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Related Experiment Videos

Surfing the insulin signaling web.

E Van Obberghen1, V Baron, L Delahaye

  • 1Inserm U 145, IFR 50, Faculté de Médecine, Avenue de Valombrose, Nice Cedex, France. vanobbeg@unice.fr

European Journal of Clinical Investigation
|December 12, 2001
PubMed
Summary

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Insulin receptor substrate (IRS) proteins are key signaling molecules. They integrate signals from insulin and IGF-I, controlling cellular responses and signal termination.

Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Endocrinology

Background:

  • Insulin and IGF-I exert diverse biological actions via cell surface tyrosine kinase receptors.
  • Activated receptors phosphorylate endogenous substrates, notably insulin receptor substrate (IRS) proteins.
  • IRS proteins serve as crucial platforms for downstream signaling molecule recruitment.

Purpose of the Study:

  • To review the role of IRS proteins in insulin and IGF-I signaling.
  • To highlight the orchestration of signal specificity, integration, and termination by IRS proteins.
  • To present the authors' specific contributions and perspectives on IRS function.

Main Methods:

  • Literature review focusing on IRS protein function.
  • Analysis of signaling cascades initiated by insulin/IGF-I receptor activation.

Related Experiment Videos

  • Discussion of protein-protein interactions involving SH2 domain-containing proteins.

    • Main Results:

    • IRS proteins are central to signal transduction from insulin and IGF-I receptors.
    • Phosphotyrosine motifs on IRS proteins bind SH2 domain-containing proteins like SHP-2, Grb-2, and PI3 kinase.
    • IRS molecules are critical for generating signal specificity and integrating multiple stimuli.

    Conclusions:

    • IRS proteins are multifunctional adaptors essential for regulating cellular responses to insulin and IGF-I.
    • They play a vital role in signal integration, specificity, termination, and modulation.
    • Understanding IRS function is key to deciphering complex cellular signaling networks.