Proline biosynthesis is a vent for TGFβ-induced mitochondrial redox stress.

The EMBO Journal
Simon SchwörerCraig B Thompson

Abstract

The production and secretion of matrix proteins upon stimulation of fibroblasts by transforming growth factor-beta (TGFβ) play a critical role in wound healing. How TGFβ supports the bioenergetic cost of matrix protein synthesis is not fully understood. Here, we show that TGFβ promotes protein translation at least in part by increasing the mitochondrial oxidation of glucose and glutamine carbons to support the bioenergetic demand of translation. Surprisingly, we found that in addition to stimulating the entry of glucose and glutamine carbon into the TCA cycle, TGFβ induced the biosynthesis of proline from glutamine in a Smad4-dependent fashion. Metabolic manipulations that increased mitochondrial redox generation promoted proline biosynthesis, while reducing mitochondrial redox potential and/or ATP synthesis impaired proline biosynthesis. Thus, proline biosynthesis acts as a redox vent, preventing the TGFβ-induced increase in mitochondrial glucose and glutamine catabolism from generating damaging reactive oxygen species (ROS) when TCA cycle activity exceeds the ability of oxidative phosphorylation to convert mitochondrial redox potential into ATP. In turn, the enhanced synthesis of proline supports TGFβ-induced production of ma...Continue Reading

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Citations

Jun 6, 2020·Frontiers in Oncology·Cristina D'AnielloGabriella Minchiotti
Sep 29, 2020·Expert Review of Respiratory Medicine·Dingyuan JiangGang Liu
Apr 25, 2020·International Journal of Molecular Sciences·Yunuen Ortiz-PedrazaMarcela Lizano
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Feb 16, 2021·Frontiers in Molecular Biosciences·Shiv BharadwajSang Gu Kang
Jan 18, 2021·The Journal of Biological Chemistry·Emily M ChristensenJohn J Tanner
Mar 19, 2021·Genetics·Morgane G StumRobert W Burgess
Apr 24, 2021·Science·Jiajun ZhuCraig B Thompson
Jul 18, 2021·Nature Reviews. Cancer·Inmaculada Martínez-Reyes, Navdeep S Chandel
Jul 18, 2021·Amino Acids·Yutong LiJianyuan Luo
Apr 13, 2021·American Journal of Respiratory Cell and Molecular Biology·SeungHye Han, Navdeep S Chandel
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Aug 1, 2021·Journal of Experimental Botany·Yao ZhengArnould Savouré

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