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Phenylbiguanide is a 5-HT3 receptor selective agonist with an EC50 of 3.0±0.1 μM.

Phenylbiguanide (1-Phenylbiguanide) is a 5-HT3 receptor selective agonist with pEC50s of 5.57, 4.07, and 4.47 for r5-HT3A(b), h5-HT3A, m5-HT3A(b) , respectively[1]. The effect of Phenylbiguanide (1-Phenylbiguanide hydrochloride) in promoting the growth of the HT29 cell line is investigated. Phenylbiguanide causes a dose dependent proliferation of HT29 cells after 48 hours incubation. The maximum proliferation is at a 5HT concentration of 12.5 μM (P≤0.01). Phenylbiguanide significantly stimulates the growth of cells at concentrations of 3.125 μM (P≤0.05) and 6.25 μM (P≤0.01)[2].

In anaesthetised mice, Phenylbiguanide (PBG), a drug that is known to stimulate cardiopulmonary afferent C-fibres,is injected into the right atrium of the heart and mapped c-Fos expression within specific regions of the central nervous system. Intraatrial injection of PBG produces a reflex cardiorespiratory response including a pronounced bradycardia and a respiratory depression[3].

[1]. Mair ID, et al. Pharmacological characterization of a rat 5-hydroxytryptamine type3 receptor subunit (r5-HT3A(b)) expressed in Xenopus laevis oocytes. Br J Pharmacol. 1998 Aug;124(8):1667-74. [2]. Ataee R, et al. Study of 5HT3 and HT4 receptor expression in HT29 cell line and human colon adenocarcinoma tissues. Arch Iran Med. 2010 Mar;13(2):120-5. [3]. de Vries A, et al. Characterisation of c-Fos expression in the central nervous system of mice following right atrialinjections of the 5-HT3 receptor agonist Phenylbiguanide. Auton Neurosci. 2005 Dec 30;123(1-2):62-75.

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