Characterization of the tumor suppressor gene WWOX in primary human oral squamous cell carcinomas.

Abstract:

:Oral squamous cell carcinoma (OSCC) is the most common malignant neoplasm of the oral cavity, representing 90% of all oral carcinomas and accounting for 3-5% of all malignancies. The WWOX gene (WW-domain containing oxidoreductase) is a candidate tumor suppressor gene located at 16q23.3-24.1, spanning the second most common fragile site, FRA16D. In this report, the role of the WWOX gene was investigated in 20 tumors and 10 normal oral mucosas, and we demonstrated an altered WWOX gene in 50% (10/20) of OSCCs. Using nested RT-PCR, mRNA transcription was altered in 35% of the tumors, with the complete absence of transcripts in 2 samples as well as absence of exons 6-8 (2 tumors), exon 7 (1 tumor), exon 7 and exon 6-8 (1 tumor) and partial loss of exons 8 and 9 (1 tumor). To determine if the aberrant transcripts were translated, Western blots were performed in all samples; however, only the normal protein was detected. By immunohistochemistry, a reduction in Wwox protein expression was observed, affecting 40% of the tumors when compared with normal mucosa. In addition, a novel somatic mutation (S329F) was found. The presence of alterations in mRNA transcription correlated with the reduced expression of Wwox protein in the tumors. These results show that the WWOX gene is frequently altered in OSCC and may contribute to the carcinogenesis processes in oral cancer.

journal_name

Int J Cancer

authors

Pimenta FJ,Gomes DA,Perdigão PF,Barbosa AA,Romano-Silva MA,Gomez MV,Aldaz CM,De Marco L,Gomez RS

doi

10.1002/ijc.21446

keywords:

subject

Has Abstract

pub_date

2006-03-01 00:00:00

pages

1154-8

issue

5

eissn

0020-7136

issn

1097-0215

journal_volume

118

pub_type

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