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Related Experiment Videos

Psychoactive cannabinoids and membrane signaling.

Gabriel G Nahas1, David J Harvey, Kenneth M Sutin

  • 1Department of Anesthesiology, New York University Medical Center, 550 First Avenue, New York, NY, USA 10016.

Human Psychopharmacology
|October 31, 2002
PubMed
Summary

Tetrahydrocannabinol (THC) disrupts cell membranes and G protein-coupled receptors (GPCRs), impacting cellular signaling. This mechanism differs from its direct receptor binding, leading to impaired cellular function in vital organs.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Tetrahydrocannabinol (THC) and related cannabinoids interact with cell membranes.
  • Cannabinoids influence the physicochemical properties of lipid bilayers.
  • This interaction affects membrane-bound signaling pathways.

Purpose of the Study:

  • To elucidate the mechanism of action of THC-like cannabinoids at the cellular level.
  • To differentiate the effects of THC on membrane properties versus direct receptor binding.
  • To understand the role of natural ligands like anandamide (AEA) and 2-arachidonoylglycerol (2-AG) in cellular signaling.

Main Methods:

  • Analysis of cannabinoid interaction with lipid bilayers.
  • Investigation of cannabinoid effects on phospholipase activity and arachidonic acid production.

Related Experiment Videos

  • Examination of cannabinoid binding to G protein-coupled receptors (GPCRs) in comparison to natural ligands.
  • Assessment of allosteric modulation of neurotransmitter receptor function.

    • Main Results:

    • THC permeates lipid bilayers, altering membrane properties and increasing arachidonic acid production.
    • THC binds to GPCRs with higher affinity than AEA and 2-AG.
    • THC alters membrane receptor function allosterically, not through direct interaction.
    • AEA and 2-AG are proposed signaling molecules regulating membrane receptor activity.

    Conclusions:

    • THC's mechanism involves membrane physicochemical alteration and allosteric modulation of GPCRs.
    • This differs from direct binding and impacts fundamental cellular signaling.
    • THC disrupts cellular functions in the brain, heart, and gonads.
    • AEA and 2-AG are distinct from xenobiotic 'endogenous cannabinoids' and play a physiological regulatory role.