Absence of Insulin Receptor Substrate-1 Expression Does Not Alter GLUT1 or GLUT4 Abundance or Contraction-Stimulated Glucose Uptake by Mouse Skeletal Muscle

The purpose of this study was to determine the influence of insulin receptor substrate-1 (IRS-1) expression on GLUT1 and GLUT4 glucose transporter protein abundance, contraction-stimulated glucose uptake, and contraction-induced glycogen depletion by skeletal muscle. Mice (6 months old) from three genotypes were studied: wild-type (IRS-1^+/+), heterozygous (IRS-1^+/-) for the null allele, and IRS-1 knockouts (IRS-1^-/-) lacking a functional IRS-1 gene. In situ muscle contraction was induced (electrical stimulation of sciatic nerve) in one hindlimb using contralateral muscles as controls. Soleus and extensor digitorum longus were dissected and 2-deoxyglucose uptake was measured in vitro. 2-Deoxyglucose uptake was higher in basal muscles (no contractions) from IRS-1^-/- vs. both other genotypes. Contraction-stimulated 2-deoxyglucose uptake and glycogen depletion did not differ among genotypes. Muscle IRS-1 protein was undetectable for IRS-1^-/- mice, and values were approximately 40 % lower in IRS-1^+/- than in IRS-1^+/+ mice. No difference was found in IRS-1^+/+ compared to IRS-1^-/- groups regarding muscle abundance of GLUT1 and GLUT4. Substantial reduction or elimination of IRS-1 did not alter the hallmark effects of contractions on muscle carbohydrate metabolism - activation of glucose uptake and glycogen depletion.

Key words:

Exercise - Glucose Transport - Insulin Signaling - Contractile Activity - Glycogen

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