Dcdc42 acts in TGF-beta signaling during Drosophila morphogenesis: distinct roles for the Drac1/JNK and Dcdc42/TGF-beta cascades in cytoskeletal regulation
| Autor: | Louis Lim, Michael Ricos, William Chia, Nicholas Harden, Kai Ping Sem |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Receptors
Cell Surface Protein Serine-Threonine Kinases Biology GTP-Binding Proteins Transforming Growth Factor beta TGF beta signaling pathway Morphogenesis Animals Drosophila Proteins Transgenes Cytoskeleton Microscopy Confocal Models Genetic Epidermis (botany) Decapentaplegic JNK Mitogen-Activated Protein Kinases Drosophila embryogenesis Cell Biology Transforming growth factor beta Immunohistochemistry Dorsal closure rac GTP-Binding Proteins Cell biology Rac GTP-Binding Proteins Drosophila melanogaster Microscopy Fluorescence Calcium-Calmodulin-Dependent Protein Kinases biology.protein Epidermis Mitogen-Activated Protein Kinases Signal transduction Signal Transduction |
| Zdroj: | Journal of Cell Science. 112:1225-1235 |
| ISSN: | 1477-9137 0021-9533 |
| Popis: | During Drosophila embryogenesis the two halves of the lateral epidermis migrate dorsally over a surface of flattened cells, the amnioserosa, and meet at the dorsal midline in order to form the continuous sheet of the larval epidermis. During this process of epithelial migration, known as dorsal closure, signaling from a Jun-amino-terminal-kinase cascade causes the production of the secreted transforming-growth-factor-beta-like ligand, Decapentaplegic. Binding of Decapentaplegic to the putative transforming-growth-factor-beta-like receptors Thickveins and Punt activates a transforming-growth-factor-beta-like pathway that is also required for dorsal closure. Mutations in genes involved in either the Jun-amino-terminal-kinase cascade or the transforming-growth-factor-beta-like signaling pathway can disrupt dorsal closure. Our findings show that although these pathways are linked they are not equivalent in function. Signaling by the Jun-amino-terminal-kinase cascade may be initiated by the small Ras-like GTPase Drac1 and acts to assemble the cytoskeleton and specify the identity of the first row of cells of the epidermis prior to the onset of dorsal closure. Signaling in the transforming-growth-factor-beta-like pathway is mediated by Dcdc42, and acts during the closure process to control the mechanics of the migration process, most likely via its putative effector kinase DPAK. |
| Databáze: | OpenAIRE |
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