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- W2003476427 abstract "Defects in glucose uptake are among the primary defects associated with peripheral insulin resistance, but fundamental mechanisms leading to this state are poorly understood. In order to elucidate mechanisms leading toward defects in glucose transport, we have used a partially pancreatectomized infusion (PxI) animal model with infusions of saline, glucose, or insulin to examine individual and combined effects of hyperglycemia and hyperinsulinemia on skeletal muscle glucose utilization. Moderate hyperglycemia induced by pancreatectomy reduced basal hindlimb muscle glucose utilization by 57% without affecting maximal insulin-stimulated glucose utilization; insulin administered in an amount sufficient to correct this hyperglycemia did not alter basal glucose utilization, but maximal insulin-stimulated glucose utilization was sharply diminished (75%); hyperglycemia with hyperinsulinemia similarly reduced basal and maximal insulin-stimulated glucose utilization. In order to establish the role of the glucose transporter protein in these insulin-resistant states, we quantified GLUT 4 content by immunoblotting and GLUT 4 mRNA by solution hybridization/RNAse protection assays. Hyperglycemia (2 weeks) reduced total muscle GLUT 4 protein content (53%) and mRNA (46%), while subsequent hyperinsulinemia (72 h) with either normo- or hyperglycemia partially restored both total GLUT 4 protein and mRNA levels. As insulin-stimulated GLUT 4 content in plasma membranes was not diminished by combined hyperglycemia/hyperinsulinemia, these results indicate functional GLUT 4 translocation in this model and suggest suppression of GLUT 4 transporter activity." @default.
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- W2003476427 title "Mechanisms of Insulin-Resistant Glucose Utilization in Rat Skeletal Muscle" @default.
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- W2003476427 doi "https://doi.org/10.1006/mgme.1997.2653" @default.
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