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Induction of B1 receptors in vivo in a model of persistent inflammatory mechanical hyperalgesia in the rat.
Neuropharmacology 1994 January
The induction of mechanical hyperalgesia by B1 and B2 receptor agonists following an inflammatory insult has been studied in the rat. Intra-articular injection of bradykinin, but not desArg9 bradykinin, into naïve joints induced mechanical hyperalgesia with a reduction of up to 38% in load tolerated by the treated leg. Following intra-articular injection of Freund's complete adjuvant (FCA) the load tolerated by the treated leg was depressed for three days. The development of FCA-induced hyperalgesia was reduced by desArg9Leu8BK or Hoe 140. Bradykinin, desArg9BK and the metabolically stable B1 receptor agonist SarDPhe8desArg9BK were all hyperalgesic upon intra-articular administration 3 days after FCA administration. The hyperalgesia induced by desArg9BK and SarDPhe8desArg9BK was prevented by co-administration of desArg9Leu8BK but not by Hoe 140. At low doses (< 10 nmol) bradykinin-induced hyperalgesia was presented by Hoe 140 but not by desArg9Leu8BK. At higher doses of bradykinin (> 100 nmol) the hyperalgesia was reduced by both Hoe 140 and desArg9Leu8BK. These data suggest that following an inflammatory insult both bradykinin B1 and B2 receptor mechanisms are involved in the accompanying hyperalgesia.
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