Hypertonic external medium represses cellular respiration and promotes Warburg/Crabtree effect - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement
Article Dans Une Revue FASEB Journal Année : 2020

Hypertonic external medium represses cellular respiration and promotes Warburg/Crabtree effect

Résumé

Hyperosmotic conditions are associated to several pathological states. In this article, we evaluate the consequence of hyperosmotic medium on cellular energy metabolism. We demonstrate that exposure of cells to hyperosmotic conditions immediately reduces the mitochondrial oxidative phosphorylation rate. This causes an increase in glycolysis, which represses further respiration. This is known as the Warburg or Crabtree effect. In addition to aerobic glycolysis, we observed two other cellular responses that would help to preserve cellular ATP level and viability: A reduction in the cellular ATP turnover rate and a partial mitochondrial uncoupling which is expected to enhance ATP production by Krebs cycle. The latter is likely to constitute another metabolic adaptation to compensate for deficient oxidative phosphorylation that, importantly, is not dependent on glucose.
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Dates et versions

hal-02985595 , version 1 (02-11-2020)

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Minoo Hamraz, Raymond Abolhassani, Mireille Andriamihaja, Céline Ransy, Véronique Lenoir, et al.. Hypertonic external medium represses cellular respiration and promotes Warburg/Crabtree effect. FASEB Journal, 2020, 34 (1), pp.222-236. ⟨10.1096/fj.201900706RR⟩. ⟨hal-02985595⟩
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