Wnt inhibitory factor-1 functions as a tumor suppressor through modulating Wnt/β-catenin signaling in neuroblastoma

Neuroblastoma is the most common extracranial solid tumor in childhood and is associated with serious morbidity and mortality. The effective treatment of neuroblastoma remains one of the major challenges in pediatric oncology. The Wnt signaling pathway has been shown to play a significant role in the pathogenesis of adult and pediatric tumors. WIF-1 has been identified as an important Wnt antagonist which inhibits Wnt/β-catenin signaling by directly binding to Wnt proteins. However, the expression and function of WIF-1 in neuroblastoma remains unknown. The present study showed that WIF-1 was downregulated with high level promoter methylation in neuroblastoma cells, and was significantly upregulated after exposure to demethylating agent. This finding suggests that downregulation of WIF-1 was associated with its promoter methylation in neuroblastoma. To further study the potential function of WIF-1 in neuroblastoma, we constructed a plasmid that over-expressed WIF-1 and transfected the plasmid into one neuroblastoma cell line SK-N-SH. We found that restoration of WIF-1 inhibited the growth and proliferation of neuroblastoma cells in vitro. Morever, Wnt/β-catenin signaling activity and target genes expression were reduced by WIF-1 restoration. These results provide support that WIF-1 is downregulated and functions as a tumor suppressor by antagonizing Wnt/β-catenin signaling in neuroblastoma, suggesting a potential role as a therapeutic target in neuroblastoma.

Zhou, BinIWest China Hospital, Sichuan University, Chengdu, China (author)
Liu, YinghuaDWest China Hospital, Sichuan University, Chengdu, China (author)
Chen, KelingWest China Hospital, Sichuan University, Chengdu, China (author)
Bao, PingqianWest China Hospital, Sichuan University, Chengdu, China (author)
Wang, YiWest China Hospital, Sichuan University, Chengdu, China (author)
Wang, JiaxiangFirst Affiliated Hospital of Zhengzhou University, Henan, China (author)
Zhou, ZongguangWest China Hospital, Sichuan University, Chengdu, China (author)
Sun, Xiao-FengÖstergötlands Läns Landsting,Linköpings universitet,Avdelningen för kliniska vetenskaper,Hälsouniversitetet,Onkologiska kliniken US,nstitute of Digestive Surgery, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China(Swepub:liu)xiasu45 (author)
Li, YuanWest China Hospital, Sichuan University, Chengdu, China (author)
West China Hospital, Sichuan University, Chengdu, ChinaIWest China Hospital, Sichuan University, Chengdu, China (creator_code:org_t)

By the author/editor: Zhang, Jiao; Zhou, Bin; Liu, Yinghua; Chen, Keling; Bao, Pingqian; Wang, Yi; show more...; Wang, Jiaxiang; Zhou, Zongguang; Sun, Xiao-Feng; Li, Yuan; show less...

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MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Cancer and Oncol ...

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Basic Medicine; and Cell and Molecul ...

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