Cited by 357Metabolism, Diabetes, and CancerDiabetes, Cardiovascular Risks, and LipoproteinsAdipokines, Inflammation, and Metabolic Diseases

Potential role of glycogen synthase kinase-3 in skeletal muscle insulin resistance of type 2 diabetes.

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Nikoulina, S E, Ciaraldi, T P, Mudaliar, S, Mohideen, P, Carter, L, Henry, R R·2000·Diabetes

Abstract

Glycogen synthase (GS) activity is reduced in skeletal muscle of type 2 diabetes, despite normal protein expression, consistent with altered GS regulation. Glycogen synthase kinase-3 (GSK-3) is involved in regulation (phosphorylation and deactivation) of GS. To access the potential role of GSK-3 in insulin resistance and reduced GS activity in type 2 diabetes, the expression and activity of GSK-3 were studied in biopsies of vastus lateralis from type 2 and nondiabetic subjects before and after 3-h hyperinsulinemic (300 mU x m(-2) x min(-1))-euglycemic clamps. The specific activity of GSK-3alpha did not differ between nondiabetic and diabetic muscle and was decreased similarly after 3-h insulin infusion. However, protein levels of both alpha and beta isoforms of GSK-3 were elevated (approximately 30%) in diabetic muscle compared with lean (P < 0.01) and weight-matched obese nondiabetic subjects (P < 0.05) and were unchanged by insulin infusion. Thus, both basal and insulin-stimulated total GSK-3 activities were elevated by approximately twofold in diabetic muscle. GSK-3 expression was related to in vivo insulin action, as GSK-3 protein was negatively correlated with maximal insulin-stimulated glucose disposal rates. In summary, GSK-3 protein levels and total activities are 1) elevated in type 2 diabetic muscle independent of obesity and 2) inversely correlated with both GS activity and maximally insulin-stimulated glucose disposal. We conclude that increased GSK-3 expression in diabetic muscle may contribute to the impaired GS activity and skeletal muscle insulin resistance present in type 2 diabetes.

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Authors
Nikoulina, S. E., Ciaraldi, T. P., Mudaliar, S., Mohideen, P., Carter, L., & Henry, R. R.
Affiliations
University of California San Diego (US)
Venue
Diabetes
Published
2000-02-01
Volume
49
Issue
2
Pages
263-271
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W2098017074
Cited by
357
References
0
Citations by year
2026: 6 · 2025: 9 · 2024: 8 · 2023: 10 · 2022: 13 · 2021: 24 · 2020: 13 · 2019: 16 · 2018: 17 · 2017: 22 · 2016: 13 · 2015: 12 · 2014: 12 · 2013: 15 · 2012: 10
FWCI
3.97
Type
journal article
Language
en
Open access
Locations
  • Diabetes (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Center for Research Resources (MO1 RR00827, M01RR000827)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
Keywords
glycogen synthase kinase-3, type 2 diabetes, skeletal muscle insulin resistance, glycogen synthase, GSK3α, GSK3β, insulin-stimulated glucose disposal, hyperinsulinemic-euglycemic clamp, vastus lateralis, obesity
MeSH terms
Adult, Diabetes Mellitus, Type 2, Glycogen Synthase, Humans, Insulin, Insulin Resistance, Isoenzymes, Middle Aged, Phosphorylation, Reference Values, Calcium-Calmodulin-Dependent Protein Kinases, Muscle, Skeletal, Glycogen Synthase Kinases, Glycogen Synthase Kinase 3

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