Noncanonical Wnt11 inhibits hepatocellular carcinoma cell proliferation and migration.

Molecular Cancer Research : MCR
Takashi ToyamaMiran Kim

Abstract

The canonical Wnt signaling is frequently activated due to overexpression and/or mutations in components of this pathway in hepatocellular carcinoma (HCC). However, the biological role of noncanonical Wnt-mediated signaling in HCC with respect to the signaling pathways involved and their physiologic function is unknown. Here, we report the role of Wnt11, a member of the noncanonical cascade, in hepatic oncogenesis. The expression levels of Wnt11 mRNA and protein were significantly downregulated in human HCC tumors compared with the adjacent uninvolved liver as measured by quantitative real-time reverse transcription-PCR and Western blot analysis. In human HCC cell lines, overexpression of Wnt11 activated protein kinase C signaling. Protein kinase C antagonized the canonical signaling through phosphorylation of beta-catenin and reduced T-cell factor-mediated transcriptional activity, resulting in a decrease of cell proliferation. Furthermore, ectopic expression of Wnt11 promotes RhoA/Rho kinase activation. We found that activated Rho kinase inhibited Rac1 to reduce cell motility and migration. These observations suggest a novel role for Wnt11 as a tumor suppressor during hepatocarcinogenesis because loss of expression promotes t...Continue Reading

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