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Publication : Proteolytic rewiring of mitochondria by LONP1 directs cell identity switching of adipocytes.

First Author  Fu T Year  2023
Journal  Nat Cell Biol Volume  25
Issue  6 Pages  848-864
PubMed ID  37217599 Mgi Jnum  J:353633
Mgi Id  MGI:7520967 Doi  10.1038/s41556-023-01155-3
Citation  Fu T, et al. (2023) Proteolytic rewiring of mitochondria by LONP1 directs cell identity switching of adipocytes. Nat Cell Biol 25(6):848-864
abstractText  Mitochondrial proteases are emerging as key regulators of mitochondrial plasticity and acting as both protein quality surveillance and regulatory enzymes by performing highly regulated proteolytic reactions. However, it remains unclear whether the regulated mitochondrial proteolysis is mechanistically linked to cell identity switching. Here we report that cold-responsive mitochondrial proteolysis is a prerequisite for white-to-beige adipocyte cell fate programming during adipocyte thermogenic remodelling. Thermogenic stimulation selectively promotes mitochondrial proteostasis in mature white adipocytes via the mitochondrial protease LONP1. Disruption of LONP1-dependent proteolysis substantially impairs cold- or beta(3) adrenergic agonist-induced white-to-beige identity switching of mature adipocytes. Mechanistically, LONP1 selectively degrades succinate dehydrogenase complex iron sulfur subunit B and ensures adequate intracellular succinate levels. This alters the histone methylation status on thermogenic genes and thereby enables adipocyte cell fate programming. Finally, augmented LONP1 expression raises succinate levels and corrects ageing-related impairments in white-to-beige adipocyte conversion and adipocyte thermogenic capacity. Together, these findings reveal that LONP1 links proteolytic surveillance to mitochondrial metabolic rewiring and directs cell identity conversion during adipocyte thermogenic remodelling.
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