Design and Synthesis of Phthalazine-based Compounds As Potent Anticancer Agents with Potential Antiangiogenic Activity Via VEGFR-2 Inhibition
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In the designed compounds, either a biarylamide or biarylurea moiety or an N-substituted piperazine motif was linked to position 1 of the phthalazine core. The anti-proliferative activity of the synthesised compounds revealed that eight compounds () exhibited excellent broad spectrum cytotoxic activity in NCI 5-log dose assays against the full 60 cell panel with GI values ranging from 0.15 to 8.41 µM. Moreover, the enzymatic assessment of the synthesised compounds against VEGFR-2 tyrosine kinase showed the significant inhibitory activities of the biarylureas () with ICs of 4.4, 2.7 and 2.5 μM, respectively, and with 79.83, 72.58 and 71.6% inhibition of HUVEC at 10 μM, respectively. Additionally, compounds ( were found to induce cell cycle arrest at S phase boundary. Compound triggered a concurrent increase in cleaved caspase-3 expression level, indicating the apoptotic-induced cell death.
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