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• W1992309009 abstract "Prostaglandins (PGs) formed via the cyclooxygenase (COX) pathway mediate hyperalgesia in sensory nerve endings. To investigate the role of the COX isoforms in pain transmission we recently studied nociception in COX-isozyme-deficient mice using models of “sharp” rapidly transmitted pain (hot-plate) and slowly developing, diffuse pain (writhing) [Ballou L, Botting RM, Goorha S, Zhang J, Vane JR. Nociception in cyclooxygenase isozyme-deficient mice. Proc Natl Acad Sci USA 2000;97:10272]. Our results demonstrated that COX-1 (and not COX-2) was the primary isoform involved in nociception in both model systems. Given the importance of dorsal root ganglia (DRG) in pain transmission we examined the expression patterns of COX-1, -2 and the recently described variant of COX-1 retaining intron-1, originally referred to as “COX-3” but hereafter referred to as COX-1 variant (COX-1v), in mouse L4 or L5 DRG taken from normal and COX-isozyme-deficient mice. Messenger RNA and protein for COX isoforms from DRG, spinal cord as well as, heart, brain, kidney, spleen and skin of adult mice were isolated and analyzed by reverse transcriptase-polymerase chain reaction (RT-PCR) and Western blot analysis, respectively. Patterns of COX-isoform expression were determined using immunohistochemical techniques. We found that COX-1 and COX-1v were both expressed in neurons while COX-2 expression was completely undetectable in the DRG. Immunohistochemical analysis of COX expression in DRG of mice exhibiting the chronic pain and inflammation associated with collagen-induced arthritis (CIA) expressed COX-1 and COX-1v while no COX-2 could be detected. For purposes of comparison, COX-1v mRNA was also expressed in heart, brain, spinal cord, kidney, spleen and skin. Together, these data support a role for COX-1 and perhaps COX-1v, not COX-2, as the primary producers of PGs in mouse DRG in normal and in mice subject to chronic pain and inflammation. These data also suggest potential alternative analgesic mechanisms of action for the newly developed, COX-2 selective inhibitors and the nonsteroidal anti-inflammatory drugs (NSAIDs) in pain transmission in the peripheral nervous system." @default.
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• W1992309009 date "2004-10-01" @default.
• W1992309009 modified "2023-10-13" @default.
• W1992309009 title "Nociception and the differential expression of cyclooxygenase-1 (COX-1), the COX-1 variant retaining intron-1 (COX-1v), and COX-2 in mouse dorsal root ganglia (DRG)" @default.
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• W1992309009 doi "https://doi.org/10.1016/j.prostaglandins.2004.06.001" @default.
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