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. 1989 Oct;86(20):7761–7765. doi: 10.1073/pnas.86.20.7761

Differential regulation of two distinct glucose transporter species expressed in 3T3-L1 adipocytes: effect of chronic insulin and tolbutamide treatment.

K M Tordjman 1, K A Leingang 1, D E James 1, M M Mueckler 1
PMCID: PMC298150  PMID: 2682625

Abstract

The HepG2-type glucose transporter (HepG2-GT) is expressed in 3T3-L1 fibroblasts and adipocytes. In contrast, the acutely insulin-regulatable glucose transporter (IRGT) is expressed only in the adipocytes. In the present study, the expression of the IRGT was shown to increase in parallel with the acquisition of acutely insulin-stimulated glucose uptake during differentiation of these cells, whereas the level of the HepG2-GT decreased during the course of differentiation in parallel with a decline in basal glucose uptake. We examined the effects of chronic insulin and tolbutamide treatment on glucose transporter activity in conjunction with the expression of these two glucose transporter species in 3T3-L1 adipocytes. Treatment of adipocytes with insulin, tolbutamide, or both agents in combination increased 2-deoxyglucose uptake, HepG2-GT protein, and HepG2-GT mRNA levels in parallel. The effect of combined insulin/tolbutamide administration on these three parameters was greater than the effect of either treatment alone. In contrast, these treatments either had no significant effect or decreased levels of IRGT protein and mRNA. We conclude that chronic treatment of 3T3-L1 adipocytes with insulin or tolbutamide increases glucose uptake primarily by means of a selective increase in the expression of the HepG2-GT. We suggest that part of the in vivo hypoglycemic effect of insulin and sulfonylureas may involve an increased expression of the HepG2-GT.

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