Abstract：
:The Arp2/3 complex is important for morphogenesis in various developmental systems, but specific in vivo roles for this complex in cells that move during morphogenesis are not well understood. We have examined cellular roles for Arp2/3 in the Caenorhabditis elegans embryo. In C. elegans, the first morphogenetic movement, gastrulation, is initiated by the internalization of two endodermal precursor cells. These cells undergo a myosin-dependent apical constriction, pulling a ring of six neighboring cells into a gap left behind on the ventral surface of the embryo. In agreement with a previous report, we found that in Arp2/3-depleted C. elegans embryos, membrane blebs form and the endodermal precursor cells fail to fully internalize. We show that these cells are normal with respect to several key requirements for gastrulation: cell cycle timing, cell fate, apicobasal cell polarity and apical accumulation and activation of myosin-II. To further understand the function of Arp2/3 in gastrulation, we examined F-actin dynamics in wild-type embryos. We found that three of the six neighboring cells extend short, dynamic F-actin-rich processes at their apical borders with the internalizing cells. These processes failed to form in embryos that were depleted of Arp2/3 or the apical protein PAR-3. Our results identify an in vivo role for Arp2/3 in the formation of subcellular structures during morphogenesis. The results also suggest a new layer to the model of C. elegans gastrulation: in addition to apical constriction, internalization of the endoderm might involve dynamic Arp2/3-dependent F-actin-rich extensions on one side of a ring of cells.
journal_name
J Cell Scijournal_title
Journal of cell scienceauthors
Roh-Johnson M,Goldstein Bdoi
10.1242/jcs.057562subject
Has Abstractpub_date
2009-11-01 00:00:00pages
3983-93issue
Pt 21eissn
0021-9533issn
1477-9137pii
122/21/3983journal_volume
122pub_type
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pub_type： 杂志文章
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journal_title：Journal of cell science
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更新日期：2013-09-15 00:00:00
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doi：
更新日期：1977-01-01 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1994-05-01 00:00:00
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journal_title：Journal of cell science
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doi：
更新日期：1988-11-01 00:00:00
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doi：
更新日期：1988-10-01 00:00:00
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doi：
更新日期：2001-06-01 00:00:00
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