ROLE OF DCC(DELETED IN COLORECTAL CANCER) GENE IN ORAL SQUAMOUS CELL CARCINOMA

구강편평상피암종에서 DCC 유전자의 역할

  • Ko, Seong-Kyu (Department of Oral and Maxillofacial Surgery, College of Dentistry, Dankook University) ;
  • Han, Se-Jin (Department of Oral and Maxillofacial Surgery, College of Dentistry, Dankook University) ;
  • Kim, Kyung-Wook (Department of Oral and Maxillofacial Surgery, College of Dentistry, Dankook University)
  • 고성규 (단국대학교 치과대학 구강악안면외과학교실) ;
  • 한세진 (단국대학교 치과대학 구강악안면외과학교실) ;
  • 김경욱 (단국대학교 치과대학 구강악안면외과학교실)
  • Published : 2008.10.31

Abstract

Chromosome 18q alteration plays a key role in colorectal tumorigenesis, and loss of heterozygosity at 18q is associated with a poor prognosis in colon cancer. DCC(Deleted in Colorectal Cancer) is a putative tumor- suppressor gene at 18q21 that encodes a transmembrane protein with structural similarity to neural cell adhesion molecule that is involved in both epithelial and neuronal cell differentiation. DCC is implicated in regulation of cell growth, survival and proliferation. Thus, tumor progression in squamous cell carcinoma, stomach cancer, colorectal cancer correlates with downregulation of DCC expression. The mechanism for DCC suppression is associated with hypermethylation of the DCC gene promoter region. Hence, the goal of this study is to identify the promoter methylation responsible for the down-regulation of DCC expression in oral squamous cell carcinoma. 12 of tissue specimens for the study are excised and gathered from 12 patients who are diagnosed as SCC in department of OMS, dental hospital, dankook university. To find expression of DCC in each tissue samples, immunohistochemical staining, RT-PCR gene analysis and methylation specific PCR are processed. The results are as follows. 1. In the DCC gene RT-PCR analysis, 5(41.6%) of 12 specimens of oral squamous cell carcinoma did not expressed DCC gene. 2. In the promoter methylation specific PCR analysis, 5(41.6%) of 12 specimens showed promoter methylation of DCC gene. 3. In the immunohistochemical staining of poor differentiated and invasive oral squamous cell carcinoma, loss of DCC expression was observed. These findings suggest that methylation of the DCC gene may play a role in loss of gene expression in invasive oral squamous cell carcinoma.

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