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Jpn J Pharmacol. 1998 Dec; 78(4): 511-4.

Serotonin receptor subtypes involved in modulation of electrical acupuncture.

Takagi J, Yonehara N.

Department of Dental Anesthesiology, Osaka University Faculty of Dentistry, Suita, Japan.

We examined the effects of intravenous injection of several serotonin (5-HT) antagonists on the inhibitory action of electro-acupuncture (EAP) against the nociceptive responses in the trigeminal nucleus caudalis in rabbits. The inhibitory effect of EAP was suppressed by pindolol, methysergide and ICS 205-930, whereas NAN-190 and ketanserin amplified the EAP effect. These results suggest that 5-HT1, except 5-HT1A; 5-HT2, except 5-HT2A; and 5-HT3 receptors are positively involved in EAP-induced analgesia, whereas the activation of 5-HT1A and 5-HT2A receptors suppressively act on EAP-induced analgesia.

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