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- Title
Age-Dependent Changes in the Production of Mitochondrial Reactive Oxygen Species in Human Skeletal Muscle.
- Authors
Vyssokikh, Mikhail Yu.; Vigovskiy, Maksim A.; Philippov, Vladislav V.; Boroday, Yakov R.; Marey, Mariya V.; Grigorieva, Olga A.; Vepkhvadze, Tatiana F.; Kurochkina, Nadezhda S.; Manukhova, Ludmila A.; Efimenko, Anastasiya Yu.; Popov, Daniil V.; Skulachev, Vladimir P.
- Abstract
A decrease in muscle mass and its functionality (strength, endurance, and insulin sensitivity) is one of the integral signs of aging. One of the triggers of aging is an increase in the production of mitochondrial reactive oxygen species. Our study was the first to examine age-dependent changes in the production of mitochondrial reactive oxygen species related to a decrease in the proportion of mitochondria-associated hexokinase-2 in human skeletal muscle. For this purpose, a biopsy was taken from m. vastus lateralis in 10 young healthy volunteers and 70 patients (26-85 years old) with long-term primary arthrosis of the knee/hip joint. It turned out that aging (comparing different groups of patients), in contrast to inactivity/chronic inflammation (comparing young healthy people and young patients), causes a pronounced increase in peroxide production by isolated mitochondria. This correlated with the age-dependent distribution of hexokinase-2 between mitochondrial and cytosolic fractions, a decrease in the rate of coupled respiration of isolated mitochondria and respiration when stimulated with glucose (a hexokinase substrate). It is discussed that these changes may be caused by an age-dependent decrease in the content of cardiolipin, a potential regulator of the mitochondrial microcompartment containing hexokinase. The results obtained contribute to a deeper understanding of age-related pathogenetic processes in skeletal muscles and open prospects for the search for pharmacological/physiological approaches to the correction of these pathologies.
- Subjects
REACTIVE oxygen species; SKELETAL muscle; OXYGEN consumption; MITOCHONDRIA; RESPIRATION; MUSCLE mass; VASTUS lateralis; HIP joint
- Publication
Biochemistry (00062979), 2024, Vol 89, Issue 2, p299
- ISSN
0006-2979
- Publication type
Article
- DOI
10.1134/S0006297924020093