GLUT3 is Present in Clone 9 Liver Cells and Translocates to the Plasma Membrane in Response to Insulin


Authors: Defries DM, Taylor CG, Zahradka P

Journal: Biochemical and Biophysical Research Communications

DOI: 10.1016/j.bbrc.2016.06.081.

Publication - Abstract

August 26, 2016

Abstract:

Clone 9 cells have been reported to express only the GLUT1 facilitative glucose transporter; however, previous studies have not examined Clone 9cells for GLUT3 content. The current study sought to profile the presence of glucose transporters in Clone 9 cells, H4IIE hepatoma cells, and L6 myoblasts and myotubes. While the other cell types contained the expected complement of transporters, Clone 9 cells had GLUT3 which was previously not reported. Interestingly, both GLUT3 mRNA and protein were detected in Clone 9 cells, but only mRNA for GLUT1 was detected. Glucose transport in Clone 9 cells was insulin-sensitive in a concentration-dependent manner, concomitant with the presence of GLUT3 in theplasma membrane after insulin treatment. Although basal glucose uptake was unaffected, insulin-stimulated glucose uptake was abolished with siRNA-mediated GLUT3 knockdown. These results contradict previous reports that Clone 9 cells exclusively express GLUT1 and suggest GLUT3is a key insulin-sensitive glucose transporter required for insulin-stimulated glucose uptake by Clone 9 cells.

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