en
Scientific article
English

Ready, set, internalize: mechanisms and regulation of GLUT4 endocytosis

Published inBioscience reports, vol. 29, no. 1, p. 1-11
Publication date2009
Abstract

The facilitative glucose transporter GLUT4, a recycling membrane protein, is required for dietary glucose uptake into muscle and fat cells. GLUT4 is also responsible for the increased glucose uptake by myofibres during muscle contraction. Defects in GLUT4 membrane traffic contribute to loss of insulin-stimulated glucose uptake in insulin resistance and Type 2 diabetes. Numerous studies have analysed the intracellular membrane compartments occupied by GLUT4 and the mechanisms by which insulin regulates GLUT4 exocytosis. However, until recently, GLUT4 internalization was less well understood. In the present paper, we review: (i) evidence supporting the co-existence of clathrin-dependent and independent GLUT4 internalization in adipocytes and muscle cells; (ii) the contrasting regulation of GLUT4 internalization by insulin in these cells; and (iii) evidence suggesting regulation of GLUT4 endocytosis in muscle cells by signals associated with muscle contraction.

Keywords
  • Adipocytes/cytology/metabolism
  • Animals
  • Clathrin/metabolism
  • *Endocytosis
  • Glucose Transporter Type 4/*metabolism
  • Humans
  • Insulin/metabolism
  • Muscle Cells/cytology/metabolism
Citation (ISO format)
ANTONESCU, Costin N. et al. Ready, set, internalize: mechanisms and regulation of GLUT4 endocytosis. In: Bioscience reports, 2009, vol. 29, n° 1, p. 1–11. doi: 10.1042/BSR20080105
Identifiers
ISSN of the journal0144-8463
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