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Apoptotic effect of eugenol envolves G2/M phase abrogation accompanied by mitochondrial damage and clastogenic effect on cancer cell in vitro.

Phytomedicine 2016 June 16
BACKGROUND: Eugenol (EUG) is a major phenolic compound present in clove whose anti-cancer properties have been demonstrated previously. These anti-cancer properties may involves the modulation of different mechanisms, including α-estrogen receptor (αER) in luminal breast cancer cells, COX-2 inhibition in melanoma cells or p53 and caspase-3 activation in colon cancer cells.

HYPOTHESIS: EUG promotes a burst in ROS production causing cell-cycle perturbations, mitochondria toxicity and clastogenesis triggering apoptosis in melanoma breast- and cervix-cancer cells in vitro.

METHODS: Morphological changes were evaluated through the light- and electronic- microscopy. Cell-cycle, ROS, PCNA and Apoptosis was detected by flow cytometry and clastogenicity was evaluated by Comet-assay.

RESULTS: The results obtained herein pointed out that EUG promotes, increasing ROS production leading to abrogation of G2/M of phase of cell-cycle, and consecutively, clastogenesis in vitro. In addition, EUG induces Proliferation Cell Nuclear Antigen (PCNA) downregulation and decreasing in mitochondria potential (ΔΨm). Of note, a Bax up-regulation was also observed on cells treated with EUG. All of these findings cooperate in order to induce apoptosis in cancer cells.

CONCLUSION: These promising results presented herein shed new light on the mechanisms of action of EUG suggesting a possible applicability of this phenylpropanoid as adjuvant in anti-cancer therapy.

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