Microvilli appear to represent the first step in actin bundle formation in Drosophila bristles

Journal of Cell Science
L G TilneyG M Guild

Abstract

During bristle development the emerging bristle shaft, socket cell, and the apical surface of thoracic epithelial cells form tiny protuberances or pimples that contain electron-dense material located on the cytoplasmic surface of the pimple tip. In a few cases short actin filaments extend from this material into the cortical cytoplasm. When cultured in the presence of jasplakinolide, an agent that prevents filament disassembly, pimples elongate to form microvilli containing a core of crosslinked filaments. Emerging-bristle mutants delay cortical bundle formation and are aggregated by forked protein crossbridges. Using these mutants and enhancing core bundle formation with jasplakinolide we found that microvillar formation represents the first stage in the morphogenesis of much larger actin bundles in Drosophila bristle shaft cells. Evidence is presented showing that socket cells do not contain forked protein crossbridges, a fact that may explain why cortical bundles only appear in bristle shaft cells. Furthermore, as pimples and microvilli form in the absence of both forked and fascin crossbridges, we also conclude that neither of these crossbridges account for core bundle formation in microvilli, but there must exist a third, ...Continue Reading

References

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Jan 1, 1992·Current Topics in Developmental Biology·S N MamajiwallaD R Burgess
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Feb 5, 2003·The Journal of Cell Biology·Tatyana M SvitkinaGary G Borisy
Sep 17, 2003·The Journal of Cell Biology·Gregory M GuildLewis G Tilney

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Citations

Sep 17, 2004·Molecular Biology of the Cell·Lewis G TilneyDavid Derosier
May 4, 2007·Molecular Biology of the Cell·Derek A ApplewhiteGary G Borisy
Jun 19, 2013·Molecular Biology and Evolution·Arnau Sebé-PedrósIñaki Ruiz-Trillo
Aug 4, 2006·Journal of Neurophysiology·Babak A KachoeiNeil S Magoski
Dec 17, 2005·Proceedings of the National Academy of Sciences of the United States of America·Lewis G Tilney, David J DeRosier
Aug 21, 2013·Insect Science·Bernard Moussian
Sep 2, 2016·The Journal of Biological Chemistry·Manmeet H RavalChristopher M Yengo
Jan 31, 2021·Cell Research·Yi-Jun LiuShumin Duan

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