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Related Experiment Videos

Galpha(12) and galpha(13) inhibit Ca(2+)-dependent exocytosis through Rho/Rho-associated kinase-dependent pathway.

Y Yamaguchi1, H Katoh, H Yasui

  • 1Laboratory of Molecular Neurobiology, Graduate School of Biostudies, Kyoto University, Kyoto, Japan.

Journal of Neurochemistry
|July 19, 2000
PubMed
Summary

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The Gα12 and Gα13 proteins regulate neurotransmitter release by influencing calcium-dependent exocytosis. This process involves the RhoA and Rho-associated kinase pathway, impacting dopamine release in PC12 cells.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Heterotrimeric G protein-coupled receptors modulate neurotransmitter release.
  • The specific mechanisms involving the Gα12 family in this process remain unclear.

Purpose of the Study:

  • To investigate the role of the Gα12 family of heterotrimeric G proteins in regulating neurotransmitter release.
  • To elucidate the downstream signaling pathways involved in Gα12/Gα13-mediated regulation of dopamine release.

Main Methods:

  • Established PC12 cell lines with inducible expression of constitutively active Gα12 or Gα13.
  • Measured high K+-evoked and ionomycin-induced [3H]dopamine release.
  • Assessed intracellular Ca2+ concentrations.
  • Investigated the effects of RhoA expression and Y-27632 (Rho-associated kinase inhibitor).

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Main Results:

  • Expression of active Gα12 or Gα13 inhibited high K+-evoked [3H]dopamine release without affecting intracellular Ca2+ levels.
  • Gα12 and Gα13 also inhibited ionomycin-induced [3H]dopamine release.
  • These inhibitory effects were mimicked by RhoA expression and blocked by Y-27632, indicating a Rho/ROCK-dependent pathway.

Conclusions:

  • Gα12 and Gα13 regulate Ca2+-dependent exocytosis involved in neurotransmitter release.
  • This regulation occurs via a pathway involving RhoA and Rho-associated kinase.
  • Findings reveal a novel mechanism for controlling neurotransmitter release through the Gα12/13-Rho/ROCK axis.