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Neutron diffraction from cannabinoids in phospholipid membranes.

P Martel1, F U Ahmed

  • 1Atomic Energy of Canada Limited, Chalk River Nuclear Laboratories, Ontario, Canada.

Chemistry and Physics of Lipids
|March 1, 1990
PubMed
Summary
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Delta 8 and delta 9-tetrahydrocannabinol (THC) affect phospholipid membranes similarly, suggesting their differing psychoactivity stems from interactions with membrane proteins, not phospholipids.

Area of Science:

  • Membrane biophysics
  • Cannabinoid pharmacology
  • Neutron scattering techniques

Background:

  • Phospholipid bilayers form cell membranes, crucial for cellular function.
  • Tetrahydrocannabinols (THCs) are key cannabinoids with varying psychoactive effects.
  • Understanding THC interaction with membranes is vital for pharmacology.

Purpose of the Study:

  • To investigate the structural effects of delta 8-THC and delta 9-THC on dipalmitoylphosphatidylcholine (DPPC) membranes.
  • To compare the membrane interactions of delta 8-THC and delta 9-THC with those of cholesterol.
  • To elucidate the role of phospholipid interactions in the differential psychoactivity of THC isomers.

Main Methods:

  • Neutron diffraction (low-angle and wide-angle) to analyze membrane structure.

Related Experiment Videos

  • Differential scanning calorimetry (DSC) for thermal analysis of membrane phase transitions.
  • Incorporation of delta 8-THC, delta 9-THC, and cholesterol into DPPC membranes at similar weight percentages.

    • Main Results:

    • Both delta 8-THC and delta 9-THC increased interlamellar spacing, similar to cholesterol.
    • Significant differences were observed in intralamellar structural changes induced by cannabinoids versus cholesterol.
    • Thermal analysis profiles for delta 8-THC and delta 9-THC containing membranes were similar, but distinct from cholesterol-containing membranes.

    Conclusions:

    • Delta 8-THC and delta 9-THC exhibit similar interactions with phospholipid bilayers.
    • The observed differences in psychoactivity between delta 8-THC and delta 9-THC are unlikely to originate from direct phospholipid interactions.
    • Findings suggest that differential interactions with membrane proteins may account for the varying psychoactive effects of these cannabinoids.