Postfertilization growth of microvilli in the sea urchin egg: New views from eggs that have been quick-frozen, freeze-fractured, and deeply etched

  • Chandler D
  • Heuser J
  • 5

    Readers

    Mendeley users who have this article in their library.
  • 39

    Citations

    Citations of this article.

Abstract

We have used quick-freezing, freeze-fracture, and deep etching to study postfertilization growth of microvilli in the sea urchin, Strongylocentrotus purpuratus. Between 1 and 2 min postinsemination, we observed rapid growth of numerous finger-like microvilli to about 0.7 μm in length. Subsequently, groups of two to four microvilli became raised off the egg surface on broad cytoplasmic bases. Finally, by 5 min postinsemination, these bases had become interconnected by thin sheets of cytoplasm to form a continuous network of ruffles across the egg surface. Corresponding thin sections of quick-frozen and freeze-substituted eggs showed that these microvilli contained networks of microfilaments. The finger-like processes had bundles of parallel microfilaments that ran their entire length, while the ruffles of cytoplasm contained sheets of crisscrossed microfilaments. These observations support the hypothesis that microvillar growth results from formation of new microfilament networks. © 1981.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • Douglas E. Chandler

  • John Heuser

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free