Transcriptional Repression of the Mouse Insulin-responsive Glucose Transporter (GLUT4) Gene by CAMP

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1991 Mar 1

PMID 1705711

Citations 21

Authors

K H Kaestner

J C McLenithan

M Janicot

M D Lane

Affiliations

Soon will be listed here.

Abstract

Glucose uptake by adipose tissue is mediated by two glucose transporters: GLUT4, which is most abundant, and GLUT1. While GLUT1 is expressed in many tissues, GLUT4 is unique to tissues that exhibit insulin-stimulated glucose uptake (heart and skeletal muscle and adipose tissue). In the diabetic state and during starvation, insulin-stimulated glucose uptake and GLUT4 expression are decreased in tissue adipocytes. Using 3T3-L1 adipocytes in culture, we investigated the possibility that these effects are mediated by elevated cellular cAMP. When 3T3-L1 adipocytes were treated for 16 hr with forskolin or 8-Br-cAMP, GLUT4 mRNA and protein were decreased by approximately 70%, while expression of GLUT1 mRNA and protein was increased 3-fold. These changes were accompanied by an increased basal rate of 2-deoxyglucose uptake and a loss of acute responsiveness of hexose uptake to insulin. The magnitude of GLUT4 mRNA depletion/GLUT1 mRNA accumulation was dependent upon the concentration of 8-Br-cAMP. The decrease of GLUT4 mRNA caused by 8-Br-cAMP was the result of a decreased transcription rate, while the half-life of the message was unaffected. The increase in GLUT1 mRNA caused by 8-Br-cAMP was the result of both transient transcriptional activation and mRNA stabilization. We suggest that down-regulation of GLUT4 mRNA in adipose tissue in the diabetic state and during starvation is the result of repression of transcription of the GLUT4 gene caused by cAMP.

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