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第45卷第3期                           南京医科大学学报(自然科学版)
                  2025年3月                   Journal of Nanjing Medical University(Natural Sciences)     ·311 ·


               ·基础研究·

                线粒体靶向药物Mitochonic acid 5调控线粒体稳态减轻肾脏纤

                维化的机制研究



                钱 力,陈 晨,李 青,吴 琳,邢昌赢,毛慧娟,袁杨刚                          *

                南京医科大学第一附属医院肾内科,南京 210029



               [摘   要] 目的:探讨线粒体靶向药物Mitochonic acid 5(MA⁃5)对肾脏纤维化的影响及其作用机制。方法:选取24只8周龄的
                SPF级C57BL/6J雄性小鼠,随机分为4组,分别为对照组、MA⁃5组、单侧(左侧)输尿管梗阻(unilateral ureteral obstruction,UUO)
                组和UUO+MA⁃5组。4组小鼠均需手术暴露输尿管与肾脏,其中UUO组和UUO+MA⁃5组予以结扎处理后缝合,另外两组暴露
                后直接缝合。术后第2天开始,MA⁃5组和UUO+MA⁃5组均予MA⁃5连续灌胃给药至第7天,对照组及UUO组予相应剂量的食
                用玉米油灌胃。UUO 术后第 7 天留取小鼠肾脏标本及血标本。随后采用 Masson 及天狼星红染色检测肾脏纤维化程度;免
                疫组化法检测平滑肌肌动蛋白α(α⁃smooth muscle actin,α⁃SMA)和Ⅰ型胶原蛋白(collagenⅠ,Col1)表达水平;Western blot检测
                线粒体及衰老相关蛋白表达水平。体外培养的小鼠肾小管上皮细胞,使用转化生长因子(transforming growth factor,TGF)⁃β
                刺激肾小管,Western blot 检测 MA⁃5 干预和不干预情况下细胞纤维化相关指标α⁃SMA、Fibronectin、Vimentin 的表达水平。
                结果:UUO 术后7 d,小鼠肾组织切片Masson和天狼星红染色结果显示,UUO组小鼠出现严重的肾脏纤维化,UUO+MA⁃5组肾
                脏纤维化程度较UUO组明显减轻。Western blot及免疫组化结果显示,在UUO+MA⁃5组中,α⁃SMA和Col1表达较UUO组明显降
                低(P < 0.05)。进一步研究发现UUO组线粒体生物合成、融合、运动均减少,超氧化物歧化酶2(superoxide dismutase 2,SOD2)
                表达降低。MA⁃5可以提高UUO模型中肾脏Mitofilin的表达,改善线粒体功能,增加过氧化物酶体增殖物激活受体γ共激活因
                子⁃1α(peroxisome⁃proliferator⁃activated receptor γ coactivator 1⁃α,PGC1⁃α)、线粒体融合蛋白 2(Mitofusin 2,Mfn2)、线粒体 Rho
                GTP酶1(the mitochondrial Rho GTPase 1,Miro1)、SOD2的表达(P < 0.05)。体外培养的肾小管上皮细胞实验结果显示,MA⁃5降
                低TGF⁃β导致的肾小管上皮细胞纤维化相关指标的表达(P < 0.05)。结论:UUO术后小鼠出现肾脏纤维化改变,MA⁃5可以通
                过维持线粒体稳态,减轻TGF⁃β诱导的肾小管上皮细胞的纤维化。
               [关键词] 肾脏纤维化;线粒体;MA⁃5
               [中图分类号] R692                      [文献标志码] A                      [文章编号] 1007⁃4368(2025)03⁃311⁃08
                doi:10.7655/NYDXBNSN240954


                Mechanism research of mitochondria ⁃ targeted drug Mitochonic acid 5 regulating
                mitochondrial homeostasis to alleviate renal fibrosis

                                                                                             *
                QIAN Li,CHEN Chen,LI Qing,WU Lin,XING Changying,MAO Huijuan,YUAN Yanggang
                1 Department of Nephrology,the First Affiliated Hospital of Nanjing Medical University,Nanjing 210029,China


               [Abstract] Objective:To investigate the effect of mitochondrial targeting drug Mitochonic acid 5(MA⁃5)on renal fibrosis and its
                mechanism. Methods:Twenty⁃four 8⁃week⁃old SPF C57BL/6J male mice were randomly divided into four groups:control group,MA⁃5
                group,unilateral ureteral obstruction(UUO)group,and UUO+MA⁃5 group. Mice in all four groups underwent surgery to expose the
                ureter and kidney. The UUO and UUO+MA⁃5 group received ureteral ligation,while the control and MA⁃5 groups had the ureter
                exposed and sutured without ligation. From the 2nd day after operation,the MA⁃5 and the UUO+MA⁃5 group received MA⁃5 by gavage
                continuously until the 7th day,whilethe control and UUO group were given the corresponding doses of corn oilby gavage. The mice
                were sacrificed on the 7th day after UUO,and the kidney and blood samples were collected. Subsequently,Masson and Sirius Red
                staining were used to assess renal fibrosis. The expression of α⁃smooth muscle actin(α⁃SMA)and CollagenⅠ(Col1)were explored by


               [基金项目] 国家自然科学基金(82170699,81870469,81670628)
                通信作者(Corresponding author),E⁃mail:ygyuan@njmu.edu.cn(ORCID:0000⁃0003⁃2764⁃9486)
                ∗
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