Abstract
Objectives
Aberrant activation of the Wnt/β-catenin signaling pathway is common in human cancers. Recently, we have shown that secreted frizzled-related proteins (SFRPs) are frequently methylated in cervical squamous cell carcinoma (SCC). Furthermore, reexpression of SFRP1 and SFRP2 could suppress tumor cell transformation and invasion. Here, we want to further investigate the methylation status and function of SFRPs in adenocarcinoma of uterine cervix.
Methods
The methylation status of SFRPs was assessed in 23 adenocarcinomas (AC), and 45 normal control swabs by methylation-specific polymerase chain reaction and bisulfite sequencing. Then, we used reexpression of SFRP5 in cervical cancer cell lines, HeLa3rd and CaSki, to study the role of SFRP5 in cervical adenocarcinoma by colony formation and invasion assays. Finally, we checked whether SFRP5 could repress the expression of Wnt/β-catenin downstream genes by quantitative reverse transcription-polymerase chain reaction.
Results
The frequency of SFRP genes promoter hypermethylation in adenocarcinoma of cervix samples was 52.2% (12/23), 82.6% (19/23), 65.2% (15/23), and 73.9% (17/23), for SFRP1, SFRP2, SFRP4, and SFRP5, respectively. The frequency of SFRP1, SFRP2, SFRP4, and SFRP5 promoter methylation in adenocarcinoma was significantly higher than in normal control samples (P < 0.001). Restoration of SFRP5 suppressed colony formation and invasive ability and inhibited expression of Wnt/β-catenin downstream genes.
Conclusions
Our data suggest that promoter hypermethylation of SFRPs is associated with cervical adenocarcinoma, which could be used for molecular screening of cervical adenocarcinoma in the future. Moreover, SFRP5 inhibits cervical tumorigenesis through interfering Wnt pathway in vitro.
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Abbreviations
- MS-PCR:
-
Methylation-specific polymerase chain reaction
- RT-PCR:
-
Reverse transcription-polymerase chain reaction
- SFRP :
-
Secreted frizzled-related protein
- CpG:
-
Phosphodiester-linked cytosine–guanine pair
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Acknowledgments
We thank Dr. Hiromu Suzuki (First Department of Internal Medicine, Sapporo Medical University, Sapporo, Japan) for kindly providing the construct plasmid. This work was supported in part by National Science Council, Taiwan, Republic of China (ROC); grant numbers: the NSC96-2320-B-016-019-MY2, NSC96-3112-B-016-003, NSC97-3112-B-016-002; the Department of Health, Taiwan, Republic of China; grant number: DOH97-TD-I-111-TM005; Tri-Service General Hospital, Taiwan, ROC; grant numbers: TSGH-C97-7S01-S03; the Armed Forces Tao-Yuan General Hospital, Tao-Yuan, Taiwan, ROC; grant numbers: AFTYGH-9607, AFTYGH-9608.
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We declare that we have no conflict of interest.
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M.-T. Chung and H.-C. Lai contributed equally to this work.
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Lin, YW., Chung, MT., Lai, HC. et al. Methylation analysis of SFRP genes family in cervical adenocarcinoma. J Cancer Res Clin Oncol 135, 1665–1674 (2009). https://doi.org/10.1007/s00432-009-0613-5
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DOI: https://doi.org/10.1007/s00432-009-0613-5