Cited by 291Metabolism, Diabetes, and CancerPancreatic function and diabetesDiabetes, Cardiovascular Risks, and Lipoproteins

Contrasting Effects of IRS-1 Versus IRS-2 Gene Disruption on Carbohydrate and Lipid Metabolism in Vivo

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Previs, Stephen F., Withers, Dominic J., Ren, Jian-Ming, White, Morris F., Shulman, Gerald I.·2000·Journal of Biological Chemistry

Abstract

To examine the impact of homozygous genetic disruption of insulin receptor substrate (IRS)-1 (IRS-1(-/-)) or IRS-2 (IRS-2(-/-)) on basal and insulin-stimulated carbohydrate and lipid metabolism in vivo, we infused 18-h fasted mice (wild-type (WT), IRS-1(-/-), and IRS-2(-/-)) with [3-(3)H]glucose and [(2)H(5)]glycerol and assessed rates of glucose and glycerol turnover under basal (0-90 min) and hyperinsulinemic-euglycemic clamp (90-210 min; 5 mm glucose, and 5 milliunits of insulin.kg(-)(1).min(-)(1)) conditions. Both IRS-1(-)(/-) and IRS-2(-)(/-) mice were insulin-resistant as reflected by markedly impaired insulin-stimulated whole-body glucose utilization compared with WT mice. Insulin resistance in the IRS-1(-)(/-) mice could be ascribed mainly to decreased insulin-stimulated peripheral glucose metabolism. In contrast, IRS-2(-)(/-) mice displayed multiple defects in insulin-mediated carbohydrate metabolism as reflected by (i) decreased peripheral glucose utilization, (ii) decreased suppression of endogenous glucose production, and (iii) decreased hepatic glycogen synthesis. Additionally, IRS-2(-)(/-) mice also showed marked insulin resistance in adipose tissue as reflected by reduced suppression of plasma free fatty acid concentrations and glycerol turnover during the hyperinsulinemic-euglycemic clamp. These data suggest important tissue-specific roles for IRS-1 and IRS-2 in mediating the effect of insulin on carbohydrate and lipid metabolism in vivo in mice. IRS-1 appears to have its major role in muscle, whereas IRS-2 appears to impact on liver, muscle, and adipose tissue.

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  • In the liver, insulin activates the insulin receptor kinase, which phosphorylates IRS1 and IRS2, leading to activation of PI3K and ultimately Akt2; Akt2 activation promotes glycogen synthesis and inhibits gluconeogenesis.

    “In the liver, insulin activates the insulin receptor kinase, which phosphorylates IRS1 and IRS2, leading to activation of PI3K and ultimately Akt2 (figure 2).83 At this point, Akt2 activation promotes glycogen synthesis and inhibits gluconeogenesis.”

    From Lipid-induced insulin resistance: unravelling the mechanism (2010) · cites this paper as [83]

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Authors
Previs, S. F., Withers, D. J., Ren, J.-M., White, M. F., & Shulman, G. I.
Affiliations
  • Howard Hughes Medical Institute (US)
  • Joslin Diabetes Center (US)
Corresponding author
Shulman, Gerald I.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2000-12
Volume
275
Issue
50
Pages
38990-38994
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2006304210
Cited by
291
References
23
Citations by year
2026: 1 · 2025: 3 · 2024: 5 · 2023: 5 · 2022: 5 · 2021: 7 · 2020: 7 · 2019: 6 · 2018: 9 · 2017: 5 · 2016: 10 · 2015: 9 · 2014: 7 · 2013: 16 · 2012: 15
FWCI
5.79
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • U.S. Public Health Service (P30 DK45735, R01 DK-40936)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P30DK45735, R01-DK40936, R01DK040936, P30DK045735)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
Keywords
IRS-1, insulin receptor substrate 2, insulin resistance, glucose metabolism, lipid metabolism, hyperinsulinemic-euglycemic clamp, hepatic glycogen synthesis, endogenous glucose production
MeSH terms
Adipose Tissue, Animals, Fatty Acids, Nonesterified, Food Deprivation, Glucose, Glycerol, Insulin, Liver, Male, Gas Chromatography-Mass Spectrometry, Muscles, Mutation, Phenotype, Phosphoproteins, Radioimmunoassay, Time Factors, Intracellular Signaling Peptides and Proteins, Carbohydrate Metabolism, Lipid Metabolism, Mice, Insulin Receptor Substrate Proteins

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