Insulin-like growth factor-I stimulates IL-10 production in human T cells

Journal of Leukocyte Biology - Tập 76 Số 4 - Trang 862-867 - 2004
Ron Kooijman1, Astrid Coppens1
1Laboratory for Neuroendocrine Immunology, Department of Pharmacology, Medical School, Free University of Brussels (VUB) , Belgium

Tóm tắt

AbstractThere is vast body of evidence that the insulin-like growth factor (IGF)-I exerts immunomodulatory effects in vitro and in vivo. In vitro studies indicate that stimulatory effects of IGF-I may be exerted through augmentation of inflammatory cytokine production. To further explore the immunomodulatory effects of IGF-I through regulation of cytokine production, we tested the in vitro effects of IGF-I on the secretion of inflammatory T helper cell type 1 (Th1) and Th2 cytokines by human peripheral blood mononuclear cells (PBMC). To this end, PBMC were stimulated with the T cell mitogen phytohemagglutinin (PHA), and cytokines in the culture media were assessed after 18, 42, 66, and 80 h of culture. We found that IGF-I stimulated the secretion of the Th2 cytokine interleukin (IL)-10 by 40–70% in PHA-stimulated PBMC. In addition, we observed a small stimulatory effect (15%) on the secretion of another Th2 cytokine IL-4. The secretion of IL-2, IL-5, IL-6, interferon-γ, and the inflammatory cytokines IL-1β, IL-8, and tumor necrosis factor α was not or was hardly affected. IL-10 secretion was also stimulated in purified T cells, and we established that IGF-I also stimulated IL-10 mRNA expression by 100–150%. The monocyte-activating bacterial cell-wall product lipopolysaccharide induced IL-10 production in PBMC, but this was not affected by IGF-I. As IL-10 predominantly exerts anti-inflammatory actions and suppresses Th1-dependent immune responses, our results indicate that IGF-I may exert inhibitory actions on inflammatory and Th1-mediated cellular immune responses through stimulation of IL-10 production in T cells.

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Journal of Leukocyte Biology

Tập 76 Số 4

862-867

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