Allosteric modulators of the cannabinoid CB1 receptor have recently been reported as an alternative approach to modulate the CB1 receptor for therapeutic benefits. In this study, we report the design and synthesis of a series of diarylureas derived from PSNCBAM-1 (2). Similar to 2, these diarylureas dose-dependently inhibited CP55,940-induced intracellular calcium mobilization and [³⁵S]GTP-γ-S binding while enhancing [³H]CP55,940 binding to the CB1 receptor. Structure–activity relationship studies revealed that the pyridinyl ring of 2 could be replaced by other aromatic rings and the pyrrolidinyl ring is not required for CB1 allosteric modulation. 34 (RTICBM-74) had similar potencies as 2 in all in vitro assays but showed significantly improved metabolic stability to rat liver microsomes. More importantly, 34 was more effective than 2 in attenuating the reinstatement of extinguished cocaine-seeking behavior in rats, demonstrating the potential of this diarylurea series as promising candidates for the development of relapse treatment of cocaine addiction.

中文翻译：

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新颖的基于二芳基脲的大麻素CB1受体的变构调节剂：评价6-吡咯烷基吡啶基取代的重要性。

最近有报道称，大麻素CB1受体的变构调节剂是调节CB1受体的另一种治疗方法。在这项研究中，我们报告了一系列源自PSNCBAM-1（2）的二芳基脲的设计和合成。与2相似，这些二芳基脲剂量依赖性地抑制CP55,940诱导的细胞内钙动员和[ ³⁵ S]GTP-γ-S结合，同时增强[ ³ H] CP55,940与CB1受体的结合。结构-活性关系研究表明2的吡啶基环可以被其他芳族环取代，而CB1变构调节不需要吡咯烷基环。34（RTICBM-74）在所有体外测定中的功效均与2相似，但对大鼠肝微粒体的代谢稳定性显着提高。更重要的是，在减轻大鼠熄灭的可卡因寻求行为的恢复方面，34比2更有效，证明了该二芳基脲系列有潜力成为可卡因成瘾复发治疗发展的有希望的候选者。