Skeletal muscle lipid peroxidation and insulin resistance in humans.

Academic Article

Abstract

  • OBJECTIVE: The relationships among skeletal muscle lipid peroxidation, intramyocellular lipid content (IMCL), and insulin sensitivity were evaluated in nine insulin-sensitive (IS), 13 insulin-resistant (IR), and 10 adults with type 2 diabetes (T2DM). DESIGN: Insulin sensitivity was assessed by hyperinsulinemic-euglycemic clamp [glucose disposal rate (GDR)]. Lipid peroxidation was assessed by 4-hydroxynonenal (HNE)-protein adducts and general oxidative stress by protein carbonyl content. All patients were sedentary. RESULTS: Protein-HNE adducts were elevated 1.6-fold in T2DM compared with IS adults, whereas IR showed intermediate levels of HNE-modified proteins. Protein-HNE adducts correlated with GDR, waist circumference, and body mass index. IMCL was increased by 4.0- and 1.9-fold in T2DM and IR patients, respectively, compared with IS, and was correlated with GDR and waist circumference but not BMI. Protein carbonyls were not different among groups and did not correlate with any of the measured variables. Correlations were detected between IMCL and protein-HNE. CONCLUSION: Our data show for the first time that skeletal muscle protein-HNE adducts are related to the severity of insulin resistance in sedentary adults. These results suggest that muscle lipid peroxidation could be involved in the development of insulin resistance.
  • Keywords

  • Adiposity, Adult, Aldehydes, Blood Glucose, Body Mass Index, Diabetes Mellitus, Type 2, Female, Glucose Clamp Technique, Humans, Insulin Resistance, Lipid Peroxidation, Male, Middle Aged, Muscle, Skeletal, Young Adult
  • Digital Object Identifier (doi)

    Author List

  • Ingram KH; Hill H; Moellering DR; Hill BG; Lara-Castro C; Newcomer B; Brandon LJ; Ingalls CP; Penumetcha M; Rupp JC
  • Start Page

  • E1182
  • End Page

  • E1186
  • Volume

  • 97
  • Issue

  • 7