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PDTC对百草枯致肺纤维化大鼠TGF/β1及CTGF表达的影响

, PP. 1146-1150

Keywords: 百草枯,肺损伤,肺纤维化,TGF-β1,CTGF,四氢吡咯二硫代氨基甲酸酯

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Abstract:

目的观察急性百草枯(PQ)中毒大鼠转化生长因子β1(TGF-β1)及结缔组织生长因子(CTGF)表达水平的变化,探讨四氢吡咯二硫代氨基甲酸酯(PDTC)的治疗机制。方法SD大鼠144只随机分为对照组6只、PDTC对照组36只、PQ染毒组56只、PDTC干预组46只。染毒组和干预组给予生理盐水稀释PQ80mg?kg-1一次性灌胃后2h,干预组给予PDTC100mg?kg-1一次性腹腔注射,染毒组给予等量生理盐水腹腔注射;对照组和PDTC对照组于生理盐水1mg?kg-1灌胃后2h,PDTC对照组给予PDTC100mg?kg-1一次性腹腔注射,对照组给予等量生理盐水腹腔注射。于不同处理后1、3、7、14、25、56d观察大鼠中毒表现及肺组织病理改变;测定肺组织羟脯氨酸(Hyp)含量;ELISA测定血清TGF-β1水平;Westernblot测定肺组织CTGF蛋白表达;分析TGF-β1、CTGF与Hyp含量的相关性。结果大鼠染毒后与对照组比较,血清TGF-β1含量各时段均明显升高,差异有统计学意义(P<0.05或P<0.01);肺组织CTGF蛋白表达随时间延长而逐渐升高,各时段明显高于对照组(P<0.05或P<0.01);肺组织Hyp含量14、28、56d明显升高(P<0.01)。经PDTC治疗后,各时段TGF-β1、CTGF蛋白水平明显降低,差异有统计学意义(P<0.05或P<0.01);Hyp含量在28、56d明显降低(P<0.01);TGF-β1、CTGF与Hyp含量均为正相关(P<0.05或P<0.01);病理检查PDTC干预组肺组织炎症及纤维化程度均较轻。结论TGF-β1、CTGF表达增强是参与PQ致肺损伤的重要机制;PDTC可能通过抑制NF-κB活化,降低TGF-β1水平及其下游因子CTGF的蛋白表达,减轻PQ中毒大鼠的肺损伤。

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