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Related Experiment Videos

[Receptor-mediated signal transduction]

T Murayama1

  • 1Department of Pharmacology, Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan.

Yakugaku Zasshi : Journal of the Pharmaceutical Society of Japan
|April 1, 1996
PubMed
Summary

Guanine nucleotide-binding (G) proteins are key regulators of cellular signaling pathways, influencing processes like cyclic AMP production and arachidonic acid release. Pertussis toxin (PTX) disrupts these G protein functions, impacting cell growth and receptor interactions.

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Area of Science:

  • Cellular Biology
  • Molecular Signaling
  • Biochemistry

Background:

  • Receptor-mediated signal transduction is crucial for cellular communication.
  • Cyclic AMP and arachidonic acid (AA) act as intracellular second messengers.
  • Guanine nucleotide-binding (G) proteins link cell surface receptors to intracellular effectors.

Purpose of the Study:

  • To elucidate the mechanism of receptor-mediated signal transduction.
  • To investigate the role of G proteins in regulating adenylyl cyclase activity and AA release.
  • To understand the impact of pertussis toxin (PTX) on G protein function and cellular processes.

Main Methods:

  • Studies on cyclic AMP regulation by membrane adenylyl cyclase.
  • Investigation of G protein involvement (Gs and Gi) in adenylyl cyclase activation/inhibition.

Related Experiment Videos

  • Analysis of islet-activating protein (IAP/PTX) effects on Gi alpha subunit.
  • Examination of arachidonic acid (AA) release mediated by phospholipase A2 (PLA2).
  • Assessment of PTX effects on cytosolic PLA2 activation and fibroblast cell growth.

    • Main Results:

    • Gs and Gi proteins differentially regulate adenylyl cyclase.
    • PTX ADP-ribosylates the Gi alpha subunit, inhibiting its function.
    • Receptor-mediated AA release involves PTX-sensitive G proteins and cytosolic PLA2.
    • PTX treatment inhibits serum and growth factor-induced fibroblast proliferation.
    • G proteins are implicated in receptor-receptor interactions in neuronal cells.

    Conclusions:

    • Cell surface receptor-coupled G proteins play significant regulatory roles in signal transduction pathways.
    • G proteins modulate key cellular functions including second messenger production and cell growth.
    • PTX serves as a valuable tool for dissecting G protein-mediated signaling.