Cadmium promotes ferroptosis in renal tubular epithelial cells by inducing autophagy

Min LI; Qian YANG; Yaxuan LIU; Huifeng PI; Bo DIAO

doi:10.16016/j.2097-0927.202203063

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Cadmium promotes ferroptosis in renal tubular epithelial cells by inducing autophagy

Basic Medicine | 更新时间：2026-01-09

- Cadmium promotes ferroptosis in renal tubular epithelial cells by inducing autophagy
- Journal of Army Medical University Vol. 44, Issue 17, Pages: 1705-1711(2022)
- 作者机构：
  
  1.430000 湖北武汉，中部战区总医院基础医学实验室
  2.430000 湖北武汉，中枢神经系统肿瘤发生与干预湖北省重点实验室
  3.510515 广东广州，南方医科大学，广州
  4.4000384 重庆，陆军军医大学军事预防医学系军队劳动卫生学教研室
  5.4000384 重庆，电磁辐射医学防护教育部重点实验室
- 作者简介：
- 基金信息：
  
  the National Natural Science Foundation for Young Scholars of China(81703267);the Natural Science Foundation of Hubei Province(2020CFB223)
- DOI：10.16016/j.2097-0927.202203063
  CLC： R322.61;R329.25;R818.03
- Received：08 March 2022，
  
  Revised：2022-04-27，
  
  Published：15 September 2022
- 稿件说明：
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Min LI, Qian YANG, Yaxuan LIU, et al. Cadmium promotes ferroptosis in renal tubular epithelial cells by inducing autophagy[J]. Journal of Army Medical University, 2022, 44(17): 1705-1711.
DOI：

Min LI, Qian YANG, Yaxuan LIU, et al. Cadmium promotes ferroptosis in renal tubular epithelial cells by inducing autophagy[J]. Journal of Army Medical University, 2022, 44(17): 1705-1711. DOI： 10.16016/j.2097-0927.202203063.

摘要

目的

研究铁自噬诱导的铁死亡在镉(cadmium

Cd)暴露致肾小管上皮细胞毒性中的作用。

方法

采用HK-2细胞构建镉暴露模型，观察CdCl

处理后细胞铁死亡、自噬、铁自噬及细胞毒性的影响。同时抑制铁死亡、自噬及铁自噬并观察其对细胞毒性的影响。

结果

镉以剂量依赖性方式诱导肾小管上皮细胞铁死亡，铁死亡标志物长链脂酰CoA合成酶(Acyl-CoA synthetase long chain family member 4

ACSL4)水平升高，谷胱甘肽过氧化物酶4(glutathione peroxidase 4

GPX4)水平降低；脂质过氧化作用抑制剂ferrastatin-1(Fer-1)和铁离子螯合剂去铁胺(deferroamine

DFO)可减轻Cd诱导的肾小管上皮细胞死亡；镉诱导肾小管上皮细胞自噬，自噬小体数量增加，自噬标志物LC3B-Ⅱ表达增加；抑制自噬减轻镉诱导的肾小管上皮细胞铁死亡；此外，镉诱导肾小管上皮细胞铁自噬，铁自噬标志物核受体共同活化子4(nuclear receptor coactivator 4

NCOA4)表达增加，铁自噬底物铁蛋白重链多肽1 (ferritin heavy chain 1

FTH)表达降低；NCOA4敲除抑制了镉诱导的储铁蛋白降解及细胞死亡。

结论

铁自噬介导的铁死亡参与了镉诱导的肾小管上皮细胞死亡。

Abstract

Objective

To investigate the role of ferritinophagy-mediated ferroptosis in renal tubular epithelial cytotoxicity induced by cadmium (Cd) exposure.

Methods

HK-2 cells were used to construct Cd exposed cell model

and the effects of Cd on ferroptosis

autophagy

ferritinophagy and cytotoxicity were observed. Meanwhile

the effects of inhibition of ferroptosis

autophagy and ferritinophagy on Cd cytotoxicity were evaluated.

Results

Cd induced ferroptosis in renal tubular epithelial cells in a dose-dependent manner

and the level of acyl-CoA synthetase long chain family member 4 (ACSL4) was increased and that of glutathione peroxidase 4 (GPX4) was decreased. Treatment of lipid peroxidation inhibitor ferrastatin-1 (Fer-1) and iron chelating agent deferroamine (DFO) attenuated Cd-induced death in renal tubular epithelial cells. Cd induced renal tubular epithelial cell autophagy

increased the number of autophagosomes

and enhanced the expression of autophagy marker LC3B-Ⅱ. Inhibition of autophagy alleviated Cd-induced ferroptosis in renal tubular epithelial cells. In addition

Cd induced ferritinophagy in renal tubular epithelial cells

and the expression of ferritinophagy marker nuclear receptor coactivator 4 (NCOA4) was elevated

while the expression of ferritin heavy chain 1(FTH)

substrate of ferritinophagy

was decreased. NCOA4 knockdown inhibited Cd-induced ferritin degradation and cell death.

Conclusion

Ferritinophagy-mediated ferroptosis is involved in Cd-induced renal tubular epithelial cell death.

关键词

Keywords

references

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