Enzymatic machinery for endocannabinoid biosynthesis associated with calcium stores in glutamatergic axon terminals

Rita Nyilas, Barna Dudok, Gabriella M. Urbán, Ken Mackie, Masahiko Watanabe, Benjamin F. Cravatt, Tamás F. Freund, István Katona

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

Endocannabinoids are regarded as retrograde signaling molecules at various types of synapses throughout the CNS. The lipid derivatives anandamide and 2-arachidonoylglycerol (2-AG) are generally thought to be the key molecular players in this process. Previous anatomical and electrophysiological studies provided compelling evidence that the biosynthetic enzyme of 2-AG is indeed localized in the postsynaptic plasma membrane, whereas its target, the CB 1 cannabinoid receptor, and the enzyme responsible for its inactivation are both found presynaptically. This molecular architecture of 2-AG signaling is a conserved feature of most synapses and supports the retrograde signaling role of 2-AG. Conversely, the molecular and neuroanatomical organization of synaptic anandamide signaling remains largely unknown. In contrast to its predicted role in retrograde signaling, here we show that N-acylphosphatidylethanolamine-hydrolyzing phospholipase D (NAPE-PLD), a biosynthetic enzyme of anandamide and its related bioactive congeners, the N-acylethanolamines (NAEs), is concentrated presynaptically in several types of hippocampal excitatory axon terminals. Furthermore, high-resolution quantitative immunogold labeling demonstrates that this calcium-sensitive enzyme is localized predominantly on the intracellular membrane cisternae of axonal calcium stores. Finally, the highest density of NAPE-PLD is found in mossy terminals of granule cells, which do not express CB1 receptors. Together, these findings suggest that anandamide and related NAEs are also present at glutamatergic synapses, but the sites of their synthesis and action are remarkably different from 2-AG, indicating distinct physiological roles for given endocannabinoids in the regulation of synaptic neurotransmission and plasticity.

Original languageEnglish
Pages (from-to)1058-1063
Number of pages6
JournalJournal of Neuroscience
Volume28
Issue number5
DOIs
Publication statusPublished - Jan 30 2008

Keywords

  • Anandamide
  • Calcium store
  • Cannabinoid
  • Glutamatergic synapse
  • Mossy terminal
  • NAPE-PLD

ASJC Scopus subject areas

  • Neuroscience(all)

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