In:
Clinical Cancer Research, American Association for Cancer Research (AACR), Vol. 11, No. 12 ( 2005-06-15), p. 4295-4304
Abstract:
Hepatoblastomas are the most frequent malignant liver tumors of childhood. A high frequency of activating β-catenin mutations in hepatoblastomas indicates that the Wnt signaling pathway plays an important role in the development of this embryonic neoplasm. Stabilization of β-catenin leads to an increased formation of nuclear β-catenin-T-cell factor complexes and altered expression of Wnt-inducible target genes. In this study, we analyzed the mRNA expression levels of nine Wnt genes, including c-JUN, c-MYC, CYCLIN D1, FRA-1, NKD-1, ITF-2, MMP-7, uPAR, and β-TRCP, by competitive reverse transcription-PCR. We analyzed 23 hepatoblastoma biopsies for which matching liver tissue was available, 6 hepatoblastoma cell lines, and 3 human fetal liver samples. β-TRCP and NKD-1 were highly expressed in all hepatoblastoma samples, independent of the β-catenin mutational status, in comparison with their nontumorous counterparts. β-TRCP mRNA overexpression was associated with accumulation of intracytoplasmic and nuclear β-TrCP protein. In human liver tumor cells without β-catenin mutations, Nkd-1 inhibited the Wnt-3a-activated Tcf-responsive-luciferase reporter activity, whereas Nkd-1 in hepatoblastomas with β-catenin mutations had no antagonistic effect. Our data emphasize the inhibitory effect of β-TrCP and Nkd-1 on the Wnt signaling pathway in a manner analogous to Conductin (AXIN2) and Dkk-1, inhibitors shown previously to be up-regulated in hepatoblastomas. Our findings indicate that overexpression of the Wnt antagonists Nkd-1 and β-TrCP reveals an activation of the Wnt signaling pathway as a common event in hepatoblastomas. We propose that Nkd-1 and β-TrCP may be used as possible diagnostic markers for the activated Wnt signaling pathway in hepatoblastomas.
Type of Medium:
Online Resource
ISSN:
1078-0432
,
1557-3265
DOI:
10.1158/1078-0432.CCR-04-1162
Language:
English
Publisher:
American Association for Cancer Research (AACR)
Publication Date:
2005
detail.hit.zdb_id:
1225457-5
detail.hit.zdb_id:
2036787-9
