丹酚酸B通过调控自噬改善UUO小鼠肾纤维化
摘要
目的:探讨丹酚酸B调控自噬改善肾纤维化的作用机制。方法:60只小鼠随机分为6组:假手术组、模型组、醋酸泼尼松(20 mg/kg)阳性对照组及丹酚酸B低、中、高剂量(50、100、200 mg/kg)组,除假手术组外各组均采用单侧输尿管梗阻(UUO)的方法建立小鼠肾纤维化模型。自造模当天各组给予相应药物,假手术组和模型组给予等体积生理盐水灌胃。术后第7天处死小鼠取肾取血,测定血清肌酐和尿素氮,HE染色和Masson染色观察肾脏组织病理变化及纤维化程度,免疫组化法观察肾间质Vimentin的表达,蛋白免疫印记法检测α-SMA及自噬相关蛋白LC3-Ⅱ、Beclin1、mTOR的表达。结果:与模型比较,丹酚酸B可降低UUO小鼠血肌酐和尿素氮水平,HE染色和Masson染色结果显示肾组织病理损伤减轻,胶原纤维沉积减少。免疫组织化学法和Western Blot结果表明丹酚酸B可使UUO小鼠肾组织中纤维化标记蛋白Vimentin、α-SMA表达下调,而自噬标记蛋白LC3-Ⅱ、Beclin1表达上调,且mTOR表达下调。结论:丹酚酸B能改善UUO模型小鼠肾纤维化,其作用机制可能与激活肾组织自噬有关。
引文
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