Cited by 1,139Metabolism, Diabetes, and CancerDiabetes, Cardiovascular Risks, and LipoproteinsAdipokines, Inflammation, and Metabolic Diseases

The DOI matches its Crossref record; 47 of the 48 references it cites were found in a registry or an index.

Insulin resistance differentially affects the PI 3-kinase- and MAP kinase-mediated signaling in human muscle

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Abstract

The broad nature of insulin resistant glucose metabolism in skeletal muscle of patients with type 2 diabetes suggests a defect in the proximal part of the insulin signaling network. We sought to identify the pathways compromised in insulin resistance and to test the effect of moderate exercise on whole-body and cellular insulin action. We conducted euglycemic clamps and muscle biopsies on type 2 diabetic patients, obese nondiabetics and lean controls, with and without a single bout of exercise. Insulin stimulation of the phosphatidylinositol 3-kinase (PI 3-kinase) pathway, as measured by phosphorylation of the insulin receptor and IRS-1 and by IRS protein association with p85 and with PI 3-kinase, was dramatically reduced in obese nondiabetics and virtually absent in type 2 diabetic patients. Insulin stimulation of the MAP kinase pathway was normal in obese and diabetic subjects. Insulin stimulation of glucose-disposal correlated with association of p85 with IRS-1. Exercise 24 hours before the euglycemic clamp increased phosphorylation of insulin receptor and IRS-1 in obese and diabetic subjects but did not increase glucose uptake or PI 3-kinase association with IRS-1 upon insulin stimulation. Thus, insulin resistance differentially affects the PI 3-kinase and MAP kinase signaling pathways, and insulin-stimulated IRS-1-association with PI 3-kinase defines a key step in insulin resistance.

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  1. Cheatham, 1994, Mol Cell Biol, 14, 4902, 10.1128/MCB.14.7.4902 · DOI
  2. Nyomba, 1990, Am J Physiol, 258, E964
  3. Hayashi, 1997, Am J Physiol, 273, E1039
  4. Koval, 1998, Am J Physiol, 274, E304
  5. O’Doherty, 1994, Am J Physiol, 266, E171
  6. Mikines, 1988, Am J Physiol, 254, E248
  7. Goodyear, 1995, Am J Physiol, 268, E987
  8. Zorzano, 1986, Am J Physiol, 251, E664
  9. Kochan, 1979, Am J Physiol, 236, E660

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Metadata

Authors
Cusi, K., Maezono, K., Osman, A., Pendergrass, M., Patti, M. E., Pratipanawatr, T., DeFronzo, R. A., Kahn, C. R., & Mandarino, L. J.
Affiliations
  • The University of Texas at San Antonio Health Science Center (US)
  • Harvard University (US)
  • Tulane University (US)
  • Joslin Diabetes Center (US)
Corresponding author
Mandarino, Lawrence J.
Venue
Journal of Clinical Investigation
Published
2000-02-01
Volume
105
Issue
3
Pages
311-320
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2120852510
Cited by
1,139
References
48
Citations by year
2026: 12 · 2025: 13 · 2024: 19 · 2023: 27 · 2022: 35 · 2021: 45 · 2020: 33 · 2019: 35 · 2018: 24 · 2017: 37 · 2016: 52 · 2015: 54 · 2014: 53 · 2013: 57 · 2012: 65
FWCI
13.25
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Diabetes Association
  • National Institutes of Health (5k08dk002526-03)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01-DK-24092, DK02526, R01DK047936, R01DK033201, R01DK024092, R01-DK-47936)
  • National Center for Research Resources (M01RR001346)
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 › Endocrinology, Diabetes and Metabolism › Adipokines, Inflammation, and Metabolic Diseases
Keywords
insulin resistance, skeletal muscle, type 2 diabetes, PI3K signaling, MAPK signaling, insulin receptor, IRS-1, p85 regulatory subunit, physical activity, glucose uptake, obesity, euglycemic clamp, insulin signaling
MeSH terms
Adult, Diabetes Mellitus, Type 2, Female, Humans, Insulin Resistance, Male, Phosphoproteins, Receptor, Insulin, Signal Transduction, Muscle, Skeletal, Phosphatidylinositol 3-Kinases, Mitogen-Activated Protein Kinases, Insulin Receptor Substrate Proteins

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