TY - JOUR
T1 - Epigenetic identification of receptor tyrosine kinase-like orphan receptor 2 as a functional tumor suppressor inhibiting β-catenin and AKT signaling but frequently methylated in common carcinomas
AU - Li, Lili
AU - Ying, Jianming
AU - Tong, Xin
AU - Zhong, Lan
AU - Su, Xianwei
AU - Xiang, Tingxiu
AU - Shu, Xingsheng
AU - Rong, Rong
AU - Xiong, Lei
AU - Li, Hongyu
AU - Chan, Anthony T.C.
AU - Ambinder, Richard F.
AU - Guo, Yajun
AU - Tao, Qian
N1 - Funding Information:
We thank Drs. George Tsao, Sun Young Rha, Bert Vogelstein, and Michael Obster for some cell lines, DSMZ (German Collection of Microorganisms and Cell Cultures) for the KYSE cell lines (Shimada et al., Cancer 69: 277-284, 1992). This study was supported by grants from National Natural Science Foundation (No. 81372898 and 81172582), Hong Kong RGC (GRF # 474710), and Group Research Schemes of The Chinese University of Hong Kong.
PY - 2014/6
Y1 - 2014/6
N2 - Through subtraction of tumor-specific CpG methylation, we identified receptor tyrosine kinase-like orphan receptor 2 (ROR2) as a candidate tumor suppressor gene (TSG). ROR2 is a specific receptor or co-receptor for WNT5A, involved in canonical and non-canonical WNT signaling, with its role in tumorigenesis controversial. We characterized its functions and related cell signaling in common carcinomas. ROR2 was frequently silenced by promoter CpG methylation in multiple carcinomas including nasopharyngeal, esophageal, gastric, colorectal, hepatocellular, lung, and breast cancers, while no direct correlation of ROR2 and WNT5A expression was observed. Ectopic expression of ROR2 resulted in tumor suppression independent of WNT5A status, through inhibiting tumor cell growth and inducing cell cycle arrest and apoptosis. ROR2 further suppressed epithelial-mesenchymal transition and tumor cell stemness through repressing β-catenin and AKT signaling, leading to further inhibition of tumor cell migration/invasion and increased chemo-sensitivity. Thus ROR2, as an epigenetically inactivated TSG, antagonizes both β-catenin and AKT signaling in multiple tumorigenesis. Its epigenetic silencing could be a potential tumor biomarker and therapeutic target for carcinomas.
AB - Through subtraction of tumor-specific CpG methylation, we identified receptor tyrosine kinase-like orphan receptor 2 (ROR2) as a candidate tumor suppressor gene (TSG). ROR2 is a specific receptor or co-receptor for WNT5A, involved in canonical and non-canonical WNT signaling, with its role in tumorigenesis controversial. We characterized its functions and related cell signaling in common carcinomas. ROR2 was frequently silenced by promoter CpG methylation in multiple carcinomas including nasopharyngeal, esophageal, gastric, colorectal, hepatocellular, lung, and breast cancers, while no direct correlation of ROR2 and WNT5A expression was observed. Ectopic expression of ROR2 resulted in tumor suppression independent of WNT5A status, through inhibiting tumor cell growth and inducing cell cycle arrest and apoptosis. ROR2 further suppressed epithelial-mesenchymal transition and tumor cell stemness through repressing β-catenin and AKT signaling, leading to further inhibition of tumor cell migration/invasion and increased chemo-sensitivity. Thus ROR2, as an epigenetically inactivated TSG, antagonizes both β-catenin and AKT signaling in multiple tumorigenesis. Its epigenetic silencing could be a potential tumor biomarker and therapeutic target for carcinomas.
KW - Carcinoma
KW - Epigenetic
KW - Methylation
KW - ROR2
KW - Tumor suppressor
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U2 - 10.1007/s00018-013-1485-z
DO - 10.1007/s00018-013-1485-z
M3 - Article
C2 - 24158497
AN - SCOPUS:84901686744
SN - 1420-682X
VL - 71
SP - 2179
EP - 2192
JO - Cellular and Molecular Life Sciences
JF - Cellular and Molecular Life Sciences
IS - 11
ER -