外源性硫化氢减轻小鼠阻塞性肾损伤

目的:探讨外源性硫化氢(H2S)在小鼠阻塞性肾损伤中的保护作用及可能机制。方法:将8周龄的雄性C57BL/6小鼠随机分为假手术组、手术组和H2S组,每组5只,单侧输尿管结扎(UUO)构建肾阻塞模型,H_2S组小鼠腹腔注射H_2S供体硫氢化钠(Na HS),手术组和假手术组小鼠注射等体积的生理盐水,每天1次。7 d后处死小鼠,取出肾脏,提取RNA行RT-PCR检测3组小鼠肾脏内源性H_2S催化酶mRNA表达的差异;组织HE染色观察3组小鼠肾脏的组织结构的变化;Masson染色检测3组小鼠肾脏纤维化的差异;检测血浆胱抑素C含量来反映肾小球滤过能力;Western blot检测LC3、beclin-1和纤连蛋白(FN)蛋白表达的变化。结果:与假手术组相比,手术组小鼠肾脏中胱硫醚β-合成酶(CBS)、胱硫醚γ-裂解酶(CSE)和3-巯基丙酮酸硫转移酶(3-MST)的mRNA表达显著降低,胶原纤维显著增多,而H_2S组小鼠肾组织胶原纤维又比模型组显著减少。与假手术组相比,手术组小鼠肾脏中FN的蛋白表达显著升高,而H_2S组小鼠的FN表达量比手术组小鼠显著降低;与假手术组相比,手术组和H_2S组小鼠肾组织细胞中LC3-II和beclin-1蛋白表达均显著增高,而H_2S组小鼠肾组织细胞中LC3-II和beclin-1蛋白表达又显著高于手术组。结论:外源性H_2S可能通过上调细胞自噬而减轻UUO小鼠的肾纤维化。

Exogenous hydrogen sulfide attenuates obstructive kidney injury in mice

AIM:To investigate the protective effect of exogenous hydrogen sulfide (H₂S) on obstructive renal injury in mice, and to explore the possible potential mechanisms involved in this animal model. METHODS:Male C57BL/6 mice (8 weeks old) were randomly divided into sham group, operation group and H₂S group, with 5 rats in each group. The model of obstructive renal injury was induced by unilateral ureteral obstruction (UUO). The mice in H₂S group were intraperitoneally injected with NaHS daily, while the mice in sham group and operation group were administered with the same volume of saline intraperitoneally. After 7 d, the mice were executed and the renal tissues were taken out for experiments. RNA was extracted to detect the mRNA expression of H₂S catalytic enzymes in the mice of 3 groups. HE staining was performed to observe the structural changes of renal tissues in the mice. Renal fibrosis in the mice of 3 groups was evaluated by Masson staining. The content of cystatin C in the plasma was detected to reflect glomerular filtration ability. The protein expression of LC3, beclin-1 and fibronectin (FN) in the mice of 3 groups was determined by Western blot. RESULTS:Compared with sham group, the mRNA expression of cystathionine β-synthase (CBS), cystathionine γ-lyase (CSE) and 3-mercaptopyruvate sulfurtransferase (3-MST) in operation group decreased significantly. The collagen fiber content in operation group was increased significantly, while collagen fiber content in H₂S group was decreased significantly as compared with operation group. Compared with sham group, the protein expression of FN in operation group was increased significantly, while the protein expression of FN in H₂S group was decreased significantly as compared with operation group. Compared with sham group, the protein expression of LC-Ⅱ and beclin-1 in operation group was increased significantly, while the protein expression of LC-Ⅱ and beclin-1 in H₂S group was increased significantly as compared with the operation group. CONCLUSION:Exogenous H₂S possibly mitigates renal fibrosis in UUO mice by up-regulating autophagy.