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Insulin-mediated cellular insulin resistance decreases osmotic shock-induced glucose transport in 3T3-L1 adipocytesJanež, Andrej, 1971- ; Worrall, Dorothy Sears ; Olefsky, Jerrold M.Similar to insulin, osmotic shock treatment of 3T3-L1 adipocytes causes translocation of GLUT4 protein to the plasma membrane and an increase in glucose transport activity. In our study, we evaluated ... the effect of chronic insulin treatment on the osmotic shock signaling pathway leading to GLUT4 translocation and glucose uptake. We found that chronic administration of insulin to the adipocytes induced cellular resistance to osmotic shock-stimulated GLUT4 translocation and glucose transport. We found that chronic insulin treatment attenuated shock-induced Gab-1 tyrosine phosphorylation. Furthermore, chronic insulin exposure led to a marked impairment in the ability of Gab-1 to associate with p85 subunit of PI 3-kinase in response to acute shock and insulin stimulation. Cells that were chronically treated with insulin showed a 70% and a 61% decrease in Gab-1 associated PI 3-kinase activity in shock- vs. insulin-treated cells, respectively. In addition, we found that chronic insulin treatment inhibited both insulin- and osmotic shock-induced membrane ruffling, indicating that twoPI 3-kinase dependent effects, GLUT4 translocation and membrane ruffling are decreased in chronically insulin-treated cells. The results described above clearly demonstrate that chronic insulin treatment induces a state of cellular resistance to osmotic shock signal transduction.Source: Endocrinology. - ISSN 0013-7227 (Letn. 141, št. 12, 2000, str. 4657-4663)Type of material - article, component partPublish date - 2000Language - englishCOBISS.SI-ID - 17421785
Author
Janež, Andrej, 1971- |
Worrall, Dorothy Sears |
Olefsky, Jerrold M.
Topics
Insulin Resistance |
Insulin |
Pharmacology |
Adipocytes |
Metabolism |
Monosaccharide Transport Proteins |
Metabolism |
Osmotic Pressure |
3t3 Cells |
Actins |
Ultrastructure |
Biological Transport |
Cell Membrane |
Ultrastructure |
Metabolism |
Enzyme Activation |
Glucose |
Metabolism |
Mice |
Phosphoproteins |
Metabolism |
Phosphorylation |
Phosphotyrosine |
Metabolism |
Signal Transduction |
Adipociti |
Insulinska rezistenca |
Inzulin |
Monosaharidni prenos, beljakovine |
Osmotski pritisk |
3T3 celice |
Aktini |
Biološki prenos |
Celična membrana |
Encimska aktivacija |
Fosfoproteini |
Fosforilacija |
Fosfotirozin |
Glukoza |
Miši |
Signal, prevajanje
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Janež, Andrej, 1971- | 18372 |
Worrall, Dorothy Sears | ![]() |
Olefsky, Jerrold M. | ![]() |
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