SUMMARY
Cellular senescence and organismal aging predispose age-related chronic diseases such as neurodegenerative, metabolic and cardiovascular disorders. These diseases emerge coincidently from elevated oxidative/electrophilic stress, inflammation, mitochondrial dysfunction, DNA damage and telomere dysfunction and shortening. Mechanistic linkages are incompletely understood. Herein, we show that ablation of peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α) accelerates vascular aging and atherosclerosis coinciding with telomere dysfunction and shortening and DNA damage. PGC-1α deletion reduces expression and activity of telomerase reverse transcriptase (TERT), and increases p53 levels. Ectopic expression of PGC-1α coactivates TERT transcription, and reverses telomere malfunction and DNA damage. Furthermore, alpha lipoic acid (ALA), a non-dispensable mitochondrial cofactor, up-regulates PGC-1α-dependent TERT and the cytoprotective Nrf-2-mediated antioxidant/electrophile-responsive element (ARE/ERE) signaling cascades, and counteracts high-fat diet-induced, age-dependent arteriopathy. These results illustrate the pivotal importance of PGC-1α in ameliorating senescence, aging and associated chronic diseases, and may inform novel therapeutic approaches involving electrophilic specificity.