他扎罗汀联合干扰素γ对角质形成细胞HLA-DR表达的影响

Effects of Tazarotene Combined with Interferon-γon the Expression of HLA-DR in Cultured Hu-man Keratinocytes

目的探讨他扎罗汀对角质形成细胞(KC)增殖及他扎罗汀、干扰素(IFN)-γ及二者联合对HLA-DR在KC上表达的影响,为他扎罗汀的抗增殖作用及其对炎症的影响进行初探.方法①体外培养正常人KC;②用MTT法检测他扎罗汀对KC增殖的影响;③用免疫组化的方法,分别观察他扎罗汀组、IFN-γ组及二者联合组对HLA-DR在KC上表达的影响.结果①10-7～10-5 mol/L他扎罗汀作用KC 24 h、48 h后,处理组的细胞增殖较对照组显著降低且呈剂量依赖性;②正常人KC基本不表达HLA-DR;③10-6 mol/L他扎罗汀作用24 h后,不能诱导KC表达HLA-DR;④500 U/mL IFN-γ处理24 h后可明显诱导KC表达HLA-DR;⑤10-7～10-5 mol/L他扎罗汀联合IFN-γ组作用24 h后,KC上HLA-DR的表达诱导作用较单独IFN-γ组显著增强(P＜0.005),且呈剂量依赖性.结论他扎罗汀对体外培养的KC增殖有抑制作用;他扎罗汀对IFN-γ诱导KC表达HLA-DR有增强作用.

Objective To investigate the effects of tazarotene on the proliferation of cultured human keratinocytes and IFN-γ-induced expression of HLA-DR in those cells.Methods Keratinocytes were cul-tured from normal human skin in vitro,and were treated with various concentrations of tazarotene(10 -5 ,10 -6 ,10 -7 mol/L).At24h,48h after treatment,the effects on cell proliferation were assessed by MTT method.The expression of HLA-DR was determined using immunocytochemistry techniques in cultured human ker-atinocytes incubated with tazarotene,IFN-γor both for24h.Results①The proliferation of keratinocytes was decreased when exposed to10 -7 -10 -5 of tazarotene as compared to non-exposed keratinocytes after24h and48h.Moreover,the effects on cell proliferation by tazarotene were dose-dependent;②There was rare expression of HLA-DR in normal human keratinocytes.③HLA-DR expression was inducible significantly with500u/mL of IFN-γ,but failed to be induced with10 -6 mol/L of tazarotene,in keratinocytes at24h af-ter treatment.④After24h combined treatment of10 -7 -10 -5 mol/L of tazarotene and IFN-γ,the induction of HLA-DR expression was significantly stronger,in a dose-dependent manner,than IFN-γalone(P<0.005).Conclusions Treatment with tazarotene inhibits keratinocytes' proliferation.Synergic effects are no-ticed on HLA-DR expression in keratinocytes treated with the combination of both tazarotene and IFN-γin comparison with the keratinocytes treated with individual agent alone.