Synthesis and Pharmacological in Vitro and in Vivo Profile of 3-Oxo-1,1-diphenyl-tetrahydro-oxazolo[3,4-<i>a</i>]pyrazine-7-carboxylic Acid 4-Fluoro-benzylamide (SHA 68), a Selective Antagonist of the Neuropeptide S Receptor
作者:Naoe Okamura、Stephen A. Habay、Joanne Zeng、A. Richard Chamberlin、Rainer K. Reinscheid
DOI:10.1124/jpet.107.135103
日期:2008.6
Neuropeptide S (NPS) has been shown to modulate arousal, sleep wakefulness, anxiety-like behavior, and feeding after central administration of the peptide agonist to mice or rats. We report here the chemical synthesis and pharmacological characterization of SHA 66 (3-oxo-1,1-diphenyl-tetrahydro-oxazolo[3,4- a ]pyrazine-7-carboxylic acid benzylamide) and SHA 68 (3-oxo-1,1-diphenyl-tetrahydro-oxazolo[3,4- a ]pyrazine-7-carboxylic acid 4-fluoro-benzylamide), two closely related bicyclic piperazines with antagonistic properties at the NPS receptor (NPSR). The compounds block NPS-induced Ca2+ mobilization, and SHA 68 shows displaceable binding to NPSR in the nanomolar range. The antagonistic activity of SHA 68 seems to be specific because it does not affect signaling at 14 unrelated G protein-coupled receptors. Analysis of pharmacokinetic parameters of SHA 68 demonstrates that the compound reaches pharmacologically relevant levels in plasma and brain after i.p. administration. Furthermore, peripheral administration of SHA 68 in mice (50 mg/kg i.p.) is able to antagonize NPS-induced horizontal and vertical activity as well as stereotypic behavior. Therefore, SHA 68 could be a useful tool to characterize physiological functions and pharmacological parameters of the NPS system in vitro and in vivo.
神经肽 S(Neuropeptide S,NPS)已被证明可以调节小鼠或大鼠的觉醒、睡眠觉醒、焦虑样行为和摄食。我们在此报告 SHA 66(3-oxo-1,1-diphenyl-tetrahydro-oxazolo[3,4-a ]pyrazine-7-carboxylic acid benzylamide)和 SHA 68(3-oxo-1、1-二苯基-四氢噁唑并[3,4- a ]吡嗪-7-羧酸 4-氟苯甲酰胺)和 SHA 68(3-氧代-1, 1-二苯基-四氢噁唑并[3,4- a ]吡嗪-7-羧酸 4-氟苯甲酰胺),这是两种密切相关的双环哌嗪类化合物,具有拮抗 NPS 受体(NPSR)的特性。这两种化合物能阻断 NPS 诱导的 Ca2+ 迁移,SHA 68 与 NPSR 的结合在纳摩尔范围内具有可置换性。SHA 68 的拮抗活性似乎是特异性的,因为它不会影响 14 种不相关的 G 蛋白偶联受体的信号传导。对 SHA 68 药代动力学参数的分析表明,静脉注射后,该化合物在血浆和大脑中达到了药理相关水平。此外,给小鼠外周注射 SHA 68(50 毫克/千克 i.p.)能够拮抗 NPS 引起的水平和垂直活动以及刻板行为。因此,SHA 68 可以作为一种有用的工具,用于描述 NPS 系统在体外和体内的生理功能和药理参数。