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J Biol Chem, Vol. 275, Issue 20, 15207-15219, May 19, 2000
From the The compartments involved in polarized exocytosis
of membrane proteins are not well defined. In this study we
hypothesized that newly synthesized polymeric immunoglobulin receptors
are targeted from the trans-Golgi network to endosomes
prior to their appearance on the basolateral cell surface of polarized
Madin-Darby canine kidney cells. To examine this hypothesis, we have
used an assay designed to measure the meeting of newly synthesized receptors with a selective population of apical or basolateral endosomes loaded with horseradish peroxidase. We found that in the
course of basolateral exocytosis, the wild-type polymeric immunoglobulin receptor is targeted from the trans-Golgi
network to apical and basolateral endosomes. Phosphorylation of a Ser residue in the cytoplasmic tail of the receptor is implicated in this
process. The biosynthetic pathway of apically sorted polymeric immunoglobulin receptor mutants similarly traversed apical endosomes, raising the possibility that apical receptors are segregated from basolateral receptors in apical endosomes. The post-endocytic pathway
of transcytosing and recycling receptors also passed through apical
endosomes. Together, these observations are consistent with the
possibility that the biosynthetic and endocytic routes merge into
endosomes and justify a model suggesting that endosomal recycling
processes govern polarized trafficking of proteins traveling in both pathways.
Interactions between the Exocytic and Endocytic Pathways in
Polarized Madin-Darby Canine Kidney Cells*
,
,
¶
Department of Cell and Animal Biology,
Institute of Life Sciences, Hebrew University of Jerusalem, Jerusalem
91904 and the § Department of Electronics, Jerusalem College
of Technology, Jerusalem 91160, Israel
*
This work was supported by a grant from the Israel Science
Foundation founded by the Israel Academy of Sciences.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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