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. 1989 May;97(1):247–255. doi: 10.1111/j.1476-5381.1989.tb11948.x

5-HT3 receptor antagonists injected into the area postrema inhibit cisplatin-induced emesis in the ferret.

G A Higgins 1, G J Kilpatrick 1, K T Bunce 1, B J Jones 1, M B Tyers 1
PMCID: PMC1854462  PMID: 2720310

Abstract

1. The purpose of the present study was to identify and investigate the role of 5-hydroxytryptamine3 (5-HT3) receptors in the area postrema in the control of cisplatin-induced emesis in the ferret. 2. Homogenate binding and autoradiography experiments using the high affinity 5-HT3 receptor ligand, [3H]-GR65630, identified the presence of a high concentration of 5-HT3 receptors in the area postrema of the ferret. 3. Intraperitoneal injection of the 5-HT3 receptor antagonists, GR38032F, GR65630A and MDL72222, at doses of 1, 0.1 and 1 mg kg-1 respectively, inhibited emesis induced by cisplatin, 9 mg kg-1 i.p. 4. Discrete injection of low doses of the 5-HT3 receptor antagonists directly into the area postrema region also inhibited cisplatin-induced (9 mg kg-1 i.p.) emesis. The dose ranges used were: GR38032F, 0.01-1 microgram; GR65630A, 0.001-0.1 microgram; MDL72222, 0.1-10 micrograms. 5. Cisplatin-induced emesis was not inhibited by discrete injection of ketanserin (30 micrograms) or methiothepin (30 micrograms) into the area postrema. Injection of the 5-HT3 receptor agonist, 2-methyl-5-HT, directly into the area postrema produced an incomplete emetic response. 6. These results confirm a role of 5-HT, and in particular 5-HT3 receptors, in the control of cisplatin-induced emesis, and show that at least one functional site for these receptors in modulating the emetic response is the area postrema, the locus of the chemoreceptor trigger zone.

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Selected References

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