Endurance capacity in maturing mdx mice is markedly enhanced by combined voluntary wheel running and green tea extract.
Duchenne muscular dystrophy is characterized by the absence of dystrophin from muscle cells. Dystrophic muscle cells are susceptible to oxidative stress. We tested the hypothesis that 3 wk of endurance exercise starting at age 21 days in young male mdx mice would blunt oxidative stress and improve dystrophic skeletal muscle function, and these effects would be enhanced by the antioxidant green tea extract (GTE). In mice fed normal diet, average daily running distance increased 300% from week 1 to week 3, and total distance over 3 wk was improved by 128% in mice fed GTE. Running, independent of diet, increased serum antioxidant capacity, extensor digitorum longus tetanic stress, and total contractile protein content, heart citrate synthase, and heart and quadriceps beta-hydroxyacyl-CoA dehydrogenase activities. GTE, independent of running, decreased serum creatine kinase and heart and gastrocnemius lipid peroxidation and increased gastrocnemius citrate synthase activity. These data suggest that both endurance exercise and GTE may be beneficial as therapeutic strategies to improve muscle function in mdx mice.
Call
Jarrod A
JA
Department of Human Nutrition, Virginia Polytechnic Institute, Blacksburg, Virginia. callx017@umn.edu
Voelker
Kevin A
KA
Wolff
Andrew V
AV
McMillan
Ryan P
RP
Evans
Nick P
NP
Hulver
Matthew W
MW
Talmadge
Robert J
RJ
Grange
Robert W
RW
D015094:3-Hydroxyacyl CoA Dehydrogenases / Q000378:metabolism; D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D015415:Biomarkers / Q000378:metabolism; D028241:Camellia sinensis; D002950:Citrate (si)-Synthase / Q000378:metabolism; D003131:Combined Modality Therapy; D003402:Creatine Kinase / Q000097:blood; D004195:Disease Models, Animal; D005081:Exercise Therapy; D017079:Exercise Tolerance / Q000187:drug effects*; D015227:Lipid Peroxidation / Q000187:drug effects; D008297:Male; D051379:Mice; D018101:Mice, Inbred mdx; D009119:Muscle Contraction / Q000187:drug effects; D018485:Muscle Fibers, Skeletal / Q000187:drug effects / Q000378:metabolism; D009124:Muscle Proteins / Q000378:metabolism; D018482:Muscle, Skeletal / Q000187:drug effects* / Q000378:metabolism / Q000503:physiopathology; D020388:Muscular Dystrophy, Duchenne / Q000378:metabolism / Q000503:physiopathology / Q000628:therapy*; D009206:Myocardium / Q000201:enzymology; D018384:Oxidative Stress / Q000187:drug effects*; D005082:Physical Exertion; D010936:Plant Extracts / Q000494:pharmacology; D013997:Time Factors
D000975:Antioxidants; D015415:Biomarkers; D009124:Muscle Proteins; D010936:Plant Extracts; D015094:3-Hydroxyacyl CoA Dehydrogenases; D002950:Citrate (si)-Synthase; D003402:Creatine Kinase