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Involvement of glycogen synthase kinase-3beta in hydrogen peroxide-induced suppression of Tcf/Lef-dependent

Soon Young Shin1, Byung Rho Chin, Young Han Lee

  • 1Division of Molecular and Life Science, College of Science and Technology, Hanyang University, Ansan 426-791, Korea.

Cellular Signalling
|July 5, 2005
PubMed

Insights

Hydrogen peroxide (H2O2) activates GSK-3beta by dephosphorylation, impacting cell death pathways. This study reveals H2O2

Area of Science:

  • Cell Biology
  • Molecular Signaling
  • Biochemistry

Background:

  • Hydrogen peroxide (H2O2) is a key mediator of cellular responses, including cytotoxicity.
  • Glycogen synthase kinase-3 beta (GSK-3beta) plays a crucial role in cell proliferation and death signaling pathways.

Purpose of the Study:

  • To investigate the role of GSK-3beta in hydrogen peroxide-induced cellular responses.
  • To elucidate the signaling mechanisms linking H2O2, GSK-3beta, and Wnt pathway components.

Main Methods:

  • Cell treatment with H2O2.
  • Western blotting to assess protein phosphorylation and levels (GSK-3beta, Akt/PKB, beta-catenin).
  • Overexpression of Akt/PKB and Dvl-1.
  • Reporter assays for Tcf/Lef-dependent transcription.

Main Results:

  • H2O2 rapidly dephosphorylates and activates GSK-3beta in a dose- and time-dependent manner.
  • H2O2 also dephosphorylates Akt/PKB; Akt/PKB overexpression attenuates GSK-3beta dephosphorylation.
  • Wnt signaling component Dvl-1 stimulates Akt/PKB, inhibiting H2O2-induced GSK-3beta dephosphorylation.
  • H2O2 reduces beta-catenin levels and inhibits Tcf/Lef transcriptional activity.

Conclusions:

  • GSK-3beta is a key player in H2O2-mediated cellular signaling.
  • The Akt/PKB and Wnt pathways modulate GSK-3beta activation by H2O2.
  • GSK-3beta is implicated in the H2O2-induced inhibition of Tcf/Lef-dependent transcription, suggesting its role in H2O2-mediated cytotoxicity.

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