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Intraplantar (i.pl.) injection of small doses of capsaicin has been shown to produce hyperalgesia and upregulation of the levels of proinflammatory cytokines. The present work aimed at investigating the possible mediation of these effects by sensory neuropeptides and mast cells. Various groups of rats received i.pl. injection of capsaicin alone or preceded by the injection of antagonists to substance...
The sympathetic system (SNS) is considered to be a major component of the neurogenic contribution to inflammation and hyperalgesia. We have investigated the role of the SNS in the local inflammatory pain induced by intraplantar (i.pl) injections of bacterial endotoxin (ET). Treatment of rats with an α-adrenoceptor antagonist (phentolamine, 0.25-1 mg/kg, i.p.), a β-adrenoceptor antagonist (propranolol,...
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