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Vol. 11, Issue 8, 2775-2791, August 2000

The Recycling Endosome of Madin-Darby Canine Kidney Cells Is a Mildly Acidic Compartment Rich in Raft Components

Raluca Gagescu,* Nicolas Demaurex,dagger Robert G. Parton,Dagger Walter Hunziker,§|| Lukas A. Huber, and Jean Gruenberg***

 *Department of Biochemistry, University of Geneva, 1211 Geneva 4, Switzerland;  dagger Department of Physiology, Centre Médical Universitaire, 1211 Geneva 4, Switzerland;  Dagger Centre for Microscopy and Microanalysis, Department of Physiology and Pharmacology, and Centre for Molecular and Cellular Biology, University of Queensland, Queensland 4072, Australia;  §Institute of Biochemistry, University of Lausanne, Lausanne, Switzerland; and  Research Institute of Molecular Pathology, Wien, Austria

We present a biochemical and morphological characterization of recycling endosomes containing the transferrin receptor in the epithelial Madin-Darby canine kidney cell line. We find that recycling endosomes are enriched in molecules known to regulate transferrin recycling but lack proteins involved in early endosome membrane dynamics, indicating that recycling endosomes are distinct from conventional early endosomes. We also find that recycling endosomes are less acidic than early endosomes because they lack a functional vacuolar ATPase. Furthermore, we show that recycling endosomes can be reached by apically internalized tracers, confirming that the apical endocytic pathway intersects the transferrin pathway. Strikingly, recycling endosomes are enriched in the raft lipids sphingomyelin and cholesterol as well as in the raft-associated proteins caveolin-1 and flotillin-1. These observations may suggest that a lipid-based sorting mechanism operates along the Madin-Darby canine kidney recycling pathway, contributing to the maintenance of cell polarity. Altogether, our data indicate that recycling endosomes and early endosomes differ functionally and biochemically and thus that different molecular mechanisms regulate protein sorting and membrane traffic at each step of the receptor recycling pathway.


|| Present address: Institute of Molecular and Cell Biology, National University of Singapore, Singapore 117609, Republic of Singapore.

** Corresponding author. E-mail address: jean.gruenberg{at}biochem.unige.ch.


Molecular Biology of the Cell
Vol. 11, 2775-2791, August 2000
Copyright © 2000 by The American Society for Cell Biology



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