6533b862fe1ef96bd12c6359
RESEARCH PRODUCT
Mitochondria as sources and targets of damage in cellular aging.
Rebeca Garcia-vallesJose ViñaJuan GambiniConsuelo BorrásMa Carmen Gómez-cabreraHelios Pareja-galeanoFabian Sanchis-gomarsubject
Mitochondrial DNAFree RadicalsDNA damageBiochemistry (medical)Clinical BiochemistryGeneral MedicineMitochondrionBiologyMitochondrial Sizemedicine.disease_causeAntioxidantsCell biologyMitochondriaOxidative StressMitochondrial biogenesisApoptosismedicineAnimalsHumansOxidative stressCellular SenescenceFree-radical theory of agingDNA Damagedescription
Mitochondria are considered as the most important cellular sources and targets of free radicals. They are also a source of signalling molecules that regulate cell cycle, proliferation, and apoptosis. Denham Harman postulated the free radical theory of aging in 1956. Previously Rebecca Gershman showed that radiation toxicity could be attributed to free radical damage. Subsequently, Jaime Miquel formulated the mitochondrial free radical theory of aging. We have shown that mitochondrial size, membrane potential, inner membrane mass and peroxide production is altered inside cells in old animals. These result in an increase in the oxidative damage to mitochondrial DNA with aging that can be prevented by antioxidant supplementation. Aging is also associated with a lower renewal of mitochondria. This is mainly due to the lack of reactivity of proliferator-activated receptor-γ (PPAR-γ) coactivator 1α (PGC-1α) in old animals. PGC-1α acts as a master regulator of energy metabolism and mitochondrial biogenesis and recent evidence shows that it interacts with p53 and telomerase. The promotion of mitochondriogenesis is critical to prevent aging. In skeletal muscle it has relevance to prevent sarcopenia and frailty.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-10-30 | Clinical chemistry and laboratory medicine |