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F-15599 is a highly selective G-protein biased 5-HT1A receptor agonist, with Ki of 3.4 nM.

F15599 (0.06 or 0.12 mg/kg) significantly reduces l-DOPA-induced dyskinesia (LID), without affecting motor performance of rats. Rats treated with F15599 manifest less LID and mild 5-HT syndrome with the high dose of 30 μg/μL[1]. F15599 (0.0625, 0.125, 0.25, 0.5 and 1.0 mg/kg, i,p,) results in a significant and dose-dependent (MED = 0.125 mg/kg) delay in the latency to attack, and a potent reduction (ID50 = 0.095 mg/kg) in the amount of aggressive behaviour directed towards the intruder rat. Starting from the 0.25 mg/kg dose, F15599 induces clear signs of the so-called serotonin syndrome characterized by flat body posture, head-waving, lower lip retraction and hindlimb abduction, leading to increased behavioural inactivity scores and social disengagement[2]. F15599 increases the discharge rate of pyramidal neurones in medial prefrontal cortex (mPFC) from 0.2 μg/kg i.v and reduces that of dorsal raphe 5-hydroxytryptaminergic neurones at doses >10-fold higher (minimal effective dose 8.2 μg/kg i.v.). F15599 increases dopamine output in mPFC (an effect dependent on the activation of postsynaptic 5-HT1A receptors) with an ED50 of 30 μg/kg i.p., whereas it reduces hippocampal 5-HT release (an effect dependent exclusively on 5-HT1A autoreceptor activation) with an ED50 of 240 μg/kg i.p[3].

[1]. Meadows SM, et al. Characterizing the differential roles of striatal 5-HT1A auto- and hetero-receptors in the reduction of l-DOPA-induced dyskinesia. Exp Neurol. 2017 Jun;292:168-178. [2]. de Boer SF, et al. Anti-aggressive effects of the selective high-efficacy 'biased' 5-HTA receptor agonists F15599 and F13714 in male WTG rats. Psychopharmacology (Berl). 2016 Mar;233(6):937-47. [3]. Lladó-Pelfort L, et al. Preferential in vivo action of F15599, a novel 5-HT(1A) receptor agonist, at postsynaptic 5-HT(1A) receptors. Br J Pharmacol. 2010 Aug;160(8):1929-40.

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