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Stimulation of AMP-activated protein kinase (AMPK) is associated with enhancement of Glut1-mediated glucose transport.

Abstract：

:In cells expressing only the Glut1 isoform of glucose transporters, we have shown that glucose transport is markedly stimulated in response to hypoxia or inhibition of oxidative phosphorylation, conditions that would be expected to cause a stimulation of AMP-activated protein kinase (AMPK) activity. In the present study we tested the hypothesis that the stimulation of AMPK activity might be accompanied by an enhancement of Glut1-mediated glucose transport. Exposure of Clone 9 cells, 3T3-L1 preadipocytes, and C(2)C(12) myoblasts (cells that express only the Glut1 isoform) to 5-aminoimidazole-4-carboxamideribonucleoside (AICAR), an adenosine analog that stimulates AMPK activity, resulted in a marked increase in the rate of glucose transport (ranging from four- to sixfold) that was accompanied by activation of AMPK. This stimulation of AMPK activity was associated with an increase in the phosphorylation of threonine 172 on the activation loop of its alpha subunit, with the predominant change being in the alpha-2 isoform. Exposure of Clone 9 cells to 5-iodotubercidin, an inhibitor of adenosine kinase, abolished the accumulation of AICAR-5'-monophosphate (ZMP), stimulation of AMPK, and the enhancement of glucose transport in response to AICAR. There was no significant increase in the content of Glut1 in plasma membranes of Clone 9 cells exposed to AICAR. We conclude that stimulation of AMPK activity is associated with enhancement of Glut1-mediated glucose transport, and that the glucose transport response is mediated by activation of Glut1 transporters preexisting in the plasma membrane.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Abbud W,Habinowski S,Zhang JZ,Kendrew J,Elkairi FS,Kemp BE,Witters LA,Ismail-Beigi F

doi

10.1006/abbi.2000.1935

subject

Has Abstract

pub_date

2000-08-15 00:00:00

pages

347-52

issue

2

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(00)91935-0

journal_volume

380

pub_type

杂志文章

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