title: Interdependence of CD3-Ti and CD2 activation pathways in human T lymphocytes.
abstract: Human T lymphocytes can be activated through either the antigen/MHC receptor complex T3-Ti (CD3-Ti) or the T11 (CD2) molecule to proliferate via an IL-2 dependent mechanism. To investigate the relationship of these pathways to one another, we generated and characterized Jurkat mutants which selectively express either surface CD3-Ti or CD2. Here we show that CD3-Ti- mutants fail to be stimulated by either pathway to increase phosphoinositide turnover, mobilize calcium or induce the IL-2 gene. The activation capacity of these mutants via CD2 as well as CD3-Ti can be restored following reconstitution of surface CD3-Ti expression upon appropriate DNA transfer (e.g. Ti beta subunit cDNA into Ti beta- Jurkat variants). Collectively, these results demonstrate that CD3-Ti and CD2 pathways are interdependent and that phosphoinositide turnover is linked to the CD3-Ti complex.
mesh_terms: D000943:Antigens, Differentiation / Q000235:genetics / Q000276:immunology*; D000945:Antigens, Differentiation, T-Lymphocyte / Q000235:genetics / Q000276:immunology*; D018801:CD2 Antigens; D017252:CD3 Complex; D002118:Calcium / Q000378:metabolism; D005796:Genes; D006801:Humans; D007294:Inositol / Q000378:metabolism; D007376:Interleukin-2 / Q000235:genetics; D008213:Lymphocyte Activation; D016169:Lymphocyte Function-Associated Antigen-1; D008285:Major Histocompatibility Complex; D011948:Receptors, Antigen, T-Cell / Q000235:genetics / Q000276:immunology*; D011971:Receptors, Immunologic / Q000235:genetics / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*; D014158:Transcription, Genetic
chemical_list: D000943:Antigens, Differentiation; D000945:Antigens, Differentiation, T-Lymphocyte; D018801:CD2 Antigens; D017252:CD3 Complex; D007376:Interleukin-2; D016169:Lymphocyte Function-Associated Antigen-1; D011948:Receptors, Antigen, T-Cell; D011971:Receptors, Immunologic; D007294:Inositol; D002118:Calcium