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Cadmium (Cd2+) disrupts E-cadherin-dependent cell-cell junctions in MDCK cells
1Department of Pharmacology, Midwestern University, Downers Grove, Illinois 60515, USA.
In Vitro Cellular & Developmental Biology. Animal
|July 1, 1997
Summary
Cadmium (Cd2+) disrupts E-cadherin cell junctions in Madin-Darby canine kidney (MDCK) cells. This disruption affects cell adhesion and cytoskeleton, making MDCK cells a suitable model for studying these effects.
Area of Science:
- Cell Biology
- Toxicology
- Epithelial Biology
Background:
- E-cadherin-mediated cell-cell junctions are crucial for epithelial tissue integrity.
- Previous studies demonstrated cadmium (Cd2+) disrupts these junctions in LLC-PK1 cells.
Purpose of the Study:
- To investigate Cd2+ effects on E-cadherin-dependent cell-cell adhesion in Madin-Darby canine kidney (MDCK) cells.
- To validate MDCK cells as a model for studying E-cadherin junction disruption.
Main Methods:
- MDCK cells cultured on permeable supports were exposed to Cd2+ (CdCl2) apically or basolaterally.
- Assessed junction integrity via morphology and transepithelial electrical resistance (TER).
- Monitored E-cadherin localization and actin cytoskeleton organization.
Main Results:
- Cd2+ exposure (10-40 microM) induced cell separation and a significant drop in TER.
- Loss of E-cadherin from cell contacts and actin cytoskeleton reorganization were observed.
- Basolateral Cd2+ exposure yielded more pronounced effects than apical exposure.
Conclusions:
- Cd2+ effectively disrupts E-cadherin-dependent cell-cell junctions in MDCK cells.
- The observed effects are comparable to those in Ca(2+)-free medium.
- MDCK cells are validated as an appropriate model for mechanistic studies of Cd2+-induced junction disruption.