Abstract
Twenty-five acetophenone/piperazin-2-one (APPA) hybrids were designed and synthesized based on key pharmacophores found in anti-breast cancer drugs Neratinib, Palbociclib, and Olaparib. Compound 1j exhibited good in vitro antiproliferative activity (IC50 = 6.50 μM) and high selectivity (SI = 9.2 vs HER2-positive breast cancer cells SKBr3; SI = 7.3 vs normal breast cells MCF-10A) against triple negative breast cancer (TNBC) cells MDA-MB-468. In addition, 1j could selectively cause DNA damage, inducing the accumulation of γH2AX and P53 in MDA-MB-468 cells. It also reduced the phosphorylation level of P38 and the expression of HSP70, which further prevented the repair of DNA damage and caused cells S/G2-arrest leading to MDA-MB-468 cells death.
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