| First Author | Sahu A | Year | 2018 |
| Journal | Nat Commun | Volume | 9 |
| Issue | 1 | Pages | 4859 |
| PubMed ID | 30451844 | Mgi Jnum | J:268567 |
| Mgi Id | MGI:6267984 | Doi | 10.1038/s41467-018-07253-3 |
| Citation | Sahu A, et al. (2018) Age-related declines in alpha-Klotho drive progenitor cell mitochondrial dysfunction and impaired muscle regeneration. Nat Commun 9(1):4859 |
| abstractText | While young muscle is capable of restoring the original architecture of damaged myofibers, aged muscle displays a markedly reduced regeneration. We show that expression of the "anti-aging" protein, alpha-Klotho, is up-regulated within young injured muscle as a result of transient Klotho promoter demethylation. However, epigenetic control of the Klotho promoter is lost with aging. Genetic inhibition of alpha-Klotho in vivo disrupted muscle progenitor cell (MPC) lineage progression and impaired myofiber regeneration, revealing a critical role for alpha-Klotho in the regenerative cascade. Genetic silencing of Klotho in young MPCs drove mitochondrial DNA (mtDNA) damage and decreased cellular bioenergetics. Conversely, supplementation with alpha-Klotho restored mtDNA integrity and bioenergetics of aged MPCs to youthful levels in vitro and enhanced functional regeneration of aged muscle in vivo in a temporally-dependent manner. These studies identify a role for alpha-Klotho in the regulation of MPC mitochondrial function and implicate alpha-Klotho declines as a driver of impaired muscle regeneration with age. |
