| 12119448 |
Sandrini M, Vitale G, Pini LA: Central antinociceptive activity of acetylsalicylic acid is modulated by brain serotonin receptor subtypes. Pharmacology. 2002 Aug;65(4):193-7.
Male Wistar rats were treated with ondansetron (1 and 2 mg/kg s.c.), ketanserin (0.2, 1 and 5 mg/kg s.c.) or NAN-190 (1, 3 and 5 mg/kg i.p.) 15 min before acetylsalicylic acid (ASA, 400 mg/kg i.p.), and 30 min thereafter the pain threshold was evaluated. The antinociceptive activity of ASA in the hot-plate test was variously affected by ondansetron, ketanserin and NAN-190: at the highest dose (2 mg/kg s.c.) ondansetron abolished it while ketanserin (5 mg/kg s.c.) significantly reduced it, and NAN-190 (1-5 mg/kg) did not significantly modify the effect of ASA. Binding experiments indicate that both ondansetron and ketanserin completely prevented the decrease in the maximum number of 5-HT (2) receptors (B (max)) provoked by ASA. These data indicate that the central antinociceptive activity of ASA is modulated in a different manner by serotonin receptor antagonists, and that 5-HT (2) and 5-HT (3) receptors may exert a pivotal role in nociception, alone or in association. |
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