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http://dx.doi.org/10.7314/APJCP.2012.13.5.1757

Down-Regulation of CYP1A1 Expression in Breast Cancer  

Hafeez, S. (Cancer Genetics Laboratory, Department of Biosciences, COMSATS Institute of Information Technology)
Ahmed, A. (Cancer Genetics Laboratory, Department of Biosciences, COMSATS Institute of Information Technology)
Rashid, Asif Z. (Department of Surgery, Military Hospital)
Kayani, Mahmood Akhtar (Cancer Genetics Laboratory, Department of Biosciences, COMSATS Institute of Information Technology)
Publication Information
Asian Pacific Journal of Cancer Prevention / v.13, no.5, 2012 , pp. 1757-1760 More about this Journal
Abstract
Breast cancer is a major cause of death in women worldwide. Mammary tissue expressing xenobiotic metabolizing enzymes metabolically activate or detoxify potential genotoxic breast carcinogens. Deregulation of these xenobiotic metabolizing enzymes is considered to be a major contributory factor to breast cancer. The present study is focused on the expression of the xenobiotic metabolizing gene, CYP1A1, in breast cancer and its possible relationships with different risk factors. Twenty five tumors and twenty five control breast tissue samples were collected from patients undergoing planned surgery or biopsy from different hospitals. Semi-quantitative reverse transcriptase polymerase chain reaction (RT-PCR) and western-blotting were used to investigate the expression of CYP1A1 in breast cancer control and disease samples. mRNA expression of CYP1A1 was down-regulated in 40% of breast tumor samples. Down-regulation was also observed at the protein level. Significnat relations were noted with marital status and tumour grade but not histopathological type. In conclusion, CYP1A1 protein expression was markedly reduced in tumor breast tissues samples as compared to paired control tissue samples.
Keywords
CYP1A1; genotoxic; expression; mRNA;
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