Journal
CURRENT OPINION IN CELL BIOLOGY
Volume 22, Issue 4, Pages 506-512Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/j.ceb.2010.03.012
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Funding
- NIDDK NIH HHS [R01 DK075772-02, R01 DK075772-03, R01 DK052057-11A2, R01 DK075772, R01 DK052057, R01 DK075772-01A1] Funding Source: Medline
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Insulin regulates the trafficking of GLUT4 glucose transporters in fat and muscle cells. In unstimulated cells, GLUT4 is sequestered intracellularly in small, insulin-responsive vesicles. Insulin stimulates the translocation of these vesicles to the cell surface, inserting the transporters into the plasma membrane to enhance glucose uptake. Formation of the insulin-responsive vesicles requires multiple interactions among GLUT4, IRAP, LRP1, and sortilin, as well as recruitment of GGA and ACAP1 adaptors and clathrin. Once formed, the vesicles are retained within unstimulated cells by the action of TUG, Ubc9, and other proteins. In addition to acting at other steps in vesicle recycling, insulin releases this retention mechanism to promote the translocation and fusion of the vesicles at the cell surface.
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