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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Vagal afferent fibers and peripheral 5-HT3 receptors mediate cisplatin-induced emesis in dogs.

The involvement of visceral afferent fibers and 5-HT3 receptors in the emesis induced by cisplatin was studied in beagle dogs. The emesis induced by cisplatin (3 mg/kg, i.v.) was inhibited by the intravenous administration of ICS205930 (2 x 0.01 or 2 x 0.1 mg/kg) and MDL72222 (2 x 0.5 mg/kg), 5-HT3 receptor antagonists, but not by the intravenous administration of metoclopramide (2 x 0.5 mg/kg), a dopamine D2 receptor antagonist. The cisplatin-induced emesis was also suppressed by the intravenous administration of para-chlorophenylalanine (300 mg/kg/day for 3 days), an inhibitor of 5-HT synthesis. On the other hand, the administration of ICS205930 into the IVth ventricle (2 x 0.01 mg/animal) had no effects on the cisplatin-induced emesis. The cisplatin-induced emesis was completely inhibited by abdominal vagotomy and splanchnicectomy, but not by splanchnicectomy alone. On the contrary, the emesis induced by apomorphine was suppressed by the intravenous (0.1 mg/kg) or intracerebroventricular (0.05 mg/animal) administration of metoclopramide, but not by visceral nerve section. These results strongly suggest that cisplatin evokes emesis mainly by acting on the vagal afferent terminals through the release of 5-HT and that peripheral 5-HT3 receptors are involved in this action.[1]


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