A catalytically silent FAAH-1 variant drives anandamide transport in neurons

Nat Neurosci. 2011 Nov 20;15(1):64-9. doi: 10.1038/nn.2986.

Abstract

The endocannabinoid anandamide is removed from the synaptic space by a selective transport system, expressed in neurons and astrocytes, that remains molecularly uncharacterized. Here we describe a partly cytosolic variant of the intracellular anandamide-degrading enzyme fatty acid amide hydrolase-1 (FAAH-1), termed FAAH-like anandamide transporter (FLAT), that lacked amidase activity but bound anandamide with low micromolar affinity and facilitated its translocation into cells. Known anandamide transport inhibitors, such as AM404 and OMDM-1, blocked these effects. We also identified a competitive antagonist of the interaction of anandamide with FLAT, the phthalazine derivative ARN272, that prevented anandamide internalization in vitro, interrupted anandamide deactivation in vivo and exerted profound analgesic effects in rodent models of nociceptive and inflammatory pain, which were mediated by CB(1) cannabinoid receptors. The results identify FLAT as a critical molecular component of anandamide transport in neural cells and a potential target for therapeutic drugs.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amidohydrolases / genetics
  • Amidohydrolases / metabolism*
  • Animals
  • Arachidonic Acids / metabolism*
  • Arachidonic Acids / pharmacology
  • Benzyl Compounds / pharmacology
  • Endocannabinoids
  • Neurons / drug effects
  • Neurons / metabolism*
  • Polyunsaturated Alkamides / metabolism*
  • Protein Transport / drug effects
  • Protein Transport / physiology
  • Rats

Substances

  • Arachidonic Acids
  • Benzyl Compounds
  • Endocannabinoids
  • OMDM-1 cpd
  • Polyunsaturated Alkamides
  • Amidohydrolases
  • fatty-acid amide hydrolase
  • anandamide
  • N-(4-hydroxyphenyl)arachidonylamide