Cited by 1,373Cannabis and Cannabinoid ResearchNeuroscience and Neuropharmacology ResearchEicosanoids and Hypertension Pharmacology

Brain monoglyceride lipase participating in endocannabinoid inactivation

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Dinh, T. P., Carpenter, D., Leslie, F. M., Freund, T. F., Katona, I., Sensi, S. L., Kathuria, S., Piomelli, D.·2002·Proceedings of the National Academy of Sciences

Abstract

The endogenous cannabinoids (endocannabinoids) are lipid molecules that may mediate retrograde signaling at central synapses and other forms of short-range neuronal communication. The monoglyceride 2-arachidonoylglycerol (2-AG) meets several criteria of an endocannabinoid substance: ( i ) it activates cannabinoid receptors; ( ii ) it is produced by neurons in an activity-dependent manner; and ( iii ) it is rapidly eliminated. 2-AG inactivation is only partially understood, but it may occur by transport into cells and enzymatic hydrolysis. Here we tested the hypothesis that monoglyceride lipase (MGL), a serine hydrolase that converts monoglycerides to fatty acid and glycerol, participates in 2-AG inactivation. We cloned MGL by homology from a rat brain cDNA library. Its cDNA sequence encoded for a 303-aa protein with a calculated molecular weight of 33,367 daltons. Northern blot and in situ hybridization analyses revealed that MGL mRNA is heterogeneously expressed in the rat brain, with highest levels in regions where CB 1 cannabinoid receptors are also present (hippocampus, cortex, anterior thalamus, and cerebellum). Immunohistochemical studies in the hippocampus showed that MGL distribution has striking laminar specificity, suggesting a presynaptic localization of the enzyme. Adenovirus-mediated transfer of MGL cDNA into rat cortical neurons increased MGL expression and attenuated N -methyl-D-aspartate/carbachol-induced 2-AG accumulation in these cells. No such effect was observed on the accumulation of anandamide, another endocannabinoid lipid. The results suggest that hydrolysis by means of MGL is a primary mechanism for 2-AG inactivation in intact neurons.

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  1. [35]Piomelli, D., Beltramo, M., Glasnapp, S., Lin, S. Y., Goutopoulos, A., Xie, X. Q. & Makriyannis, A. (1999) Proc. Natl. Acad. Sci. USA 96, 5802-5807.

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Authors
Dinh, T. P., Carpenter, D., Leslie, F. M., Freund, T. F., Katona, I., Sensi, S. L., Kathuria, S., & Piomelli, D.
Affiliations
University of California, Irvine (US)
Venue
Proceedings of the National Academy of Sciences
Published
2002-07-22
Volume
99
Issue
16
Pages
10819-10824
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2141551684
Cited by
1,373
References
40
Citations by year
2026: 27 · 2025: 45 · 2024: 41 · 2023: 29 · 2022: 63 · 2021: 62 · 2020: 63 · 2019: 46 · 2018: 47 · 2017: 50 · 2016: 60 · 2015: 70 · 2014: 77 · 2013: 56 · 2012: 73
FWCI
26.23
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
Funders
  • Howard Hughes Medical Institute
  • Lunds Universitet
  • U.S. Public Health Service (12447)
  • National Institute on Aging (AG00096, AG 00919, K01AG000919, T32AG000096)
  • National Institute on Drug Abuse (R01DA012447)
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
monoglyceride lipase, 2-arachidonoylglycerol, endocannabinoids, CB1 receptor, retrograde signaling, hippocampus, anandamide, serine hydrolases
MeSH terms
Amino Acid Sequence, Animals, Arachidonic Acids, Base Sequence, Brain, Cannabinoids, Cells, Cultured, Chlorocebus aethiops, Glycerides, HeLa Cells, Humans, Hydrolysis, Molecular Sequence Data, Monoacylglycerol Lipases, Neurons, Gene Expression, Rats, Wistar, DNA, Complementary, COS Cells, Rats, Polyunsaturated Alkamides, Cannabinoid Receptor Modulators, Endocannabinoids

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