Journal of Applied Physiology AJP: Lung Cellular and Molecular Physiology
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J Appl Physiol 107: 1006-1014, 2009. First published August 20, 2009; doi:10.1152/japplphysiol.00734.2009
8750-7587/09 $8.00
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REVIEW

Edward F. Adolph Distinguished Lecture: Muscle as an endocrine organ: IL-6 and other myokines

Bente K. Pedersen

The Centre of Inflammation and Metabolism at the Department of Infectious Diseases, and Copenhagen Muscle Research Centre, Rigshospitalet, the Faculty of Health Sciences, University of Copenhagen, Denmark

Submitted 8 July 2009 ; accepted in final form 17 August 2009

Skeletal muscle is an endocrine organ that produces and releases myokines in response to contraction. Some myokines are likely to work in a hormone-like fashion, exerting specific endocrine effects on other organs such as the liver, the brain, and the fat. Other myokines will work locally via paracrine mechanisms, exerting, e.g., angiogenetic effects, whereas yet other myokines work via autocrine mechanisms and influence signaling pathways involved in fat oxidation and glucose uptake. The finding that muscles produce and release myokines creates a paradigm shift and opens new scientific, technological, and scholarly horizons. This finding represents a breakthrough within integrative physiology and contributes to our understanding of why regular exercise protects against a wide range of chronic diseases. Thus the myokine field provides a conceptual basis for the molecular mechanisms underlying, e.g., muscle-fat, muscle-liver, muscle-pancreas, and muscle-brain cross talk.

adipose tissue; cytokines; insulin resistance; skeletal muscle


Address for reprint requests and other correspondence: B. K. Pedersen, Centre of Inflammation and Metabolism, Rigshospitalet, Section 7641, Blegdamsvej 9, DK-2100, Copenhagen, Denmark (e-mail: bkp{at}rh.dk).






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