title: Evidence for aberrant activation of the interleukin-2 autocrine loop by HTLV-1-encoded p40x and T3/Ti complex triggering.
abstract: In this study we provide evidence that distinct DNA sequences within the 5'-flanking regions of the genes for interleukin-2 (IL-2) and its receptor (IL-2R) are involved in human T-cell-specific activation of transcription by p40x, a product of human T cell leukemia virus type I (HTLV-1). The same DNA sequences appear to be responsible for induction of the genes in a T cell line, Jurkat, by mitogens. Although the IL-2 gene sequences are activated by p40x with much lower efficiency than the IL-2R gene sequences, they are synergistically activated by the p40x expression and subsequent extracellular stimulation by Concanavalin-A or anti-T3. We propose a model for two-step activation of the IL-2 autocrine loop in ATL development.
mesh_terms: D002460:Cell Line; D003208:Concanavalin A / Q000494:pharmacology; D017977:Deltaretrovirus / Q000235:genetics*; D006801:Humans; D007376:Interleukin-2 / Q000235:genetics*; D008213:Lymphocyte Activation; D010835:Phytohemagglutinins / Q000494:pharmacology; D011971:Receptors, Immunologic / Q000235:genetics*; D015375:Receptors, Interleukin-2; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D014158:Transcription, Genetic; D014764:Viral Proteins / Q000235:genetics / Q000494:pharmacology*
chemical_list: D007376:Interleukin-2; D010835:Phytohemagglutinins; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2; D014764:Viral Proteins; D003208:Concanavalin A