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Objective: To further illuminate a possibme mechanism of Fas/FasL in the treatment of psoriasis, the expression of it and apoptosis of KC were investigated. Methods: With cell culmre,immunocytochemistly, the expression of Fas/FasL protein after the treatment with etretin was observed in cultured human normal keratinocytes. Then, the state of apoptosis in cultured keratinocyte after stimulation with etretin was detected with FACS(Fluorescence Activited Cell Sortor). Results:(1) There was no expression of Fas/FasL protein in the cultured normal human KC. (2)After the treatment with etretin, the strongest expression of FasL protein appeared after 16h, so did Fas after 4Oh. (3) The higher the concentration of etretin, the stronger the expression of Fas/FasL protien. Under the same condition, the expression of Fas is stronger than that of FasL. (4) Keratinocytes‘ apoptosis occurred after stimulation with etretin. Conclusion: Fas/FasL system wasn‘ t involved in apoptosis in cultured normol human keratinocytes. But during limited period, the apoptosis of KC could be induced by etretin, thus it can antagonize benign proliferate of keratinocytes. Our data showed up-regulation of the expression of Fas/FasL and apoptosis in cultured human keratinocytes stimulated by etretin, and its function may be involved in the therapeutic machanism of psoriasis.  相似文献   
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