Assessing dose-dependent differences in DNA-damage, p53 response and genotoxicity for quercetin and curcumin

作者：Sun Bin; Ross Susan M; Trask O Joseph; Carmichael Paul L; Dent Matthew; White Andrew; Andersen Melvin E; Clewell Rebecca A^*

来源：Toxicology in Vitro, 2013, 27(6): 1877-1887.

DOI：10.1016/j.tiv.2013.05.015

• DNA damage
• Polyphenols
• Micronucleus
• p53
• Quercetin
• Curcumin
• DNA repair

As part of a longer-term goal to create a quantitative mechanistic model of the p53-Mdm2 DNA-damage pathway, we are studying cellular responses to compounds causing DNA-damage by various modes-of action, including two natural polyphenols: quercetin (QUE) and curcumin (CUR). QUE and CUR are weak mutagens in some in vitro assays and possess both anti- or pro-oxidant effects depending on dose. This study examines the dose-response of DNA-damage pathway to these compounds in HT1080 cells (a human cell line with wild-type p53) at doses relevant to human exposure. CUR was more potent in causing reactive oxygen species, DNA damage (measured as phospho-H2AX) and p53 induction, with lowest observed effect levels (LOELs; 3-8 mu M) approximately three-fold lower than QUE (20-30 mu M). CUR showed a strong G2/M arrest and apoptosis at similar to 10 mu M. QUE caused S phase arrest at low doses (8 mu M) and apoptosis was only induced at much higher doses (60 mu M). At concentrations with similar levels of p-H2AX and p53 biomarkers, CUR caused greater micronuclei frequency. CUR induced clear increases micronuclei at 3-6 mu M, while QUE had a weaker micronuclei response even at the highest doses. Thus, even with two compounds sharing common chemistries, DNA-damage response patterns differed significantly in terms of dose and cell fate.

• 出版日期2013-9