Cited by 825Diabetes, Cardiovascular Risks, and LipoproteinsMetabolism, Diabetes, and CancerAdipokines, Inflammation, and Metabolic Diseases

Etiology of Insulin Resistance

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Petersen, Kitt Falk, Shulman, Gerald I.·2006·The American Journal of Medicine

Abstract

Type 2 diabetes mellitus is a major cause of morbidity and mortality worldwide, and the prevalence is set to increase dramatically over the coming decades. Understanding the metabolic pathways that lead to type 2 diabetes is therefore an important healthcare objective. Novel investigational techniques based on magnetic resonance spectroscopy (MRS) have allowed real-time insight into the molecular defects in patients with type 2 diabetes, revealing that insulin resistance is a product of decreased insulin-stimulated skeletal muscle glycogen synthesis, which can mostly be attributed to decreased insulin-stimulated glucose transport (Glut 4) activity. This defect appears to be a result of intracellular lipid-induced inhibition of insulin-stimulated insulin-receptor substrate (IRS)-1 tyrosine phosphorylation resulting in reduced IRS-1-associated phosphatidyl inositol 3 kinase activity. The hypothesis that insulin resistance is a result of accumulation of intracellular lipid metabolites (e.g., fatty acyl CoAs, diacylglycerol) in skeletal muscle and hepatocytes is supported by observations in patients and mouse models of lipodystrophy. Furthermore, the increase in hepatic insulin sensitivity observed in patients with type 2 diabetes following weight loss is also accompanied by a significant reduction in intrahepatic fat without any changes in circulating adipocytokines (interleukin-6, resistin, leptin). Finally, recent MRS studies in healthy, lean, elderly subjects and lean insulin-resistant offspring of parents with type 2 diabetes have demonstrated that reduced mitochondrial activity may also lead to increased intramyocellular lipid content and insulin resistance in skeletal muscle in these individuals. In summary, in vivo MRS has proved to be an important tool for elucidating the causal chain of events that causes insulin resistance. Understanding the cellular mechanism(s) of insulin resistance in turn offers the prospect of better targeted and more effective therapeutic interventions for treatment and prevention of type 2 diabetes.

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Crossref · 10.1016/j.amjmed.2006.01.009

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  • Increased intramyocellular fat content and fatty acid metabolites have a pivotal role in the development of skeletal muscle insulin resistance.

    “an increased intramyocellar fat content and fatty acid metabolites have been shown to play a pivotal role in the development of insulin resistance in skeletal muscle [11–15].”

    From Pathogenesis of insulin resistance in skeletal muscle (2010) · cites this paper as [13]

  • Dysregulation of fatty acid metabolism has a central role in the development of insulin resistance in skeletal muscle.

    “Dysregulation of fatty acid metabolism plays a pivotal role in the pathogenesis of insulin resistance in skeletal muscle.”

    From Pathogenesis of insulin resistance in skeletal muscle (2010) · cites this paper as [13]

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Authors
Petersen, K. F., & Shulman, G. I.
Affiliations
Howard Hughes Medical Institute (US)
Venue
The American Journal of Medicine
Publisher
Elsevier BV
Published
2006-05
Volume
119
Issue
5
Pages
S10-S16
ISSN
0002-9343 (ISSN-L)
OpenAlex
W1982488301
Cited by
825
References
56
Citations by year
2026: 19 · 2025: 25 · 2024: 18 · 2023: 26 · 2022: 18 · 2021: 34 · 2020: 31 · 2019: 26 · 2018: 25 · 2017: 27 · 2016: 44 · 2015: 41 · 2014: 55 · 2013: 52 · 2012: 43
FWCI
10.84
Type
journal article
Language
en
Open access
Locations
  • The American Journal of Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute on Aging (R01AG023686)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK040936)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
Keywords
insulin resistance, type 2 diabetes, IRS-1 tyrosine phosphorylation, PI3K signaling, intracellular lipid accumulation, fatty acyl-CoA, diacylglycerol, lipodystrophy, hepatic insulin sensitivity, weight loss, intrahepatic fat, mitochondrial dysfunction, intramyocellular lipid, magnetic resonance spectroscopy, adipokines
MeSH terms
Diabetes Mellitus, Type 2, Humans, Hypoglycemic Agents, Insulin Resistance, Mitochondria, Magnetic Resonance Spectroscopy, Obesity, Phosphoproteins, Weight Loss, Thiazolidinediones, Glucose Transporter Type 4, Insulin Receptor Substrate Proteins

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