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1-(m-Chlorophenyl)-biguanide, a potent high affinity 5-HT3 receptor agonist

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Abstract

1-(m-Chlorophenyl)-biguanide (mCPBG) was examined and compared with three 5-HT3 receptor agonists in three 5-HT3 receptor models. mCPBG inhibited [3H]GR67330 binding to 5-HT3 receptors with high affinity (IC50 1.5 nM). mCPBG depolarized the rat vagus nerve with an EC50 one tenth of that for 5-HT (0.05 vs. 0.46 μM); the maximum depolarization was approximately half that for 5-HT. The mCPBG depolarization was potently blocked by the selective 5-HT3 antagonist, ondansetron (pKB 8.6 ± 0.1). In anaesthetised cats, mCPBG potently evoked the Bezold- Jarisch reflex which was blocked by low doses of ondansetron (10 μg/kg i.v.). It is concluded that mCPBG is a potent, high affinity 5-HT3 receptor agonist.

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