1. PTPRK regulates glycolysis and de novo lipogenesis to promote hepatocyte metabolic reprogramming in obesity
- Author
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Eduardo H. Gilglioni, Ao Li, Wadsen St-Pierre-Wijckmans, Tzu-Keng Shen, Israel Pérez-Chávez, Garnik Hovhannisyan, Michela Lisjak, Javier Negueruela, Valerie Vandenbempt, Julia Bauzá-Martinez, Jose M. Herranz, Daria Ezeriņa, Stéphane Demine, Zheng Feng, Thibaut Vignane, Lukas Otero Sanchez, Flavia Lambertucci, Alena Prašnická, Jacques Devière, David C. Hay, Jose A. Encinar, Sumeet Pal Singh, Joris Messens, Milos R. Filipovic, Hayley J. Sharpe, Eric Trépo, Wei Wu, and Esteban N. Gurzov
- Subjects
Science - Abstract
Abstract Fat accumulation, de novo lipogenesis, and glycolysis are key drivers of hepatocyte reprogramming and the consequent metabolic dysfunction-associated steatotic liver disease (MASLD). Here we report that obesity leads to dysregulated expression of hepatic protein-tyrosine phosphatases (PTPs). PTPRK was found to be increased in steatotic hepatocytes in both humans and mice, and correlates positively with PPARγ-induced lipogenic signaling. High-fat-fed PTPRK knockout male and female mice have lower weight gain and reduced hepatic fat accumulation. Phosphoproteomic analysis in primary hepatocytes and hepatic metabolomics identified fructose-1,6-bisphosphatase 1 and glycolysis as PTPRK targets in metabolic reprogramming. Mechanistically, PTPRK-induced glycolysis enhances PPARγ and lipogenesis in hepatocytes. Silencing PTPRK in liver cancer cell lines reduces colony-forming capacity and high-fat-fed PTPRK knockout mice exposed to a hepatic carcinogen develop smaller tumours. Our study defines the role of PTPRK in the regulation of hepatic glycolysis, lipid metabolism, and tumour development in obesity.
- Published
- 2024
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