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- W2060007746 abstract "The cleavage of haeme by haeme oxygenase (HO) yields carbon monoxide (CO), a biologically active molecule which exerts most of its effects via activation of soluble guanylate cyclase (sGC). In the present study, we tested the hypothesis that endogenous CO could modulate inflammatory hyperalgesia. The intensity of hyperalgesia was investigated in a model of mechanical nociceptor hypersensitivity in rats. The intra-plantar (i.pl.) administration of the HO inhibitor, ZnDPBG (Zinc deuteroporphyrin 2,4-bis glycol), potentiated in a dose-dependent manner the mechanical nociceptor hypersensitivity evoked by i.pl. administration of carrageenan. The mechanical hypersensitivity evoked by i.pl. injection of interleukin-1beta (IL-1beta), tumour necrosis factor-alpha (TNF-alpha), but not interleukin-8 (IL-8), prostaglandin E(2) (PGE(2)) or dopamine, was also enhanced by ZNDPBG: Moreover, the haeme (HO substrate) injection in the paws reduced the hypersensitivity evoked by IL-1beta, but not PGE(2). Furthermore, i.pl. administration of the gas CO reduced the hypersensitivity elicited by PGE(2). The inhibitory effect of haeme and CO upon mechanical nociceptor hypersensitivity were counteracted by a soluble guanylate cyclase (sGC) inhibitor, ODQ (1H-[1,2,4]-oxadiazolo[4,3-a]quinoxalin-1-one), suggesting that this effect of CO is mediated via cyclic GMP. Finally, the inhibitory effect of CO upon mechanical nociceptor hypersensitivity was prevented by the NO synthase blocker, L-NMMA (N(G)-monomethyl L-arginine), suggesting that the impairment of mechanical hypersensitivity elicited by CO depends on the integrity of the NO pathway. In conclusion, the results presented in this paper imply that endogenously CO produced by HO plays an anti-hyperalgesic role in inflamed paws, probably by increasing the intracellular levels of cyclic GMP in the primary afferent neurone." @default.
- W2060007746 created "2016-06-24" @default.
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- W2060007746 creator A5031690868 @default.
- W2060007746 creator A5058314246 @default.
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- W2060007746 date "2001-04-01" @default.
- W2060007746 modified "2023-10-02" @default.
- W2060007746 title "Role of the haeme oxygenase/carbon monoxide pathway in mechanical nociceptor hypersensitivity" @default.
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- W2060007746 doi "https://doi.org/10.1038/sj.bjp.0704014" @default.
- W2060007746 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1572732" @default.
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