title: Aberrant methylation of CDH13 gene in nasopharyngeal carcinoma could serve as a potential diagnostic biomarker.
abstract: CDH13 encodes a cell adhesion molecule, H-cadherin. In this study, we examined CDH13 methylation in nasopharyngeal carcinoma (NPC). Methylation specific PCR results showed that CDH13 was methylated in 20% (1/5) NPC cell lines, 100% (2/2) NPC xenografts and 89.7% (52/58) of the NPC primary tumors, while only methylated in 10% (1/10) normal nasopharyngeal epithelia (P<0.05). CDH13 expression in NPC cell lines and NPC xenografts analyzed by RT-PCR showed that expressions of CDH13 were reversely correlated with their methylation status. In CDH13-silenced cell line, demethylating agent 5-aza-deoxycytidine could dramatically restore CDH13 expression. Taken together, CDH13 promoter is aberrantly methylated in NPC both in vitro and in vivo, and promoter methylation plays a pivotal role in the silencing of H-cadherin expression. Furthermore, the high sensitivity (81%) and specificity (0% false positives) of detecting CDH13 methylation from nasopharyngeal swabs suggest it could be utilized as a tool for early diagnosis.
authors.affiliation: Microbiology and Tumor Biology Center, Karolinska Institutet, Stockholm S-17177, Sweden.
authors.forename: Di
authors.initials: D
authors.lastname: Sun
authors.forename: Zhe
authors.initials: Z
authors.lastname: Zhang
authors.forename: Do Nguyen
authors.initials: do N
authors.lastname: Van
authors.forename: Guangwu
authors.initials: G
authors.lastname: Huang
authors.forename: Ingemar
authors.initials: I
authors.lastname: Ernberg
authors.forename: Lifu
authors.initials: L
authors.lastname: Hu
mesh_terms: D014408:Biomarkers, Tumor / Q000378:metabolism; D015820:Cadherins / Q000235:genetics* / Q000378:metabolism; D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000378:metabolism; D019175:DNA Methylation; D006801:Humans; D009303:Nasopharyngeal Neoplasms / Q000235:genetics* / Q000378:metabolism; D011401:Promoter Regions, Genetic; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013447:Sulfites / Q000737:chemistry
chemical_list: D014408:Biomarkers, Tumor; D015820:Cadherins; C099972:H-cadherin; D013447:Sulfites