PMID: 15375597Sep 18, 2004Paper

Insulin resistance in thermally-injured rats is associated with post-receptor alterations in skeletal muscle, liver and adipose tissue

International Journal of Molecular Medicine
Edward A CarterR G Tompkins

Abstract

Several of the possible molecular mechanisms that contribute to the insulin resistance associated with burn injury were examined in a rat model of thermal injury. Rats were subjected to full thickness scald injury (25% total body surface area, 10 sec burn) and resuscitated with saline. After 1, 2 and 3 weeks, urinary C-peptide excretion was measured in burned and sham-treated control animals. At 3 weeks after injury, glucose production by the liver and utilization by skeletal muscle was measured under insulin clamp conditions, insulin receptor binding was measured in skeletal muscle, liver and adipose tissue membranes and IRS-1 expression was measured by Western blot methods. Urinary C-peptide excretion was significantly elevated at 1, 2 and 3 weeks after injury. At 3 weeks after injury, several key metabolic processes were blunted, including the ability of insulin infusion to stimulate glucose uptake by skeletal muscle, the potency of insulin infusion for inhibiting hepatic glucose production, and the ability of a bolus injection of insulin to simulate phosphorylation of IRS-1 in liver, skeletal muscle or adipose tissue. In contrast, there were no apparent alterations in the binding of insulin to membranes from liver, skeletal...Continue Reading

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