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More surprises lying ahead. The endocannabinoids keep us guessing.

Daniele Piomelli1

  • 1Department of Anatomy and Neurobiology, University of California, Irvine, CA 92697-1275, USA; Department of Pharmacology, University of California, Irvine, CA 92697-1275, USA; Department of Drug Discovery and Development, Istituto Italiano di Tecnologia, Genoa 16163, Italy; Department of Biological Chemistry, University of California, Irvine, CA 92697-1275, USA.

Neuropharmacology
|August 20, 2013
PubMed
Summary

Endogenous cannabinoids, like anandamide and 2-arachidonoylglycerol (2-AG), are crucial signaling molecules. Key questions remain about their formation, pathways, and roles in brain function and drug actions.

Keywords:
AnandamideCannabinoid receptorCocaineDrugs of abuseEndocannabinoid

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Pharmacology

Background:

  • Endogenous cannabinoids are lipid-derived signaling molecules activating CB1 receptors.
  • They play vital roles in motivation, emotion, and energy balance.
  • Anandamide and 2-arachidonoylglycerol (2-AG) are key endocannabinoids.

Purpose of the Study:

  • To highlight unknown aspects of endogenous cannabinoid signaling.
  • To review current knowledge and identify research gaps regarding anandamide and 2-AG.
  • To discuss the implications for understanding brain function and drug abuse.

Main Methods:

  • Literature review of endogenous cannabinoid research.
  • Analysis of established and proposed molecular mechanisms.
  • Discussion of synaptic roles and regulatory pathways.

Main Results:

  • Anandamide's formation and neural pathways remain largely unknown.
  • Fatty acid amide hydrolase (FAAH) is implicated but likely not the sole enzyme in anandamide deactivation.
  • The 2-AG signalosome's composition and regulation are under investigation.
  • 2-AG acts as a retrograde messenger at excitatory synapses.
  • The role of 2-AG in drug actions like THC and cocaine requires further study.

Conclusions:

  • Significant gaps exist in understanding anandamide's molecular regulation and function.
  • The 2-AG signalosome is a key complex, but its precise nature and regulation need elucidation.
  • Further research is crucial for understanding endocannabinoid roles in neural activity and addiction.