Ibuprofen blocks changes in Na v 1.7 and 1.8 sodium channels associated with complete Freund's adjuvant-induced inflammation in rat

The Journal of Pain : Official Journal of the American Pain Society
Harry J GouldDennis Paul

Abstract

Although nerve growth factor plays a role in augmenting sodium channel expression in small dorsal root ganglion (DRG) cells, the cytochemical mediators responsible for enhanced expression in large DRG neurons are unknown. To narrow the search for mediators involved in the increased production of sodium channels in large DRG neurons, we examined the effect of cyclooxygenase inhibition on sodium channel production during inflammation. Thirty minutes before the subcutaneous injection of complete Freund's adjuvant (CFA), rats received ibuprofen (nonselective, cyclooxygenase inhibitor), NS-398 (selective, cyclooxygenase inhibitor), or vehicle. Withdrawal thresholds from thermal and mechanical stimulation were measured before and immediately after CFA injection and at selected hourly intervals after injection for the next 24 hours. Sodium channel up-regulation was then examined in DRG by using site-specific, anti-sodium channel antibodies, Na(v) 1.7 and 1.8. Both ibuprofen and NS-398 provided analgesia during the second phase of inflammatory hyperalgesia that begins 3 hours after CFA injection. The up-regulation, predominantly of Na(v) 1.7 and minimally of Na(v) 1.8 channels, seen in vehicle-treated rats was suppressed by both drugs ...Continue Reading

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