PMID: 11920632Mar 29, 2002Paper

Promoter hypermethylation of the EDNRB gene in nasopharyngeal carcinoma

International Journal of Cancer. Journal International Du Cancer
Kwok-Wai LoDolly P Huang

Abstract

To identify the epigenetic changes in nasopharyngeal carcinoma (NPC), we performed methylation-sensitive restriction fingerprinting (MSRF) analysis on NPC cell lines and xenografts. A 190 bp sequence methylated in NPC tumors was isolated and showed high homology to the 5' CpG island of the endothelin receptor B (EDNRB) gene. Since the EDNRB gene is commonly inactivated in prostate and bladder cancers, it may be a candidate target gene involved in NPC tumorigenesis. By bisulfite sequencing, we have confirmed that hypermethylation of the 5' CpG island of EDNRB occurred in both xenografts and all 4 cell lines but not in 2 normal nasopharyngeal outgrowths. RT-PCR demonstrated that only original EDNRB transcripts, but not the splicing transcripts, were expressed in normal nasopharyngeal epithelial cells. Loss of the original EDNRB expression was consistently found in 2 xenografts and 3 cell lines with dense methylation patterns. Treatment of these 3 cell lines with 5'-aza-2'-deoxycytidine led to re-expression of the EDNRB transcript and demethylation of its promoter regions. Our results demonstrate that silencing of EDNRB gene expression in NPC is associated with promoter hypermethylation. Using methylation-specific PCR, we also det...Continue Reading

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Citations

Sep 30, 2004·International Journal of Cancer. Journal International Du Cancer·Joseph KwongDolly P Huang
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