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Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Up-regulation of mitogen activated protein kinases in mdx skeletal muscle following chronic treadmill exercise.
Biochimica et Biophysica Acta 2005 June 11
Dystrophin, a product of the Duchenne muscular dystrophy gene, is a cytoskeletal protein of skeletal and cardiac muscle fibers. Dystrophin-deficient muscle fibers are abnormally vulnerable to mechanical stress including physical exercise, which is a powerful stimulator of mitogen-activated protein kinases (MAPKs). To examine how treadmill exercise affects MAPK family members in dystrophin-deficient skeletal muscle, we subjected both mdx mice, an animal model for Duchenne muscular dystrophy, and C57BL/10 mice to treadmill exercise and examined the phosphorylated protein levels of extracellular-signal regulated kinase (ERK1/2), p38 MAPK and c-Jun N terminal kinase 1 and 2 (JNK1 and JNK2) in the gastrocnemius muscle. Phosphorylation of ERK1/2, p38 MAPK and JNK2, but not JNK1, increased more in the muscles of exercise trained mdx mice than in muscles of trained C57BL/10 or untrained mdx mice. These results show that physical exercise aberrantly up-regulates the phosphorylated form of ERK1/2, p38 MAPK and JNK2 in dystrophin-deficient skeletal muscle and that their up-regulation might play a role in the degeneration and regeneration process of dystrophic features.
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