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Inhibitors of arachidonoyl ethanolamide hydrolysis
B Koutek1, G D Prestwich, A C Howlett
1Department of Chemistry, State University of New York, Stony Brook 11794.
The Journal of Biological Chemistry
|September 16, 1994
Summary
Researchers developed novel inhibitors to block anandamide hydrolysis, a key process in the brain. These compounds, particularly trifluoromethyl ketones, effectively inhibit anandamide degradation and may help study anandamide's role in vivo.
Area of Science:
- Biochemistry
- Neuroscience
- Pharmacology
Background:
- Arachidonoyl ethanolamide (anandamide) is an endogenous cannabinoid receptor (CBR1) ligand found in the brain.
- Anandamide is rapidly degraded by anandamide amidase in brain membranes and neuroblastoma cells.
Purpose of the Study:
- To synthesize and evaluate analogs of anandamide as inhibitors of anandamide hydrolysis.
- To investigate these analogs as ligands for the cannabinoid receptor 1 (CBR1).
Main Methods:
- Synthesis of three classes of putative transition-state inhibitors: trifluoromethyl ketones, alpha-keto esters, and alpha-keto amides.
- In vitro testing of inhibitors against anandamide hydrolysis and CBR1 binding.
- Evaluation of inhibitor efficacy in intact neuroblastoma cells.
Main Results:
- Trifluoromethyl ketones and alpha-keto esters achieved nearly 100% inhibition of anandamide hydrolysis at low micromolar concentrations.
- Arachidonyl trifluoromethyl ketone selectively displaced [3H]CP-55940 binding to CBR1 (Ki = 0.65 microM).
- Arachidonyl trifluoromethyl ketone significantly increased cellular anandamide levels in neuroblastoma cells.
Conclusions:
- Anandamide hydrolysis likely involves an active-site serine hydroxyl group, as suggested by inhibitor actions.
- The developed inhibitors are effective tools for studying anandamide's in vivo functions.
- Novel anandamide analogs show promise for further research into endocannabinoid signaling pathways.