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B Signaling in Skeletal Muscle
1 Joslin Diabetes Center, Metabolism Section, Harvard Medical School, Boston, Massachusetts, United States
* To whom correspondence should be addressed. E-mail: laurie.goodyear{at}joslin.harvard.edu.
Mitogen activated protein kinases (MAPKs) and NF-
B are two major regulators of gene transcription and metabolism in response to oxidative, energetic, and mechanical stress in skeletal muscle. Chronic activation of these signaling pathways has been implicated in the development and perpetuation of various pathologies, such as diabetes and cachexia. However, both MAPK and NF-B are also stimulated by exercise, which promotes improvements in fuel homeostasis and can prevent skeletal muscle atrophy. This review will first discuss the major MAPK signaling modules in skeletal muscle, their differential activation by exercise, and speculated functions on acute substrate metabolism and exercise-induced gene expression. Focus will then shift to examination of the NF-B pathway, including its mechanism of activation by cellular stress and its putative mediation of exercise-stimulated adaptations in antioxidant status, tissue regeneration, and metabolism. Although limited, there is additional evidence to suggest cross-talk between MAPK and NF-B signals with exercise. The objectives herein are two-fold: 1) to determine how and why exercise activates MAPK and NF-B; and 2) to resolve their paradoxical activation during diseased and healthy conditions.
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