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Vol. 12, Issue 4, 1103-1116, April 2001
Departments of *Physiology and The organization of the endoplasmic reticulum (ER) in the cortex of
Xenopus oocytes was investigated during maturation and activation using a green fluorescent protein chimera,
immunofluorescence, and electron microscopy. Dense clusters of ER
developed on the vegetal side (the side opposite the meiotic spindle)
during maturation. Small clusters appeared transiently at the time of
nuclear envelope breakdown, disappeared at the time of first polar body
formation, and then reappeared as larger clusters in mature eggs. The
appearance of the large ER clusters was correlated with an increase in
releaseability of Ca2+ by IP3. The clusters
dispersed during the Ca2+ wave at activation. Possible
relationships of ER structure and Ca2+ regulation are discussed.
Pediatric Dentistry,
University of Connecticut Health Center, Farmington, Connecticut 06032
Online version of this article contains video
material for Figures 9 and 10. Online version available at
www.molbiocell.org.
Corresponding author. E-mail address:
terasaki{at}neuron.uchc.edu.
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