunizing mice with a combination of CHO cells overexpressing membrane-bound huBTLA and huBTLA-Fc fusion protein in MPL + TDM adjuvant. Mice were immunized with BTLA-Fc fusion protein or cells expressing membrane-bound BTLA expressing mature extracellular domain (residues 31- 152 of SEQ ID NO: 35). This sequence corresponds with the extracellular domain of transcript 1 variant described at GenBank Accession No.
- NP_861445 sequence that matches human BTLA transcript 1 variant (NP_861445), with one amino acid difference in the intracellular domain at position 267 ((Pro267Leu, SEQ ID NO:35, encoded by SEQ ID NO:36) relative to NP_861445 (SEQ ID NO:37).
- selected mice were chosen for fusion.
- One fusion produced 49 anti-BTLA Mabs most of which were of the IgG4 isotype.
- Another fusion produced 154 MAbs most of which were of the IgGl isotype, including the Mab8D5.
- anti-BTLA Mabs were initially characterized and selected based on binding to BTLA-Ig by ELISA, FACS/FMAT screening on CHO/huBTLA and CHO parental cells to eliminate CHO positive Mabs, and for their ability to block HVEM binding to BTLA CHO cells. Relative affinity determinations were made using BIACore surface plasmon resonance analysis.
- the hu Mab8D5 binds equally well to both human and cynomolgus BTLA, but has no blocking activity.
- Hu Mab8D5 also demonstrated agonist activity in B- and T-cell functional assays as described herein.
- Hu Mab8D5 is a fully human monoclonal antibody of the IgG4/kappa isotype
- the Hu Mab8D5 antibody is non-blocking and does not interfere with HVEM binding.
- Three additional antibodies, hu Mab8A3, hu Mab21H6, hu Mabl9A7 exhibit similar, but not identical functional properties to those of hu Mab8D5. While hu Mab8A3 is also a non-blocking agonist antibody that does not interfere with HVEM binding, hu Mab21H6 and hu Mabl9A7 are agonists that also block binding of HVEM with BTLA.
- Antibodies of the IgG4 isotype poorly bind complement CIq and therefore do not significantly activate complement.
- IgG4 antibodies also bind weakly to Fc ⁇ receptors, leading to inefficient or absent antibody-dependent cell-mediated cytotoxicity (ADCC) (reviewed in Presta, 2002).
- ADCC antibody-dependent cell-mediated cytotoxicity
- the initially selected 8D5 IgGl Mab was re-expressed as a human IgG4 containing the stabilizing Adair S228P mutation, to produce an anti-BTLA antibody that lacks effector function.
- variable regions were subcloned into Ubiquitous Chromatin Opening Element (UCOE; Millipore, Billerica, MA) vectors, which contain the human kappa constant region and the human gamma 4 constant region with the S228P hinge mutation (Angal, 1993).
- Heavy and light chain expression vectors were linearized and cotransfected into CHO-S cells (Invitrogen, Carlsbad, CA) and stable clones were selected in CD CHO medium (Invitrogen, Carlsbad, CA) containing G418 and puromycin. Clones were screened for expression using a human gamma/kappa sandwich ELISA, and the best producing line was scaled up to 2L for production and purification.
- the IgG4 version of the original 8D5 Mab is referred to herein as hu Mab8D5 (or hu Mab8D5 G4).
- the IgGl version of 8D5 is referred to herein as hu Mab8D5 Gl.
- RNA sequence of heavy and light chain variable regions of the hu Mab8D5 and hu Mab4C7 sequences were determined.
- Total RNA was prepared from 5 x 10 6 hybridoma cells using the RNeasy Mini Kit according to manufacturer's instructions (Qiagen, Valencia, CA, USA).
- cDNA was prepared by the 5'- RACE protocol with the SMART RACE cDNA Amplification Kit (Clontech Laboratories, Inc., Mountain View, CA, USA) and Superscript II Reverse Transcriptase (Invitrogen, Carlsbad, CA, USA), both according to manufacturer's instructions.
