pubmed-article:17997230 | rdf:type | pubmed:Citation | lld:pubmed |
pubmed-article:17997230 | lifeskim:mentions | umls-concept:C0242402 | lld:lifeskim |
pubmed-article:17997230 | lifeskim:mentions | umls-concept:C0035820 | lld:lifeskim |
pubmed-article:17997230 | lifeskim:mentions | umls-concept:C0066908 | lld:lifeskim |
pubmed-article:17997230 | lifeskim:mentions | umls-concept:C0851285 | lld:lifeskim |
pubmed-article:17997230 | lifeskim:mentions | umls-concept:C1705241 | lld:lifeskim |
pubmed-article:17997230 | lifeskim:mentions | umls-concept:C0439097 | lld:lifeskim |
pubmed-article:17997230 | lifeskim:mentions | umls-concept:C0205224 | lld:lifeskim |
pubmed-article:17997230 | lifeskim:mentions | umls-concept:C1547348 | lld:lifeskim |
pubmed-article:17997230 | pubmed:issue | 4 | lld:pubmed |
pubmed-article:17997230 | pubmed:dateCreated | 2007-12-17 | lld:pubmed |
pubmed-article:17997230 | pubmed:abstractText | Analgesic effects of delta opioid receptor (DOR) -selective agonists are enhanced during persistent inflammation and arthritis. Although the underlying mechanisms are still unknown, membrane density of DOR was shown to be increased 72 h after induction of inflammation, an effect abolished in mu opioid receptor (MOR) -knockout (KO) mice [Morinville A, Cahill CM, Kieffer B, Collier B, Beaudet A (2004b) Mu-opioid receptor knockout prevents changes in delta-opioid receptor trafficking induced by chronic inflammatory pain. Pain 109:266-273]. In this study, we demonstrated a crucial role of MOR in DOR-mediated antihyperalgesia. Intrathecal administration of the DOR selective agonist deltorphin II failed to induce antihyperalgesic effects in MOR-KO mice, whereas it dose-dependently reversed thermal hyperalgesia in wild-type mice. The antihyperalgesic effects of deltorphin II were blocked by naltrindole but not d-Phe-Cys-Tyr-D-Trp-Orn-Thr-Pen-Thr-NH(2) (CTOP) suggesting that this agonist was mainly acting through DOR. SNC80-induced antihyperalgesic effects in MOR-KO mice were also attenuated as compared with littermate controls. In contrast, kappa opioid receptor knockout did not affect deltorphin II-induced antihyperalgesia. As evaluated using mice lacking endogenous opioid peptides, the regulation of DOR's effects was also independent of beta-endorphin, enkephalins, or dynorphin opioids known to be released during persistent inflammation. We therefore conclude that DOR-mediated antihyperalgesia is dependent on MOR expression but that activation of MOR by endogenous opioids is probably not required. | lld:pubmed |
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