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The Journal of Immunology, Vol 150, Issue 12 5501-5510, Copyright © 1993 by American Association of Immunologists
ARTICLES |
PA Sieling, JS Abrams, M Yamamura, P Salgame, BR Bloom, TH Rea and RL Modlin
Division of Dermatology, University of California, Los Angeles School of Medicine 90024-1750.
IL-10 and IL-4 have been shown to exert an inhibitory effect on cell- mediated immune responses. Our previous studies of leprosy demonstrated that IL-10 and IL-4 mRNA were preferentially expressed in lesions from lepromatous patients, those immunologically unresponsive individuals that manifest widespread infection. To define more precisely the regulatory roles of these two cytokines in the immune response to infection, we studied in vitro responses to Mycobacterium leprae. M. leprae triggered IL-10 release from PBMC of patients and healthy donors; the predominant source of the IL-10 was found to be monocytes/macrophages. Stimulation of PBMC in the presence of neutralizing anti-IL-10 mAb indicated that endogenous IL-10 production inhibits PBMC proliferation and release of TNF-alpha, GM-CSF, and IFN- gamma. Paradoxically, studies using neutralizing anti-IL-4 mAb indicated that endogenous IL-4 production enhances PBMC proliferative responses most strikingly in lepromatous patients. We found that rIL-4 expanded CD8+ T cells from lepromatous patients in vitro. CD8+ T cells from lepromatous patients have been shown to suppress CD4+ T cell responses, in part by the release of IL-4. Our study indicated that endogenous IL-4 production inhibited IL-10 secretion and, concomitantly, increased TNF-alpha and GM-CSF release. The present data suggest that, on balance, IL-4 and IL-10 contribute to immunosuppression in human infectious disease.
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