Linked Life Data

19879047

Source:http://linkedlifedata.com/resource/pubmed/id/19879047

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pubmed-article:19879047pubmed:abstractTextBoth cyclooxygenase-1 and -2 are expressed in the spinal cord, and the spinal COX product prostaglandin E(2) (PGE(2)) contributes to the generation of central sensitization upon peripheral inflammation. Vice versa spinal COX inhibition is considered an important mechanism of antihyperalgesic pain treatment. Recently, however, COX-2 was shown to be also involved in the metabolism of endocannabinoids. Because endocannabinoids can have analgesic actions it is conceivable that inhibition of spinal COX produces analgesia not only by inhibition of PG synthesis but also by inhibition of endocannabinoid breakdown. In the present study, we recorded from spinal cord neurons with input from the inflamed knee joint and we measured the spinal release of PGE(2) and the endocannabinoid 2-arachidonoyl glycerol (2-AG) in vivo, using the same stimulation procedures. COX inhibitors were applied spinally. Selective COX-1, selective COX-2 and non-selective COX inhibitors attenuated the generation of spinal hyperexcitability when applied before and during development of inflammation but, when inflammation and spinal hyperexcitability were established, only selective COX-2 inhibitors reversed spinal hyperexcitability. During established inflammation all COX inhibitors reduced release of spinal PGE(2) almost equally but only the COX-2 inhibitor prevented breakdown of 2-AG. The reversal of spinal hyperexcitability by COX-2 inhibitors was prevented or partially reversed by AM-251, an antagonist at the cannabinoid-1 receptor. We conclude that inhibition of spinal COX-2 not only reduces PG production but also endocannabinoid breakdown and provide evidence that reversal of inflammation-evoked spinal hyperexcitability by COX-2 inhibitors is more related to endocannabinoidergic mechanisms than to inhibition of spinal PG synthesis.lld:pubmed
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pubmed-article:19879047pubmed:copyrightInfoCopyright 2009 International Association for the Study of Pain. Published by Elsevier B.V. All rights reserved.lld:pubmed
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pubmed-article:19879047pubmed:articleTitleSpinal antinociceptive effects of cyclooxygenase inhibition during inflammation: Involvement of prostaglandins and endocannabinoids.lld:pubmed
pubmed-article:19879047pubmed:affiliationDepartment of Physiology, University Hospital of Jena, Teichgraben 8, D-07740 Jena, Germany.lld:pubmed
pubmed-article:19879047pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:19879047pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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