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(Received for publication, August 16, 1996, and in revised form, December 18, 1996)
From the Laboratory of Epithelial Cell Biology, Renal/Electrolyte
Division of the Department of Medicine, and Department of Cell
Biology and Physiology, University of Pittsburgh,
Pittsburgh, Pennsylvania 15213
It has been postulated that membrane traffic in
polarized epithelial cells requires both actin filaments and
microtubules. We have tested this hypothesis by analyzing the effect of
cytochalasin D (cytoD; an actin-disrupting agent), by itself or in
combination with nocodazole (a microtubule depolymerizing agent), on
postendocytic traffic in Madin-Darby canine kidney cells. CytoD
treatment inhibited basolateral to apical transcytosis of IgA in
polymeric immunoglobulin receptor-expressing cells by approximately
45%, but had little effect on basolateral recycling of transferrin.
Apical recycling of IgA was also inhibited by approximately 20%. Like
nocodazole, cytoD acted at an early step in transcytosis, and inhibited
translocation of IgA between the basolateral early endosomes and the
apical recycling endosome. There was little inhibition of the
subsequent release of IgA from the apical recycling endosome of cytoD-
or nocodazole-treated cells. Order-of-addition experiments suggest that
the cytoD-sensitive step preceded the nocodazole-sensitive step.
Treatment with both cytoD and nocodazole inhibited transcytosis 95%.
These results suggest that in addition to microtubules, efficient postendocytic traffic in polarized epithelial cells also requires actin
filaments.
Volume 272, Number 10,
Issue of March 7, 1997
pp. 6741-6751
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
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