Abstract:
:Effects of the alpha2-adrenoceptor antagonist yohimbine on the antinociception produced by a low dose of naloxone were examined in a rat model of carrageenan-induced inflammation. In rats receiving saline prior to naloxone injection, the low dose of naloxone (5 microg/kg, i.p.) significantly prolonged paw withdrawal latency in response to noxious thermal stimuli for both the inflamed and the non-inflamed paws 4 h after carrageenan injection (6.0 mg in 0.15 ml saline). In rats receiving yohimbine, the low dose of naloxone failed to produce prolongation of paw withdrawal latencies 4 h after carrageenan, whereas naloxone produced antinociception 7 days after carrageenan. The results suggest that noradrenergic mechanisms are involved in naloxone-induced antinociception only in the early phase of carrageenan-induced inflammation.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Tsuruoka M,Hiruma Y,Matsutani K,Matsui Ydoi
10.1016/s0014-2999(98)00151-4subject
Has Abstractpub_date
1998-05-08 00:00:00pages
161-5issue
2-3eissn
0014-2999issn
1879-0712pii
S0014-2999(98)00151-4journal_volume
348pub_type
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