Persistent Activation of Autophagy After Cisplatin Nephrotoxicity Promotes Renal Fibrosis and Chronic Kidney Disease.

Persistent Activation of Autophagy After Cisplatin Nephrotoxicity Promotes Renal Fibrosis and Chronic Kidney Disease.
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顺铂肾毒性后自噬的持续激活会促进肾纤维化及慢性肾脏病的发生。

DOI:
10.3389/fphar.2022.918732
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发表时间:
2022
影响因子:
5.6
通讯作者:
Dong, Zheng
Dong, Zheng
中科院分区:
医学2区
文献类型:
--
作者:
Fu, Ying;Xiang, Yu;Wu, Wenwen;Cai, Juan;Tang, Chengyuan;Dong, Zheng

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自噬是真核细胞中高度保守的分解代谢途径,有助于维持肾脏的稳态和功能。急性肾损伤(AKI)后,肾小管细胞中的自噬被激活,作为一种内在的保护机制。然而,自噬在 AKI 后慢性肾脏病理(包括肾纤维化)发展中的作用仍不清楚。在这项研究中,我们在重复低剂量顺铂 (RLDC) 治疗的肾毒性后检测到小鼠肾脏中持续的自噬激活。 3-甲基腺嘌呤 (3-MA) 和氯喹 (CQ) 分别是自噬起始阶段和降解阶段的抑制剂,可阻断自噬通量并改善 RLDC 后小鼠的肾脏修复,如肾脏重量、肾功能和较少的间质纤维化所示。在体外,RLDC 诱导肾小管细胞出现促纤维化表型,包括促纤维化细胞因子的产生和分泌。值得注意的是,自噬抑制剂阻断了 RLDC 诱导的这些细胞中促纤维化细胞因子的分泌。总之,结果表明 AKI 后持续的自噬会诱导肾小管细胞中的促纤维化细胞因子,促进肾纤维化和慢性肾脏疾病。
Autophagy, a highly conserved catabolic pathway in eukaryotic cells, contributes to the maintenance of the homeostasis and function of the kidney. Upon acute kidney injury (AKI), autophagy is activated in renal tubular cells to act as an intrinsic protective mechanism. However, the role of autophagy in the development of chronic kidney pathologies including renal fibrosis after AKI remains unclear. In this study, we detected a persistent autophagy activation in mouse kidneys after nephrotoxicity of repeated low dose cisplatin (RLDC) treatment. 3-methyladenine (3-MA) and chloroquine (CQ), respective inhibitors of autophagy at the initiation and degradation stages, blocked autophagic flux and improved kidney repair in post-RLDC mice, as indicated by kidney weight, renal function, and less interstitial fibrosis. In vitro, RLDC induced a pro-fibrotic phenotype in renal tubular cells, including the production and secretion of pro-fibrotic cytokines. Notably, autophagy inhibitors blocked RLDC-induced secretion of pro-fibrotic cytokines in these cells. Together, the results indicate that persistent autophagy after AKI induces pro-fibrotic cytokines in renal tubular cells, promoting renal fibrosis and chronic kidney disease.
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