title: T-cell activation. V. Anti-major histocompatibility complex class I antibody-induced activation and clonal abortion in Jurkat T-leukaemic cells.
abstract: We have studied activation-induced changes in intracellular calcium [Ca2+]i, interleukin-2 (IL-2) secretion, and clonal abortion of the human leukaemic T-cell line Jurkat and three T-cell receptor (TcR)/CD3 receptor negative clones deficient for the TcR alpha, TcR beta and CD3 gamma chains respectively, as well as three transfectant clones reconstituted with the appropriate TcR/CD3 cDNA. For activation, the cells were exposed to anti-TcR/CD3, anti-CD2 and anti-major histocompatibility complex (anti-MHC) class I monoclonal antibodies (mAb) respectively. Cellular activation by these mAb leading to an increased IL-2 secretion was preceded by a rise in [Ca2+]i and was relatively dependent on the expression of the a TcR/CD3 complex. In contrast, anti-MHC class I mAb-induced clonal abortion in Jurkat T cells may occur without previous fluctuations in [Ca2+]i and appeared to be independent of TcR/CD3 expression. The present observation suggest the existence of different secondary messenger systems operating in Jurkat cells following activation via the TcR/CD3, CD2 and the MHC class I pathways, respectively.
authors.affiliation: Laboratory of Experimental Immunology, Panum Institute, University of Copenhagen, Denmark.
authors.forename: M H
authors.initials: MH
authors.lastname: Claesson
authors.forename: S
authors.initials: S
authors.lastname: Dissing
authors.forename: T
authors.initials: T
authors.lastname: Tscherning
authors.forename: C
authors.initials: C
authors.lastname: Geisler
mesh_terms: D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D018801:CD2 Antigens; D017252:CD3 Complex / Q000032:analysis; D002118:Calcium / Q000378:metabolism; D002460:Cell Line; D015395:Histocompatibility Antigens Class I / Q000276:immunology*; D006801:Humans; D007376:Interleukin-2 / Q000378:metabolism; D015458:Leukemia, T-Cell / Q000276:immunology*; D008213:Lymphocyte Activation / Q000276:immunology*; D009154:Mutation; D014411:Neoplastic Stem Cells / Q000473:pathology; D011971:Receptors, Immunologic / Q000032:analysis; D013601:T-Lymphocytes / Q000276:immunology*; D014162:Transfection; D014407:Tumor Cells, Cultured / Q000276:immunology
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D018801:CD2 Antigens; D017252:CD3 Complex; D015395:Histocompatibility Antigens Class I; D007376:Interleukin-2; D011971:Receptors, Immunologic; D002118:Calcium