RS 127445

Short Summary : 5-HT2B receptor antagonist,high affinity

Category : Neuroscience|5-HT Receptor

Purity : 0.98

CAS Number : 199864-87-4

Formula : C17H16FN3

Molecular Weight : 281.33

SMILE : FC1=CC=C(C2=CC(C(C)C)=NC(N)=N2)C3=CC=CC=C31

Solubility : Soluble in DMSO > 10 mM

Storage : Store at -20°C

Description : RS-127445(MT 500) is a selective 5-HT2B receptor antagonist with pKi of 9.5 and pIC50 of 10.4 [1].
5-HT2B receptor belongs to the 5-HT2 receptor family which binds the neurotransmitter serotonin. It plays important role relevant to serotonin, including neuronal sensitization to tactile stimuli.
RS 127445 is a selective serotonin 5-HT2B receptor inhibitor. RS-127445 is found to have nM affinity and 1000 fold selectivity for the 5-HT2B receptor [2]. RS-127445 potently blocks the 5-HT evoked increase in inositol phosphate formation and blocks the 5-HT evoked increases in intracellular calcium concentrations with a potency 1000 times greater than that of yohimbine.
In rat model, oral administration of RS-127445 at 1 to 10 mg/kg resulted in significant inhibition of visceral hypersensitivity up to 35 to 74% triggered by restraint stress [3]. Moreover, 3 to 30 mg/ kg of RS-127445 resulted in a significant inhibition of TNBS-induced visceral hypersensitivity varied from 15 to 62% [3].
References:[1]. O’Mahony, S M et al. 5-HT2B receptors modulate visceral hypersensitivity in a stress-sensitive animal model of brain-gut axis dysfunction. Neurogastroenterology & Motility, 2012, 22(5): 573-578.[2]. Ohashi-Doi K et al. A selective, high affinity 5-HT2B receptor antagonist inhibits visceral hypersensitivity in rats. Neurogastroenterology & Motility, 2010, 22(2): 69-76.[3]. Bassil A K et al. Inhibition of colonic motility and defecation by RS-127445 suggests an involvement of the 5-HT2B receptor in rodent large bowel physiology. British Journal of Pharmacology, 2009, 158(1): 252-258.

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