Muscle-Specific IRS-1 Ser→Ala Transgenic Mice Are Protected From Fat-Induced Insulin Resistance in Skeletal Muscle

OBJECTIVE—Insulin resistance in skeletal muscle plays a critical role in the pathogenesis of type 2 diabetes, yet the cellular mechanisms responsible for insulin resistance are poorly understood. In this study, we examine the role of serine phosphorylation of insulin receptor substrate (IRS)-1 in mediating fat-induced insulin resistance in skeletal muscle in vivo. RESEARCH DESIGN AND METHODS—To directly assess the role of serine phosphorylation in mediating fat-induced insulin resistance in skeletal muscle, we generated muscle-specific IRS-1 Ser302, Ser307, and Ser612 mutated to alanine (Tg IRS-1 Ser→Ala) and IRS-1 wild-type (Tg IRS-1 WT) transgenic mice and examined insulin signaling and insulin action in skeletal muscle in vivo. RESULTS—Tg IRS-1 Ser→Ala mice were protected from fat-induced insulin resistance, as reflected by lower plasma glucose concentrations during a glucose tolerance test and increased insulin-stimulated muscle glucose uptake during a hyperinsulinemic-euglycemic clamp. In contrast, Tg IRS-1 WT mice exhibited no improvement in glucose tolerance after high-fat feeding. Furthermore, Tg IRS-1 Ser→Ala mice displayed a significant increase in insulin-stimulated IRS-1–associated phosphatidylinositol 3-kinase activity and Akt phosphorylation in skeletal muscle in vivo compared with WT control littermates. CONCLUSIONS—These data demonstrate that serine phosphorylation of IRS-1 plays an important role in mediating fat-induced insulin resistance in skeletal muscle in vivo.

• Publication year

  2008

• Venue

  Diabetes

• Publication date

  2008-10-01

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.2337/db06-0454PMID 18633112PMCID 2551673
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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