Cited by 173Adipose Tissue and MetabolismPeroxisome Proliferator-Activated ReceptorsAdipokines, Inflammation, and Metabolic Diseases

Differential Roles of Insulin Receptor Substrates in Brown Adipocyte Differentiation

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Tseng, Yu-Hua, Kriauciunas, Kristina M., Kokkotou, Efi, Kahn, C. Ronald·2004·Molecular and Cellular Biology

Abstract

Insulin promotes adipocyte differentiation via a complex signaling network involving multiple insulin receptor substrates (IRSs). In cultured brown preadipocytes, expression of IRS-1 and IRS-2 mRNAs and proteins was at relatively high levels before and after differentiation into mature fat cells, while IRS-3 transcript was not detectable in preadipocytes but increased during the course of differentiation, and IRS-4 mRNA was barely detected in both states. To determine more precisely the roles of various IRS proteins in adipogenesis, we established and characterized brown preadipocyte cell lines from wild-type and IRS knockout (KO) animals. While wild-type, IRS-2 KO, and IRS-4 KO cells fully differentiated into mature adipocytes, IRS-3 KO cells showed a moderate defect in differentiation and IRS-1 KO cells exhibited a severe defect in the process. Cells lacking both IRS-1 and IRS-3 completely failed to differentiate. Expression of the adipogenic markers peroxisome proliferator-activated receptor gamma (PPARgamma), CCAAT/enhancer-binding protein alpha, fatty acid synthase, glucose transporter 4, and the transcription factor signal transducer and activator of transcription 5, as well as the brown-fat-specific markers PPARgamma coactivator 1 alpha and uncoupling protein 1, mirrored the differentiation pattern. Reconstitution of the IRS-1 KO cells with IRS-1 and IRS-4, but not IRS-2 or IRS-3, compensated for the lack of differentiation in IRS-1 KO cells. A chimeric molecule containing the N terminus of IRS-1 and the C terminus of IRS-2, but not one with the N terminus of IRS-2 and the C terminus of IRS-1, also rescued differentiation. Expression of Wnt 10a, a molecule known to inhibit adipogenesis, was dramatically increased in the IRS-1 KO cells, and this could be reduced by overexpression of IRS-1 or IRS-4, which was correlated with restoration of differentiation. These data indicate that both IRS-1 and -3 play important roles in the differentiation of brown adipocytes and that the N terminus of IRS-1 is more important for this function of the molecule. Although IRS-4 is not essential for the process, overexpression of IRS-4 can compensate for the deficiency in differentiation in IRS-1 KO cells.

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  • Brown preadipocytes lacking IRS-1 display a severe defect in differentiation.

    “Brown preadipocytes lacking the insulin receptor substrate (IRS)-1 display a severe defect in differentiation 109; and IRS-2 null brown adipocytes have impaired glucose uptake function 110.”

    From Cellular bioenergetics as a target for obesity therapy (2010) · cites this paper as [109]

  • The insulin/IGF-1 signaling system exerts an essential role in brown fat differentiation and function.

    “In addition, the insulin/IGF-1 signaling system also exerts an essential role in brown fat differentiation and function (Figure 3).”

    From Cellular bioenergetics as a target for obesity therapy (2010) · cites this paper as [109]

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  1. [36]Rangwala, S. M., and M. A. Lazar. 2000. Transcriptional control of adipogenesis. Annu. Rev. Nutr. 20:535-559. [DOI] [PubMed] [Google Scholar]

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Authors
Tseng, Y.-H., Kriauciunas, K. M., Kokkotou, E., & Kahn, C. R.
Affiliations
Joslin Diabetes Center (US)
Venue
Molecular and Cellular Biology
Published
2004-03-01
Volume
24
Issue
5
Pages
1918-1929
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2149340540
Cited by
173
References
46
Citations by year
2026: 3 · 2025: 9 · 2024: 1 · 2023: 3 · 2022: 5 · 2021: 4 · 2020: 13 · 2019: 8 · 2018: 10 · 2017: 13 · 2016: 10 · 2015: 6 · 2014: 6 · 2013: 8 · 2012: 10
FWCI
5.36
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK055545, DK 33201, F32DK101183, DK101183, R01DK033201, DK55545)
Topics
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Peroxisome Proliferator-Activated Receptors
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
Keywords
insulin receptor substrate, brown adipocyte differentiation, adipogenesis, IRS-1, insulin receptor substrate 2, insulin receptor substrate 3, WNT10A, PPARγ, C/EBPα, UCP1, PPARγ coactivator-1α, insulin signaling
MeSH terms
Animals, Adipose Tissue, Brown, Cell Differentiation, Cells, Cultured, Humans, Insulin, Phosphoproteins, Phosphorylation, Receptor, Insulin, RNA, Messenger, Tyrosine, Biomarkers, Adipocytes, Mice, Knockout, Mitogen-Activated Protein Kinases, MAP Kinase Signaling System, Intracellular Signaling Peptides and Proteins, Adaptor Proteins, Signal Transducing, Mice, Insulin Receptor Substrate Proteins

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