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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ellinger, A. Mellman, I. Klapper, H. Fuchs, R. Pavelka, M. |
| Description | Author Affiliation: Fuchs R ( Department of General and Experimental Pathology, University of Vienna, Austria.); |
| Abstract | Coated vesicle fractions from a variety of tissues have been found to contain a vacuolar proton ATPase. Since these fractions contain both plasma membrane- and Golgi-derived coated vesicles, we sought to determine specifically whether endocytic coated vesicles from rat liver contain an active vacuolar proton ATPase. Endocytic vesicles (coated vesicles and endosomes) were selectively labeled with pH-sensitive endocytic tracers (fluorescein isothiocyanate-dextran or -asialoorsomucoid). Coated vesicles were then separated from endosomes by sucrose density gradient centrifugation. Although the endosomal fractions were found to exhibit significant ATP-dependent acidification activity, highly purified coated vesicles containing pH-sensitive endocytic tracers were unable to generate a pH gradient in response to ATP addition. The coated vesicles could be passively acidified, however, by creating potassium diffusion potentials, indicating that they were in fact capable of maintaining proton gradients. Moreover, significant ATP-dependent acidification activity was observed when the coated vesicle fractions were assayed using the nonselective externally added pH probe acridine orange. Thus, it appears that rat liver endocytic coated vesicles do not contain a functional proton pump. The active vacuolar proton ATPase found in these fractions instead reflected the presence of Golgi-derived coated vesicles or contaminating membranes. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 11 |
| Volume Number | 91 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1994-06-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Coated Pits, Cell-Membrane Metabolism Endocytosis Liver Adenosine Triphosphate Animals Hydrogen-Ion Concentration Ultrastructure Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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