Abstract:
BACKGROUND:Necdin (NDN) expression is downregulated in telomerase-immortalised normal human urothelial cells. Telomerase-immortalised normal human urothelial cells have no detected genetic alterations. Accordingly, many of the genes whose expression is altered following immortalisation are those for which epigenetic silencing is reported. METHODS:NDN expression was examined in normal tissues and tumour cell lines by quantitative real-time PCR and immunoblotting. Immunohistochemistry was performed on urothelial carcinoma (UC). Urothelial carcinoma and UC cell lines were subject to HumanMethylation27 BeadChip Array-based methylation analyses. Mutation screening was performed. The functional significance of NDN expression was investigated using retroviral-mediated downregulation or overexpression. RESULTS:NDN protein was widely expressed in normal tissues. Loss of expression was observed in 38 out of 44 (86%) of UC cell lines and 19 out of 25 (76%) of non-UC cell lines. Loss of NDN protein was found in the majority of primary UC. Oncomine analysis demonstrated downregulation of expression in multiple tumour types. In UC, tumour-specific hypermethylation of NDN and key CpG sites where hypermethylation correlated with reduced expression were identified. Six novel mutations, including some of predicted functional significance, were identified in colorectal and ovarian cancer cell lines. Functional studies showed that NDN could suppress colony formation at low cell density and affect anchorage-independent growth and anoikis in vitro. CONCLUSION:NDN is a novel tumour suppressor candidate that is downregulated and hypermethylated or mutated in cancer.
journal_name
Br J Cancerjournal_title
British journal of cancerauthors
De Faveri LE,Hurst CD,Platt FM,Taylor CF,Roulson JA,Sanchez-Carbayo M,Knowles MA,Chapman EJdoi
10.1038/bjc.2013.104subject
Has Abstractpub_date
2013-04-02 00:00:00pages
1368-77issue
6eissn
0007-0920issn
1532-1827pii
bjc2013104journal_volume
108pub_type
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