- VH primer HLB02 SEQ ID NO:33
- VK primer LY49 SEQ ID NO:34
- PCR products containing the V-region were cloned into the pCR4-TOPO vector (Invitrogen, Carlsbad, CA, USA) and transformed into E. coli strain TOPlO (Invitrogen, Carlsbad, CA, USA).
- Either miniprep DNA or Templiphi were prepared, and subjected to DNA sequencing (Sequetech, Mountain View, CA, USA).
- hu Mab8D5 was titrated 3 -fold from 20 ⁇ g/ml on CHO cells expressing human BTLA or 2-fold from 50 ⁇ g/ml on CHO cells expressing cynomolgus BTLA in 4 0 C buffer containing 0.02% sodium azide to prevent receptor internalization. PE-anti-huFc was used for detection. This data illustrates that hu Mab8D5 binds to human and cynomolgus BTLA. Agonists huMab8A3, hu Mab21H6, and hu Mabl9A7 exhibit similar binding affinities to that of hu Mab8D5.
- hu Mab4C7 was titrated 3-fold from 20 ⁇ g/ml on CHO cells expressing human BTLA or 2-fold from 50 ⁇ g/ml on CHO cells expressing cynomolgus BTLA in 4 0 C buffer containing 0.02% sodium azide to prevent receptor internalization.. PE-anti-huFc was used for detection.
- half-maximal binding of human and cynomolgus BTLA occurred at -1.6 nM for both the IgGl and IgG4 versions of hu Mab4C7, as shown in Figures 3C-D. This data illustrates that hu Mab4C7 binds to human and cynomolgus BTLA.
- the antibodies were further profiled in order to elucidate binding kinetics and calculate equilibrium binding constants using BIAcore analysis demonstrating fast-on slow-off kinetics.
- BIAcore the test antibodies were captured on an anti-CHI chip.
- Hu Mab8D5 G4 exhibited an apparent Kd of 2.4 nM.
- the antagonist antibody hu Mab4C7 exhibited an apparent Kd of 4.6 nM.
- HVEM to human BTLA The ability to block the binding of HVEM to human BTLA was measured using a competitive cell-based flow cytometry assay.
- Serially diluted hu Mab8D5 was applied for 15 minutes to CHO cells expressing human BTLA (in buffer containing 0.02% sodium azide to prevent receptor internalization) prior to the addition of biotinylated human HVEM-Fc (R&D Systems; 1 ⁇ g/mL) for 30 minutes at 4 0 C.
- hu Mab8D5 was titrated 3 fold starting from 50 ⁇ g/ml and PE-SA was used for detection.
- HVEM blocking ability of hu Mab4C7 is shown in Figure 4A from the same assay.
- Serially diluted hu Mab4C7 was applied for 15 minutes to CHO cells expressing human BTLA (in buffer containing 0.02% sodium azide to prevent receptor internalization) prior to the addition of biotinylated human HVEM-Fc (R&D Systems; 1 ⁇ g/mL) for 30 minutes at 4 0 C.
- hu Mab4C7 was titrated 3 fold starting from 50 ⁇ g/ml and PE-SA was used for detection.
- Washed cells were resuspended in 4 0 C buffer containing propidium iodide (PI) as well as 0.02% sodium azide to prevent receptor internalization and analyzed by flow cytometry. Live cells were gated based on exclusion of Pi-positive cells from the FSC/SSC gate and their geometric mean fluorescence was measured.
- the results in Figure 4A show hu Mab4C7 blocks human HVEM (hHVEM) binding to CHO cells expressing hBTLA.
- HVEM to human BTLA Similar results were obtained for antibody huMab8A3. As shown in Figure 4A, huMAb4C7 inhibits or competes with binding of HVEM to human BTLA. Similar blocking results were obtained for antibodies hu Mab21H6, hu Mabl9A7.
