Molecular and immunological aspects of p53 and p53-autoantibodies in head and neck squamous cell carcinoma.

Abstract:

:The tumour suppressor protein p53 (wild-type = wt-p53) is of major importance in the genetic integrity of the cell. Mutations of the p53-gene (mt-p53) are the most frequent genetic aberrations identified in different tumour entities. As analyzed in a wide variety of human malignomas, mt-p53 evokes a specific immune response. Yet, the possible occurrence of p53-autoantibodies in patients with head and neck squamous cell carcinomas (HNSCC) correlated to p53-mutations, p53 in sera and p53-overexpression in tissue has not been previously investigated. For the first time, the p53 status in 24 HNSCC patients was analyzed in the present study. The following parameters were investigated: analysis of mutation frequency of the p53-gene by direct sequencing of the exons 5-9, immunohistochemical detection of p53, measurement of the wt- and mt-p53-protein in sera by ELISA and p53-autoantibodies in sera by ELISA. Mutations of the p53-gene were detected in four (17%) patients. Overexpression of wt-p53 was detected by immunohistochemistry in 18 out of 24 (75%) tumours. In 8 (33%) patients the p53-protein was also detectable in sera, whereas in just one of these eight patients p53-autoantibodies were detectable simultaneously. Overall 6 out of 24 (25%) patients were found to be positive for serum p53-autoantibodies. Of these 6 cases, 5 could be assigned to tumours with immunohistochemically measurable wt-p53-overexpression. There was no correlation between p53-overexpression in tissue and p53-protein levels in sera or between p53-autoantibody levels in sera, nor in mutation frequency of the p53-gene and p53-overexpression in tissue. The results presented herein support the hypothesis that strong accumulation of p53 in the tissue is an important prerequisite for development of p53-autoantibodies. However, there must be further, yet unknown factors that influence the p53-autoantibody production because p53-autoantibodies were not identified in sera in each case of p53-accumulation in the tissue.

journal_name

Oncol Rep

journal_title

Oncology reports

authors

Cordes C,Von Lingen J,Görögh T,Ambrosch P,Gottschlich S,Hoffmann M

doi

10.3892/or_00000568

subject

Has Abstract

pub_date

2009-12-01 00:00:00

pages

1299-303

issue

6

eissn

1021-335X

issn

1791-2431

journal_volume

22

pub_type

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