Polyphenolic extracts and fractions of selected peach and plum genotypes were evaluated for cell viability and antiproliferation activity in vitro against an estrogen independent MDA-MB-435 and estrogen dependent MCF-7 breast cancer cell lines and one non-cancerous breast line MCF-10A. All extracts showed a phenolic dose-dependent cytotoxic effect against MDA-MB-435, weak activity against MCF-7 and small or no activity against MCF-10A. Genotype phenolic profiles showed varying degrees of polyphenolic mixtures. Fractionation of peach BY00P6653 extracts gave 4 fractions, with fraction F-I (caffeic acid derivatives) showing a strong activity against MDA-MB-435 followed by fraction F-II (anthocyanins). Induced-apoptosis by F-I on MDA-MB-435 was confirmed by Tunnel nuclear staining of cells with apoptotic DNA fragmentation (0-100 μg/mL) with no effects in normal cells (0-200 μg/mL). Selected stone fruit genotypes can be added to the list of fruits with cytotoxic effects against breast cancer cells while not affecting normal cells.
Keywords: Apoptosis; Breast cancer; Polyphenols; Prunus persica; Prunus salicina; Selective cytotoxicity.
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