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Minireview: Recent Developments in the Regulation of Glucose Transporter-4 Traffic: New Signals, Locations, and Partners

Programme in Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada M5G 1X8

Address all correspondence and requests for reprints to: Amira Klip, Programme in Cell Biology, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8. E-mail: amira{at}sickkids.ca.

Glucose transporter (GLUT) 4 is the major glucose transporter of muscle and adipose cells, exquisitely regulated by insulin through posttranslational events. Twenty years after the seminal observations that GLUT4 levels rapidly rise at the plasma membrane (PM) and drop in endomembranes in response to an acute insulin challenge, we are still mapping the intracellular traffic of the transporter and the regulatory events that insulin unleashes. Newly synthesized GLUT4 enters an insulin-responsive compartment aided by GGA2 (an Arf-binding protein). In cultured adipocytes and myocytes, GLUT4 concentrates in a perinuclear pole through participation of microtubules and the EHD1 Eps15 homology domain-containing protein 1. In the absence of stimuli, GLUT4 distributes between recycling endosomes and the insulin-responsive compartment. A handful of proteins that bind to GLUT4 appear to regulate its half-life (e.g. Ubc9) and tethering within endomembranes (e.g. TUG). Insulin-derived signals promote not only GLUT4 mobilization toward the PM but also its traffic between endosomal compartments and internalization from the PM. Class IA phosphatidylinositol (PI) 3-kinase plays a pivotal role at several steps of GLUT4 mobilization. The PI 3-kinase atypical PKC and Akt/PKB AS160 signaling cascades are major regulators of GLUT4 exocytosis aided by small GTPases. At the cell periphery, GLUT4-containing vesicles tether, dock, and fuse with the PM assisted by the exocyst complex followed by engagement of a soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) complex [with vesicle-associated membrane protein (VAMP)2 as the vesicular (v)-SNARE and soluble NSF-attachment protein (SNAP)23 and syntaxin4 as target (t)-SNAREs] regulated by the accessory proteins Munc18c, Synip and Tomosyn. Vesicle tethering and fusion are regulated by insulin through input from class IA PI 3-kinase.

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