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Overview

  • Nobuharu L. FujiiEmail author
Chapter

Abstract

The skeletal muscle is the largest site for glucose metabolism in the human body. According to insulin-clamp measurements, the contribution by the skeletal muscle accounts for 70 % of the total glucose utilization rate, substantially exceeding the contribution by other organs such as the brain (~15 %) and adipose tissue (~5 %). Therefore, impaired glucose metabolism in the skeletal muscle greatly affects blood glucose control in the body. Glucose metabolism is an intracellular event. The extra- to intracellular passage of glucose is facilitated by glucose transporters (GLUTs). Glucose transporter 1 (GLUT1) and 4 (GLUT4) are expressed in the skeletal muscle. GLUT1 constitutively spans the cell membrane and takes up glucose into the skeletal cell in accordance with the glucose concentration gradient between the inside and outside of the cell. In contrast, GLUT4 is usually incorporated into small vesicles and localized in the cell and is translocated and incorporated into the cell membrane upon stimulation by insulin, which induces glucose uptake. Among multiple GLUTs, GLUT4 is the only isoform that is regulated by translocation, and its distribution is also limited to the skeletal muscle, heart, and adipose tissue. GLUT4 acts as a master regulator of glucose metabolism in response to changes in blood glucose. Several factors regulate GLUT4 expression and its translocation to, and retention in, the cell membrane. These factors include intracellular insulin signal transduction, insulin-independent glucose metabolism, and ectopic fat. A failure in any of these factors leads to the development of diabetic conditions in the body. Exercise and physical activity can coordinate these factors, acting favorably to turn the diabetic condition to a healthier state.

Keywords

Skeletal muscle Insulin Contraction Intracellular signal transduction Glucose uptake 

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Copyright information

© Springer Japan 2016

Authors and Affiliations

  1. 1.Department of Health Promotion Sciences, Graduate School of Human Health SciencesTokyo Metropolitan UniversityHachiojiJapan

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