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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Mueckler, M. M. James, D. E. Tordjman, K. M. Leingang, K. A. |
| Description | Author Affiliation: Tordjman KM ( Departments of Pediatrics and Internal Medicine, Washington University School of Medicine, Saint Louis, MO 63110.); |
| 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. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 20 |
| Volume Number | 86 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1989-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Adipose Tissue Metabolism Gene Expression Regulation Drug Effects Genes Insulin Pharmacology Monosaccharide Transport Proteins Biosynthesis Tolbutamide Animals Cell Differentiation Cells, Cultured Deoxyglucose Kinetics Mice Genetics RNA, Messenger Isolation & Purification Transcription, Genetic Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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