Journal of Neurocytology

, Volume 25, Issue 1, pp 289–301

Cytoskeletal changes during neurogenesis in cultures of avian neural crest cells

  • Melissa A. Haendel
  • Kathryn E. Bollinger
  • Peter W. Baas
Article

Summary

Neural crest cells are motile and mitotic, whereas their neuronal derivatives are terminally post-mitotic and consist of stationary cell body from which processes grow. The present study documents changes in the cytoskeleton that occur during neurogenesis in cultures of avian neural crest cells. The undifferentiated neural crest cells contain dense bundles of actin filaments throughout their cytoplasm, and a splayed array of microtubules attached to the centrosome. In newly differentiating neurons, the actin bundles are disrupted and most of the remaining actin filaments are reorganized into a cortical layer underlying the plasma membrane of the cell body and processes. Microtubules are more abundant in newly-differentiating neurons than in the undifferentiated cells, and individual microtubules can be seen dissociated from the centrosome. Neuron-specific β-III tubulin appears in some crest cells prior to cessation of motility and cell division, and expression increases with total microtubule levels during neurogenesis. To investigate how these early cytoskeletal changes might contribute to alterations in morphology during neurogenesis, we have disrupted the cytoskeleton with pharmacologic agents. Microfilament disruption by cytochalasin immediately arrests the movement of neural crest cells and causes them to round-up, but does not significantly change the morphology of the immature neurons. Microtubule depolymerization by nocodazole slows the movement of undifferentiated cells and causes retraction of processes extended by the immature neurons. These results suggest that changes in the actin and microtubule arrays within neural crest cells govern distinct aspects of their morphogenesis into neurons.

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Copyright information

© Chapman and Hall 1996

Authors and Affiliations

  • Melissa A. Haendel
    • 1
  • Kathryn E. Bollinger
    • 1
  • Peter W. Baas
    • 1
  1. 1.Department of Anatomy and Program in NeuroscienceThe University of Wisconsin Medical SchoolMadisonUSA

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