PI3K/Akt/mTOR signaling pathway is a validated drug target for cancer treatment that plays a critical role in controlling tumor growth, proliferation, and apoptosis. However, no FDA-approved PI3K/mTOR dual inhibitor exists. Thus, a candidate with a better curative effect and lower toxicity is still urgently needed. Herein, we design, synthesize, and evaluate compounds belonging to a novel series of 2-methyl-1H-imidazo[4,5-c]quinoline scaffold derivatives as PI3K/mTOR dual inhibitors. Among them, compound 8o was identified as a novel candidate with excellent kinase selectivity. It manifested remarkable antiproliferative activities against SW620 and HeLa cells. Western blot and immunohistochemical analysis results proved that 8o could regulate the PI3K/AKT/mTOR signaling pathway by inhibiting the phosphorylation of AKT and S6 proteins. Additionally, 8o presented a favorable pharmacokinetic property (oral bioavailability of 76.8%) and significant antitumor efficacy in vivo without obvious toxicity. Collectively, these results indicated that 8o is a promising agent for cancer treatment and merits further development.

中文翻译：

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2-Methyl-2-(4-(2-methyl-8-(1H-pyrrolo[2,3-b]pyridin-6-yl)-1H-naphtho[1,2-d]imidazol-1-)的发现基）苯基）丙腈作为一种新型 PI3K/mTOR 抑制剂，具有增强的体外和体内抗肿瘤功效

PI3K/Akt/mTOR 信号通路是一种经过验证的癌症治疗药物靶点，在控制肿瘤生长、增殖和凋亡方面发挥着关键作用。然而，不存在 FDA 批准的 PI3K/mTOR 双抑制剂。因此，仍迫切需要一种疗效更好、毒性更低的候选药物。在此，我们设计、合成和评估属于新型 2-甲基-1 H-咪唑并[4,5 - c ]喹啉支架衍生物系列的化合物，作为 PI3K/mTOR 双重抑制剂。其中，化合物8o被鉴定为具有优异激酶选择性的新型候选物。它对SW620和HeLa细胞表现出显着的抗增殖活性。Western blot和免疫组化分析结果证明8o可以通过抑制 AKT 和 S6 蛋白的磷酸化来调节 PI3K/AKT/mTOR 信号通路。此外，8o具有良好的药代动力学特性（口服生物利用度为 76.8%）和显着的体内抗肿瘤功效，且无明显毒性。总的来说，这些结果表明8o是一种很有前景的癌症治疗药物，值得进一步开发。