PGC-1α (Peroxisome proliferator-activated receptor gamma coactivator 1-alpha)

PGC-1α is the master switch for building new mitochondria, your cells' power plants. It is a 'co-activator', meaning it cannot grab DNA itself; instead it teams up with other proteins to turn genes on. Its partners include nuclear receptors (PPARα, ERRα) and transcription factors (NRF1, NRF2, TFAM). One quick clarification: these nuclear respiratory factors NRF1 and NRF2 are different from the antioxidant factor Nrf2/NFE2L2 in the NRF2/KEAP1 entry. PGC-1α gets switched on by exercise, cold, fasting, and by AMPK or SIRT1 activity. Once active, it drives the machinery that copies the mitochondrial genome and the enzymes that burn fat and run the TCA cycle. Its level and activity fall in aged muscle and heart, which feeds failing mitochondria and metabolic inflexibility. In several animal models, boosting it extends healthspan and delays age-related muscle loss, which makes it a prominent target in longevity drug research.

Last reviewed: June 22, 2026

This definition is educational and is not medical advice, a diagnosis, or treatment. Talk to a doctor about any health decisions. Read our full medical disclaimer