Cited by 319Metabolism, Diabetes, and CancerProtein Kinase Regulation and GTPase SignalingWnt/β-catenin signaling in development and cancer

Phosphorylation of insulin receptor substrate 1 by glycogen synthase kinase 3 impairs insulin action

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Eldar-Finkelman, Hagit, Krebs, Edwin G.·1997·Proceedings of the National Academy of Sciences

Abstract

The phosphorylation of insulin receptor substrate 1 (IRS-1) on tyrosine residues by the insulin receptor (IR) tyrosine kinase is involved in most of the biological responses of insulin. IRS-1 mediates insulin signaling by recruiting SH2 proteins through its multiple tyrosine phosphorylation sites. The phosphorylation of IRS-1 on serine/threonine residues also occurs in cells; however, the particular protein kinase(s) promoting this type of phosphorylation are unknown. Here we report that glycogen synthase kinase 3 (GSK-3) is capable of phosphorylating IRS-1 and that this modification converts IRS-1 into an inhibitor of IR tyrosine kinase activity in vitro . Expression of wild-type GSK-3 or an “unregulated” mutant of the kinase (S9A) in CHO cells overexpressing IRS-1 and IR, resulted in increased serine phosphorylation levels of IRS-1, suggesting that IRS-1 is a cellular target of GSK-3. Furthermore, insulin-induced tyrosine phosphorylation of IRS-1 and IR was markedly suppressed in cells expressing wild-type or the S9A mutant, indicating that expression of GSK-3 impairs IR tyrosine kinase activity. Taken together, our studies suggest a new role for GSK-3 in attenuating insulin signaling via its phosphorylation of IRS-1 and may provide new insight into mechanisms important in insulin resistance.

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Authors
Eldar-Finkelman, H., & Krebs, E. G.
Affiliations
University of Washington (US)
Corresponding author
Krebs, Edwin G.
Venue
Proceedings of the National Academy of Sciences
Published
1997-09-02
Volume
94
Issue
18
Pages
9660-9664
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2049875806
Cited by
319
References
39
Citations by year
2026: 4 · 2025: 5 · 2024: 5 · 2023: 4 · 2022: 8 · 2021: 7 · 2020: 4 · 2019: 6 · 2018: 10 · 2017: 7 · 2016: 9 · 2015: 7 · 2014: 10 · 2013: 10 · 2012: 8
FWCI
4.50
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Muscular Dystrophy Association
  • Washington State University
  • University of Washington
  • National Institutes of Health (5r01dk042528-10)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK42528)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Wnt/β-catenin signaling in development and cancer
Keywords
IRS-1, glycogen synthase kinase-3, serine phosphorylation, insulin receptor tyrosine kinase, insulin signaling, insulin resistance, IRS-1 tyrosine phosphorylation, SH2 domain proteins, kinase inhibition
MeSH terms
Animals, Cricetinae, Insulin, Phosphoproteins, Phosphorylation, Recombinant Proteins, Substrate Specificity, CHO Cells, Calcium-Calmodulin-Dependent Protein Kinases, Glycogen Synthase Kinases, Glycogen Synthase Kinase 3, Insulin Receptor Substrate Proteins

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