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All rights reserved. http://resource.belframework.org/belframework/20131211/knowledge/large_corpus.bel http://purl.org/dc/elements/1.1/title BEL Framework Large Corpus Document http://resource.belframework.org/belframework/20131211/knowledge/large_corpus.bel http://purl.org/pav/authoredBy http://www.tkuhn.ch/bel2nanopub/RAw3ZUIA55dKqK36pAOl2lg-00f513JrTo2DbA3bFHb1Y#_6 http://resource.belframework.org/belframework/20131211/knowledge/large_corpus.bel http://purl.org/pav/version 20131211 http://www.tkuhn.ch/bel2nanopub/RAw3ZUIA55dKqK36pAOl2lg-00f513JrTo2DbA3bFHb1Y#_5 http://www.w3.org/ns/prov#value We found that Dickkopf (Dkk)-3, a member of Dkk family of Wnt antagonists, is frequently inactivated in lung cancer and plays a role in suppressing lung cancer cell growth through inhibition of beta-catenin/T-cell factor (TCF)-4 signaling. Dkk3 is the only Dkk family member abundantly expressed in normal lung, but silenced by promoter hypermethylation in a large fraction of lung cancer cell lines and lung tumors. Downregulation of Dkk3 was correlated with tumor progression and expression of nuclear beta-catenin in lung tumors. Ectopic expression of Dkk3 in lung cancer cells with Dkk3 hypermethylation induced apoptosis and inhibited TCF-4 activity as well as nuclear accumulation of beta-catenin and expression of TCF-4 targets c-Myc and cyclin D1. Furthermore, small interference RNA knock down of Dkk3 in cells lacking Dkk3 hypermethylation was sufficient to promote cell proliferation, beta-catenin nuclear translocation and expression of c-Myc. 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