Overexpression of p16 INK4a as an indicator for human papillomavirus oncogenic activity in cervical squamous neoplasia
| Autor: | Shirou Nozawa, Ingo Nindl, K. Tsukazaki, Miyuki Saito, Takuma Fujii, Makio Mukai, Mitsuya Ishikawa, Kaneyuki Kubushiro, Akiko Ono |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Oncology
Adult medicine.medical_specialty Clone (cell biology) Uterine Cervical Neoplasms Cervical intraepithelial neoplasia Polymerase Chain Reaction Sensitivity and Specificity Cohort Studies Tissue Culture Techniques Internal medicine Carcinoma Biomarkers Tumor Medicine Humans neoplasms Papillomaviridae Cyclin-Dependent Kinase Inhibitor p16 Aged Aged 80 and over biology business.industry Biopsy Needle Papillomavirus Infections Retinoblastoma protein HPV infection virus diseases Obstetrics and Gynecology Cell cycle Middle Aged medicine.disease Prognosis Immunohistochemistry female genital diseases and pregnancy complications Koilocyte body regions Gene Expression Regulation Neoplastic biology.protein Cancer research Carcinoma Squamous Cell Female business |
| Zdroj: | International journal of gynecological cancer : official journal of the International Gynecological Cancer Society. 16(1) |
| ISSN: | 1048-891X |
| Popis: | Overexpression of p16(INK4a) has been observed when retinoblastoma protein is inactivated by high-risk human papillomavirus (HPV) oncoprotein E7. We investigated overexpression of p16(INK4a) and HPV infection in cervical squamous neoplasia to evaluate the oncogenic potential among various HPV subtypes. The high-risk HPV was detected by PCR in 69.8% (37/53), 97.5% (39/40), 91.7% (44/48), and 100% (16/16) of cervical intraepithelial neoplasia (CIN)1, CIN2, CIN3, and squamous cell carcinoma (SCC), respectively. The p16(INK4a) overexpression was investigated immunohistochemically using a p16(INK4a)-specific monoclonal antibody (clone E6H4). In high-risk HPV positive cases, 32.4% (12/37) of CIN1, 82.1% (32/39) of CIN2, 93.2% (41/44) of CIN3, and all (16/16) SCC showed p16(INK4a) overexpression. The incidence of p16(INK4a) overexpression was significantly different between CIN1 and CIN2, suggesting that the disorder of cell cycle regulation by HPV frequently occurred from CIN2. As for CIN1 cases, p16(INK4a) overexpression was observed more frequently in HPV16 and HPV52 than in HPV51 and HPV35. Using p16(INK4a) as a bio marker of HPV oncogenic activity, we demonstrate that the level of pRb dysfunction by high-risk HPV varied from subtypes and was getting more frequent from CIN2. |
| Databáze: | OpenAIRE |
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