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Related Experiment Videos

Endothelin-B receptors activate Galpha13.

K Kitamura1, N Shiraishi, W D Singer

  • 1Fourth Department of Internal Medicine, Kumamoto University, Kumamoto, Japan.

The American Journal of Physiology
|April 13, 1999
PubMed
Summary
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Endothelin ETB receptors activate Galpha13 proteins, influencing cellular signaling pathways. This study demonstrates a direct link between ETB receptor activation and Galpha13 protein function.

Area of Science:

  • Molecular Biology
  • Cellular Signaling
  • G Protein-Coupled Receptors

Background:

  • Endothelin (ET) receptors are known to activate various G proteins, including Gi, Gq, and Gs families.
  • Galpha13 proteins mediate complex cellular effects that overlap with ET signaling.
  • The specific interaction between ET receptors and the Galpha12/13 family, particularly Galpha13, requires further elucidation.

Purpose of the Study:

  • To investigate the ability of Endothelin (ET) receptors to activate Galpha13 proteins.
  • To characterize the specificity of the interaction between ET receptors and Galpha13.

Main Methods:

  • Utilized a trypsinization assay to measure G protein alpha-chain activation, distinguishing between active (GTP-bound) and inactive (GDP-bound) states.
  • Employed nonhydrolyzable guanine nucleotides and AlMgF to stabilize activated Galpha13 and protect it from trypsin degradation.

Related Experiment Videos

  • Coexpressed ETB receptors and Galpha13 in human embryonic kidney 293 cells for experimental analysis.

    • Main Results:

    • ET-3 stimulation, in the presence of Gpp(NH)p, significantly increased Galpha13 protection from trypsin compared to Gpp(NH)p alone, indicating ETB receptor-mediated Galpha13 activation.
    • Specificity was confirmed as beta2 receptors with isoproterenol and ETA receptors with ET-1 did not activate Galpha13.
    • A specific ETB receptor antagonist abolished ET-3-induced Galpha13 activation, confirming the selective coupling.

    Conclusions:

    • Endothelin ETB receptors directly activate Galpha13 proteins.
    • This finding expands the known signaling pathways regulated by Endothelin receptors, highlighting a specific role for the Galpha12/13 family.
    • The study provides evidence for selective receptor-G protein coupling beyond the classical Gi, Gq, and Gs families.