Activation of human T lymphocytes via the CD2 antigen results in tyrosine phosphorylation of T cell antigen receptor zeta-chains.
The phosphorylation of the invariant chains associated with the human TCR has been investigated after the stimulation of T lymphocytes with CD2 mAb T11(2) and T11(3), PHA, or phorbol 12,13-dibutyrate. As described previously, stimulation of T cells with either CD2 mAb or phorbol 12,13-dibutyrate resulted in the phosphorylation of the CD3 gamma-chain. The combination of T11(2) and T11(3) mAb also induced phosphorylation of the TCR zeta-chain. The phosphorylated zeta-polypeptide of CD2-activated cells was immunoprecipitated with antiphosphotyrosine antibodies and migrated to a 21- to 23-kDa position during SDS/PAGE. These results indicate that stimulation of human T cells via the CD2 Ag with the T11(2) and T11(3) mAb activates not only protein kinase C but also tyrosine kinase(s), resulting in the phosphorylation of the CD3 gamma-chain and the tyrosine phosphorylation of the zeta-chain, respectively.
Monostori
E
E
Cell Surface Biochemistry, Imperial Cancer Research Fund, London, UK.
Desai
D
D
Brown
M H
MH
Cantrell
D A
DA
Crumpton
M J
MJ
D000945:Antigens, Differentiation, T-Lymphocyte / Q000378:metabolism* / Q000502:physiology*; D018801:CD2 Antigens; D017252:CD3 Complex; D015180:Electrophoresis, Gel, Two-Dimensional; D004789:Enzyme Activation; D006801:Humans; D066298:In Vitro Techniques; D008213:Lymphocyte Activation; D010766:Phosphorylation; D019000:Phosphotyrosine; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D011948:Receptors, Antigen, T-Cell / Q000378:metabolism*; D011971:Receptors, Immunologic / Q000502:physiology*; D015398:Signal Transduction; D013601:T-Lymphocytes / Q000276:immunology*; D014443:Tyrosine / Q000031:analogs & derivatives / Q000378:metabolism
D000945:Antigens, Differentiation, T-Lymphocyte; D018801:CD2 Antigens; D017252:CD3 Complex; D011948:Receptors, Antigen, T-Cell; D011971:Receptors, Immunologic; D019000:Phosphotyrosine; D014443:Tyrosine; D011505:Protein-Tyrosine Kinases