Abstract
Lauryl gallate is an antioxidant food additive showing low toxicity to normal cells. Here, its antiproliferative effect has been studied on three human breast cancer cell lines: estrogen-dependent, wild-type p53, MCF7; estrogen-independent, non-functional p53, MDA-MB-231 and MCF7 ADR, which overexpresses P-glycoprotein (P-gp) and displays a multidrug-resistant phenotype. Lauryl gallate inhibited proliferation and induced cell cycle alterations in all three cell lines without altering P-gp functionality in the drug-resistant cells. A stable arrest in G(1) phase was observed in MCF7, while a slow-down of cell cycle progression was induced in the other two cell lines. Lauryl gallate increased p53 expression only in MCF7, and upregulated p21(Cip1) and reduced cyclin D1 levels in all three cell lines. The induction of apoptosis, demonstrated by annexin V-FITC labeling, PARP cleavage and mitochondrial membrane depolarization and morphological alterations, were clearly detected in MCF7 ADR and MDA-MB-231 and to a minor extent in MCF7. Overexpression of Bcl-2 in MCF7 ADR cells demonstrated its protective role against morphological alterations and apoptosis. Lauryl gallate induction of p21(Cip1) and apoptosis observed in all three cell ...Continue Reading
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