Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 102, Issue 38, Pages 13652-13657Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0506008102
Keywords
actin; microtubules; myosin II; blebbistatin; motility
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Funding
- NIMH NIH HHS [R37 MH051864, R01 MH051864] Funding Source: Medline
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Discoveries from human and mouse genetics have identified cytoskeletal and signaling proteins that are essential for neuronal migration in the developing brain. To provide a meaningful context for these studies, we took an unbiased approach of correlative electron microscopy of neurons migrating through a three-dimensional matrix, and characterized the cytoskeletal events that occur as migrating neurons initiate saltatory forward movements of the cell nucleus. The formation of a cytoplasmic dilation in the proximal leading process precedes nuclear translocation. Cell nuclei translocate into these dilations in saltatory movements. Time-lapse imaging and pharmacological perturbation suggest that nucleokinesis requires stepwise or hierarchical interactions between microtubules, myosin II, and cell adhesion. We hypothesize that these interactions couple leading process extension to nuclear translocation during neuronal migration.
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