A homoeostatic switch causing glycerol-3-phosphate and phosphoethanolamine accumulation triggers senescence by rewiring lipid metabolism - CRCL-Sénescence, cancer et vieillissement Access content directly
Journal Articles Nature Metabolism Year : 2024

A homoeostatic switch causing glycerol-3-phosphate and phosphoethanolamine accumulation triggers senescence by rewiring lipid metabolism

Khaled Tighanimine
  • Function : Author
  • PersonId : 1365193
Alexia Bankolé
Sophia Ladraa
David Bernard

Abstract

Cellular senescence affects many physiological and pathological processes and is characterized by durable cell cycle arrest, an inflammatory secretory phenotype and metabolic reprogramming. Here, by using dynamic transcriptome and metabolome profiling in human fibroblasts with different subtypes of senescence, we show that a homoeostatic switch that results in glycerol-3-phosphate (G3P) and phosphoethanolamine (pEtN) accumulation links lipid metabolism to the senescence gene expression programme. Mechanistically, p53-dependent glycerol kinase activation and post-translational inactivation of phosphate cytidylyltransferase 2, ethanolamine regulate this metabolic switch, which promotes triglyceride accumulation in lipid droplets and induces the senescence gene expression programme. Conversely, G3P phosphatase and ethanolamine-phosphate phospho-lyase-based scavenging of G3P and pEtN acts in a senomorphic way by reducing G3P and pEtN accumulation. Collectively, our study ties G3P and pEtN accumulation to controlling lipid droplet biogenesis and phospholipid flux in senescent cells, providing a potential therapeutic avenue for targeting senescence and related pathophysiology.
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hal-04511215 , version 1 (19-03-2024)

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Khaled Tighanimine, José Américo Nabuco Leva Ferreira Freitas, Ivan Nemazanyy, Alexia Bankolé, Delphine Benarroch-Popivker, et al.. A homoeostatic switch causing glycerol-3-phosphate and phosphoethanolamine accumulation triggers senescence by rewiring lipid metabolism. Nature Metabolism, 2024, 6 (2), pp.323-342. ⟨10.1038/s42255-023-00972-y⟩. ⟨hal-04511215⟩
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