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Quantitation of Endothelial Cell Adhesiveness In Vitro
Published on: June 18, 2015
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Adducin is involved in endothelial barrier stabilization
Daniela Kugelmann1, Jens Waschke1, Mariya Y Radeva1
1Ludwig-Maximilians-University, Institute of Anatomy and Cell Biology, Department 1, München, Germany.
Plos One
|May 16, 2015
Summary
Alpha-adducin regulates endothelial barrier function by maintaining adherens junction integrity. Its depletion disrupts cell-cell contacts and impairs barrier recovery, highlighting its role in endothelial cell adhesion.
Area of Science:
- Cell Biology
- Endothelial Function
- Cytoskeletal Regulation
Background:
- Adducins are crucial for regulating actin dynamics, essential for endothelial barrier function.
- Previous studies linked adducins to epithelial junction remodeling via actin filament assembly at cell-cell contacts.
Purpose of the Study:
- To investigate the specific role of alpha-adducin in regulating endothelial barrier function.
- To determine how alpha-adducin influences endothelial adherens junction integrity and response to calcium signaling.
Main Methods:
- Utilized human dermal and murine myocardial endothelial cells.
- Employed siRNA-mediated adducin depletion, transendothelial electrical resistance (TER) measurements, and immunofluorescence analysis.
- Induced junctional remodeling using a calcium (Ca2+)-switch assay and analyzed alpha-adducin phosphorylation.
Main Results:
- Adducin depletion impaired endothelial barrier formation and caused VE-cadherin fragmentation.
- Calcium depletion disrupted VE-cadherin and adducin localization, with localization restored upon calcium repletion.
- Alpha-adducin downregulation reduced the recovery of endothelial barrier properties (TER) after calcium repletion.
- Inflammatory mediator-induced barrier breakdown correlated with loss of alpha-adducin from the cell membrane.
Conclusions:
- Alpha-adducin is integral to the remodeling of endothelial adhesion junctions.
- Alpha-adducin plays a significant role in maintaining and restoring endothelial barrier function.
- Alpha-adducin's localization and function are modulated by calcium signaling and PKA phosphorylation.
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