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Related Experiment Videos

Rac GTPase signaling through the PP5 protein phosphatase.

Saverio Gentile1, Thomas Darden, Christian Erxleben

  • 1Environmental Biology Program, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 22, 2006
PubMed
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Thyroid hormone stimulates KCNH2 channels via Rac signaling, with protein phosphatase 5 (PP5) acting as a key effector. This study elucidates a novel Rac-GTP mechanism for PP5 activation, crucial for cellular processes.

Area of Science:

  • Molecular Cell Biology
  • Ion Channel Physiology
  • Signal Transduction

Background:

  • Thyroid hormone regulates KCNH2 channel activity in pituitary cells.
  • Rac GTPase signaling pathways are implicated in various cellular functions.

Purpose of the Study:

  • To investigate the Rac-dependent mechanism of KCNH2 channel stimulation by thyroid hormone.
  • To identify and characterize the role of protein phosphatase 5 (PP5) as a Rac effector.

Main Methods:

  • Patch-clamp electrophysiology in rat pituitary GH(4)C(1) cells.
  • Genetic manipulation including expression of PP5 mutants and TPR domains.
  • Inhibition studies using okadaic acid.

Main Results:

Related Experiment Videos

  • Protein phosphatase 5 (PP5) is identified as a physiological effector of Rac GTPase signaling.
  • A specific molecular mechanism for PP5 stimulation by Rac-GTP is proposed and validated.
  • Inhibition of PP5 blocked thyroid hormone and Rac-induced channel stimulation, which was rescued by a toxin-insensitive PP5 mutant.
  • The tetratricopeptide repeat (TPR) domain of PP5 was shown to inhibit channel stimulation.

    • Conclusions:

    • PP5 acts as a crucial mediator in thyroid hormone-induced KCNH2 channel stimulation via Rac signaling.
    • Rac-GTP directly stimulates PP5 activity, providing a novel mechanism for Rho-dependent signaling antagonism.
    • This pathway has implications for cellular processes like metastasis, immune cell chemotaxis, and neuronal development.