A substituted aryl amide derivative of 6-naltrexamine—17-cyclopropylmethyl-3,14 β -dihydroxy-4,5 α -epoxy-6 β -[(4′-trimethylfluoro)benzamido]morphinan-hydrochloride—(compound 5 ), previously shown to be a potent κ -opioid receptor antagonist, was used to characterize the physicochemical properties and efficacy to decrease alcohol self-administration in alcohol-preferring rats (P-rats) and binge-like P-rats. Previous studies showed that compounds closely related to compound 5 possessed favorable properties regarding penetration of the blood-brain barrier. Pharmacokinetic studies showed that compound 5 had acceptable bioavailability. In contrast to other κ -receptor antagonists, in particular norbinaltorphimine, compound 5 showed favorable drug-like properties. Based on these findings, further studies were done. Safety studies showed that compound 5 was not hepatotoxic at doses 200-fold greater than an efficacious dose. The effects of compound 5 or naltrexone on the hepatotoxicity of thiobenzamide were investigated. In contrast to naltrexone, which exacerbated thiobenzamide-mediated hepatotoxicity, compound 5 was observed to be hepatoprotective. Based on the physicochemical properties of compound 5 , the compound was examined in rat animal models of alcohol self-administration. The inhibition of ethanol self-administration by compound 5 in alcohol-dependent and alcohol-nondependent P-rats trained to self-administer a 10% (w/v) ethanol solution, using operant techniques, showed very potent efficacy (i.e., estimated ED50 values of 4–5 μ g/kg). In a binge-like P-rat animal model, inhibition of alcohol self-administration by compound 5 had an estimated ED50 value of 8 μ g/kg. The results suggest that compound 5 is a potent drug-like κ -opioid receptor antagonist of utility in alcohol cessation medications development.
6-naltrexamine-17-cyclopropylmethyl-3,14 β -dihydroxy-4,5 α -epoxy-6 β -[(4′-trimethylfluoro)benzamido]morphinan-hydrochloride- (化合物 5)的取代芳基酰胺衍
生物、以前的研究表明,该化合物是一种强效的κ-阿片受体拮抗剂,研究人员利用该化合物来鉴定其理化性质以及降低
酒精偏好大鼠(P-rats)和狂饮型 P-rats的
酒精自我给药的功效。以前的研究表明,与化合物 5 密切相关的化合物在穿透血脑屏障方面具有良好的特性。药代动力学研究表明,化合物 5 具有可接受的
生物利用度。与其他κ受体拮抗剂(尤其是诺比纳托啡)相比,化合物 5 具有良好的类药物特性。基于这些发现,我们进行了进一步的研究。安全性研究表明,在剂量比有效剂量大 200 倍的情况下,化合物 5 不会产生肝毒性。研究还调查了化合物 5 或
纳曲酮对
硫代苯甲酰胺肝毒性的影响。
纳曲酮会加剧
硫代苯甲酰胺介导的肝毒性,而化合物 5 则具有保肝作用。根据化合物 5 的理化性质,研究人员在大鼠
酒精自我给药动物模型中对该化合物进行了研究。化合物 5 对
酒精依赖和非
酒精依赖 P 型大鼠的
乙醇自我给药抑制显示出非常强的效力(即 ED50 值估计为 4-5 μ g/kg)。在狂饮型 P-rat 动物模型中,化合物 5 对
酒精自我给药的抑制 ED50 值估计为 8 μ g/kg。研究结果表明,化合物 5 是一种强效的类药物 κ - 阿片受体拮抗剂,可用于戒酒药物的开发。