Cellular Stress Causes Accumulation of the Glucose Transporter at the Surface of Cells Independently of their Insulin Sensitivity |
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Authors: | EV Sviderskaya E Jazrawi SA Baldwin CC Widnell CA Pasternak |
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Institution: | (1) Department of Cellular and Molecular Sciences, St. George's Hospital Medical School (University of London) London SW17 ORE, UK, GB;(2) Department of Biochemistry and Molecular Biology, University of Leeds, Leeds LS2 9JT, UK, GB;(3) Department of Cell Biology and Physiology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, US |
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Abstract: | The stimulation of glucose transport in response to various types of stress has been studied. There is no relationship between
effects of stress-inducing agents on glucose transport and their effects on cellular protein synthesis. Although the effect
of stress on glucose transport appears analogous to its stimulation by insulin, cells that are slightly insulin-sensitive
in terms of glucose transport (BHK cells) show a similar degree of stimulation as highly insulin-sensitive cells (differentiated
3T3-L1 cells). External labeling of the transporter protein with a photoactivatable derivative of mannose, 2-N-4-(1-azi-2,2,2-trifluoroethyl)
benzoyl-1, 3-bis-(D-mannos-4-yloxy)-propylamine, shows that most of the increased glucose transport activity correlates with
an increase in the amount of the transporter on the cell surface. Cells subjected to K+-depletion, which inhibits endocytosis and results in an accumulation of receptors at the cell surface, show the same increase
in glucose transport as cells exposed to stress; stressed cells show no further increase in glucose transport when subjected
to K+ depletion. These results support the view (Widnell, C.C., Baldwin, S.A., Davies, A., Martin, S., Pasternak, C.A. 1990. FASEB J
4:1634–1637) that cellular stress increases glucose transport by promoting the accumulation of glucose transporter molecules
at the cell surface.
Received: 20 June 1995/Revised: 29 September 1995 |
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Keywords: | : Cell surface — Glucose transporter — GLUT1 — GLUT4 — Insulin — Stress |
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