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pubmed-article:2104834pubmed:abstractTextThe purpose of this study was to simultaneously isolate skeletal muscle plasma and microsomal membranes from the hind limbs of male Sprague-Dawley rats perfused either in the absence or presence of 20 milliunits/ml insulin and to determine the effect of insulin on the number and distribution of glucose transporters in these membrane fractions. Insulin increased hind limb glucose uptake greater than 3-fold (2.4 +/- 0.7 versus 9.2 +/- 1.0 mumol/g x h, p less than 0.001). Plasma membrane glucose transporter number, measured by cytochalasin B binding, increased 2-fold (9.1 +/- 1.0 to 20.4 +/- 3.1 pmol/mg protein, p less than 0.005) in insulin-stimulated muscle while microsomal membrane transporters decreased significantly (14.8 +/- 1.6 to 9.8 +/- 1.4 pmol/mg protein, p less than 0.05). No change in the dissociation constant (Kd approximately 120 nm) was observed. K+-stimulated-p-nitrophenol phosphatase, 5'-nucleotidase, and galactosyltransferase specific activity, enrichment, and recovery in the plasma and microsomal membrane fractions were not altered by insulin treatment. Western blot analysis using the monoclonal antibody mAb 1F8 (specific for the insulin-regulatable glucose transporter) demonstrated increased glucose transporter densities in plasma membranes from insulin-treated hind limb skeletal muscle compared with untreated tissues, while microsomal membranes from the insulin-treated hind limb skeletal muscle had a concomitant decrease in transporter density. We conclude that the increase in plasma membrane glucose transporters explains, at least in part, the increase in glucose uptake associated with insulin stimulation of hind limb skeletal muscle. Our data further suggest that these recruited transporters originate from an intracellular microsomal pool, consistent with the translocation hypothesis.lld:pubmed
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pubmed-article:2104834pubmed:articleTitleIdentification of an intracellular pool of glucose transporters from basal and insulin-stimulated rat skeletal muscle.lld:pubmed
pubmed-article:2104834pubmed:affiliationDepartment of Medicine, University of Vermont College of Medicine, Burlington 05405.lld:pubmed
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