Abstract
DNAM-1 (CD226) is an activating immunoreceptor expressed on lymphocytes and myeloid cells. CD155 and CD112 are the ligands for DNAM-1. DNAM-1 plays an important role in tumor immunity mediated by CD8+ T cells and NK cells. Moreover, the interaction of DNAM-1 with the ligands contributed to the development of acute graft versus host disease (GVHD) and treatment with anti-DNAM-1 monoclonal antibodies (mAb) dramatically improved acute GVHD in a mouse model, suggesting that DNAM-1 may be a good molecular target for therapy to acute GVHD in human. In this study, we generated and characterized five novel clones of anti-human DNAM-1 mAbs, named TX94, TX95, TX96, TX107, and TX108. Among these mAbs, TX94 is a unique neutralizing mAb that most efficiently blocked the interaction between DNAM-1 and CD155. Furthermore, TX94 inhibited NK cell-mediated cytotoxicity against a tumor cell line and suppressed CD8+ T cell proliferation mediated by allogeneic mixed lymphocyte reaction. Thus, TX94 may be useful for molecular therapy targeting DNAM-1.
Keywords:
CD8+ T cells; DNAM-1; NK cells; blocking antibodies.
MeSH terms
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Animals
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Antibodies, Monoclonal / biosynthesis*
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Antibodies, Monoclonal / chemistry
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Antibodies, Monoclonal / pharmacology
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Antibodies, Neutralizing / biosynthesis*
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Antibodies, Neutralizing / chemistry
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Antibodies, Neutralizing / pharmacology
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Antibody Specificity
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Antigens, Differentiation, T-Lymphocyte / chemistry
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Antigens, Differentiation, T-Lymphocyte / genetics
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Antigens, Differentiation, T-Lymphocyte / immunology*
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CD8-Positive T-Lymphocytes / cytology
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CD8-Positive T-Lymphocytes / drug effects*
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CD8-Positive T-Lymphocytes / immunology
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Cell Proliferation
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Cells, Cultured
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Cytotoxicity, Immunologic / drug effects
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Gene Expression
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Humans
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Immunoglobulin Fc Fragments / chemistry
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Immunoglobulin Fc Fragments / genetics
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Killer Cells, Natural / cytology
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Killer Cells, Natural / drug effects
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Killer Cells, Natural / immunology
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Lymphocyte Culture Test, Mixed
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Mice
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Mice, Inbred BALB C
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Mice, Nude
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Protein Binding
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Receptors, Virus / antagonists & inhibitors
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Receptors, Virus / chemistry
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Receptors, Virus / genetics
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Receptors, Virus / immunology*
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Recombinant Fusion Proteins / biosynthesis*
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Recombinant Fusion Proteins / chemistry
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Recombinant Fusion Proteins / pharmacology
Substances
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Antibodies, Monoclonal
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Antibodies, Neutralizing
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Antigens, Differentiation, T-Lymphocyte
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CD226 antigen
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Immunoglobulin Fc Fragments
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Receptors, Virus
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Recombinant Fusion Proteins
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poliovirus receptor