Identification of the leukocyte cell-derived chemotaxin 2 as a direct target gene of beta-catenin in the liver

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
Christine OvejeroChristine Perret

Abstract

To clarify molecular mechanisms underlying liver carcinogenesis induced by aberrant activation of Wnt pathway, we isolated the target genes of beta-catenin from mice exhibiting constitutive activated beta-catenin in the liver. Adenovirus-mediated expression of oncogenic beta-catenin was used to isolate early targets of beta-catenin in the liver. Suppression subtractive hybridization was used to identify the leukocyte cell-derived chemotaxin 2 (LECT2) gene as a direct target of beta-catenin. Northern blot and immunohistochemical analyses demonstrated that LECT2 expression is specifically induced in different mouse models that express activated beta-catenin in the liver. LECT2 expression was not activated in livers in which hepatocyte proliferation was induced by a beta-catenin-independent signal. We characterized by mutagenesis the LEF/TCF site, which is crucial for LECT2 activation by beta-catenin. We further characterized the chemotactic property of LECT2 for human neutrophils. Finally, we have shown an up-regulation of LECT2 in human liver tumors that expressed aberrant activation of beta-catenin signaling; these tumors constituted a subset of hepatocellular carcinomas (HCC) and most of the hepatoblastomas that were studied. ...Continue Reading

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Aug 6, 2008·The British Journal of Nutrition·Gabrielle VenturaChristophe Moinard
Jul 23, 2008·Molecular and Cellular Biology·Toby J PhesseAlan R Clarke
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