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  • Title: RYK, a receptor of noncanonical Wnt ligand Wnt5a, is positively correlated with gastric cancer tumorigenesis and potential of liver metastasis.
    Author: Fu Y, Chen Y, Huang J, Cai Z, Wang Y.
    Journal: Am J Physiol Gastrointest Liver Physiol; 2020 Feb 01; 318(2):G352-G360. PubMed ID: 31869240.
    Abstract:
    Gastric cancer (GC) is the most prevalent human cancer around the globe. In GC, Wnt signaling is deregulated, and receptor-like tyrosine kinase (RYK) coreceptors have been identified to interact with noncanonical Wnt ligand Wnt5a. We, therefore, aimed to evaluate the role of RYK in GC development and metastasis. GC tumor samples were collected from 250 GC patients. Expressions of RYK, as well as markers for the epithelial-mesenchymal transition (EMT), such as N-cadherin and E-cadherin, were subjected to correlation analysis with clinicopathological features. Endogenous RYK expression levels were compared in GC cell lines with ascending metastatic potentials followed by stable RYK knockdown. Effect of RYK knockdown on GC cell migration, invasion, and EMT phenotype were assessed in vitro, and on GC tumor growth in vivo in a xenograft rodent model. Particularly, liver metastasis potential of tail vein-injected GC cells was also analyzed following RYK knockdown. RYK was highly correlated with liver metastasis of GC tumors and the expression profiles of EMT markers toward the mesenchymal tendency. RYK expression was also positively correlated with the metastasis potential of GC cells. RYK knockdown not only inhibited migration, invasion, and EMT of GC cells in vitro, but also suppressed tumorigenesis and liver metastasis of GC cells in vivo using the mouse xenograft model. RYK is highly correlated with GC tumorigenesis and potential of liver metastasis, suggesting it may be a novel oncogenic factor of the noncanonical Wnt signaling pathway contributing to GC.NEW & NOTEWORTHY RYK is highly correlated with gastric cancer tumorigenesis and the potential of liver metastasis, suggesting it may be a novel oncogenic factor of the noncanonical Wnt signaling pathway contributing to gastric cancer.
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