Changes in Gene Structure and Regulation of E-Cadherin during Epithelial Development, Differentiation, and Disease
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Cadherin Structure
There are three main types of cell–cell junctions: occluding (tight), anchoring [desmosomal and zonula adherens (ZA)], and communication (GAP junctions or chemical synapses) (Fig. 1). Tight junctions seal off the basolateral aspects of the cell from fluids at the apical border, and this is usually achieved by a unique set of molecules, including ZO-1 and -2. Two subtypes of anchoring junctions are adhesion belts (cell–cell interaction) and basal focal contacts (cell–matrix interactions). The
Interactions between E-Cadherin and Other Cell Adhesion Molecules
In squamous epithelium, integrins and P-cadherin expression occur in the basal cell layer. In the parabasal layers E-cadherin is expressed as P-cadherin and the integrins are down-regulated 38., 39.. Although the exact mechanism of this regulation is not fully elucidated, it has been reported that cotransfection of rat 3Y1 cells with E-cadherin results in the expression of only one type of cadherin and the suppression of endogenous P-cadherin (40). Furthermore, expression of E-cadherin catenin
Adherens Junctions
The classical cadherins have widespread tissue distribution 12., 14., in contrast to the liver–intestine (LI) cadherins (96) (see Table I). The classical cadherins are present in the junctional complexes (both adherens and desmosomal junctions) and organize the actin cytoskeleton at the apical junctional complex. LI cadherins, on the other hand, exert adhesive properties in an even distribution on the basolateral membranes, probably at the desmosomal junctions (96).
Cell-Specific Recognition
Cadherins aet as cell–cell
Defects in Cell Adhesion during Colonic Inflammation—Spatial Changes of E-Cadherin in Vivo
It has been reported that intercellular adhesion molecules are down-regulated in UC (143). Similarly, there is up-regulation of nonfunctional cytoplasmic E-cadherin expression in UC during the inflammatory and granulation phases of epithelial adaptation, whereas the membranous expression decreases. As the disease activity progresses and enters the late remodeling phase, both cytoplasmic and membranous E-cadherin expression is lost altogether, reflecting in part the poor degree of cellular
Conclusions
Cadherins have highly conserved cytoplasmic and extracellular domains between species and among other members of the cadherin family. Each tissue has distinct cadherins and within the tissue; each cell subtype has specific quantities of particular cadherins.
There is qualitative, spatiotemporal expression of cadherins during renal development and subsequendy there is quantitative expression in the final stages of organogenesis 106., 179.. E-Cadherin is a reliable marker of differentiation when
ACKNOWLEDGMENTS
We would like to thank Dr. Inke Nathke, Cell and Molecular Biology Laboratory, University of Stanford, California, and Dr. Marion Bussemakers, Department of Urology, University of Nejmegen, The Netherlands, for participation in helpful discussions during the preparation of this manuscript. Without their comments, the completion of this article would not have been possible due to die complexity and rapid advances in the area of cadherin biology.
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