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Overexpression of STAT3 in HPV-mediated cervical cancer in a North Indian population

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Abstract

The constitutively activated STAT family members, particularly STAT3, have been shown to possess transforming properties, and are strongly correlated with tumor development and progression. STAT3 transmits signals from many cytokines and growth factors to target genes in the nucleus through the Jak/Stat signaling pathway. HPV is the main etiological factor in the development of cervical cancer. In the current study, the expression of STAT3 was analyzed in various stages of HPV-mediated cervical carcinogenesis. Tissue biopsies from 100 patients with cervical cancer of different stages and normal tissues from patients undergoing hysterectomy were selected for studying the HPV status and STAT3 expression. HPV status of each corresponding biopsy was analyzed by PCR and typing. The mRNA expression was analyzed by reverse-transcriptase polymerase chain reaction (RT-PCR). HPV infection was detected in majority of cases: 75% (9/12) in precancer, 85% (34/40) stage I & II, and 95% (36/38) in stage III & IV of cervical cancer cases by L1 PCR. Further sub typing revealed HPV16 in 100% (9/9) of L1 positives in precancerous & 90% (63/70) in different stages of cancer. Significant level of STAT3 mRNA expression was predominantly found in cervical cancer cases as compared to normal controls (P = 0.001). We also found a significant correlation of STAT3 expression in cases infected with HPV (P = 0.001). Our results indicate a potentially interactive effect between HPV 16/18 and transcriptional activation of STAT3 gene in cervical carcinogenesis. To our knowledge, this is the first such study to be reported from India. Further investigations are needed to determine the influence of STAT3 expression on cervical carcinogenesis and its possible interaction with HPV infection status.

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Acknowledgments

We greatly acknowledge the help done by the staff and patients of Post Graduate Institute of Medical Education and Research, Sector 12, Chandigarh. This study was funded by DBT (Department of Biotechnology), Government of India, New Delhi, India, to Prof. R.C. Sobti.

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Authors and Affiliations

  1. Department of Biotechnology, Panjab University, Chandigarh, 160014, India

    R. C. Sobti & Neha Singh

  2. Division of Molecular Oncology, Institute of Cytology and Preventive Oncology (ICMR), Noida, India

    Showket Hussain, A. C. Bharti & B. C. Das

  3. Ambedkar Centre for Biomedical Research, Delhi University, Delhi, India

    B. C. Das

  4. Department of Obstetrics and Gynaecology, Post Graduate Institute of Medical Education and Research, Chandigarh, 160014, India

    Vanita Suri

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  1. R. C. Sobti
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  2. Neha Singh
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Correspondence to R. C. Sobti.

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Sobti, R.C., Singh, N., Hussain, S. et al. Overexpression of STAT3 in HPV-mediated cervical cancer in a North Indian population. Mol Cell Biochem 330, 193–199 (2009). https://doi.org/10.1007/s11010-009-0133-2

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  • DOI: https://doi.org/10.1007/s11010-009-0133-2

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