Journal
JOURNAL OF LEUKOCYTE BIOLOGY
Volume 88, Issue 2, Pages 303-311Publisher
WILEY
DOI: 10.1189/jlb.1009659
Keywords
cytokines; anti-inflammation; antigen presentation
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Funding
- Research Fund for the Control of Infectious Diseases [RFCID 09080512]
- Research Grants Council of Hong Kong [HKU 7594/06M, HKU 7685/09M]
- University of Hong Kong
- Edward SK Hotung Pediatrics Education and Research Fund
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IL-10, a potent anti-inflammatory cytokine, activates its primary mediator STAT3 to exert inhibitory effects on activated immune response. It has been reported that IFN-gamma signaling can be suppressed by IL-10, which deactivates macrophages and suppresses cell-mediated antigen presentation. Cathepsin S, a cysteine protease, plays a significant role in the antigen processing. We hypothesize that the IL-10-induced and STAT3-mediated signaling pathway interferes with IFN-gamma-induced immune responses in primary human blood macrophages. Here, we investigated whether IL-10 perturbs MHC-II levels via its effect on cathepsin S expression in antigen processing. We showed that the expression of cathepsin S and MHC-II, inducible by IFN-gamma, was down-regulated in the presence of IL-10. Additionally, we revealed that the inhibitory effect of IL-10 was demonstrated to be independent of the classical IFN-gamma-induced JAK2/STAT1 signaling cascade or the NF-kappa B pathway. Following STAT3 suppression with specific siRNA, the expression of IFN-gamma-induced surface MHC-II antigens and cathepsin S levels was restored, even in the presence of IL-10. Taken together, our results demonstrated that the immunosuppressive effects of IL-10-STAT3 on MHC-II antigen presentation may occur via the inhibition of cathepsin S expression. J. Leukoc. Biol. 88: 303-311; 2010.
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