title: The role of SAP in murine CD150 (SLAM)-mediated T-cell proliferation and interferon gamma production.
abstract: CD150 (signaling lymphocyte activation molecule [SLAM]) is a self-ligand cell surface glycoprotein expressed on T cells, B cells, macrophages, and dendritic cells. To further explore the role of CD150 signaling in costimulation and T(H)1 priming we have generated a panel of rat antimouse CD150 monoclonal antibodies. CD150 cell surface expression is up-regulated with rapid kinetics in activated T cells and lipopolysaccharide/interferon gamma (IFN-gamma)-activated macrophages. Anti-CD150 triggering induces strong costimulation of T cells triggered through CD3. DNA synthesis of murine T cells induced by anti-CD150 is not dependent on SLAM-associated protein (SAP, SH2D1A), because anti-CD150 induces similar levels of DNA synthesis in SAP(-/-) T cells. Antibodies to CD150 also enhance IFN-gamma production both in wild-type and SAP(-/-) T cells during primary stimulation. The level of IFN-gamma production is higher in SAP(-/-) T cells than in wild-type T cells. Anti-CD150 antibodies also synergize with interleukin 12 (IL-12) treatment in up-regulation of IL-12 receptor beta(2) mRNA during T(H)1 priming, and inhibit primary T(H)2 polarization in an IFN-gamma-dependent fashion. Cross-linking CD150 on CD4 T cells induces rapid serine phosphorylation of Akt/PKB. We speculate that this is an important pathway contributing to CD150-mediated T-cell proliferation.
mesh_terms: D000818:Animals; D015703:Antigens, CD; D001483:Base Sequence; D016466:CHO Cells; D002352:Carrier Proteins / Q000235:genetics / Q000276:immunology*; D006224:Cricetinae; D016207:Cytokines / Q000096:biosynthesis; D017931:DNA Primers; D004797:Enzyme-Linked Immunosorbent Assay; D006023:Glycoproteins / Q000235:genetics / Q000276:immunology*; D007136:Immunoglobulins / Q000235:genetics / Q000276:immunology*; D007371:Interferon-gamma / Q000096:biosynthesis*; D047908:Intracellular Signaling Peptides and Proteins; D008213:Lymphocyte Activation / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D016133:Polymerase Chain Reaction; D011956:Receptors, Cell Surface; D011994:Recombinant Proteins / Q000276:immunology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction / Q000276:immunology; D000071179:Signaling Lymphocytic Activation Molecule Associated Protein; D000071177:Signaling Lymphocytic Activation Molecule Family Member 1; D013601:T-Lymphocytes / Q000276:immunology*; D018417:Th1 Cells / Q000276:immunology; D014162:Transfection
chemical_list: D015703:Antigens, CD; D002352:Carrier Proteins; D016207:Cytokines; D017931:DNA Primers; D006023:Glycoproteins; D007136:Immunoglobulins; D047908:Intracellular Signaling Peptides and Proteins; D011956:Receptors, Cell Surface; D011994:Recombinant Proteins; C499569:Sh2d1a protein, mouse; D000071179:Signaling Lymphocytic Activation Molecule Associated Protein; D000071177:Signaling Lymphocytic Activation Molecule Family Member 1; D007371:Interferon-gamma