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Tytuł pozycji:

Protocadherin 17 functions as a tumor suppressor suppressing Wnt/β-catenin signaling and cell metastasis and is frequently methylated in breast cancer

Tytuł :
Protocadherin 17 functions as a tumor suppressor suppressing Wnt/β-catenin signaling and cell metastasis and is frequently methylated in breast cancer
Autorzy :
Yin, Xuedong
Xiang, Tingxiu
Mu, Junhao
Mao, Haitao
Li, Lili
Huang, Xin
Li, Chunhong
Feng, Yixiao
Luo, Xinrong
Wei, Yuxian
Peng, Weiyan
Ren, Guosheng
Tao, Qian
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Temat :
β-catenin
methylation
tumor suppressor
cancer
Research Paper
PCDH17
Źródło :
Oncotarget. 7
Wydawca :
Impact Journals LLC, 2016.
Rok publikacji :
2016
Oryginalny identyfikator :
pmc: PMC5239510
pmid: 27351130
Język :
English
ISSN :
1949-2553
DOI :
10.18632/oncotarget.10102
Protocadherins play important roles in the regulation of cell adhesion and signaling transduction. Aberrant expression of protocadherins has been shown to be associated with multiple tumorigenesis. We previously identified PCDH17, encoding protocadherin 17, as a frequently methylated and downregulated tumor suppressor gene (TSG) in gastric and colorectal cancers. Here, we examined the abnormalities and functions of PCDH17 in breast cancer pathogenesis. We used PCR and immunohistochemistry to check its expression pattern in breast tumor cell lines and primary tumors. Methylation-specific PCR (MSP) was applied to examine its promoter methylation status in breast tumor cell lines and primary tumors. The biological functions of PCDH17 in breast tumor cells were assessed using in vitro and in vivo assays. We found that PCDH17 was frequently downregulated or silenced in 78% (7/9) of breast tumor cell lines, as well as 89% (32/36) of primary tumors. Downregulation of PCDH17 in breast cancer was mainly due to the methylation of its promoter. Ectopic expression of PCDH17 in breast tumor cells inhibited cell proliferation and mobility through arresting cell cycle and inducing apoptosis. In breast tumor cells, PCDH17 significantly suppressed the active β-catenin level and its downstream target gene expression. Thus, we found that PCDH17 functions as a tumor suppressor inhibiting Wnt/β-catenin signaling and metastasis in breast cancer but is frequently methylated in primary tumors which could be a potential biomarker.

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