PMID:17166923

Citation	Ninov, N, Chiarelli, DA and Martín-Blanco, E (2007) Extrinsic and intrinsic mechanisms directing epithelial cell sheet replacement during Drosophila metamorphosis. Development 134:367-79
Abstract	The fusion of epithelial sheets is an essential morphogenetic event. Here, we study the development of the abdomen of Drosophila as a model of bounded epithelia expansion and uncover a complex multistep process for the generation of the adult epidermis from histoblasts, founder cells that replace the larval cells during metamorphosis. We find that histoblasts experience a biphasic cell cycle and emit apical projections that direct their invasive planar intercalation in between larval cells. Coordinately, the larval cells extrude from the epithelia by apical constriction of an actomyosin ring and as a consequence die by apoptosis and are removed by circulating haemocytes. We demonstrate that the proliferation of histoblasts and the death of larval cells are triggered by two independent extrinsic Ecdysone hormonal pulses. Finally, we show that histoblast spreading and the death of larval cells depend on a mutual exchange of signals and are non-autonomous processes.
Links	PubMed Online version:10.1242/dev.02728
Keywords	Actins/metabolism; Animals; Animals, Genetically Modified; Cell Communication; Cell Cycle; Cell Death; Cell Proliferation; Drosophila/cytology; Drosophila/genetics; Drosophila/growth & development; Drosophila/metabolism; Drosophila Proteins/metabolism; Ecdysone/metabolism; Epithelial Cells/cytology; Epithelial Cells/metabolism; Genes, Insect; Genotype; Larva/cytology; Larva/growth & development; Metamorphosis, Biological; Myosins/metabolism; Signal Transduction
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