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Related Experiment Videos

Essential role for Galpha13 in endothelial cells during embryonic development.

Kathleen M Ruppel1, David Willison, Hiroshi Kataoka

  • 1Cardiovascular Research Institute and Departments of Pediatrics, Medicine, and Cellular and Molecular Pharmacology, University of California, San Francisco, CA 94143, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 28, 2005
PubMed
Summary

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Galpha13 in endothelial cells is crucial for mouse embryonic vascular development, potentially mediating protease-activated receptor-1 (PAR1) signaling. Its absence causes embryonic lethality and vascular defects, highlighting its vital role.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Protease-activated receptor-1 (PAR1) and other G protein-coupled receptors are vital for vascular development.
  • The specific role of Galpha13 in endothelial cells during embryonic vascularization remains largely unexplored.

Purpose of the Study:

  • To investigate the function of Galpha13 within endothelial cells during mouse embryonic development.
  • To determine if Galpha13 mediates signaling pathways involving PAR1 in vascular development.

Main Methods:

  • Generated endothelial-specific Galpha13 knockout mice.
  • Utilized LacZ reporter to track Galpha13 expression in endothelial cells.
  • Employed a Tie2 promoter-driven Galpha13 transgene for rescue experiments.

Related Experiment Videos

  • Analyzed conventional Galpha13 knockout embryos for vascular phenotypes.

    • Main Results:

    • High Galpha13 expression was observed in midgestation embryonic endothelial cells.
    • Endothelial-specific Galpha13 knockout embryos exhibited embryonic lethality (days 9.5-11.5) and vascular defects similar to PAR1 knockouts.
    • Rescue experiments demonstrated that restoring Galpha13 in endothelial cells rescued development and embryonic day 9.5 vascular phenotypes.
    • Galpha13 conventional knockout embryos with rescued Galpha13 expression survived longer but developed intracranial bleeding and exencephaly.

    Conclusions:

    • Galpha13 plays a critical role in endothelial cells during embryonic vascular development.
    • Galpha13 is a potential mediator of PAR1 signaling in the context of vascular development.
    • The study reveals additional roles for Galpha13 in other cell types within the mammalian embryo.