Cited by 487Metabolism, Diabetes, and CancerDiabetes, Cardiovascular Risks, and LipoproteinsPI3K/AKT/mTOR signaling in cancer

Normal insulin-dependent activation of Akt/protein kinase B, with diminished activation of phosphoinositide 3-kinase, in muscle in type 2 diabetes

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Kim, Young-Bum, Nikoulina, Svetlana E., Ciaraldi, Theodore P., Henry, Robert R., Kahn, Barbara B.·1999·Journal of Clinical Investigation

Abstract

To determine whether the serine/threonine kinase Akt (also known as protein kinase B) is activated in vivo by insulin administration in humans, and whether impaired activation of Akt could play a role in insulin resistance, we measured the activity and phosphorylation of Akt isoforms in skeletal muscle from 3 groups of subjects: lean, obese nondiabetic, and obese type 2 diabetic. Vastus lateralis biopsies were taken in the basal (overnight fast) and insulin-stimulated (euglycemic clamp) states. Insulin-stimulated glucose disposal was reduced 31% in obese subjects and 63% in diabetic subjects, compared with lean subjects. Glycogen synthase (GS) activity in the basal state was reduced 28% in obese subjects and 49% in diabetic subjects, compared with lean subjects. Insulin-stimulated GS activity was reduced 30% in diabetic subjects. Insulin treatment activated the insulin receptor substrate-1-associated (IRS-1-associated) phosphoinositide 3-kinase (PI 3-kinase) 6.1-fold in lean, 3.7-fold in obese, and 2.4-fold in diabetic subjects. Insulin also stimulated IRS-2-associated PI 3-kinase activity 2.2-fold in lean subjects, but only 1.4-fold in diabetic subjects. Basal activity of Akt1/Akt2 (Akt1/2) and Akt3 was similar in all groups. Insulin increased Akt1/2 activity 1.7- to 2. 0-fold, and tended to activate Akt3, in all groups. Insulin-stimulated phosphorylation of Akt1/2 was normal in obese and diabetic subjects. In lean subjects only, insulin-stimulated Akt1/2 activity correlated with glucose disposal rate. Thus, insulin activation of Akt isoforms is normal in muscle of obese nondiabetic and obese diabetic subjects, despite decreases of approximately 50% and 39% in IRS-1- and IRS-2-associated PI 3-kinase activity, respectively, in obese diabetic subjects. It is therefore unlikely that Akt plays a major role in the resistance to insulin action on glucose disposal or GS activation that is observed in muscle of obese type 2 diabetic subjects.

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  • Association of p85 subunit of PI3K with IRS-1 and PI3K activation are greatly attenuated in obese nondiabetic and type 2 diabetic subjects compared with lean healthy controls.

    “Association of the p85 subunit of PI3K with IRS-1 and activation of PI3K also are greatly attenuated in obese nondiabetic and type 2 diabetic subjects compared with lean healthy controls [7, 165, 166].”

    From Pathogenesis of insulin resistance in skeletal muscle (2010) · cites this paper as [166]

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Authors
Kim, Y.-B., Nikoulina, S. E., Ciaraldi, T. P., Henry, R. R., & Kahn, B. B.
Affiliations
  • Beth Israel Deaconess Medical Center (US)
  • University of California San Diego (US)
Corresponding author
Kahn, Barbara B.
Venue
Journal of Clinical Investigation
Published
1999-09-15
Volume
104
Issue
6
Pages
733-741
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2089582113
Cited by
487
References
68
Citations by year
2026: 3 · 2025: 12 · 2024: 7 · 2023: 13 · 2022: 9 · 2021: 18 · 2020: 10 · 2019: 13 · 2018: 10 · 2017: 9 · 2016: 14 · 2015: 16 · 2014: 14 · 2013: 21 · 2012: 16
FWCI
10.01
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Diabetes Association
  • U.S. Department of Veterans Affairs
  • National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 43051, R37DK043051, R56DK043051, R01DK043051)
  • 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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
Keywords
Akt/protein kinase B, phosphatidylinositol 3-kinase, insulin resistance, type 2 diabetes, skeletal muscle, insulin-stimulated glucose disposal, glycogen synthase, IRS-1, insulin receptor substrate 2, Akt isoforms, Akt phosphorylation, obesity, vastus lateralis
MeSH terms
Adult, Aged, Diabetes Mellitus, Type 2, Female, Glycogen Synthase, Humans, Insulin, Insulin Resistance, Male, Middle Aged, Phosphorylation, Proto-Oncogene Proteins, Body Mass Index, Protein Serine-Threonine Kinases, Muscle, Skeletal, Phosphatidylinositol 3-Kinases, Proto-Oncogene Proteins c-akt

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