Monocyte induction of IL-10 and down-regulation of IL-12 by iC3b deposited in ultraviolet-exposed human skin - PubMed (original) (raw)
. 1998 Dec 1;161(11):5873-9.
Affiliations
- PMID: 9834066
Monocyte induction of IL-10 and down-regulation of IL-12 by iC3b deposited in ultraviolet-exposed human skin
Y Yoshida et al. J Immunol. 1998.
Abstract
CD11b+ monocytic/macrophagic cells (Mo/Mph), which infiltrate into skin after UV irradiation, play an important role in UV-induced immunosuppression. Because in mice, blockade of CD11b (iC3b receptor) on monocytes and depletion of its ligand, iC3b, reverses UV-induced immunosuppression, we asked whether iC3b is deposited in human skin after UV, and whether iC3b can modulate the cytokine profile of Mo/Mph. Immunofluorescence studies revealed that iC3b was newly deposited in UV-exposed skin and was localized in apposition to infiltrating CD11b+ Mo/Mph. In addition, in situ hybridization studies showed that TNF-alpha mRNA was also induced in a similar microanatomic localization. To model the effects of these complex signals on infiltrating Mo/Mph following UV exposure, we then tested the effects of immobilized iC3b and TNF-alpha on resting blood monocytes. Both IL-10 mRNA synthesis and protein secretion were significantly induced by binding of iC3b in vitro and were synergistically increased by the presence of TNF-alpha. The effect was abrogated by a blocking Ab to CD11b, indicating CD11b-iC3b interaction. In contrast, iC3b binding resulted in suppression of IL-12 p40 mRNA and significantly inhibited the production of IL-12 p70 protein. Our studies thus define a novel mechanism for induction of tissue Mo/Mph into an IL-10high/IL-12low state via iC3b in combination with TNF-alpha.
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