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Segregation of two endocannabinoid-hydrolyzing enzymes into pre- and postsynaptic compartments in the rat hippocampus, cerebellum and amygdala

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Gulyas, A. I., Cravatt, B. F., Bracey, M. H., Dinh, T. P., Piomelli, D., Boscia, F., Freund, T. F.·2004·European Journal of Neuroscience

Abstract

Fatty acid amide hydrolase (FAAH) and monoglyceride lipase (MGL) catalyse the hydrolysis of the endocannabinoids anandamide and 2-arachidonoyl glycerol. We investigated their ultrastructural distribution in brain areas where the localization and effects of cannabinoid receptor activation are known. In the hippocampus, FAAH was present in somata and dendrites of principal cells, but not in interneurons. It was located mostly on the membrane surface of intracellular organelles known to store Ca(2+) (e.g. mitochondria, smooth endoplasmic reticulum), less frequently on the somatic or dendritic plasma membrane. MGL immunoreactivity was found in axon terminals of granule cells, CA3 pyramidal cells and some interneurons. In the cerebellum, Purkinje cells and their dendrites are intensively immunoreactive for FAAH, together with a sparse axon plexus at the border of the Purkinje cell/granule cell layers. Immunostaining for MGL was complementary, the axons in the molecular layer were intensively labelled leaving the Purkinje cell dendrites blank. FAAH distribution in the amygdala was similar to that of the CB(1) cannabinoid receptor: evident signal in neuronal somata and proximal dendrites in the basolateral nucleus, and hardly any labelling in the central nucleus. MGL staining was restricted to axons in the neuropil, with similar relative signal intensities seen for FAAH in different nuclei. Thus, FAAH is primarily a postsynaptic enzyme, whereas MGL is presynaptic. FAAH is associated with membranes of cytoplasmic organelles. The differential compartmentalization of the two enzymes suggests that anandamide and 2-AG signalling may subserve functional roles that are spatially segregated at least at the stage of metabolism.

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Crossref · 10.1111/j.1460-9568.2004.03428.x

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  • Following synthesis, ECBs are retrogradely transported into the extracellular space to bind ECB receptors present on presynaptic terminals.

    “Following their synthesis, ECBs are retrogradely transported into the extracellular space to bind ECB receptors present on presynaptic terminals [19–21].”
  • Within amygdala subnuclei, FAAH is highly expressed on pyramidal neurons in the BLA, and to a significantly lesser extent in the central nucleus (CeA).

    “Within amygdala subnuclei, FAAH is highly expressed on pyramidal neurons in the BLA, and to a significantly lesser extent in the central nucleus (CeA) [19,20,46,47].”

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Authors
Gulyas, A. I., Cravatt, B. F., Bracey, M. H., Dinh, T. P., Piomelli, D., Boscia, F., & Freund, T. F.
Affiliations
  • Scripps Research Institute (US)
  • University of California, Irvine (US)
  • University of Naples Federico II (IT)
  • HUN-REN Institute of Experimental Medicine (HU)
Venue
European Journal of Neuroscience
Publisher
Wiley
Published
2004-06-10
Volume
20
Issue
2
Pages
441-458
ISSN
  • 0953-816X (ISSN-L)
  • 1460-9568
OpenAlex
W2052329951
Cited by
561
References
44
Citations by year
2026: 5 · 2025: 12 · 2024: 8 · 2023: 12 · 2022: 24 · 2021: 25 · 2020: 18 · 2019: 19 · 2018: 19 · 2017: 26 · 2016: 30 · 2015: 40 · 2014: 30 · 2013: 23 · 2012: 30
FWCI
21.14
Type
journal article
Language
en
Open access
Locations
  • European Journal of Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
Funders
  • National Institute of Mental Health (MH54671)
  • National Institute on Drug Abuse (R01DA013173, DA 15197, DA 13173, R01DA015197, R01DA012447, DA12447, DA-12493)
  • National Institute of Neurological Disorders and Stroke (NS30549)
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Eicosanoids and Hypertension Pharmacology
Keywords
fatty acid amide hydrolase, monoglyceride lipase, anandamide, 2-arachidonoylglycerol, presynaptic localization, postsynaptic localization, hippocampus, cerebellum, amygdala, Purkinje cells, axon terminals, mitochondria, smooth endoplasmic reticulum, CB1 receptor, ultrastructural localization
MeSH terms
Fatty Acid Amide Hydrolases, Amidohydrolases, Amygdala, Animals, Cerebellum, Cholecystokinin, Fluorescent Antibody Technique, Glutamate Decarboxylase, Hippocampus, Isoenzymes, Male, Monoacylglycerol Lipases, Parvalbumins, Synapses, Microscopy, Immunoelectron, Rats, Wistar, Presynaptic Terminals, Mice, Knockout, Mice, Rats, Calbindins, S100 Calcium Binding Protein G, Calbindin 2

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