Klotho alleviates oxidative stress and mitochondrial dysfunction through the Nrf2/HO-1 pathway, thereby reducing renal senescence induced by calcium oxalate crystals

被引:1
作者
Xu, Yuexian [1 ,2 ,3 ]
You, Jianmin [1 ,2 ,3 ]
Yao, Junfeng [1 ,2 ,3 ]
Hou, Bingbing [1 ,2 ,3 ]
Wang, Wei [1 ,2 ,3 ,4 ]
Hao, Zongyao [1 ,2 ,3 ]
机构
[1] Anhui Med Univ, Affiliated Hosp 1, Dept Urol, Hefei, Peoples R China
[2] Anhui Med Univ, Inst Urol, Hefei, Peoples R China
[3] Anhui Med Univ, Anhui Prov Key Lab Urol & Androl Dis Res & Med Tra, Hefei, Peoples R China
[4] Anhui Med Univ, Fuyang Hosp, Dept Urol, Fuyang 236000, Peoples R China
基金
中国国家自然科学基金;
关键词
Kidney stones; Mitochondrial dysfunction; Renal senescence; Oxidative stress; Klotho; CELLULAR SENESCENCE; IN-VIVO; KIDNEY FIBROSIS; INJURY; EXPRESSION; GENE; REGULATOR; MANAGEMENT; APOPTOSIS; EFFECTOR;
D O I
10.1007/s00240-025-01734-z
中图分类号
R5 [内科学]; R69 [泌尿科学(泌尿生殖系疾病)];
学科分类号
1002 ; 100201 ;
摘要
Klotho is an antiaging protein that is primarily secreted by the kidneys. This study aimed to explore the protective effects of Klotho against calcium oxalate (CaOx) crystal-induced renal aging and the underlying mechanisms involved. We established a mouse model of CaOx crystal deposition via the intraperitoneal injection of glyoxylate (Gly) and constructed an in vitro model by stimulating HK2 cells with calcium oxalate monohydrate (COM). Renal aging levels were assessed through beta-galactosidase (SA-beta-gal) staining and the detection of senescence-associated markers. By overexpressing Klotho both in vitro and in vivo, we examined oxidative stress, mitochondrial function, and renal aging levels. We then evaluated the role of Nrf2/HO-1 signalling pathway-mediated oxidative stress in CaOx crystal-induced renal aging by applying the oxidative stress scavenger N-acetylcysteine (NAC) and overexpressing or inhibiting Nrf2 in HK2 cells. We subsequently overexpressed Klotho while inhibiting Nrf2 to confirm that Klotho exerts its protective effects through the Nrf2/HO-1 pathway. Finally, we measured the methylation levels of the Klotho promoter and assessed the degree of renal aging induced by CaOx crystals after the inhibition of Klotho DNA methylation. We found that the overexpression of Klotho alleviated CaOx crystal-induced oxidative stress and mitochondrial dysfunction, thereby reducing renal aging. NAC mitigated CaOx crystal-induced renal aging. The overexpression of Nrf2 alleviated CaOx crystal-induced oxidative stress and mitochondrial dysfunction, thus reducing renal aging, whereas the knockdown of Nrf2 exacerbated CaOx crystal-induced oxidative stress and mitochondrial dysfunction, leading to more severe renal aging. The combination of Klotho overexpression and Nrf2 knockdown reversed the protective effects of Klotho. CaOx crystals induced an increase in the DNA methylation levels of Klotho in the kidneys, and the inhibition of DNA methylation alleviated CaOx-induced renal aging. This study revealed that Klotho plays a crucial role in calcium oxalate crystal-induced kidney senescence by influencing kidney oxidative stress and mitochondrial function through the Nrf2/HO-1 pathway.
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页数:19
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