摘要目的 探讨卡马拉素对HaCaT细胞体外增殖及对白细胞介素17C(IL-17C)、趋化因子CCL20、NF-κB表达的影响.方法 用不同浓度卡马拉素组(0.5、1.0、2.0、4.0 μmol/L)、含与4.0 μmol/L卡马拉素等体积二甲基亚砜的RPMI 1640培养液(溶媒组)、RPMI 1640培养液(对照组)分别作用于HaCaT细胞.采用CCK8法检测卡马拉素作用于HaCaT细胞24、48、72 h对细胞体外增殖的影响;RT-PCR法检测卡马拉素对HaCaT细胞IL-17C和CCL20 mRNA表达的影响;Western印迹法检测卡马拉素对HaCaT细胞IL-17C、CCL20和NF-κB蛋白表达的影响.统计学处理采用重复测量的方差分析、单因素方差分析和Pearson相关分析.结果 各浓度组卡马拉素对HaCaT细胞增殖的抑制作用有随时间变化的趋势(F=126.936,P＜ 0.05),药物作用时间越长,抑制作用越强;HaCaT细胞增殖的抑制率也随卡马拉素浓度的增加而升高(F=838.308,P＜ 0.05);不同浓度卡马拉素组对HaCaT细胞体外增殖的抑制作用随时间变化的趋势不同,药物浓度与时间存在交互作用(F=15.961,P＜ 0.05).不同浓度卡马拉素作用于HaCaT细胞48 h后,IL-17C mRNA及其蛋白、CCL20 mRNA及其蛋白、NF-κB蛋白表达量均随卡马拉素浓度的增加而不断降低,差异均有统计学意义(F值分别为206.041、233.887、143.883、162.431、577.915,均P＜0.05).结论 卡马拉素可抑制HaCaT细胞的体外增殖,并可在mRNA和蛋白水平下调IL-17C、CCL20的表达,而两者表达量的降低可能与NF-κB表达下调有关.

abstractsObjective To investigate the effects of rottlerin on in vitro proliferation of and expressions of interleukin (IL)-17C,CCL20 chemokine,and nuclear factor (NF)-κB in cultured human HaCaT keratinocytes.Methods Some HaCaT cells were divided into several test groups treated with rottlerin at concentrations of 0.5,1.0,2.0 and 4.0 μmol/L,a solvent group treated with RPMI 1640 culture solution containing the same volume of dimethyl sulfoxide (DMSO) as that of 4.0 μmol/L rottlerin,and a control group treated with RPMI 1640 culture solution.Cell counting kit-8 (CCK8) assay was conducted to estimate the proliferative activity of HaCaT cells after 24-,48-and 72-hour culture,RT-PCR to determine the mRNA expressions of IL-17C and CCL20 after 48-hour culture,and Western blot to measure the protein expressions of IL-17C,CCL20 and NF-κB after 48-hour culture.Statistical analysis was carried out by using repeated-measures analysis of variance,one-way analysis of variance and Pearson correlation analysis with the SPSS16.0 software.Results Rottlerin showed an inhibitory effect on the proliferation of HaCaT cells,and the inhibitory effect increased over time (F =126.936,P ＜ 0.05) and with the increase of rottlerin concentrations (F =838.308,P ＜ 0.05),with a significant interaction effect between rottlerin concentrations and treatment duration (F =15.961,P ＜ 0.05).After 48-hour treatment,a significant decrease was observed in the mRNA and protein expressions of IL-17C (F =206.041,233.887,respectively,both P ＜ 0.05) and CCL20 (F =143.883,162.431,respectively,both P ＜ 0.05),as well as in the protein expression of NF-κB (F =577.915,P ＜ 0.05) in the test groups with the increase in rottlerin concentrations.Conclusions Rottlerin can inhibit the proliferation of HaCaT cells in vitro,and decrease the mRNA and protein expressions of IL-17C and CCL20 likely by downregulating the protein expression of NF-κB.