Twenty-four novel β-carboline/acylhydrazone hybrids were synthesized and evaluated for their in vitro antiproliferative activity. Among them, 12r exhibited the most potent activity, with IC₅₀ values of 1–2 μM against panel of cancer cell lines and retained significant activity in multidrug resistant cancer cells. Treated cells were not arrested in any phase of cell cycle but resulted in late cellular apoptosis on both MCF-7 and MCF-7/ADR cancer cells. Importantly, 12r showed certain antitumor effect on inhibiting the tumor growth with low toxic and side effects and without significant body weight loss.

中文翻译：

---

发现新型β-咔啉/酰基hydr杂化物作为有效的抗肿瘤药并克服耐药性

合成了二十四个新型β-咔啉/酰基ac杂化物，并对其体外抗增殖活性进行了评估。其中，12r表现出最强的活性，对癌细胞系的IC ₅₀值为1-2μM，并且在具有多重耐药性的癌细胞中保留了显着的活性。处理过的细胞在细胞周期的任何阶段都没有停滞，而是导致了MCF-7和MCF-7 / ADR癌细胞的晚期细胞凋亡。重要的是，12r在抑制肿瘤生长方面显示出一定的抗肿瘤作用，且毒性低，副作用小且体重没有明显减轻。