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INVITED REVIEW

HIGHLIGHTED TOPIC
Free Radical Biology in Skeletal Muscle

Modulation of glucose transport in skeletal muscle by reactive oxygen species

Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden

Glucose transport is an essential physiological process that is characteristic of all eukaryotic cells, including skeletal muscle. In skeletal muscle, glucose transport is mediated by the GLUT-4 protein under conditions of increased carbohydrate utilization. The three major physiological stimuli of glucose transport in muscle are insulin, exercise/contraction, and hypoxia. Here, the role of reactive oxygen species (ROS) in modulating glucose transport in skeletal muscle is reviewed. Convincing evidence for ROS involvement in insulin- and hypoxia-mediated transport in muscle is lacking. Recent experiments, based on pharmacological and genetic approaches, support a role for ROS in contraction-mediated glucose transport. During contraction, endogenously produced ROS appear to mediate their effects on glucose transport via AMP-activated protein kinase.

exercise; adenosine 5'-monophosphate-activated protein kinase

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