Abstract
In connection with our research program on the development of novel indolin-2-one-based anticancer candidates, herein we report the design and synthesis of different series of hydrazonoindolin-2-ones 3a-e, 5a-e, 7a-c, and 10a-l. The synthesised derivatives were in vitro evaluated for their anti-proliferative activity towards lung A-549, colon HT-29, and breast ZR-75 human cancer cell lines. Compounds 5b, 5c, 7b, and 10e emerged as the most potent derivatives with average IC50 values of 4.37, 2.53, 2.14, and 4.66 µM, respectively, which are superior to Sunitinib (average IC50 = 8.11 µM). Furthermore, compounds 7b and 10e were evaluated for their effects on cell cycle progression and levels of phosphorylated retinoblastoma (Rb) protein in the A-549 cancer cell line. Moreover, 7b and 10e inhibited the cell growth of the multidrug-resistant lung cancer NCI-H69AR cell line with IC50 = 16 µM. In addition, the cytotoxic activities of 7b and 10e were assessed towards three non-tumorigenic cell lines (Intestine IEC-6, Breast MCF-10A, and Fibroblast Swiss-3t3) where both compounds displayed mean tumor selectivity index (1.6 and 1.8) higher than that of Sunitinib (1.4).
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