Downloads provided by UsageCountsα-Spectrin and integrins act together to regulate actomyosin and columnarization, and to maintain a monolayered follicular epithelium
α-Spectrin and integrins act together to regulate actomyosin and columnarization, and to maintain a monolayered follicular epithelium
The Spectrin cytoskeleton crosslinks actin to the membrane, and although it has been greatly studied in erythrocytes, much is unknown about its function in epithelia. We have studied the role of Spectrins during epithelia morphogenesis using the Drosophila follicular epithelium (FE). As previously described, we show that α-Spectrin and β-Spectrin are essential to maintain a mono-layered FE, but, contrary to previous work, Spectrins are not required to control proliferation. Furthermore, spectrin cells show differentiation and polarity defects only in the ectopic layers of stratified epithelia, similar to integrin mutants. Our results identify α-Spectrin and integrins as novel regulators of apical constriction-independent cell elongation, as α-spectrin and integrin cells fail to columnarize. Finally, we show that increasing and reducing the activity of the Rho1-myosin-II pathway enhances and decreases multi-layering of α-spectrin cells, respectively. Similarly, higher myosin-II activity enhances the integrin multi-layering phenotype. This work identifies a primary role for α-Spectrin in controlling cell shape, perhaps by modulating actomyosin. All together, we suggest that a functional Spectrin-Integrin complex is essential to balance adequate forces, in order to maintain a mono-layered epithelium.
- University of Cambridge United Kingdom
- Wellcome Trust United Kingdom
- Pablo de Olavide University Spain
- Spanish National Research Council Spain
- Centro Andaluz de Biología del Desarrollo Spain
Integrins, Proliferation, Mitosis, Tissue architecture, Epithelium, Ovarian Follicle, Tumor-like mass, Animals, Drosophila Proteins, Cell Shape, Cytoskeleton, Monolayer, Cell Polarity, Spectrin, Cell Differentiation, Actomyosin, Mutation, Oocytes, Cell shape, Drosophila, Female, Research Article
Integrins, Proliferation, Mitosis, Tissue architecture, Epithelium, Ovarian Follicle, Tumor-like mass, Animals, Drosophila Proteins, Cell Shape, Cytoskeleton, Monolayer, Cell Polarity, Spectrin, Cell Differentiation, Actomyosin, Mutation, Oocytes, Cell shape, Drosophila, Female, Research Article
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