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The Journal of Immunology, Vol 140, Issue 8 2614-2620, Copyright © 1988 by American Association of Immunologists

ARTICLES

IL-2 receptor(p55)/Tac-inducing factor. Purification and characterization of adult T cell leukemia-derived factor

Y Tagaya, M Okada, K Sugie, T Kasahara, N Kondo, J Hamuro, K Matsushima, CA Dinarello and J Yodoi
Institute for Immunology, Faculty of Medicine, Kyoto University, Japan.

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.


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