MONNA, a Potent and Selective Blocker for Transmembrane Protein with Unknown Function 16/Anoctamin-1
作者:Soo-Jin Oh、Seok Jin Hwang、Jonghoon Jung、Kuai Yu、Jeongyeon Kim、Jung Yoon Choi、H. Criss Hartzell、Eun Joo Roh、C. Justin Lee
DOI:10.1124/mol.113.087502
日期:2013.11
Transmembrane protein with unknown function 16/anoctamin-1 (ANO1) is a protein widely expressed in mammalian tissues, and it has the properties of the classic calcium-activated chloride channel (CaCC). This protein has been implicated in numerous major physiological functions. However, the lack of effective and selective blockers has hindered a detailed study of the physiological functions of this channel. In this study, we have developed a potent and selective blocker for endogenous ANO1 in Xenopus laevis oocytes (xANO1) using a drug screening method we previously established ([Oh et al., 2008][1]). We have synthesized a number of anthranilic acid derivatives and have determined the correlation between biological activity and the nature and position of substituents in these derived compounds. A structure-activity relationship revealed novel chemical classes of xANO1 blockers. The derivatives contain a −NO2 group on position 5 of a naphthyl group-substituted anthranilic acid, and they fully blocked xANO1 chloride currents with an IC50 < 10 μ M. The most potent blocker, N -((4-methoxy)-2-naphthyl)-5-nitroanthranilic acid (MONNA), had an IC50 of 0.08 μ M for xANO1. Selectivity tests revealed that other chloride channels such as bestrophin-1, chloride channel protein 2, and cystic fibrosis transmembrane conductance regulator were not appreciably blocked by 10∼30 μ M MONNA. The potent and selective blockers for ANO1 identified here should permit pharmacological dissection of ANO1/CaCC function and serve as potential candidates for drug therapy of related diseases such as hypertension, cystic fibrosis, bronchitis, asthma, and hyperalgesia. [1]: #ref-12
跨膜蛋白16/anoctamin-1(ANO1)是一种在哺乳动物组织中广泛表达的蛋白质,具有经典钙激活氯通道(CaCC)的特性。这种蛋白质已被认为涉及许多主要的生理功能。然而,缺乏有效且选择性的阻断剂阻碍了对该通道生理功能的详细研究。在本研究中,我们利用先前建立的药物筛选方法(Oh等,2008),开发了一种对非洲爪蟾卵母细胞中内源性ANO1(xANO1)具有强效和选择性的阻断剂。我们合成了许多邻氨基苯甲酸衍生物,并确定了这些衍生物中的生物活性与取代基性质和位置之间的关联。从结构-活性关系中发现了一系列新的xANO1阻断剂化学类别。这些衍生物在萘基取代的邻氨基苯甲酸的5位含有一个−NO2基团,能完全阻断xANO1氯电流,IC50 < 10 μM。最强效的阻断剂,N -((4-甲氧基)-2-萘基)-5-硝基邻氨基苯甲酸(MONNA),对xANO1的IC50为0.08 μM。选择性测试表明,其他氯通道如bestrophin-1、氯通道蛋白2和囊性纤维化跨膜传导调节因子在10~30 μM MONNA下未被明显阻断。本研究识别出的对ANO1具有强效和选择性的阻断剂应能允许对ANO1/CaCC功能进行药理学解析,并作为治疗高血压、囊性纤维化、支气管炎、哮喘和痛觉过敏等相关疾病的潜在药物候选。