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• W2051829971 abstract "Peroxynitrite (ONOO(-)), the reaction product of the interaction between superoxide (O(2)(*-)) and nitric oxide (*NO), is a potent proinflammatory and cytotoxic nitrooxidative species. Its role as a mediator of hyperalgesia (clinically defined as an augmented sensitivity to painful stimuli) is not known. In light of the known proinflammatory properties of ONOO(-), our study addressed its potential involvement in the development of hyperalgesia associated with tissue damage and inflammation. Intraplantar injection in rats of the ONOO(-) precursor O(2)(*-) (1 microM) led to the development of thermal hyperalgesia associated with a profound localized inflammatory response. Both events were blocked by L-NAME (N(G)-nitro-L-arginine methyl ester, 3-30 mg/kg), a nitric oxide synthase inhibitor, or by FeTM-4-PyP(5+) [Fe(III)5,10,15,20-tetrakis(N-methylpyridinium-4-yl)porphyrin, 3-30 mg/kg], an ONOO(-) decomposition catalyst. These results suggested that locally synthesized ONOO(-) produced in situ by O(2)(*-) and *NO is key in the development of inflammatory hyperalgesia. The direct link between ONOO(-) and hyperalgesia was further supported by demonstrating that intraplantar injection of soluble ONOO(-) itself (1 microM) similarly led to inflammatory hyperalgesia. ONOO(-) generated by the interaction between exogenous administration of O(2)(*-) and endogenous *NO, or provided by direct injection of ONOO(-), activated the transcription factor NF-kappaB in paw tissues, enhancing expression of the inducible but not the constitutive cyclooxygenase enzyme (COX-2 and COX-1, respectively). ONOO(-)-mediated hyperalgesia was blocked in a dose-dependent manner by intraperitoneal injections of indomethacin (10 mg/kg), a nonselective COX-1/COX-2 inhibitor, or NS398 [N-(2-cyclohexyloxy-4-nitrophenyl)methanesulfonamide; 10 mg/kg] a selective COX-2 inhibitor, as well as by an anti-prostaglandin (PG) E(2) antibody (200 microg). In another established model of inflammation-related hyperalgesia by intraplantar injection of carrageenan in rats, inhibition of ONOO(-) with FeTM-4-PyP(5+) (3-30 mg/kg) inhibited the development of hyperalgesia and the release of PGE(2) in paw tissue exudates. Furthermore, FeTM-4-PyP(5+) synergized with indomethacin and NS397 (1-10 mg/kg) to block both hyperalgesia and edema. Taken together, these data show for the first time that ONOO(-) is a potent mediator of inflammation-derived hyperalgesia operating via the COX-to-PGE(2) pathway. These results provide a pharmacological rationale for the development of inhibitors of peroxynitrite biosynthesis as novel nonnarcotic analgesics. The broad implications of our study are that dual inhibition of both ONOO(-) formation and COX activity may provide an alternative therapeutic approach to the management of pain: effective analgesia with reduced side-effects typically associated with the use of COX inhibitors." @default.
• W2051829971 created "2016-06-24" @default.
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• W2051829971 date "2008-05-22" @default.
• W2051829971 modified "2023-09-23" @default.
• W2051829971 title "Cyclooxygenases 1 and 2 contribute to peroxynitrite‐mediated inflammatory pain hypersensitivity" @default.
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• W2051829971 doi "https://doi.org/10.1096/fj.08-108159" @default.
• W2051829971 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18497304" @default.
• W2051829971 hasPublicationYear "2008" @default.
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