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A synthetic chalcone derivative, 2-hydroxy-3',5,5'-trimethoxychalcone (DK-139), triggers reactive oxygen species-induced apoptosis independently of p53 in A549 lung cancer cells.

Abstract：

:2-Hydroxy-3',5,5'-trimethoxychalcone (named DK-139) is a synthetic chalcone derivative that has anti-inflammatory, anti-tumor, and endoplasmic reticulum-mediated apoptosis activities. However, the mode of action of DK-139 on reactive oxygen species (ROS)-induced apoptosis remains unknown. In this study, we found that DK-139 activated DNA damage responses, as was revealed by the accumulation of the tumor suppressor p53 and the phosphorylation of histone H2AX at Ser139 (called γ-H2AX), which are hallmarks of DNA damage responses. The occurrence of DK-139-induced DNA damage was confirmed through single-cell gel electrophoresis (comet tail assay). Interestingly, using p53-null HCT116 cells revealed that p53 was not involved in DK-139-induced apoptosis. Instead, we found that DK-139 increased the production of ROS, which led to the processing of caspase-2, BH3 interacting-domain death agonist (BID), caspase-9, and caspase-7. Pretreatment with the ROS scavenger N-acetyl cysteine reduced the frequency of DK-139-induced γ-H2AX formation, demonstrating that DK-139 triggered DNA damage through ROS production. In addition, NAC pretreatment prevented DK-139-induced processing of caspase-2, BID, caspase-9, caspase-7, and poly(ADP-ribose) polymerase. These results suggest that DK-139 triggers apoptosis through ROS-mediated DNA damage and activation of the caspase-2 cascade in A549 human lung cancer cells.

journal_name

Chem Biol Interact

journal_title

Chemico-biological interactions

authors

Gil HN,Jung E,Koh D,Lim Y,Lee YH,Shin SY

doi

10.1016/j.cbi.2018.11.003

subject

Has Abstract

pub_date

2019-01-25 00:00:00

pages

72-79

eissn

0009-2797

issn

1872-7786

pii

S0009-2797(18)31104-9

journal_volume

298

pub_type

杂志文章

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