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27.04.2024 | Article

ACSF2 and lysine lactylation contribute to renal tubule injury in diabetes

verfasst von: Jingfang Chen, Qi Feng, Yingjin Qiao, Shaokang Pan, Lulu Liang, Yong Liu, Xiaonan Zhang, Dongwei Liu, Zhihong Liu, Zhangsuo Liu

Erschienen in: Diabetologia

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Abstract

Aims

Lactate accumulation is reported to be a biomarker for diabetic nephropathy progression. Lactate drives lysine lactylation, a newly discovered post-translational modification that is involved in the pathogenesis of cancers and metabolic and inflammatory disease. Here, we aimed to determine whether lysine lactylation is involved in the pathogenesis of diabetic nephropathy.

Methods

Renal biopsy samples from individuals with diabetic nephropathy (n=22) and control samples from individuals without diabetes and kidney disease (n=9) were obtained from the First Affiliated Hospital of Zhengzhou University for immunohistochemical staining. In addition, we carried out global lactylome profiling of kidney tissues from db/m and db/db mice using LC-MS/MS. Furthermore, we assessed the role of lysine lactylation and acyl-CoA synthetase family member 2 (ACSF2) in mitochondrial function in human proximal tubular epithelial cells (HK-2).

Results

The expression level of lysine lactylation was significantly increased in the kidneys of individuals with diabetes as well as in kidneys from db/db mice. Integrative lactylome analysis of the kidneys of db/db and db/m mice identified 165 upregulated proteins and 17 downregulated proteins, with an increase in 356 lysine lactylation sites and a decrease in 22 lysine lactylation sites decreased. Subcellular localisation analysis revealed that most lactylated proteins were found in the mitochondria (115 proteins, 269 sites). We further found that lactylation of the K182 site in ACSF2 contributes to mitochondrial dysfunction. Finally, the expression of ACSF2 was notably increased in the kidneys of db/db mice and individuals with diabetic nephropathy.

Conclusions

Our study strongly suggests that lysine lactylation and ACSF2 are mediators of mitochondrial dysfunction and may contribute to the progression of diabetic nephropathy.

Data availability

The LC-MS/MS proteomics data have been deposited in the ProteomeXchange Consortium database (https://proteomecentral.proteomexchange.org) via the iProX partner repository with the dataset identifier PXD050070.

Graphical Abstract

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Titel: ACSF2 and lysine lactylation contribute to renal tubule injury in diabetes
verfasst von: Jingfang Chen
Qi Feng
Yingjin Qiao
Shaokang Pan
Lulu Liang
Yong Liu
Xiaonan Zhang
Dongwei Liu
Zhihong Liu
Zhangsuo Liu
Publikationsdatum: 27.04.2024
Verlag: Springer Berlin Heidelberg
Erschienen in: Diabetologia
Print ISSN: 0012-186X
Elektronische ISSN: 1432-0428
DOI: https://doi.org/10.1007/s00125-024-06156-x

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ACSF2 and lysine lactylation contribute to renal tubule injury in diabetes

Abstract