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pubmed-article:8954915pubmed:abstractTextThe signal transduction pathway by which insulin stimulates glucose transport is largely unknown, but a role of PI-3-kinase and small GTP-binding proteins has been proposed. In previous studies we, among many others, excluded a role for the ras/MAP kinase pathway in insulin-mediated glucose transport. In this study we examined a possible role of the small GTP-binding protein rho in this process. Pretreatment of 3T3-L1 adipocytes with botulinum C3 exoenzyme (C3), which is known to ADP-ribosylate and inactivate rho, potently stimulated glucose uptake to a level similar to insulin. Interestingly, glycogen synthesis was not affected by C3 treatment. Insulin stimulates glucose uptake by triggering the translocation of GLUT4, the insulin-sensitive glucose transporter isotype, from an intracellular compartment to the plasma membrane. Similarly, C3-induced glucose uptake was paralleled by GLUT4 translocation. These data point to an important and novel role of the target of C3 (likely rho) in the regulation of GLUT4-mediated glucose transport. Our data suggest that insulin might stimulate glucose uptake through inactivation of rho.lld:pubmed
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pubmed-article:8954915pubmed:articleTitleClostridium botulinum C3 exoenzyme stimulates GLUT4-mediated glucose transport, but not glycogen synthesis, in 3T3-L1 adipocytes--a potential role of rho?lld:pubmed
pubmed-article:8954915pubmed:affiliationDepartment of Endocrinology, University Hospital Leiden, The Netherlands. van-den-berghe@mpi-dortmund.mpg.delld:pubmed
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pubmed-article:8954915pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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