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Analyzing the Function of Small GTPases by Microinjection of Plasmids into Polarized Epithelial Cells
Published on: May 31, 2011
Desmosome Assembly Regulates Apical-Basal Polarization and Nuclear Shape in Simple Epithelial Cells
Tobuhiro Nita1, Junya Hayase1, Akira Kohda1
1Department of Biochemistry, Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan.
Desmosome assembly in simple epithelia involves E-cadherin and cadherin-6 recruiting plakoglobin, which then recruits other proteins for desmosome formation. Desmoplakin is crucial for cell polarity and nuclear shape.
Area of Science:
- Cell Biology
- Epithelial Biology
- Molecular Cell Biology
Background:
- Desmosomes provide tissue integrity by anchoring keratin filaments.
- Desmosome assembly mechanisms in simple epithelia are less understood than in stratified epithelia.
Purpose of the Study:
- To elucidate the mechanism of desmosome assembly in simple epithelia.
- To investigate the role of desmoplakin in cell polarity and nuclear morphology.
Main Methods:
- Utilized Madin-Darby canine kidney (MDCK) cells in 2D and 3D culture.
- Employed calcium-induced desmosome formation assays.
- Investigated protein recruitment and localization using depletion studies.
Main Results:
- E-cadherin (E-cad) and cadherin-6 (Cdh6) recruit plakoglobin (Pg) for desmosome assembly.
- Plakoglobin (Pg), plakophilin-2 (PKP2), and plakophilin-3 (PKP3) facilitate the localization of desmoglein-2 (Dsg2), desmocollin-2 (Dsc2), and desmoplakin (DP).
- Desmoplakin (DP) is essential for establishing apical-basal cell polarity during cystogenesis and regulates nuclear shape.
Conclusions:
- A novel pathway for desmosome assembly in simple epithelia involving E-cad/Cdh6 and Pg is described.
- Desmoplakin plays a critical role in epithelial polarity and nuclear morphology maintenance.
- Proper desmosome formation and keratin network integrity are linked to nuclear shape regulation.
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