title: IL-2 receptor(p55)/Tac-inducing factor. Purification and characterization of adult T cell leukemia-derived factor.
abstract: Many human T cell lymphotropic virus-I (HTLV-I) transformed T cells from adult T cell leukemia (ATL) patients continuously produce a humoral factor called ATL-derived factor (ADF) which induces IL-2R/Tac expression on T and NK cells. Using gel filtration, procion red Sepharose, DEAE, and reverse phase chromatography, we have purified ADF protein to homogeneity from 15 liters of serum-free culture supernatant of an HTLV-I(+) T cell line ATL-2. Purified ADF protein had the m.w. of 14,000 by SDS-PAGE and gel filtration, and its isoelectric point is around 5.0. ADF did not react with heteroantibodies against IL-1 alpha and IL-1 beta, which have also IL-2R/Tac-inducing activity on suitable target cells. Partial N-terminal amino acid sequence of ADF is different from other cytokines such as, IFN, BSF-2, and various IL whose cDNA has been cloned. Western blot analysis using rabbit antibodies against N-terminal 10mer synthetic peptide of ADF showed that IL-1 alpha and ADF are different proteins. ADF had its IL-2R/Tac-inducing activity not only on human NK-like cell line YT, but also on HTLV-I(+) T cells, such as ED. In contrast, macrophage-derived IL-1 lacked IL-2R/Tac-inducing activity on ED cells despite their IL-2R/Tac induction on YT, indicating that ADF and IL-1 have their effect via different receptors.
mesh_terms: D000293:Adolescent; D000595:Amino Acid Sequence; D000918:Antibody Specificity; D002460:Cell Line; D016207:Cytokines; D006800:Deltaretrovirus Infections / Q000032:analysis*; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D007375:Interleukin-1 / Q000276:immunology / Q000494:pharmacology; D007694:Killer Cells, Natural / Q000187:drug effects; D008213:Lymphocyte Activation; D008297:Male; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000276:immunology / Q000302:isolation & purification* / Q000494:pharmacology; D011971:Receptors, Immunologic / Q000096:biosynthesis; D015375:Receptors, Interleukin-2; D013601:T-Lymphocytes / Q000032:analysis* / Q000187:drug effects
chemical_list: D016207:Cytokines; D007375:Interleukin-1; D009363:Neoplasm Proteins; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2; C055533:adult T cell leukemia-derived factor