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Madin Darby Canine Kidney (MDCK) Cells: Early & Late Passage

ABSTRACT: The paracellular passage of ions in epithelial systems is dictated by the repertoire of tight junction (TJ) proteins, the number and architecture of apicolateral TJ strands, and the interaction of TJ proteins with the cytoskeleton. To investigate the relative contribution of these factors and to explore their regulation, we examined a passage number dependent phenotypic change in Madin Darby Canine Kidney (MDCK) cells iteratively passaged at low density in which dilution potentials of the monolayer abruptly decreased but transepithelial resistance (TER) progressively increased. Here, we report that the phenotypic transition involved a decrease surface expression of peanut agglutinin (PNA), a decrease in steady state levels of claudin-1 and a slight decrease in E-cadherin expression in the context of an apparently claudin-2-negative system. Late passage cells grew in more densely packed monolayers and exhibited characteristics of a competent, functional cultured monolayer including inducible vectorial ion transport in response to norepinephrine (NE) and sphere formation in three dimensional laminin gel culture. Microarray analysis of gene expression levels in early and late passage cells revealed an increase in transcript abundance for SGK and GLUT-3, and a reduction Id-3. The steady state protein expression levels of GLUT-3, however, were found to be equivalent. These findings suggest that the expression of claudin-2 in MDCK cells could be contingent on signaling via lateral cell contacts and that claudin-1, in the context of sustained claudin-8 expression, could function as a negative regulator of overall TER.

ORGANISM(S): Canis lupus familiaris

PROVIDER: GSE14837 | GEO | 2010/02/13

SECONDARY ACCESSION(S): PRJNA112103

REPOSITORIES: GEO

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Project description:Purpose: WNT signaling activation in colorectal cancers (CRCs) occurs mainly through APC inactivation or, more uncommonly, β-catenin activation. Both processes promote β-catenin nuclear accumulation, which transcriptionally up-regulates epithelial-to-mesenchymal transition (EMT)-related genes. Experimental Design: We investigated β-catenin localization, downstream gene expression, and phenotypic alterations in HCT116 cells containing a wild-type (HCT116-WT) or mutant β-catenin allele (HCT116-MT), or parental cells with both WT and mutant alleles (HCT116-P). We then analyzed β-catenin localization and associated phenotypes in CRC tissues. Results: Wild-type β-catenin mainly localized at the cell membrane, whereas mutant showed predominantly nuclear localization; membranous, cytoplasmic, and nuclear localization was observed in HCT116-P cells. Microarray analysis revealed significant down-regulation of Claudin-7 and E-cadherin in HCT116-MT vs. HCT116-WT cells. Claudin-7 was also down-regulated in HCT116-P vs. HCT116-WT cells, although E-cadherin expression was unaffected. Altered expression of cell-cell junction-related molecules led to tight junction (TJ) impairment in HCT116-P, and dual loss of TJs and adherens junctions (AJs) in HCT116-MT. TJ loss increased migration and invasion activities of HCT116-WT, whereas AJ loss was required to further up-regulate these activities in HCT116-P. Immunohistochemistry analysis of 101 stage III CRC tissues revealed high nuclear β-catenin expression (≥30% of tumor cells) in 15 (14.9%) samples, low nuclear expression (1-29%) in 53 (52.5%) samples, and undetectable nuclear expression in 33 (32.6%) samples, with a trend toward more frequent down-regulation of Claudin-7 and E-cadherin, and increased metastasis in CRCs with high vs. low nuclear β-catenin. Conclusions: β-catenin activation and nuclear translocation induce EMT progression by modifying cell-cell junctions, and are associated with aggressive behaviors of CRCs.

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Madin Darby Canine Kidney (MDCK) Cells: Early & Late Passage

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