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Abstract Title:

Benzyl isothiocyanate promotes apoptosis of oral cancer cells via an acute redox stress-mediated DNA damage response.

Abstract Source:

Food Chem Toxicol. 2016 Nov ;97:336-345. Epub 2016 Sep 28. PMID: 27693243

Abstract Author(s):

Yao-Tsung Yeh, Yen-Nien Hsu, Sheng-Yun Huang, Jian-Sheng Lin, Zi-Feng Chen, Nan-Haw Chow, Shu-Hui Su, Huey-Wen Shyu, Ching-Chiang Lin, Wu-Tein Huang, Hua Yeh, Yu-Chia Chih, Yu-Hsuan Huang, Shu-Jem Su

Article Affiliation:

Yao-Tsung Yeh

Abstract:

Benzyl isothiocyanate (BITC) is a cruciferous vegetable-derived compound with anticancer properties in human cancer cells. However, its anticancer potential and underlying mechanisms remain absent in human oral cancer cells. Results indicate that BITC inhibits growth, promotes G/M phase arrest and triggers apoptosis of OC2 cells with a minimal toxicity to normal cells. BITC-induced cell death was completely prevented by pretreatment with thiol-containing redox compounds including N-acetyl-l-cysteine (NAC), glutathione (GSH), dithiothreitol, and 2-mercaptoethanol, but not free radical scavengers mito-TEMPO, catalase, apocynin, l-NAME and mannitol. BITC rapidly produced reactive oxygen species and nitric oxide, triggered oxidative DNA damage. BITC effectively decreased the intracellular GSH and GSH/GSSG ratio and redox balance recovery by thiol-containing redox compounds, but not by free radical scavengers. Accordingly, redox stresses-DNA damage response (DDR) activated ATM, Chk2, p53, and p21 and subsequently resulted in G/M phase arrest by inhibiting Cdc2 and cyclin B1. Notably, BITC-induced apoptosis was associated with reduced Mcl-1 and Bcl-2 expression, diminished mitochondrial membrane potential (ΔΨm), and increased PARP cleavage. These BITC-induced redox stress-mediated DDR and apoptosis could be blocked by NAC and GSH. Therefore, BITC can be a rational drug candidate for oral cancer and acted via a redox-dependent pathway.

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Sayer Ji
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Depression: 21st Century Solutions + The Dark Side of Wheat

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