New phthalazine-derived inhibitors for VEGFR-2 were synthesized for anticancer evaluations. Also, docking studies were performed to explore the suggested binding orientations of the novel derivatives inside the binding site of VEGFR-2. The achieved biological data were extremely interrelated to that of docking study. In specific, derivative 3f was the greatest effective compound against HepG2 and MCF-7 cancer cell lines with IC50 = 0.17 ± 0.01 and 0.08 ± 0.01 µM individually. The six highly active derivatives 3b, 3e, 3f, 3g, 6a, and 6b were estimated for their VEGFR-2 inhibitory effects. Derivative 3f was the greatest effective compound which inhibited VEGFR-2 at IC50 = 0.0557 ± 0.002 µM. The activities of 3f were assessed against MCF-7 cancer cells for apoptosis induction, cell cycle distribution, and growth inhibition. Compound 3f induced early apoptosis (21.44%) by more than 36 folds over the control (0.59%). The obtained results showed that compound 3f induced necrotic effect (6.03%) by more than threefolds over the control (1.75%). On the other hand, compound 3f improved the level of the pro-apoptotic protein; Bax by approximately fivefolds. Moreover, compound 3f noticeably decreased the levels of the anti-apoptotic proteins Bcl-2 by nearly fourfolds in comparison to the control. In addition, derivative 3f remarkably enhanced the Bax/Bcl2 ratio by nearly 18 folds, as compared to the control. Finally, our derivatives 3f, 3g, and 6b revealed good in silico considered ADMET profile in comparing to sorafenib.
Keywords: VEGFR‐2 inhibitors; anticancer agents; molecular docking; phthalazines.
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