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Age-dependent changes in the mitochondrial F0F1 ATP synthase
F Guerrieri1, G Capozza, M Kalous
1Institute of Medical Biochemistry and Chemistry and Centre for the Study of Mitochondria and Energy Metabolism, C.N.R., University of Bari, Italy.
Archives of Gerontology and Geriatrics
|May 1, 1992
Summary
Aging alters mitochondrial function in rat brain and heart. ATP hydrolase activity and proton conduction change with age, with mitochondrial protein content also varying in older rats.
Area of Science:
- Mitochondrial biochemistry and physiology
- Aging research
- Neuroscience and cardiovascular science
Background:
- Mitochondria are crucial for cellular energy production.
- Age-related changes in mitochondrial function can impact tissue health.
- ATP hydrolase activity and proton leak are key indicators of mitochondrial efficiency.
Purpose of the Study:
- To investigate the age-dependent changes in ATP hydrolase activity and passive proton conduction in rat brain and heart mitochondria.
- To correlate these functional changes with alterations in mitochondrial protein content.
Main Methods:
- Sonicated submitochondrial particles from rat brain and heart were used.
- ATP hydrolase activity was measured.
- Oligomycin-sensitive passive proton conduction was assessed.
- Immunoblot analysis was performed to quantify F(1) and F(0) mitochondrial components.
Main Results:
- ATP hydrolase activity (Vmax) increased from 3 to 6 months and decreased by 24 months.
- Oligomycin-sensitive proton conduction decreased from 3 to 6 months and increased by 24 months.
- Both F(1) and F(0) mitochondrial protein content varied with age, with F(1) showing more significant changes.
Conclusions:
- Mitochondrial ATP hydrolase activity and proton conduction exhibit distinct age-dependent patterns in rat brain and heart.
- These functional alterations are associated with changes in mitochondrial F(1) and F(0) content, suggesting a complex interplay during aging.