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Pediatric and Developmental Pathology

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01.08.2005 | Original Article

β-Catenin and Met Deregulation in Childhood Hepatoblastomas

verfasst von: Sarangarajan Ranganathan, Xinping Tan, Satdarshan P. S. Monga

Erschienen in: Pediatric and Developmental Pathology | Ausgabe 4/2005

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ABSTRACT

Activation of the Wnt/β-catenin and hepatocyte growth factor/Met signaling has been implicated in various tumors. Owing to the cross-talk between these pathways and aberrant redistribution of β-catenin in hepatoblastomas, we examined their status in this tumor. This study examined changes in β-catenin and Met in paired pretreatment and post-treatment hepatoblastoma tissues in relation to their effects on proliferation and target genes such as c-myc and cyclin-D1. In this study we compared proliferation indices, β-catenin staining and its known molecular targets, c-myc and cyclin-D1, and Met, a tyrosine kinase receptor for hepatocyte growth factor in pretreatment and post-treatment specimens. Pretreatment and post-treatment sections from 13 children, ages 11 weeks to 9 years, were analyzed for these markers by immunohistochemistry. All tumors (13 of 13) displayed increased proliferation and β-catenin (cytoplasmic and nuclear) staining in pretreatment biopsies that remained relatively unaffected after treatment. Aberrant Met staining (cytoplasmic) was observed in all pretreatment samples that decreased considerably after treatment in 11 of 13 patients. A significant subset of these tumors showed increased c-myc and cyclin-D1 staining in pretreatment biopsies that decreased after chemotherapy in most cases. β-Catenin redistribution in tumor cells corresponds to proliferation in hepatoblastomas. However, β-catenin nuclear localization remains unaffected in viable hepatoblastoma tissue after chemotherapy. In contrast, Met undergoes a prominent decrease after treatment and thus might be important in pathogenesis of hepatoblastoma.

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Titel: β-Catenin and Met Deregulation in Childhood Hepatoblastomas
verfasst von: Sarangarajan Ranganathan
Xinping Tan
Satdarshan P. S. Monga
Publikationsdatum: 01.08.2005
Verlag: Springer-Verlag
Erschienen in: Pediatric and Developmental Pathology / Ausgabe 4/2005
Print ISSN: 1093-5266
Elektronische ISSN: 1615-5742
DOI: https://doi.org/10.1007/s10024-005-0028-5

Springer Medizin

β-Catenin and Met Deregulation in Childhood Hepatoblastomas

ABSTRACT

Neu im Fachgebiet Pathologie

Molekularpathologische Untersuchungen im Wandel der Zeit

Vergleichende Pathologie in der onkologischen Forschung

Gastrointestinale Stromatumoren

Personalisierte Medizin in der Onkologie

Springer Medizin

ABSTRACT

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