- Anti-BTLA agonist antibodies and antibody fragments were tested for their capacity to decrease T cell activity in vitro using blood cells from healthy volunteers stimulated in various settings.
- a classical T cell stimulation assay was utilized that employs anti-CD3 Mab to cross-link the T cell receptor complex on the cell surface of all competent human T cells.
- T cell blasts were generated in culture from human PBMCs using PHA and IL-
- Blasts were stimulated with immobilized anti-CD3 Abs for 48 hours in the presence or absence of soluble hu Mab8D5, hu Mab8D5 Fab fragment or IgGl isotype control. Proliferation was measured by thymidine incorporation as shown in Figure 5.
- hu Mab8D5 was demonstrated to inhibit proliferation suggesting that the outcome of concurrent stimulation of the antigen receptor and BTLA on T cells is suppression of T cell response (Fig. 5).
- the hu Mab8D5 antibody added to these cultures as monovalent Fab' fragments demonstrated similar activity, which strongly indicates that hu Mab8D5 activates BTLA receptor function by hitting a functional epitope, and not by cross- linking of multiple BTLA molecules on the cell surface.
- This data illustrates that hu Mab8D5 inhibits anti-CD3 induced proliferation of human T cell blasts.
- BTLA receptor employs Staphylococcus enterotoxin B (SEB) to engage and activate all human T cells expressing the V ⁇ 3, V ⁇ l2, V ⁇ l4, V ⁇ l7 and some other T cell receptor chains, depending on the dose of SEB. Depending on the donor, SEB activates up to 20% of all T cells determined by IL-2 production.
- SEB Staphylococcus enterotoxin B
- Fig. 6A healthy human
- Fig. 6B cynomolgus monkey donor blood
- Fig. 6B cynomolgus monkey donor blood
- SEB superantigen SEB
- CTLA-4/Ig The soluble CTLA-4-Ig fusion protein (CTLA-4/Ig), which blocks the interaction between the costimulatory receptor CD28 and its ligands CD80/CD86, decreased the SEB-induced IL-2 production, further validating the SEB stimulation assay as a method to quantify T cell activity after manipulation of costimulatory pathways.
- the decrease in IL-2 production by the tested agonist anti-BTLA antibodies was found to be dose-dependent ( Figures 6A-B).
- Antibodies hu Mab8A3, hu Mab21H6, hu Mabl9A7 may also have similar effects on IL-2 production.
- Hu MAb4C7 in contrast to CTLA-4/Ig and hu Mab8D5, increased IL-2 production compared to control human IgG4 in both human (Fig. 6C) and monkey donors (Fig. 6D.
- BTLA is especially useful in testing for the ability of the Mabs to modulate T cell responses in well-tested models such as monkey kidney transplant and EAE systems, which are indicative of disease modulation in vivo.
- the ability of the tested agonist anti-BTLA antibodies to decrease IL-2 production in the SEB stimulation assay indicates that these antibodies would be suitable for controlling or preventing conditions such as graft versus host disease.
- TT Tetanus Toxoid
- IFN ⁇ Interferon gamma
- TT-induced IFN ⁇ production ( Figures 7A) and proliferation ( Figures 7B) were markedly reduced by CTLA-4/Ig and by hu Mab8D5 compared to antigen alone. These data indicate that hu Mab8D5 is capable of inhibiting T cell responses triggered through the (antigen-specific) T cell receptor complex. Both primary and secondary (recall) responses are suppressed in the presence of hu Mab8D5.
- TT Tetanus Toxoid
- IgM in the presence or absence of anti-BTLA Mabs were isolated by negative selection from human whole blood and stimulated with 10 ⁇ g/ml of anti-IgM F(ab') 2 fragments in the presence or absence of hu Mab8D5, CTLA-4/Ig or isotype control. Proliferation was measured by thymidine incorporation after 48h. Hu Mab8D5 produced a dose-dependent decrease in B cell proliferation, while an isotype control and CTLA-4/Ig had no effect, as shown in Fig. 9. Similar results were obtained for antibody huMab8A3.
