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Journal of Translational Medicine

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Open Access 01-06-2006 | Research

The expression of p63 is associated with the differential stage in nasopharyngeal carcinoma and EBV infection

Authors: Can Guo, Zhi-Gang Pan, Da-Jiang Li, Jing-Ping Yun, Mei-Zhen Zheng, Zhe-Yu Hu, Li-Zhen Cheng, Yi-Xin Zeng

Published in: Journal of Translational Medicine | Issue 1/2006

Abstract

Background

Nasopharyngeal carcinoma (NPC) is common among Southern Chinese and the main histology is the undifferentiated carcinoma associated with Epstein-Barr virus (EBV) infection. p63 is a recently proved member of the p53 family based on the structural similarity to p53, but its function in NPC is still unknown. This study was aimed to investigate the association between p63 and NPC.

Results

p63 was expressed in 100%(202/202) of nasopharyngeal carcinoma (NPC) tissues but not in 29 nasopharynx inflammation and 17 non-cancerous nasopharyngeal epidermises on a tissue microarray by immunohistostaining. Further investigation suggested that the p63 expression was associated with the differential stage of NPC: p63 strong staining in Keratinizing squamous cell carcinoma, differentiated non-keratinizing NPC and undifferentiated non-keratinizing NPC presented the percentage of 5/8 (62.5%), 43/48 (92.5%) and 50/50 (100%), respectively. A significant difference (p = 0.001) existed between the keratinizing and non-keratinizing groups. No pathogenic mutations were detected in p63 gene in 12 primary NPC tissues and matched peripheral blood lymphocytes (PBL). Half-life measurement study revealed distinct stability of p63 protein in the different cell lines, especially between the carcinoma cell lines with EBV infection and the non-cancerous cell lines. The results of immunoprecipitation suggested a direct interaction between Epstein-Barr virus nuclear antigen 5 (EBNA-5) and p63 protein in NPC, and this binding would increase the stability of p63.

Conclusion

Our data suggested p63 might be used as an adjunct diagnostic marker of NPC and contributed a new way to understand the contribution of the EBV in the pathogenesis of NPC.

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Title: The expression of p63 is associated with the differential stage in nasopharyngeal carcinoma and EBV infection
Authors: Can Guo
Zhi-Gang Pan
Da-Jiang Li
Jing-Ping Yun
Mei-Zhen Zheng
Zhe-Yu Hu
Li-Zhen Cheng
Yi-Xin Zeng
Publication date: 01-06-2006
Publisher: BioMed Central
Published in: Journal of Translational Medicine / Issue 1/2006
Electronic ISSN: 1479-5876
DOI: https://doi.org/10.1186/1479-5876-4-23

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