title: Phosphotidylinositol-3 kinase-mediated signals in mice immunized with the 57 kDa major antigenic outer-membrane protein of Shigella dysenteriae type 1.
abstract: Antigen-specific T-cell signalling via T-cell antigen receptor stimulation was carried out in BALB/c mice immunized with the 57 kDa major antigenic component of Shigella dysenteriae 1 outer-membrane proteins. In presence of anti-CD3, the 57 kDa antigen was found to increase the level of IL-2 significantly instead of IL-4. IL-2 production in T cells was consistent with an increase in intracellular free Ca(2+) [(Ca(2+))i] concentration. The antigen-specific modulation was observed during T-cell signalling, with enhanced release of [(Ca(2+))i]. IL-2-receptor stimulation via IL-2 did not significantly induce the release of IL-2 with consistent intracellular Ca(2+) production. Furthermore, the protein tyrosine kinase was activated during anti-CD3 stimulation, which up-regulated the phosphatidylinositol kinase of p85-mediated serine kinase protein kinase-C of p70. Phosphoinositide-specific kinases are regulated by the phosphorylation of tyrosine kinase through the activation of the T-cell antigen receptor. The above findings indicate that phosphotidylinositol-3 kinase-mediated signals are up-regulated through [(Ca(2+))i], which is essential for Th1-type responses.
authors.affiliation: Division of Immunology and Vaccine Development, National Institute of Cholera & Enteric Diseases, P-33, CIT Road, Scheme: XM, Kolkata 700010, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Bagchi
authors.affiliation: Division of Immunology and Vaccine Development, National Institute of Cholera & Enteric Diseases, P-33, CIT Road, Scheme: XM, Kolkata 700010, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Sinha
mesh_terms: D000818:Animals; D000942:Antigens, Bacterial / Q000276:immunology*; D001425:Bacterial Outer Membrane Proteins / Q000276:immunology*; D015153:Blotting, Western; D017252:CD3 Complex / Q000276:immunology; D002118:Calcium / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D004791:Enzyme Inhibitors / Q000494:pharmacology; D047468:Immunoprecipitation; D007376:Interleukin-2 / Q000096:biosynthesis; D015847:Interleukin-4 / Q000096:biosynthesis; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism*; D000081082:Phosphoinositide-3 Kinase Inhibitors; D010766:Phosphorylation; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000378:metabolism; D011948:Receptors, Antigen, T-Cell / Q000502:physiology; D012762:Shigella dysenteriae / Q000276:immunology*; D015398:Signal Transduction / Q000502:physiology; D020123:Sirolimus / Q000494:pharmacology; D013601:T-Lymphocytes / Q000201:enzymology / Q000276:immunology*; D015854:Up-Regulation / Q000502:physiology
chemical_list: D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D017252:CD3 Complex; D002118:Calcium; D004791:Enzyme Inhibitors; D007376:Interleukin-2; D015847:Interleukin-4; D019869:Phosphatidylinositol 3-Kinases; D000081082:Phosphoinositide-3 Kinase Inhibitors; D011493:Protein Kinase C; D011948:Receptors, Antigen, T-Cell; D020123:Sirolimus