- FIG. 10A-B represent graphs showing the inhibition of peripheral blood B cell chemokine production by hu Mab8D5.
- B cells were isolated by negative selection from human whole blood and stimulated with 10 ⁇ g/ml of anti- IgM F(ab') 2 fragments in the presence or absence of hu Mab8D5 or isotype control.
- MIPl ⁇ and ⁇ production were measured by ELISA.
- hu Mab8D5 reduced chemokine production of MIPIa (Fig. 10A) and MIPl ⁇ (Fig. 10B) of anti-IgM triggered B cells in a dose- dependent fashion.
- hu Mab8D5 and control antibodies were tested in experiments using non-antigen-specific triggers, such as CD40L plus IL-4, which potently induce B cell proliferation without engaging the B cell receptor. Under these conditions, no activity of hu Mab8D5 was detected.
- Hu Mab8D5 does not autonomously elicit immune activity
- FIG 11 is a graph showing that hu Mab8D5 does not autonomously stimulate immune activity in healthy donor blood. Diluted whole blood from humans was stimulated with the superantigen SEB in the presence or absence of hu Mab8D5 or CTLA-4-Ig. HuIgG4 is the isotype control mAb for hu Mab8D5. Hu Mab8D5 was also added to blood in the absence of SEB stimulation. After 48 hours (h), IL-2 production was measured by ELISA.
- hu Mab8D5 does not stimulate detectable proliferation or cytokine responses without concurrent specific stimulation of the T cell receptor. This demonstrates that hu Mab8D5 is not likely to induce inadvertent cytokine storm-like events in patients.
- Hu Mab8D5 triggers BTLA inhibitory signaling activity
- Hu Mab8D5 and hu Mab4C7 immuno-precipitates BTLA protein from B cells, and pretreatment with hu Mab8D5 reduces TCR ⁇ phosphorylation. Lysates from human peripheral blood B cells were immuno-precipitated with various BTLA HuMAbs.
- huIgG4 is an isotype control
- hu Mab4C7 an antagonist antibody
- 2G9 are other BTLA HuMAbs.
- Mab4C7 were shown to specifically bind to and immunoprecipitate BTLA (Fig. 12A).
- Fig. 12A peripheral blood CD4+ T cells stimulated with anti-CD3 plus anti-CD28, pre-incubation with hu Mab8D5 was found to reduce phosphorylation of the TCR ⁇ chain, which is critical for initiation of TCR/CD3 signaling (Fig. 12B).
- Hu Mab8D5 is active as a monovalent Fab'
- Fig. 13 A diluted whole blood from humans was stimulated with the superantigen SEB in the presence or absence of hu Mab8D5 Fab or isotype control Fab for hu Mab8D5. After 48h, IL-2 production was measured by ELISA.
- Fig. 13B B cells were isolated by negative selection from human whole blood and stimulated with 10 ⁇ g/ml of anti- IgM F(ab') 2 fragments in the presence or absence of hu Mab8D5 Fab or isotype control Fab. Proliferation was measured by thymidine incorporation after 48h.
- Figures 13A-B illustrate that hu Mab8D5 suppressed SEB response and B cell proliferation in a dose dependent manner.
- the hu Mab8D5 was found to trigger BTLA activity when added to T or B cell cultures as a monovalent Fab' .
- the relative potency (but not the relative efficacy) of the Fab' was approximately 10-fold less than that of the full Mab which suggests that loss of potency was merely due to loss of avidity.
- Hu Mab8D5 as a Fab' fragment was able to dose-dependently suppress both an SEB response in human whole blood and anti-IgM- induced B cell proliferation ( Figures 13A-B).
- BTLA immune suppressive activity could also be triggered when any BTLA binding antibody was coated onto plastic (through cross-linking of multiple receptors).
- hu Mab8D5 does not impede binding of HVEM, the natural ligand of BTLA, while not wishing to be bound by theory, this indicates that hu Mab8D5 hits an (potentially allosteric) epitope on the extracellular domain of BTLA inducing a conformational change and subsequent intracellular signaling.
