Journal
FASEB JOURNAL
Volume 16, Issue 11, Pages 1335-1347Publisher
WILEY
DOI: 10.1096/fj.01-0876rev
Keywords
cytokines; lipolysis; intracellular signaling; metabolism; calcium; glycogen; metabolic syndrome
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It has recently been demonstrated that the marked increase in the systemic concentration of cytokine interleukin-6 (IL-6) seen with exercise originates from the contracting limb and that skeletal muscle cells per se are the likely source of the production. This review summarizes the possible mechanisms for activation and biological consequences of muscle-derived IL-6. It appears that intramuscular IL-6 is stimulated by complex signaling cascades initiated by both calcium (Ca2+)-dependent and -independent stimuli. It also seems likely that skeletal muscle produces IL-6 to aid in maintaining metabolic homeostasis during periods of altered metabolic demand such as muscular exercise or insulin stimulation. It may do so via local and/or systemic effects. This review also explores the efficacy that IL-6 may be used as a therapeutic drug in treating metabolic disorders such as obesity, type 2 diabetes, and atherosclerosis. for activation and possible biological roles.
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