title: Interleukin-2 receptor-inducing factor(s) in adult T cell leukemia.
abstract: The expression of the interleukin-2 receptor (IL-2-R) is regulated by transcriptional and post-transcriptional mechanisms. IL-2-R gene expression is induced by pharmacological agents including calcium ions, phorbol esters such as phorbol myristate acetate (PMA) and forskolin (FK), a direct activator of adenylate cyclase. HTLV-I(+) leukemic T cells and T cell lines from patients with adult T cell leukemia (ATL) continuously expressed IL-2-R without production of IL-2. However, there was no abnormality of the structural gene for IL-2-R in these cell lines as well as in fresh leukemic cells of ATL. We have detected that many HTLV-I(+) T4(+) T cell lines constitutively produce a non-IL-2 lymphokine named ATL-derived factor (ADF), which induced the expression of the high-affinity IL-2-R on a variety of cells including HTLV-I(+) T cells, myeloid leukemia cells and YT cells. IL-2-R-inducing agents such as ADF and FK were shown to induce elevation of the mRNA levels for IL-2-R through transcriptional enhancement of the IL-2-R gene. The possible involvement of IL-2-R-inducing cytokines in the physiological lymphocyte activation and the leukemogenesis in ATL and other T cell leukemias is discussed.
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D005576:Colforsin / Q000494:pharmacology; D006800:Deltaretrovirus Infections / Q000235:genetics / Q000378:metabolism*; D005786:Gene Expression Regulation / Q000187:drug effects; D005796:Genes; D006801:Humans; D007376:Interleukin-2 / Q000494:pharmacology; D008222:Lymphokines / Q000378:metabolism* / Q000494:pharmacology; D008934:Mitogens / Q000494:pharmacology; D011401:Promoter Regions, Genetic; D011971:Receptors, Immunologic / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D015375:Receptors, Interleukin-2; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis; D013601:T-Lymphocytes / Q000378:metabolism; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014407:Tumor Cells, Cultured / Q000187:drug effects / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D007376:Interleukin-2; D008222:Lymphokines; D008934:Mitogens; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2; D011993:Recombinant Fusion Proteins; D005576:Colforsin; D013755:Tetradecanoylphorbol Acetate