- BTLA is an immunomodulatory receptor of the CD28 family.
- a potential complication of utilizing an agonist antibody is induction of "cytokine storm" activity in vivo.
- Cytokine storm is a systemic inflammatory response characterized by a rapid induction of proinflammatory cytokines due to an interruption of the positive feedback loop between cytokines and immune cells.
- Procedures to improve predictive preclinical safety testing of immunomodulatory therapeutics have been developed (e.g., by the National Institute for Biological Standards and Control, UK, See, Stebbings, 2007).
- In vitro testing of hu Mab8D5 utilizing current models and methodology to predict the potential for cytokine storm in vivo has been performed.
- cytokine storm assays were conducted using purified positive cytokine storm control agonist antibody as the positive reference.
- immobilized positive control agonist mAb produced a robust IL-2 response in the absence of additional stimulation.
- immobilized in the same manner neither hu Mab8D5 nor control IgG4 induced IL-2 secretion, as shown in Figures 14A-B.
- Figures 14B-D illustrate that agonist antibodies hu Mab8D5, hu Mab8A3, hu Mabl5C5, hu Mab20H4, and hu Mabl9A7 also did not elicit production of the inflammatory cytokines interferon gamma (IFN ⁇ ) and tumor necrosis factor alpha (TNF ⁇ ) when supercrosslinked (under conditions as described above).
- the positive control agonist mAb in contrast, produced both an DRN ⁇ and TNF ⁇ response.
- hu Mab8D5 does not autonomously stimulate immune function in any of the functional assays employed. Addition of hu Mab8D5 in the absence of T cell specific triggering does not result in measurable changes in cytokine secretion or proliferation. Furthermore, in tests forcing higher level cross- linking by coating hu Mab8D5 onto plastic, the mAb did not induce cytokine release or proliferation. Based on these data, the inhibitory nature of the BTLA-HVEM interaction, and the fact that triggering BTLA incurs inhibitory intracellular signaling, the potential risk of a cytokine storm is considered highly unlikely.
- SCID mice were engrafted i.p. with human spleen cells, immunized with 100 ⁇ g tetanus toxoid and treated with 200 ⁇ g target specific or control antibodies on days 0, 5, 9 and 14. Mice were boosted with TT on day 7. On Day 28 the mice were euthanized, sera were collected and peritoneal exudate cells (PEC) were harvested. PEC were analyzed by FACS for lymphocyte subset marker expression to evaluate Ab treatment effects on relative cell numbers. TT-specific and total human IgG concentrations in day 28 sera were quantified by ELISA.
- the SCID-RA synovium model involves transplantation of synovium from RA- patients to immune-deficient SCID mice to create a humanized mouse model for RA.
- RA synovial grafts can persist in SCID mice and maintain the morphology and characteristics of the RA joint, including synovial hyperplasia, inflammation, immune reactivity and angiogenesis.
- RA synovium are obtained from joint replacement surgery (e.g. hip, knee, shoulder).
- the SCID immuno-deficient mice have no functional T and B cells and exhibit no graft rejection.
- Attenuating lymphocyte activity the crystal structure of the BTLA-HVEM complex. J Biol
- HVEM-L Herpesvirus entry mediator ligand
- BTLA is a lymphocyte inhibitory receptor with similarities to CTLA-4 and PD-I. Nat Immunol 2003;
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EA201270228A EA201270228A1 (en) | 2009-07-31 | 2010-07-26 | FULLY HUMAN ANTIBODIES TO BTLA |
BR112012007875A BR112012007875A2 (en) | 2009-07-31 | 2010-07-26 | fully human antibodies to btla |
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CA2769473A CA2769473A1 (en) | 2009-07-31 | 2010-07-26 | Fully human antibodies to btla |
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US8563694B2 (en) | 2013-10-22 |
US20160222114A1 (en) | 2016-08-04 |
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