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The Journal of Immunology, Vol 139, Issue 5 1541-1545, Copyright © 1987 by American Association of Immunologists

ARTICLES

A urine inhibitor of interleukin 1 activity affects both interleukin 1 alpha and 1 beta but not tumor necrosis factor alpha

P Seckinger, K Williamson, JF Balavoine, B Mach, G Mazzei, A Shaw and JM Dayer

Urine from monocytic leukemia and other febrile patients contains an inhibitor of interleukin 1 (IL-1), as measured by prostaglandin E2 and collagenase production by human fibroblasts and synovial cells. With the use of recombinant IL-1, the IL-1 inhibitor was partially purified by using ammonium sulfate precipitation, anion-exchange, and gel filtration chromatographies. IL-1 inhibitory activity elutes with an 18,000 to 25,000 apparent molecular size. The same fractions also inhibit IL-1 assayed by the proliferation of murine thymocytes and human fibroblasts. Both forms of human recombinant IL-1, IL-1 alpha and IL-1 beta, which show only 26% homology, but nevertheless bind to the same receptor, are affected by this natural inhibitor to the same extent. In contrast, human recombinant tumor necrosis factor, which shares some of the biologic activities of IL-1, is not inhibited by the urinary IL-1 inhibitor. This study shows that the various biologic activities of both forms of human recombinant IL-1 are inhibited by a partially purified natural urine-derived factor.


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