Document Detail

Inhibition of fatty acid amide hydrolase and monoacylglycerol lipase by the anandamide uptake inhibitor VDM11: evidence that VDM11 acts as an FAAH substrate.
MedLine Citation:
PMID:  15895107     Owner:  NLM     Status:  MEDLINE    
There is some dispute concerning the extent to which the uptake inhibitor VDM11 (N-(4-hydroxy-2-methylphenyl) arachidonoyl amide) is capable of inhibiting the metabolism of the endocannabinoid anandamide (AEA) by fatty acid amide hydrolase (FAAH). In view of a recent study demonstrating that the closely related compound AM404 (N-(4-hydroxyphenyl)arachidonylamide) is a substrate for FAAH, we re-examined the interaction of VDM11 with FAAH. In the presence of fatty acid-free bovine serum albumin (BSA, 0.125% w v(-1)), both AM404 and VDM11 inhibited the metabolism of AEA by rat brain FAAH with similar potencies (IC(50) values of 2.1 and 2.6 microM, respectively). The compounds were about 10-fold less potent as inhibitors of the metabolism of 2-oleoylglycerol (2-OG) by cytosolic monoacylglycerol lipase (MAGL). The potency of VDM11 towards FAAH was dependent upon the assay concentration of fatty acid-free bovine serum albumin (BSA). Thus, in the absence of fatty acid-free BSA, the IC(50) value for inhibition of FAAH was reduced by a factor of about two (from 2.9 to 1.6 microM). A similar reduction in the IC(50) value for the inhibition of membrane bound MAGL by both this compound (from 14 to 6 microM) and by arachidonoyl serinol (from 24 to 13 microM) was seen. An HPLC assay was set up to measure 4-amino-m-cresol, the hypothesised product of FAAH-catalysed VDM11 hydrolysis. 4-Amino-m-cresol was eluted with a retention time of approximately 2.4 min, but showed a time-dependent degradation to compounds eluting at peaks of approximately 5.6 and approximately 8 min. Peaks with the same retention times were also found following incubation of the membranes with VDM11, but were not seen when the membranes were preincubated with the FAAH inhibitors URB597 (3'-carbamoyl-biphenyl-3-yl-cyclohexylcarbamate) and CAY10401 (1-oxazolo[4,5-b]pyridin-2-yl-9-octadecyn-1-one) prior to addition of VDM11. The rate of metabolism of VDM11 was estimated to be roughly 15-20% of that for anandamide. It is concluded that VDM11 is an inhibitor of FAAH under the assay conditions used here, and that the inhibition may at least in part be a consequence of the compound acting as an alternative substrate.
Séverine Vandevoorde; Christopher J Fowler
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Publication Detail:
Type:  Comparative Study; In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  British journal of pharmacology     Volume:  145     ISSN:  0007-1188     ISO Abbreviation:  Br. J. Pharmacol.     Publication Date:  2005 Aug 
Date Detail:
Created Date:  2005-08-01     Completed Date:  2006-01-17     Revised Date:  2013-06-09    
Medline Journal Info:
Nlm Unique ID:  7502536     Medline TA:  Br J Pharmacol     Country:  England    
Other Details:
Languages:  eng     Pagination:  885-93     Citation Subset:  IM    
Department of Pharmacology and Clinical Neuroscience, Umeå University, SE-901 87 Umeå, Sweden.
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MeSH Terms
Amidohydrolases / antagonists & inhibitors*
Arachidonic Acids / antagonists & inhibitors,  metabolism,  pharmacology*
Brain / drug effects*,  enzymology,  metabolism
Cannabinoid Receptor Modulators / metabolism
Inhibitory Concentration 50
Monoacylglycerol Lipases / antagonists & inhibitors*
Polyunsaturated Alkamides
Radioligand Assay
Serum Albumin, Bovine / pharmacology
Reg. No./Substance:
0/Arachidonic Acids; 0/Cannabinoid Receptor Modulators; 0/Endocannabinoids; 0/N-(2-methyl-3-hydroxyphenyl)-5,8,11,14-eicosatetraenamide; 0/N-(4-hydroxyphenyl)arachidonylamide; 0/Polyunsaturated Alkamides; 0/Serum Albumin, Bovine; 94421-68-8/anandamide; EC Lipases; EC 3.5.-/Amidohydrolases; EC 3.5.1.-/fatty-acid amide hydrolase

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