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Abstract Title:

Resveratrol induces DNA damage in colon cancer cells by poisoning topoisomerase II and activates the ATM kinase to trigger p53-dependent apoptosis.

Abstract Source:

Toxicol In Vitro. 2015 Aug ;29(5):1156-65. Epub 2015 May 5. PMID: 25952326

Abstract Author(s):

Benjamin Demoulin, Maryse Hermant, Cédric Castrogiovanni, Catherine Staudt, Patrick Dumont

Article Affiliation:

Benjamin Demoulin

Abstract:

Resveratrol (trans-3,4',5-trihydroxystilbene) is a natural polyphenol synthesized by various plants such as grape vine. Resveratrol (RSV) is a widely studied molecule, largely for its chemopreventive effect in different mouse cancer models. We propose a mechanism underlying the cytotoxic activity of RSV on colon cancer cells. Our data show that resveratrol induces apoptosis, as observed by the cleavage of PARP-1 and chromatin condensation. We show that the tumor suppressor p53 is activated in response to RSV and participates to the apoptotic process. Additionally, we show that HCT-116 p53 wt colon carcinoma cells are significantly more sensitive than HCT-116 p53-/- cells to RSV. RSV induces DNA damage including double strand breaks, as evidenced by the presence of multipleγ-H2AX foci in 50% of cells after a 24 h treatment with 25 μM RSV. The formation of DNA damage does not appear to rely on a pro-oxidant effect of the molecule, inhibition of topoisomerase I, or DNA intercalation. Rather, we show that DNA damage is the consequence of type II topoisomerase poisoning. Exposure of HCT-116 cells to RSV leads to activation of the Ataxia Telangiectasia Mutated (ATM) kinase, and ATM is required to activate p53.

Study Type : In Vitro Study

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Sayer Ji
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