Stimulation of GLUT-1 glucose transporter expression in response to exposure to calcium ionophore A-23187.

Stimulation of GLUT-1 glucose transporter expression in response to exposure to calcium ionophore A-23187.
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暴露于钙离子载体 A-23187 后刺激 GLUT-1 葡萄糖转运蛋白表达。

DOI:
10.1152/ajpcell.1995.269.5.c1228
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发表时间:
1995
期刊:
The American journal of physiology.
影响因子:
--
通讯作者:
Ismail-Beigi,F
Ismail-Beigi,F
中科院分区:
--
文献类型:
--
作者:
Mitani,Y;Behrooz,A;Dubyak,GR;Ismail-Beigi,F

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We tested the hypothesis that an increase in cytosolic calcium concentration stimulates glucose transporter isoform (GLUT-1) gene expression. Exposure of a rat liver cell line (Clone 9) to 3 microM A-23187 for 12 h resulted in 3-, 5-, and 10-fold increases in cytochalasin B-inhibitable 3-O-methyl-D-glucose transport, GLUT-1 protein, and GLUT-1 mRNA content, respectively. The induction of GLUT-1 mRNA in response to A-23187 is not preceded by a significant decrease in cell ATP content. This induction is prevented by 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid in conjunction with ethylene glycol-bis(beta-aminoethyl ether)-N,N, N',N'-tetraacetic acid. To investigate the mechanism of GLUT-1 mRNA induction, we found that exposure to A-23187 stabilized GLUT-1 mRNA: with the employment of actinomycin D, GLUT-1 mRNA had a half-life of 1.5 and 5.5 h in control and A-23187-treated cells, respectively. In nuclear run-on assays, the rate of GLUT-1 gene transcription was stimulated 1.5- to 1.7-fold in nuclei isolated from cells exposed to A-23187 for either 30 min or 2 h. These results demonstrate that exposure to A-23187 stimulates GLUT-1 gene expression and that the increase in GLUT-1 mRNA content is mediated in part by enhanced GLUT-1 gene transcription as well as decreased GLUT-1 mRNA degradation. The increase in GLUT-1 mRNA content, in turn, is associated with increased cell GLUT-1 content and enhanced glucose transport.
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