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immunohistochemistry. Furthermore,Western blot was used to detect the expression of mitochondrial andaging⁃related proteins. Mouse
renal tubular epithelial cells were cultured in vitro and stimulated with transforming growth factor⁃β(TGF⁃β). Western blot was used to
detect the expression of α⁃SMA,Fibronectin,and Vimentin in tubular epithelial cells with or without MA⁃5 intervention. Results:
Seven days after UUO,Masson and Sirius Red staining of renal tissue showed that the UUO group had severe renal fibrosis,and the
UUO + MA ⁃ 5 group had significantly reduced renal fibrosis compared to the UUO group. The results of Western Blot and
immunohistochemistry showed that the expression of α⁃SMA and Col1 in the UUO+MA⁃5 group was significantly lower than that in the
UUO group(P < 0.05). Further study showed that mitochondrial biosynthesis,fusion and motility were decreased in the UUO group,
with decreased expression of superoxide dismutase 2(SOD2). MA⁃5 treatment significantly increased the expression of Mitofilin in the
kidney of UUO mice,improved mitochondrial function,and increased the expression of peroxisome⁃proliferator⁃activated receptor γ
coactivator 1⁃α(PGC1⁃α),Mitofusin 2(Mfn2),the mitochondrial Rho GTPase 1(Miro1)and SOD2(all P < 0.05). The results in vitro
showed that MA⁃5 could reduce the expression of fibrosis⁃related proteins induced by TGF⁃β in cultured tubular epithelial cells(P <
0.05). Conclusion:Renal fibrosis occurs in mice after UUO,and MA⁃5 can attenuate TGF⁃β induced tubular epithelial cells fibrosis
by maintaining mitochondrial homeostasis.
[Key words] renal fibrosis;mitochondria;MA⁃5
[J Nanjing Med Univ,2025,45(03):311⁃318]
慢性肾脏病(chronic kidney disease,CKD)已逐 脏纤维化的影响目前尚不清楚,其作用机制是否与
渐成为威胁全世界公共健康的主要疾病之一。近 线粒体功能改变有关仍需进一步验证。为此,本研
期的流行病学调查结果显示我国 CKD 的发病率高 究构建单侧(左侧)输尿管梗阻(unilateral ureteral
达8.2%,其中相当一部分患者最终会进展至终末期 obstruction,UUO)诱导小鼠肾纤维化模型和转化生
肾脏病,极大地增加了家庭和社会的负担 。延缓 长因子(transforming growth factor,TGF)⁃β诱导肾小
[1]
CKD 进展以及防治相关并发症是肾脏病研究领域 管上皮细胞纤维化模型探究线粒体靶向药物 MA⁃5
需攻克的一大难关。 对肾脏纤维化的作用及相关机制。
肾脏纤维化以细胞外基质过度沉积为特征,是
1 材料和方法
CKD 的主要病理特征之一 。线粒体作为能量代
[2]
谢、自由基生成及各种信号途径相关的重要器官, 1.1 材料
其功能障碍在 CKD 的发病机制中起着至关重要的 1.1.1 实验动物
作用 [3- 4] 。Mitochonic acid 5(MA⁃5)是由日本学者 实验动物购自南京江宁区青龙山动物繁殖场,
Tetsuro Matsuhashi 等新合成的植物激素吲哚⁃3⁃乙 为24只6~8周龄的雄性SPF级C57BL/6J背景小鼠,
酸衍生物,该研究团队首次报道 MA⁃5 可与线粒 体重20~22 g。于动物房适应性饲养1周,期间予自
体内膜蛋白 Mitofilin 结合,具有促进三磷酸腺苷 由进食饮水。动物实验均符合医学动物伦理要求
(adenosine triphosphate,ATP)再生的效果,并且在 (IACUC:1808003)。
缺血再灌注和顺铂诱导的急性肾损伤小鼠模型 1.1.2 细胞与试剂
中证实。Mitofilin 是线粒体接触部位和嵴组织系 小鼠近端肾小管上皮细胞系(mouse renal tubular
统(mitochondrial contact site and cristae ⁃ organizing epithelial cells,mRTEC)(上海中科院细胞);MA⁃5
system,MICOS)复合物中最新被发现参与调控线粒 (南京倍特医药科技生物有限公司);水合氯醛
体嵴形态的关键蛋白。MA⁃5 可通过 Mitofilin 改善 (上海源叶生物科技有限公司);甘油醛⁃3⁃磷酸脱
肾小管上皮细胞线粒体功能进而减轻蛋白尿,改 氢 酶(glyceraldehyde ⁃ 3 ⁃ phosphate dehydrogenase,
善小鼠肾功能 [5-7] 。进一步体外生物能量研究中, GAPDH)抗体(武汉三鹰生物技术有限公司);平
MA⁃5促进ATP 的产生,降低线粒体活性氧(reactive 滑肌肌动蛋白α(α⁃smooth muscle actin,α⁃SMA)、
oxygen species,ROS)的水平,而不影响线粒体复合 Ⅰ型胶原蛋白(collagenⅠ,Col1)、线粒体融合蛋白2
物Ⅰ~Ⅳ的活性,说明MA⁃5独立于氧化磷酸化和电 (Mitofusin 2,Mfn2)、线粒体 Rho GTP 酶 1(the mito⁃
子传递链调节线粒体ATP合成 [5,7] 。然而MA⁃5对肾 chondrial Rho GTPase 1,Miro1)、Mitofilin抗体(Abcam

