Intracellular messengers contributing to persistent nociception and hyperalgesia induced by L-glutamate and substance P in the rat formalin pain model

The European Journal of Neuroscience
T J Coderre, K Yashpal

Abstract

The contribution of the intracellular messengers nitric oxide, arachidonic acid and protein kinase C to persistent nociception in response to tissue injury in rats was examined following the subcutaneous injection of formalin into the hindpaw. Formalin injury-induced nociceptive behaviours were reduced by intrathecal pretreatment with inhibitors of nitric oxide synthase (NG-nitro-L-arginine methyl ester, L-NAME), arachidonic acid (dexamethasone) or protein kinase C [protein kinase C (19-26) and 1-95-(isoquinolinesulphonyl)-2-methylpiperazine dihydrochloride, H-7]. Each of these agents affected the tonic, but not the acute, phase of the formalin response. Furthermore, none of these agents affected mechanical or thermal flexion reflex thresholds in rats not injected with formalin. Conversely, formalin-induced nociceptive responses were enhanced by stimulators of nitric oxide (sodium nitroprusside), arachidonic acid metabolism (arachidonic acid) or protein kinase C [(+/-)-1-oleoyl-2-acetyl-glycerol], and were slightly reduced by inositol trisphosphate. Mechanical flexion reflexes were also reduced by arachidonic acid, while thermal flexion reflexes were reduced after treatment with sodium nitroprusside, arachidonic acid or [(+/-)-...Continue Reading

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