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The Journal of Immunology, Vol 139, Issue 6 1902-1910, Copyright © 1987 by American Association of Immunologists
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CA Dinarello, T Ikejima, SJ Warner, SF Orencole, G Lonnemann, JG Cannon and P Libby
Interleukin 1 (IL-1) plays an important role in host defense mechanisms by increasing body temperature, inducing the synthesis of a variety of lymphokines and hepatic acute phase proteins and acting as a chemoattractant for lymphocytes. However, in some microenvironments such as injured tissue or joint spaces, elevated IL-1 levels may contribute to pathologic processes, for example, proliferation and fibrosis of tissue involved in pannus formation as well as degradation of matrix and abnormal tissue architecture. To investigate potential mechanisms that may lead to excessive production of IL-1, we have examined the ability of IL-1 to participate in an amplification event by inducing its own gene expression leading to synthesis of biologically active IL-1. When injected into rabbits, recombinant human IL-1-alpha induced biphasic fevers, and during the second temperature elevation 3 hr later, a circulating pyrogenic material was detected by passive transfer of plasma to other rabbits. Induction of the biphasic fever was not caused by endotoxin contamination of the recombinant IL- 1. The 3-hr circulating pyrogen was heat-labile and was not residual injected IL-1-alpha. Chromatographic separation of this plasma and biologic assay suggested that it was new IL-1 of rabbit origin. We next incubated human blood mononuclear cells with recombinant IL-1-alpha and measured the intracellular and extracellular levels of IL-1 by bioassay using the D10.G4.1 murine T cell line. In order to control for the carryover of recombinant IL-1-alpha used to stimulate the mononuclear cells (MNC), we used neutralizing antibodies that were specific for IL- 1-alpha or IL-1-beta. The results of these neutralizations showed that recombinant human IL-1-alpha induces the synthesis of IL-1-beta in human MNC in vitro. These results were verified with a radioimmunoassay specific for IL-1-beta. At concentrations of 100 ng/ml, IL-1-alpha induced prostaglandin E2 production in the MNC culture, and this was associated with decreased production of immunoreactive IL-1-beta. Adding indomethacin to the cultures prevented the decreased production of IL-1-beta induced by high concentrations of IL-1-alpha. Using nonadherent MNC, we observed an increase in IL-1-beta as well as IL-1- alpha mRNA after 4 hr of exposure to recombinant IL-1-alpha. These results demonstrate that IL-1-alpha induces biologically active and immunoreactive IL-1-beta from MNC in vitro and that the same concentrations of IL-1-alpha induce gene expression for both forms of IL-1.(ABSTRACT TRUNCATED AT 400 WORDS)
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