1. Academic Validation
  2. Sirtuin 3 regulates mitochondrial protein acetylation and metabolism in tubular epithelial cells during renal fibrosis

Sirtuin 3 regulates mitochondrial protein acetylation and metabolism in tubular epithelial cells during renal fibrosis

  • Cell Death Dis. 2021 Sep 13;12(9):847. doi: 10.1038/s41419-021-04134-4.
Yu Zhang 1 Ping Wen 1 Jing Luo 1 Hao Ding 1 Hongdi Cao 1 Weichun He 1 Ke Zen 2 Yang Zhou 3 Junwei Yang 4 Lei Jiang 5
Affiliations

Affiliations

  • 1 Center for Kidney Disease, The second Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu, 210003, China.
  • 2 State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University Advanced Institute of Life Sciences, Nanjing, Jiangsu, 210093, China.
  • 3 Center for Kidney Disease, The second Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu, 210003, China. [email protected].
  • 4 Center for Kidney Disease, The second Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu, 210003, China. [email protected].
  • 5 Center for Kidney Disease, The second Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu, 210003, China. [email protected].
Abstract

Proximal tubular epithelial cells (TECs) demand high energy and rely on mitochondrial oxidative phosphorylation as the main energy source. However, this is disturbed in renal fibrosis. Acetylation is an important post-translational modification for Mitochondrial Metabolism. The mitochondrial protein NAD+-dependent deacetylase Sirtuin 3 (SIRT3) regulates mitochondrial metabolic function. Therefore, we aimed to identify the changes in the acetylome in tubules from fibrotic kidneys and determine their association with mitochondria. We found that decreased SIRT3 expression was accompanied by increased acetylation in mitochondria that have separated from TECs during the early phase of renal fibrosis. SIRT3 knockout mice were susceptible to hyper-acetylated mitochondrial proteins and to severe renal fibrosis. The activation of SIRT3 by honokiol ameliorated acetylation and prevented renal fibrosis. Analysis of the acetylome in separated tubules using LC-MS/MS showed that most kidney proteins were hyper-acetylated after unilateral ureteral obstruction. The increased acetylated proteins with 26.76% were mitochondrial proteins which were mapped to a broad range of mitochondrial pathways including fatty acid β-oxidation, the tricarboxylic acid cycle (TCA cycle), and oxidative phosphorylation. Pyruvate dehydrogenase E1α (PDHE1α), which is the primary link between glycolysis and the TCA cycle, was hyper-acetylated at lysine 385 in TECs after TGF-β1 stimulation and was regulated by SIRT3. Our findings showed that mitochondrial proteins involved in regulating energy metabolism were acetylated and targeted by SIRT3 in TECs. The deacetylation of PDHE1α by SIRT3 at lysine 385 plays a key role in metabolic reprogramming associated with renal fibrosis.

Figures
Products