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Flotillins directly interact with γ-catenin and regulate epithelial cell-cell adhesion
Nina Kurrle1, Frauke Völlner1, Rüdiger Eming2
1Institute of Biochemistry, Medical Faculty, Justus Liebig University, Giessen, Germany.
Plos One
|January 7, 2014
Summary
Flotillins are proteins involved in cell adhesion. This study shows flotillin-2 interacts with E-cadherin and gamma-catenin, impacting adherens junction structure and raft association in epithelial cells.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Flotillins (flotillin-1 and flotillin-2) are homologous, membrane raft-associated proteins.
- Their precise function in cell-cell adhesion, particularly in non-malignant cells, remains unclear.
- Flotillins are implicated in breast cancer progression, suggesting therapeutic potential.
Purpose of the Study:
- To investigate the function of flotillins in cell-cell adhesion in non-malignant epithelial cells.
- To elucidate the interaction network of flotillins within cell-cell adhesion complexes.
- To determine the effect of flotillins on adherens junction structure and protein-membrane raft association.
Main Methods:
- Utilized non-malignant epithelial MCF10A cells.
- Employed RNA interference (RNAi) to deplete flotillins.
- Analyzed protein interactions and localization within membrane rafts.
- Mapped protein interaction domains using in vitro assays.
Main Results:
- Flotillin-2 associates with cadherins in adherens junctions in MCF10A and other human cell lines.
- Flotillin-1 and flotillin-2 directly interact with γ-catenin, specifically within its Armadillo domains 6-8 (ARM domain 7).
- Flotillin depletion altered adherens junction morphology and the membrane raft association of E-cadherin and γ-catenin.
Conclusions:
- Flotillins, particularly flotillin-2, play a functional role in cell-cell adhesion in non-malignant epithelial cells.
- Flotillins are involved in regulating the structure and composition of adherens junctions.
- Findings suggest flotillins are key regulators of E-cadherin and γ-catenin localization within membrane rafts.
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