Hepatocyte nuclear factor (HNF)-4α triggers formation of functional tight junctions and establishment of polarized epithelial morphology in F9 embryonal carcinoma cells
| Autor: | Seiro Satohisa, Norimasa Sawada, Hideki Chiba, Takashi Kojima, Makoto Osanai, Keisuke Kikuchi, Tomoko Gotoh |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Embryonal Carcinoma Stem Cells
medicine.drug_class Biology Occludin Models Biological digestive system Tight Junctions Mice Cell polarity medicine Animals Retinoid Claudin Cell Size Epithelial polarity Tight junction Basic Helix-Loop-Helix Leucine Zipper Transcription Factors Stem Cells Cell Polarity Gene Expression Regulation Developmental Membrane Proteins Cell Differentiation Epithelial Cells Cell Biology Phosphoproteins Cell biology DNA-Binding Proteins Hepatocyte nuclear factors Epidermal Cells Hepatocyte Nuclear Factor 4 Nuclear receptor Doxycycline Claudins Neoplastic Stem Cells Epidermis Transcription Factors |
| Zdroj: | Experimental Cell Research. 286:288-297 |
| ISSN: | 0014-4827 |
| DOI: | 10.1016/s0014-4827(03)00116-2 |
| Popis: | F9 murine embryonal carcinoma cells provide an attractive system for facilitating molecular mechanisms for epithelial morphogenesis, since they have the capability of differentiating into polarized epithelial cells bearing an apical junctional complexes. We previously showed that a specific retinoid X receptor-retinoic acid receptor heterodimer transduced retinoid signals for biogenesis of functional tight junctions in F9 cells (Exp. Cell Res. 263, (2001) 163). In the present study we generated F9 cells expressing doxycycline-inducible hepatocyte nuclear factor (HNF)-4alpha, a nuclear receptor. We herein show that induction of HNF-4alpha initiates differentiation of F9 cells to polarized epithelial cells, in which tight-junction proteins occludin, claudin-6, claudin-7, and ZO-1 are concentrated at the apical-most regions of lateral membranes. Expression of occludin, claudin-6, and claudin-7 was induced in the cells by doxycycline treatment in a dose- and time-dependent manner, in terms of the amount of HNF-4alpha. In contrast, expression levels of ZO-1, ZO-2, E-cadherin, and beta-catenin were not altered by HNF-4alpha. We also demonstrate, by analysis of diffusion of labeled sphingomyelin, that the fence function of tight junctions is achieved by induction of HNF-4alpha. These findings indicate that HNF-4alpha triggers de novo formation of functional tight junctions and establishment of epithelial cell polarity. |
| Databáze: | OpenAIRE |
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