The small GTPase RhoA is required to maintain spinal cord neuroepithelium organization and the neural stem cell pool
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The small GTPase RhoA is required to maintain spinal cord neuroepithelium organization and the neural stem cell pool. / Herzog, Dominik; Loetscher, Pirmin; van Hengel, Jolanda; Knüsel, Sebastian; Brakebusch, Cord; Taylor, Verdon; Suter, Ueli; Relvas, João B.
I: Journal of Neuroscience, Bind 31, Nr. 13, 30.03.2011, s. 5120-30.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - The small GTPase RhoA is required to maintain spinal cord neuroepithelium organization and the neural stem cell pool
AU - Herzog, Dominik
AU - Loetscher, Pirmin
AU - van Hengel, Jolanda
AU - Knüsel, Sebastian
AU - Brakebusch, Cord
AU - Taylor, Verdon
AU - Suter, Ueli
AU - Relvas, João B
PY - 2011/3/30
Y1 - 2011/3/30
N2 - The regulation of adherens junctions (AJs) is critical for multiple events during CNS development, including the formation and maintenance of the neuroepithelium. We have addressed the role of the small GTPase RhoA in the developing mouse nervous system using tissue-specific conditional gene ablation. We show that, in the spinal cord neuroepithelium, RhoA is essential to localize N-cadherin and ß-catenin to AJs and maintain apical-basal polarity of neural progenitor cells. Ablation of RhoA caused the loss of AJs and severe abnormalities in the organization of cells within the neuroepithelium, including decreased neuroepithelial cell proliferation and premature cell-cycle exit, reduction of the neural stem cell pool size, and the infiltration of neuroepithelial cells into the lumen of the ventricle. We also show that, in the absence of RhoA, its effector, mammalian diaphanous-related formin1 (mDia1), does not localize to apical AJs in which it likely stabilizes intracellular adhesion by promoting local actin polymerization and microtubule organization. Furthermore, expressing a dominant-negative form of mDia1 in neural stem/progenitor cells results in a similar phenotype compared with that of the RhoA conditional knock-out, namely the loss of AJs and apical polarity. Together, our data show that RhoA signaling is necessary for AJ regulation and for the maintenance of mammalian neuroepithelium organization preventing precocious cell-cycle exit and differentiation.
AB - The regulation of adherens junctions (AJs) is critical for multiple events during CNS development, including the formation and maintenance of the neuroepithelium. We have addressed the role of the small GTPase RhoA in the developing mouse nervous system using tissue-specific conditional gene ablation. We show that, in the spinal cord neuroepithelium, RhoA is essential to localize N-cadherin and ß-catenin to AJs and maintain apical-basal polarity of neural progenitor cells. Ablation of RhoA caused the loss of AJs and severe abnormalities in the organization of cells within the neuroepithelium, including decreased neuroepithelial cell proliferation and premature cell-cycle exit, reduction of the neural stem cell pool size, and the infiltration of neuroepithelial cells into the lumen of the ventricle. We also show that, in the absence of RhoA, its effector, mammalian diaphanous-related formin1 (mDia1), does not localize to apical AJs in which it likely stabilizes intracellular adhesion by promoting local actin polymerization and microtubule organization. Furthermore, expressing a dominant-negative form of mDia1 in neural stem/progenitor cells results in a similar phenotype compared with that of the RhoA conditional knock-out, namely the loss of AJs and apical polarity. Together, our data show that RhoA signaling is necessary for AJ regulation and for the maintenance of mammalian neuroepithelium organization preventing precocious cell-cycle exit and differentiation.
KW - Animals
KW - Cell Cycle
KW - Cell Differentiation
KW - Female
KW - Intercellular Junctions
KW - Mice
KW - Mice, Inbred C57BL
KW - Mice, Transgenic
KW - Monomeric GTP-Binding Proteins
KW - Neural Stem Cells
KW - Neuroepithelial Cells
KW - Neurogenesis
KW - Pregnancy
KW - Signal Transduction
KW - Spinal Cord
KW - rhoA GTP-Binding Protein
U2 - 10.1523/JNEUROSCI.4807-10.2011
DO - 10.1523/JNEUROSCI.4807-10.2011
M3 - Journal article
C2 - 21451048
VL - 31
SP - 5120
EP - 5130
JO - The Journal of neuroscience : the official journal of the Society for Neuroscience
JF - The Journal of neuroscience : the official journal of the Society for Neuroscience
SN - 0270-6474
IS - 13
ER -
ID: 33901636