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AM404, an inhibitor of anandamide uptake, prevents pain behaviour and modulates cytokine and apoptotic pathways in a rat model of neuropathic pain.

Abstract：

:An attractive alternative to the use of direct agonists at the cannabinoid receptor type 1 (CB1) in the control of neuropathic pain may be to potentiate the actions of endogenous cannabinoids. Thus, the effects of AM404, an inhibitor of anandamide uptake, were assessed in an experimental model of neuropathic pain in rats. Daily treatment with AM404 prevented, time- and dose-dependently, the development of thermal hyperalgesia and mechanical allodynia in neuropathic rats. Antagonists at cannabinoid CB1 or CB2 receptors, or at the transient receptor potential vanilloid type 1 receptor, each partially reversed effects induced by AM404. A complete reversal was obtained when the three antagonists were given together, suggesting that all three receptors are involved. AM404 treatment affected two pathways involved in the generation and maintenance of neuropathic pain, one mediated by nitric oxide (NO) and the other by cytokines. AM404 completely prevented the overproduction of NO and the overexpression of nNOS, inhibited the increase in tumour necrosis factor alpha (TNFalpha) and enhanced the production of interleukin-10. Both NO and TNFalpha are known to contribute to the apoptotic process, which plays an important role in the establishment of chronic pain states. AM404 treatment prevented the increase in the ratio between pro- and anti-apoptotic gene bax/bcl-2 expression observed in the spinal cord of neuropathic rats. Taken together, these findings suggest that inhibition of endocannabinoid uptake, by blocking the putative anandamide carrier, results in the relief of neuropathic pain and may represent a novel strategy for treating chronic pain.

journal_name

Br J Pharmacol

journal_title

British journal of pharmacology

authors

Costa B,Siniscalco D,Trovato AE,Comelli F,Sotgiu ML,Colleoni M,Maione S,Rossi F,Giagnoni G

doi

10.1038/sj.bjp.0706798

subject

Has Abstract

pub_date

2006-08-01 00:00:00

pages

1022-32

issue

7

eissn

0007-1188

issn

1476-5381

pii

0706798

journal_volume

148

pub_type

杂志文章

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