Age-Associated Loss of OPA1 in Muscle Impacts Muscle Mass, Metabolic Homeostasis, Systemic Inflammation, and Epithelial Senescence.

Cell Metab

Venetian Institute of Molecular Medicine, via Orus 2, 35129 Padova, Italy; Department of Biomedical Science, University of Padova, via G. Colombo 3, 35100 Padova, Italy; Department of Medicine, McGill University, Montreal, QC H4A 3J1, Canada. Electronic address:

Published: June 2017

Mitochondrial dysfunction occurs during aging, but its impact on tissue senescence is unknown. Here, we find that sedentary but not active humans display an age-related decline in the mitochondrial protein, optic atrophy 1 (OPA1), that is associated with muscle loss. In adult mice, acute, muscle-specific deletion of Opa1 induces a precocious senescence phenotype and premature death. Conditional and inducible Opa1 deletion alters mitochondrial morphology and function but not DNA content. Mechanistically, the ablation of Opa1 leads to ER stress, which signals via the unfolded protein response (UPR) and FoxOs, inducing a catabolic program of muscle loss and systemic aging. Pharmacological inhibition of ER stress or muscle-specific deletion of FGF21 compensates for the loss of Opa1, restoring a normal metabolic state and preventing muscle atrophy and premature death. Thus, mitochondrial dysfunction in the muscle can trigger a cascade of signaling initiated at the ER that systemically affects general metabolism and aging.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5462533PMC
http://dx.doi.org/10.1016/j.cmet.2017.04.021DOI Listing

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