Reduced expression of p16 and p27 proteins in nasopharyngeal carcinoma.

Abstract

Nasopharyngeal carcinoma (NPC) is a malignant tumor with a high incidence in east Asian countries. Inactivation of cyclin-dependent kinase (CDK) inhibitors (CKIs) and overexpression of G1 cyclin has been thought to be important for tumor development. To determine whether reduction of CKI (p16 and p27) expression was associated with NPC development, we performed immunohistochemical staining of NPC specimens from 20 patients. We found that p16 and p27 proteins were negative in 8 of 20 and 16 of 20 cases, respectively; that either p16 or p27 proteins were negative in 17 of 20; and that both p16 and p27 were negative in 7 of 20. Excepting the cases in which both CKIs were negative, negativity of p27 alone was statistically higher than that of p16 (9/20 versus 1/20, P = .022), suggesting that the reduction of p27 protein is an important event for the multi-step process of NPC development.

• Authors: Y Baba, M Tsukuda, I Mochimatsu, S Furukawa, H Kagata, K Satake, S Koshika, Y Nakatani, M Hara, Y Kato, Y Nagashima
• Journal: Cancer detection and prevention (Cancer Detect Prev) Vol. 25 Issue 5 Pg. 414-9 ( 2001) ISSN: 0361-090X [Print] England
• PMID: 11718447 (Publication Type: Comparative Study, Journal Article)

Chemical References

• Cell Cycle Proteins
• Cyclin-Dependent Kinase Inhibitor p16
• Enzyme Inhibitors
• Tumor Suppressor Proteins
• Cyclin D1
• Cyclin-Dependent Kinase Inhibitor p27
• Cyclin-Dependent Kinases

Topics

• Carcinoma, Squamous Cell (metabolism, pathology)
• Cell Cycle Proteins (metabolism)
• Cyclin D1 (metabolism)
• Cyclin-Dependent Kinase Inhibitor p16 (metabolism)
• Cyclin-Dependent Kinase Inhibitor p27
• Cyclin-Dependent Kinases (antagonists & inhibitors)
• Enzyme Inhibitors (metabolism)
• Genes, Tumor Suppressor (physiology)
• Humans
• Immunoenzyme Techniques
• Nasopharyngeal Neoplasms (metabolism, pathology)
• Nasopharynx (metabolism)
• Tumor Suppressor Proteins (metabolism)