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Cdc42 and Par proteins stabilize dynamic adherens junctions in the Drosophila neuroectoderm through regulation of apical endocytosis

Journal Article · · Journal of Cell Biology
 [1];  [2]
  1. Univ. of Toronto, ON (Canada). Dept. of Cell and Systems Biology; DOE/OSTI
  2. Univ. of Toronto, ON (Canada). Dept. of Cell and Systems Biology
Cell rearrangements require dynamic changes in cell–cell contacts to maintain tissue integrity. We investigated the function of Cdc42 in maintaining adherens junctions (AJs) and apical polarity in the Drosophila melanogaster neuroectodermal epithelium. About one third of cells exit the epithelium through ingression and become neuroblasts. Cdc42-compromised embryos lost AJs in the neuroectoderm during neuroblast ingression. In contrast, when neuroblast formation was suppressed, AJs were maintained despite the loss of Cdc42 function. Loss of Cdc42 function caused an increase in the endocytotic uptake of apical proteins, including apical polarity factors such as Crumbs, which are required for AJ stability. In addition, Cdc42 has a second function in regulating endocytotic trafficking, as it is required for the progression of apical cargo from the early to the late endosome. The Par complex acts as an effector for Cdc42 in controlling the endocytosis of apical proteins. This study reveals functional interactions between apical polarity proteins and endocytosis that are critical for stabilizing dynamic basolateral AJs.
Research Organization:
Univ. of Toronto, ON (Canada)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
OSTI ID:
1625152
Journal Information:
Journal of Cell Biology, Journal Name: Journal of Cell Biology Journal Issue: 6 Vol. 183; ISSN 0021-9525
Publisher:
Rockefeller University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (44)

The Cdc42 GEF Intersectin 2 controls mitotic spindle orientation to form the lumen during epithelial morphogenesis journal May 2010
Apical polarity proteins recruit the RhoGEF Cysts to promote junctional myosin assembly journal August 2019
The multifarious regulation of the apical junctional complex journal February 2020
Somatic support cells regulate germ cell survival through the Baz/aPKC/Par6 complex journal January 2019
Segmentation and Tracking of Adherens Junctions in 3D for the Analysis of Epithelial Tissue Morphogenesis journal April 2015
p120 Catenin-Mediated Stabilization of E-Cadherin Is Essential for Primitive Endoderm Specification journal August 2016
Epithelial-to-Mesenchymal Plasticity Harnesses Endocytic Circuitries journal February 2015
Conserved and Plant-Unique Mechanisms Regulating Plant Post-Golgi Traffic journal January 2012
Doing cell biology in embryos: regulated membrane traffic and its implications for cadherin biology journal April 2010
The interdependence of the Rho GTPases and apicobasal cell polarity journal April 2014
The tumor suppressor PTEN and the PDK1 kinase regulate formation of the columnar neural epithelium journal January 2016
aaquetzalliis required for epithelial cell polarity and neural tissue formation inDrosophila journal June 2018
Polarity Protein Complex Scribble/Lgl/Dlg And Epithelial Cell Barriers book January 2013
Adherens Junction and E-Cadherin complex regulation by epithelial polarity journal May 2016
Spatial regulation of Dia and Myosin-II by RhoGEF2 controls initiation of E-cadherin endocytosis during epithelial morphogenesis journal April 2011
Regulation of epithelial polarity by the E3 ubiquitin ligase Neuralized and the Bearded inhibitors in Drosophila journal April 2012
The tumour suppressor DLC2 ensures mitotic fidelity by coordinating spindle positioning and cell–cell adhesion journal December 2014
Pathways and mechanisms of endocytic recycling journal September 2009
Adherens junctions: from molecules to morphogenesis journal July 2010
Sticking together the Crumbs — an unexpected function for an old friend journal April 2013
Organization and execution of the epithelial polarity programme journal March 2014
The Hippo pathway and apico–basal cell polarity journal May 2011
The Scribble–Dlg–Lgl polarity module in development and cancer: from flies to man journal August 2012
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