ArticleFrontiers in cell and developmental biology2026
Sirt1 coordinates the mitochondrial UPR and myocellular proteostasis to preserve muscle integrity during muscle atrophy in zebrafish.
Article in Frontiers in cell and developmental biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: The decline of mitochondrial homeostasis and proteostasis, the two key cell quality control mechanisms, is the hallmark of aging and age-related diseases. One of the most notable examples is the age-related progressive loss of muscle mass, quality, and strength --a condition known as sarcopenia. In atrophic muscle, mitochondrial dysfunction and proteostasis impairment frequently occur together, indicating a potential association between the decline of mitochondrial homeostasis and proteostasis. However, the mechanism by which these two modes of cell quality control are coordinated remains poorly understood. Methods: We employed dexamethasone-induced muscle atrophy models in both larval and adult zebrafish to investigate the role of cell stress responses in muscle maintenance. Mitochondrial stress was assessed by measuring the mitochondrial unfolded protein response (UPR Results: Inhibition of Sirt1 markedly exacerbated muscle deterioration and proteostasis impairment under dexamethasone-induced muscle atrophy in zebrafish. Mechanistically, Sirt1 is required for activation of the UPR Discussion: We have demonstrated that muscle atrophic stress induced by dexamethasone treatment activates the UPR
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