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The correlations between BRCA1 defect and environmental factors in the risk of breast cancer

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Author(s)
Hyo Jin KangYoung Bin HongYong Weon YiChi-Heum ChoAntai WangInsoo Bae
Keimyung Author(s)
Cho, Chi Heum
Department
Dept. of Obstetrics & Gynecology (산부인과학)
Journal Title
Journal of Toxicological Sciences
Issued Date
2013
Volume
38
Issue
3
Keyword
BRCA1Genetic factorEnvironmental factorsTumorigenesisBreast cancer
Abstract
The risk factors for breast cancer, the most common female malignant cancer, include environmental factors such as radiation, tobacco, a high-fat diet, and xenoestrogens as well as hormones. In addition, BRCA1 and BRCA2 are the most well-known genetic factors that increase risk for breast cancer. Coincidence of those environmental and genetic factors might augment the risk of tumorigenesis of breast. To verify this hypothesis, we briefly evaluated the carcinogenic potency of various environmental factors in the absence or presence of BRCA1 as a genetic factor in a normal mammary epithelial cell line, MCF10A. Many environmental factors tested increased cellular ROS level in the absence of other insult. In addition, TCDD, DMBA, 3MC, and BPA enhanced the BaP-induced ROS production. BRCA1 knockdown (BRCA1-KD) cells by siRNA significantly induced cellular accumulation of ROS compared to control cells. In this setting, the addition of paraquat, TCDD, DMBA, 2OHE2 or 4OHE2 significantly augmented ROS generation in BRCA1-KD MCF10A cells. Measurements of BaP-DNA adduct formation as a marker of DNA damage also revealed that BRCA1 deficiency leads increased DNA damage. In addition, TCDD and DMBA significantly increased BaP-DNA adduct formation in the absence of BRCA1. These results imply that elevated level of ROS is correlated with increase of DNA damage in BRCA1 defective cells. Taken together, our study suggests that several environmental factors might increase the risk of tumorigenesis in BRCA1 defective breast epithelial cells.
Keimyung Author(s)(Kor)
조치흠
Publisher
School of Medicine
Citation
Hyo Jin Kang et al. (2013). The correlations between BRCA1 defect and environmental factors in the risk of breast cancer. Journal of Toxicological Sciences, 38(3), 355–361. doi: 10.2131/jts.38.355
Type
Article
ISSN
0388-1350
DOI
10.2131/jts.38.355
URI
https://kumel.medlib.dsmc.or.kr/handle/2015.oak/34519
Appears in Collections:
1. School of Medicine (의과대학) > Dept. of Obstetrics & Gynecology (산부인과학)
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