Inhibition of fatty acid amide hydrolase produces analgesia by multiple mechanisms

British Journal of Pharmacology
Leon ChangMichael Webb

Abstract

1 The reversible fatty acid amide hydrolase (FAAH) inhibitor OL135 reverses mechanical allodynia in the spinal nerve ligation (SNL) and mild thermal injury (MTI) models in the rat. The purpose of this study was to investigate the role of the cannabinoid and opioid systems in mediating this analgesic effect. 2 Elevated brain concentrations of anandamide (350 pmol g(-1) of tissue vs 60 pmol g(-1) in vehicle-treated controls) were found in brains of rats given OL135 (20 mg kg(-1)) i.p. 15 min prior to 20 mg kg(-1) i.p. anandamide. 3 Predosing rats with OL135 (2-60 mg kg(-1) i.p.) 30 min before administration of an irreversible FAAH inhibitor (URB597: 0.3 mg kg(-1) intracardiac) was found to protect brain FAAH from irreversible inactivation. The level of enzyme protection was correlated with the OL135 concentrations in the same brains. 4 OL135 (100 mg kg(-1) i.p.) reduced by 50% of the maximum possible efficacy (MPE) mechanical allodynia induced by MTI in FAAH(+/+)mice (von Frey filament measurement) 30 min after dosing, but was without effect in FAAH(-/-) mice. 5 OL135 given i.p. resulted in a dose-responsive reversal of mechanical allodynia in both MTI and SNL models in the rat with an ED(50) between 6 and 9 mg kg(-1). The plasma...Continue Reading

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