(±)-Fabesetron  (Synonyms: (±)-FK1052 free base)

(±)-Fabesetron ((±)-FK1052 free base) is the racemate of Fabesetron, which is a potent 5-HT3 and 5-HT4 receptor dual antagonist^[1].

5-HT3 and 5-HT4 receptor^[1]

In conscious rats, both 5-HT and 5-methoxytryptamine significantly increase fecal pellet output and accelerate colonic transit. In contrast, the effect of 2-methyl-5-HT is slight. Although Ondansetron and Granisetron slightly reduce 5-HT (1 mg/kg s.c.) stimulated colonic transit, FK1052, at 0.1 mg/kg p.o., inhibits completely the increases in the colonic transit. Furthermore, FK1052, Ondansetron and Granisetron significantly depress the increase in fecal pellet output caused by wrap-restraint stress, with ED₅₀ values of 0.21, 3.0 and 1.1 mg/kg p.o., respectively. Intraperitoneal administration of 5-HT and 5-methoxytryptamine, but not 2-methyl-5-HT, produces a dose-related increase in the incidence of diarrhea in fasted mice. 5-HT (0.32 mg/kg i.p.)-induced diarrhea is also inhibited by FK1052, Ondansetron and Granisetron, with ED₅₀ values of 0.09, 2.3 and 0.88 mg/kg p.o., respectively^[1]. FK1052 (1 mg/kg i.v. ×4) apparently reduces delayed emesis caused by Methotrexate (MTX) and increases, but not significantly, the time for onset of emesis. Furthermore, increasing the dose to 3.2 mg/kg of FK1052 also significantly inhibits the number of the emetic episodes induced by MTX, of which the action is more effective than the treatment with FK1052 at 1 mg/kg^[2].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

293.36

C₁₈H₁₉N₃O

129299-72-5

O=C1C(CC2=C(C)N=CN2)CCC(N31)=C(C)C4=C3C=CC=C4

Room temperature in continental US; may vary elsewhere.

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• [1]. Kadowaki M, et al. Effect of FK1052, a potent 5-hydroxytryptamine3 and 5-hydroxytryptamine4 receptor dual antagonist, on colonic function in vivo. J Pharmacol Exp Ther. 1993 Jul;266(1):74-80.  [Content Brief]

  [2]. Yamakuni H, et al. Probable involvement of the 5-hydroxytryptamine(4) receptor in methotrexate-induced delayed emesis in dogs. J Pharmacol Exp Ther. 2000 Mar;292(3):1002-7.  [Content Brief]