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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Daro, E. A. Sheff, D. R. Mellman, I. Hull, M. |
| Description | Author Affiliation: Sheff DR ( Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut 06520-8002, USA.) |
| Abstract | Receptor recycling involves two endosome populations, peripheral early endosomes and perinuclear recycling endosomes. In polarized epithelial cells, either or both populations must be able to sort apical from basolateral proteins, returning each to its appropriate plasma membrane domain. However, neither the roles of early versus recycling endosomes in polarity nor their relationship to each other has been quantitatively evaluated. Using a combined morphological, biochemical, and kinetic approach, we found these two endosome populations to represent physically and functionally distinct compartments. Early and recycling endosomes were resolved on Optiprep gradients and shown to be differentially associated with rab4, rab11, and transferrin receptor; rab4 was enriched on early endosomes and at least partially depleted from recycling endosomes, with the opposite being true for rab11 and transferrin receptor. The two populations were also pharmacologically distinct, with $AlF_{4}$ selectively blocking export of transferrin receptor from recycling endosomes to the basolateral plasma membrane. We applied these observations to a detailed kinetic analysis of transferrin and dimeric IgA recycling and transcytosis. The data from these experiments permitted the construction of a testable, mathematical model which enabled a dissection of the roles of early and recycling endosomes in polarized receptor transport. Contrary to expectations, the majority (>65%) of recycling to the basolateral surface is likely to occur from early endosomes, but with relatively little sorting of apical from basolateral proteins. Instead, more complete segregation of basolateral receptors from receptors intended for transcytosis occurred upon delivery to recycling endosomes. |
| ISSN | 00219525 |
| e-ISSN | 15408140 |
| Journal | The Journal of Cell Biology |
| Issue Number | 1 |
| Volume Number | 145 |
| Language | English |
| Publisher | Rockefeller University Press (United States) |
| Publisher Date | 1999-04-05 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Endocytosis Physiology Endosomes Receptors, Cell Surface Metabolism Rab GTP-Binding Proteins Aluminum Compounds Pharmacology Animals Cell Line Cell Polarity Centrifugation, Density Gradient Classification Epithelial Cells Cytology Fluorides GTP-Binding Proteins Immunoglobulin A Kidney Kinetics Models, Biological Receptors, Polymeric Immunoglobulin Receptors, Transferrin Rab4 GTP-Binding Proteins Cell Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Medicine |
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