Evidence for the participation of the nitric oxide-cyclic GMP pathway in the antinociceptive effect of nimesulide - PubMed
Evidence for the participation of the nitric oxide-cyclic GMP pathway in the antinociceptive effect of nimesulide
M Islas-Cadena et al. J Pharmacol Toxicol Methods. 1999 Oct.
Abstract
The involvement of the nitric oxide-cyclic GMP pathway in the peripheral antinociception induced by the COX-2 preferential inhibitor nimesulide was assessed by using the formalin test in the rat. Intraplantar administration of nimesulide in the formalin-injured paw produced a significant antinociceptive effect that was due to a local action, because nimesulide administration in the contralateral paw was ineffective. Local pretreatment of the paws with saline or N(G)-D-nitro-arginine methyl ester (D-NAME, the inactive isomer of L-NAME) did not affect the antinociception produced by nimesulide. However, local administration of L-NAME (a nitric oxide synthesis inhibitor) or 1H-(1,2,4)-oxadiazolo(4, 2-a)quinoxalin-1-one (ODQ, a soluble guanylyl cyclase inhibitor) blocked the effect of nimesulide. Moreover, the antinociceptive effect of local nimesulide was potentiated by the coadministration of 3-morpholino-sydnonimine-HCl (SIN-1, a nitric oxide donor). It is concluded that nimesulide produces antinociception by a peripheral mechanism of action requiring activation of the nitric oxide-cyclic GMP pathway at the local level.
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