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|8||Effect of lifelong resveratrol supplementation and exercise training on skeletal muscle oxidative capacity in aging mice; impact of PGC-1alpha.|
Ringholm S; Olesen J; Pedersen JT; Brandt CT; Halling JF; Hellsten Y; Prats C; Pilegaard H
Exp Gerontol 2013; 48(11): 1311-8
PubMed ID: 23994519
BACKGROUND: The present study tested the hypothesis that lifelong resveratrol (RSV) supplementation counteracts an age-associated decrease in skeletal muscle oxidative capacity through peroxisome proliferator-activated receptor-gamma coactivator (PGC)-1alpha and that RSV combined with lifelong exercise training (EX) exerts additive effects through PGC-1alpha in mice. METHODS: 3 month old PGC-1alpha whole body knockout (KO) and wild type (WT) littermate mice were placed in cages with or without running wheel and fed either standard chow or standard chow with RSV supplementation (4 g/kg food) for 12 months. Young (3 months of age), sedentary mice on standard chow served as young controls. A graded running performance test and a glucose tolerance test were performed 2 and 1 week, respectively, before euthanization where quadriceps and extensor digitorum longus (EDL) muscles were removed. RESULTS: In PGC-1alpha KO mice, quadriceps citrate synthase (CS) activity, mitochondrial (mt)DNA content as well as pyruvate dehydrogenase (PDH)-E1alpha, cytochrome (Cyt) c and vascular endothelial growth factor (VEGF) protein content were 20-75% lower and, EDL capillary-to-fiber (C:F) ratio was 15-30% lower than in WT mice. RSV and/or EX had no effect on the C:F ratio in EDL. CS activity (P=0.063) and mtDNA content (P=0.013) decreased with age in WT mice, and CS activity, mtDNA content, PDH-E1alpha protein and VEGF protein increased ~1.5-1.8-fold with lifelong EX in WT, but not in PGC-1alpha KO mice, while RSV alone had no significant effect on these proteins. CONCLUSION: Lifelong EX increased activity/content of oxidative proteins, mtDNA and angiogenic proteins in skeletal muscle through PGC-1alpha, while RSV supplementation alone had no effect. Combining lifelong EX and RSV supplementation had no additional effect on skeletal muscle oxidative and angiogenic proteins. (c) 2013. Ringholm, Stine