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Related Experiment Videos

Substrates for insulin-receptor kinase.

M Kasuga1, T Izumi, K Tobe

  • 1Third Department of Internal Medicine, University of Tokyo, Japan.

Diabetes Care
|March 1, 1990
PubMed
Summary

Insulin receptor tyrosine kinase activity is crucial for insulin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • Insulin's biological effects are linked to the tyrosine kinase activity of its receptor's beta-subunit.
  • A key hypothesis suggests insulin action is mediated by tyrosine phosphorylation of cellular substrates via the insulin-receptor tyrosine kinase.

Purpose of the Study:

  • To review and evaluate experimental evidence on insulin-stimulated protein phosphorylation.
  • To assess the validity of the phosphorylation cascade hypothesis for insulin action.

Main Methods:

  • Evaluation of in vitro studies using cell-free systems.
  • Analysis of in vivo studies using intact-cell systems.

Main Results:

  • In vitro: Tubulin, MAP2, tau, fodrin, CaMK, calmodulin, and lipocortins were identified as substrates.
  • In vivo: pp185, pp120, pp240, pp15, pp60, and pp62 were tyrosine phosphorylated in an insulin-dependent manner.
  • The functional consequences of in vivo phosphorylation remain unclear.

Conclusions:

  • Physiologically relevant substrates for insulin-receptor tyrosine kinase are not yet definitively established.
  • Further research is required to confirm the phosphorylation cascade hypothesis of insulin action.

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