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• W2160777604 abstract "Inflammatory pain represents an important unmet clinical need with important socioeconomic implications. Ceramide, a potent proinflammatory sphingolipid, has been shown to elicit mechanical hyperalgesia, but the mechanisms remain largely unknown. We now demonstrate that, in addition to mechanical hyperalgesia, intraplantar injection of ceramide (10 μg) led to the development of thermal hyperalgesia that was dependent on induction of the inducible cyclooxygenase (COX-2) and subsequent increase of prostaglandin E2 (PGE2). The development of mechanical and thermal hyperalgesia and increased production of PGE2 was blocked by NS-398 (15-150 ng), a selective COX-2 inhibitor. The importance of the COX-2 to PGE2 pathway in ceramide signaling was underscored by the findings that intraplantar injection of a monoclonal PGE2 antibody (4 μg) blocked the development of hyperalgesia. Our results further revealed that COX-2 induction is regulated by NF-κB and p38 kinase activation, since intraplantar injection of SC-514 (0.1-1 μg) or SB 203580 (1-10 μg), well-characterized inhibitors of NF-κB and p38 kinase activation, respectively, blocked COX-2 induction and increased formation of PGE2 and thermal hyperalgesia in a dose-dependent manner. Moreover, activation of NF-κB was dependent on upstream activation of p38 MAPK, since SB 203580 (10 μg) blocked p65 phosphorylation, whereas p38 kinase phosphorylation was unaffected by NF-κB inhibition by SC-514 (1 μg). Our findings not only provide mechanistic insight into the signaling pathways engaged by ceramide in the development of hyperalgesia, but also provide a potential pharmacological basis for developing inhibitors targeting the ceramide metabolic-to-COX-2 pathway as novel analgesics.—Doyle, T., Chen, Z., Muscoli, C., Obeid, L. M., Salvemini, D. Intraplantar-injected ceramide in rats induces hyperalgesia through an NF-κB- and p38 kinase-dependent cyclooxygenase 2/prostaglandin E2 pathway. FASEB J. 25, 2782-2791 (2011). www.fasebj.org" @default.
• W2160777604 created "2016-06-24" @default.
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• W2160777604 date "2011-05-06" @default.
• W2160777604 modified "2023-09-25" @default.
• W2160777604 title "Intraplantar‐injected ceramide in rats induces hyperalgesia through an NF‐κB‐ and p38 kinase‐dependent cyclooxygenase 2/prostaglandin E₂pathway" @default.
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• W2160777604 doi "https://doi.org/10.1096/fj.10-178095" @default.
• W2160777604 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3136338" @default.
• W2160777604 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21551240" @default.

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