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Expression Patterns of Carcinogen Detoxifying Genes (CYP1A1, GSTP1 & GSTT1) in HNC Patients

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Pathology & Oncology Research

Abstract

Carcinogen detoxifying genes may be involved in pathogenesis of head and neck cancer (HNC). CYP1A1 is phase I enzyme that converts carcinogens into water soluble compounds which are easily excreted from body. GSTs constitute phase II detoxification enzymes that recognize these highly electrophilic compounds and detoxify them. Abnormal expression of these genes can potentially lead to cancer initiation. In present study, we analyzed protein expression of these genes in a total of 192 HNC patients and noncancerous healthy control serum samples screened for GSTs specific activity by ELISA. Furthermore, expression of these molecules was also determined in 49 HNC tissues/ adjacent control tissue by immunohistochemistry with specific antibodies. Mean serum GSTs specific activity was found to be 7.7 (+11.5)U/L in HNC patients and 11.4 (+7.5)U/L in controls. Significant decrease (P < 0.05) in GSTs specific activity was observed in HNC patients compared with controls (P < 0.001). Data for immunohistochemistry showed that CYP1A1 and GSTT1 was down expressed whereas GSTP1 was over expressed in HNC tissues compared with adjacent normal control tissues. Results of immunohistochemistry revealed 63 % HNC tissues had weak, 27 % moderate and 10 % strong staining for CYP1A1. For GSTT1, 27 % HNC tissues had no staining, 49 % weak staining, 16 % moderate and 8 % strong staining. Similarly for GSTP1, percentages for weak, moderate and strong staining were 6 %, 12 % and 82 % respectively. These reduced proteins observed in cancer patients highlight a potential breach on DNA repair mechanism when compared with control. Thus altered expression of these detoxifying molecules may collectively contribute to HNC development in Pakistani population.

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Acknowledgment

Authors would like to thank all the participants of this study. Special thanks to COMSATS Institute of Information Technology, Islamabad, Pakistan and Higher Education Commission Pakistan for financial assistance.

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

    Nosheen Masood & Mahmood Akhtar Kayani

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  1. Nosheen Masood
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  2. Mahmood Akhtar Kayani
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Correspondence to Nosheen Masood.

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Masood, N., Kayani, M.A. Expression Patterns of Carcinogen Detoxifying Genes (CYP1A1, GSTP1 & GSTT1) in HNC Patients. Pathol. Oncol. Res. 19, 89–94 (2013). https://doi.org/10.1007/s12253-012-9563-3

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