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Down-regulation of CYP1A1 expression in breast cancer

S Hafeez1, A Ahmed, Asif Z Rashid

  • 1Cancer Genetics Laboratory, Department of Biosciences, COMSATS Institute of Information Technology, Islamabad, Pakistan.

Asian Pacific Journal of Cancer Prevention : APJCP
|August 21, 2012
PubMed

Insights

This study found reduced expression of the xenobiotic metabolizing gene CYP1A1 in breast tumor tissues compared to normal tissues. This down-regulation of CYP1A1 may contribute to breast cancer development.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Breast cancer is a leading cause of mortality in women globally.
  • Xenobiotic metabolizing enzymes in mammary tissue play a role in detoxifying or activating breast carcinogens.
  • Dysregulation of these enzymes is implicated in breast cancer pathogenesis.

Purpose of the Study:

  • To investigate the expression of the xenobiotic metabolizing gene CYP1A1 in breast cancer.
  • To explore potential correlations between CYP1A1 expression and breast cancer risk factors.

Main Methods:

  • Collected 25 breast tumor and 25 control tissue samples.
  • Utilized semi-quantitative reverse transcriptase polymerase chain reaction (RT-PCR) to assess mRNA expression.
  • Employed western-blotting to evaluate protein expression levels of CYP1A1.

Main Results:

  • CYP1A1 mRNA expression was down-regulated in 40% of breast tumor samples.
  • Protein expression of CYP1A1 was also found to be reduced in tumor tissues compared to controls.
  • Significant associations were observed between CYP1A1 expression and marital status and tumor grade.

Conclusions:

  • CYP1A1 protein expression is significantly reduced in breast tumor tissues.
  • The down-regulation of CYP1A1 may be a contributing factor in breast cancer development.
  • Further research is warranted to understand the implications of CYP1A1 alterations in breast cancer.

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