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Vol. 11, Issue 3, 1093-1101, March 2000

Polarized Sphingolipid Transport from the Subapical Compartment Changes during Cell Polarity Development

Sven C.D. van IJzendoorn,* and Dick Hoekstradagger

Department of Physiological Chemistry, University of Groningen, Groningen, the Netherlands

The subapical compartment (SAC) plays an important role in the polarized transport of proteins and lipids. In hepatoma-derived HepG2 cells, fluorescent analogues of sphingomyelin and glucosylceramide are sorted in the SAC. Here, evidence is provided that shows that polarity development is regulated by a transient activation of endogenous protein kinase A and involves a transient activation of a specific membrane transport pathway, marked by the trafficking of the labeled sphingomyelin, from the SAC to the apical membrane. This protein kinase A-regulated pathway differs from the apical recycling pathway, which also traverses SAC. After reaching optimal polarity, the direction of the apically activated pathway switches to one in the basolateral direction, without affecting the apical recycling pathway.

* Present address: Department of Anatomy, 513 Parnasssus Avenue, Box 0452, University of California School of Medicine, San Francisco, CA 94143-0452.

dagger Corresponding author. E-mail address: d.hoekstra{at}med.rug.nl.

Molecular Biology of the Cell
Vol. 11, 1093-1101, March 2000
Copyright © 2000 by The American Society for Cell Biology


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