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Molecular and Cellular Biology, August 1999, p. 5696-5706, Vol. 19, No. 8
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Neoplastic Transformation of RK3E by Mutant
-Catenin Requires Deregulation of Tcf/Lef Transcription but Not
Activation of c-myc Expression
Frank T.
Kolligs,1
Gang
Hu,1
Chi V.
Dang,2 and
Eric R.
Fearon1,3,4,*
Division of Molecular Medicine & Genetics and
the Cancer Center, Departments of Internal
Medicine,1 Human
Genetics,3 and
Pathology,4 University of Michigan
School of Medicine, Ann Arbor, Michigan 48109, and Department
of Medicine and the Oncology Center, Johns Hopkins University School of
Medicine, Baltimore, Maryland 212052
Received 8 March 1999/Returned for modification 19 April
1999/Accepted 12 May 1999
Current models predict that
-catenin (
-cat) functions in Wnt
signaling via activation of Tcf/Lef target genes and that its abundance
is regulated by the adenomatous polyposis coli (APC) and glycogen
synthase kinase 3
(GSK3
) proteins. In colon and other cancers,
mutations in APC or presumptive GSK3
phosphorylation sites of
-cat are associated with constitutive activation of Tcf/Lef
transcription. In spite of assumptions about its oncogenic potential,
prior efforts to demonstrate that mutated
-cat will induce
neoplastic transformation have yielded equivocal results. We report
here that mutated, but not wild-type,
-cat proteins induced
neoplastic transformation of RK3E, an adenovirus E1A-immortalized epithelial cell line. Analysis of the properties of mutant
-cat proteins and studies with a dominant negative Tcf-4 mutant indicated that the ability of
-cat to bind and activate Tcf/Lef factors is
crucial for transformation. c-myc has recently been
implicated as a critical Tcf-regulated target gene. However,
c-myc was not consistently activated in
-cat-transformed
RK3E cells, and a dominant negative c-Myc mutant protein failed to
inhibit
-cat transformation. Our findings underscore the role of
-cat mutations and Tcf/Lef activation in cancer and illustrate a
useful system for defining critical factors in
-cat transformation.
*
Corresponding author. Mailing address: Division of
Molecular Medicine & Genetics, University of Michigan Medical Center,
4301 MSRB 3, 1150 W. Medical Center Dr., Ann Arbor, MI 48109-0638. Phone: (734) 764-1549. Fax: (734) 647-7979. E-mail:
fearon{at}umich.edu.
Molecular and Cellular Biology, August 1999, p. 5696-5706, Vol. 19, No. 8
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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90: 340-347
[Abstract]
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