[Effect of curcumin on IL-17-induced nitric oxide production and expression of iNOS in human keratinocytes].

AIM To investigate the effect of curcumin on IL-17-induced NO production, mRNA and protein expression of iNOS in human keratinocyte cell lines(HaCaT cells). METHODS HaCaT cells were stimulated with IL-17 and incubated with three doses of curcumin for 24h in vitro. After collections of supernatant, total RNA and protein, NO levels in supernatant were detected and fluorescence quantitative PCR and Western blot were performed to determine the effect of curcumin on NO levels and iNOS. RESULTS IL-17 increased NO levels, and expression of iNOS in HaCaT cells(P<0.01). Curcumin decreased IL-17 induced NO production and the iNOS expression at mRNA (P<0.01) and protein (P<0.01) levels significantly. CONCLUSION Curcumin down-regulates IL-17-induced NO secretions and iNOS expression in HaCaT cells, thus provides a theoretical basis for the treatment of inflammatory diseases of skin related to keratinocytes.