Calorie Restriction Rescues Mitochondrial Dysfunction in Adck2-Deficient Skeletal Muscle

Area of Science:

• Mitochondrial biology
• Metabolic disorders
• Aging research

Background:

• ADCK2 haploinsufficiency causes mitochondrial myopathy, impacting fatty acid beta-oxidation, metabolism, and physical performance.
• Calorie restriction (CR) is known to extend lifespan and mitigate age-related diseases.

Purpose of the Study:

• To investigate the therapeutic potential of CR in mitigating the effects of ADCK2 haploinsufficiency in skeletal muscle.
• To assess the impact of CR on metabolic profiles, mitochondrial function, and physical performance in a mouse model.

Main Methods:

• Heterozygous Adck2 knockout mice were subjected to 40% CR for 7 months.
• Analysis included glucose and fatty acid metabolism, mitochondrial function (CoQ levels, OCR, mitochondrial mass), muscle fiber type, and satellite cell differentiation.
• Physical performance was evaluated using strength tests and running wheel activity.

Main Results:

• CR restored glucose and fatty acid metabolism in mutant mice to wild-type (WT) levels.
• CR increased CoQ levels, oxygen consumption rate (OCR), and mitochondrial mass in skeletal muscle.
• CR improved muscle fiber type distribution, enhanced satellite cell differentiation and respiration, and boosted physical activity.

Conclusions:

• Calorie restriction effectively reverses defective aerobic metabolism and skeletal muscle differentiation caused by ADCK2 haploinsufficiency.
• CR intervention offers a promising strategy to counteract age-associated physical and metabolic decline in mitochondrial myopathies.