白藜芦醇抑制人结肠癌细胞增殖与 p38 MAPK 的关系研究

摘要

目的：研究白藜芦醇（ resveratrol， Res）抑制人结肠癌细胞生长的作用与p38 MAPK的可能关系。方法利用结晶紫染色、Western blot和流式细胞术检测Res对LoVo细胞增殖的抑制作用；Western blot分析Res对LoVo细胞凋亡的促进作用，以及Res对p38 MAPK磷酸化的影响；利用p38 MAPK抑制剂，通过结晶紫染色和 Western blot 实验，分析Res抑制结肠癌LoVo细胞增殖的作用与p38 MAPK之间的关系。结果与对照组相比，Res在20μmol・ L－1时就能明显抑制LoVo细胞增殖（P＜0．05），并促使细胞周期阻滞在S期，上调PCNA蛋白水平； Res能呈浓度依赖性增加Bad的蛋白水平，而抑制Bcl－2蛋白表达；Res对p38 MAPK总蛋白水平无明显影响，但可明显增加p38 MAPK的磷酸化水平；抑制p38 MAPK明显促进LoVo细胞增殖，并能减弱Res对LoVo细胞增殖的抑制作用、对Bad表达促进作用和对Bcl－2表达的抑制作用。结论 Res对LoVo细胞的增殖具有抑制作用并促进凋亡，其机制可能与Res促进p38 MAPK的磷酸化有关。%Aim To investigate the relationship be-tween the anti-proliferation effect of resveratrol ( Res ) and p38 MAPK in colon cancer cells .Methods Crys-tal violet staining , Western blot and flow cytometry were employed to analyze the effect of Res on the pro-liferation in LoVo cells.Western blot assay was used to detect the effect of Res on the apoptosis of LoVo cells and the phosphorylation of p 38 MAPK.Crystal violet staining and Western blot assay were used to analyze whether p38 MAPK was involved in the Res-induced proliferation inhibition and apoptosis in LoVo cells .Re-sults Res inhibited the proliferation , arrested cell cy-cle at S phase , and increased the protein level of PC-NA in LoVo cells apparently .Res increased the level of Bad in LoVo cells, but decreased the level of Bcl-2. Although Res exerted no substantial effects on total lev-el of p38 MAPK, it markedly increased the phospho-rylation level of p38 MAPK in LoVo cells.p38 MAPK inhibitor promoted the proliferation , and decreased the anti-proliferation effect of Res on LoVo cells .Moreo-ver , the effects of Res on the level of Bcl-2 and Bad were both reduced by the p 38 MAPK inhibitor .Con-clusions Res can inhibit the proliferation of LoVo cells, which may be partly mediated by promoting the phosphorylation of p38 MAPK.