期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 105, 期 1, 页码 335-340出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0705713105
关键词
kinase; signaling; neurodevelopment
资金
- NCI NIH HHS [CA82683, R01 CA082683] Funding Source: Medline
In the neurogenic phase of CNS development, the proliferating progenitors are found medially within the neuroepithelium. The adherens junctions on the apical membrane of proliferating neural progenitors allow for cell-cell adhesion and medial stratification. In contrast, differentiating neuronal precursors delaminate and migrate laterally, establishing the laminar layers. Apical adherens junctions also establish the apical-basal polarity in neural progenitors, which in turn is postulated to lead to asymmetric inheritance of cell fate determinants during neurogenic divisions. The signaling pathways and cellular mechanisms that regulate the assembly and asymmetric localization of adherens junctions in neural progenitors remain elusive. Here we show that atypical PKC zeta/lambda(aPKC zeta/lambda ) localizes at the apical membrane of proliferating neural stem cells, but not postmitotic neuronal precursors, in the developing chicken neural tube. This precise subcellular compartmentalization of the kinase activity provides an instructive signal for apical assembly of adherens junctions in a PI3K, Rac/Cdc42 signaling-dependent pathway. Apical aPKC zeta coordinates neural stem cell proliferation and the overall stratification of cell types within the neural tube.
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