title: Forced expression of deltaN-TCF-1B in colon cancer derived cell lines is accompanied by the induction of CEACAM5/6 and mesothelin.
abstract: The colon cancer cell lines HT29 and SW480 were transfected with an N-terminal beta-catenin binding site-deficient high mobility group (HMG)-box T-cell factor 1 (deltaN-TCF-1) construct to identify differentially expressed genes. Oligonucleotide HG-U133A microarray expression profiling revealed increased mRNA levels of carcinoembryonic antigen-related cell adhesion molecule (CEACAM) 5, 6 and mesothelin in transfectants positive for nuclear deltaN-TCF-1B. Increased amounts of CEACAM5 (CEA) were detectable in membrane-associated compartments, particularly in cholesterol-enriched microdomains. Similarly, mesothelin was demonstrated as an uncleaved membrane-bound constituent. The identified markers were examined in specimens of 46 colorectal carcinomas (CRC) by immunohistochemistry. Patchy areas of increased CEACAM5/6 staining were seen at the tumour-host front in all samples studied. Twenty-eight (58%) of these cases showed over-expression of mesothelin in a small fraction of tumor cells displaying dedifferentiation and dissemination at the invasion front. We conclude that forced expression of deltaN-TCF-1B in HT29 and SW480 is associated with up-regulation of GPI-anchored adhesion molecules, which were assigned to the tumour-host front in CRC patients.
authors.affiliation: Department of Internal Medicine 1, Section Molecular GI Oncology, University of Halle-Wittenberg, Halle, Germany.
authors.forename: Beate
authors.initials: B
authors.lastname: Liebig
authors.forename: Thomas
authors.initials: T
authors.lastname: Brabletz
authors.forename: Martin S
authors.initials: MS
authors.lastname: Staege
authors.forename: Jens
authors.initials: J
authors.lastname: Wulfänger
authors.forename: Dagmar
authors.initials: D
authors.lastname: Riemann
authors.forename: Stefan
authors.initials: S
authors.lastname: Burdach
authors.forename: Wolfgang G
authors.initials: WG
authors.lastname: Ballhausen
mesh_terms: D000951:Antigens, Neoplasm / Q000096:biosynthesis*; D015815:Cell Adhesion Molecules / Q000096:biosynthesis*; D045744:Cell Line, Tumor; D003110:Colonic Neoplasms / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000032:analysis*; D058851:GPI-Linked Proteins; D051537:Hepatocyte Nuclear Factor 1; D051538:Hepatocyte Nuclear Factor 1-alpha; D006801:Humans; D007150:Immunohistochemistry; D008562:Membrane Glycoproteins / Q000096:biosynthesis*; D000090204:Mesothelin; D009687:Nuclear Proteins / Q000032:analysis*; D014157:Transcription Factors / Q000032:analysis*
chemical_list: D000951:Antigens, Neoplasm; D015815:Cell Adhesion Molecules; D004268:DNA-Binding Proteins; D058851:GPI-Linked Proteins; C496487:HNF1A protein, human; D051538:Hepatocyte Nuclear Factor 1-alpha; D008562:Membrane Glycoproteins; D009687:Nuclear Proteins; D014157:Transcription Factors; D051537:Hepatocyte Nuclear Factor 1; D000090204:Mesothelin