title: Changes in gene expression induced by a phorbol diester: expression of IL 2 receptor, T3, and T cell antigen receptor.
abstract: Phorbol esters cause an apparent differentiation of human T leukemic cell lines. It was shown previously that TPA induces the expression of the interleukin 2 (IL 2) receptor and the T3 complex on some T cell lines, including CCRF-CEM. We demonstrate that expression of the IL 2 receptor correlated with an induction of the 3.5 and 1.5 kb IL 2 receptor mRNA. In addition, the TPA-induced expression of the T3 polypeptides was found to be accompanied by induction of a putative T cell antigen receptor heterodimer on CEM cells. This was demonstrated by the co-precipitation of the T cell receptor with T3 from digitonin-solubilized cells. The cells expressed high levels of T3 delta- and T cell receptor beta-chain mRNA in the absence of TPA. The effect of TPA was to cause a rapid accumulation of T cell receptor alpha-chain mRNA. This suggested that the alpha-chain gene was rearranged before TPA induction and that expression of the T cell receptor/T3 complex on the cell surface was regulated by the level of alpha-chain expression. It was also shown that cloned sublines of CEM cells which expressed different T cell antigen phenotypes differed in their response to TPA.
mesh_terms: D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface / Q000235:genetics*; D002460:Cell Line; D005434:Flow Cytometry; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D012333:RNA, Messenger / Q000235:genetics; D011948:Receptors, Antigen, T-Cell / Q000235:genetics*; D011971:Receptors, Immunologic / Q000235:genetics*; D015375:Receptors, Interleukin-2; D013601:T-Lymphocytes / Q000276:immunology / Q000502:physiology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface; D012333:RNA, Messenger; D011948:Receptors, Antigen, T-Cell; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2; D013755:Tetradecanoylphorbol Acetate