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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Valentijn, K. Valentijn, J. A. Jamieson, J. D. Pastore, L. M. |
| Description | Author Affiliation: Valentijn JA ( Yale University School of Medicine, Department of Cell Biology, 333 Cedar Street, New Haven, CT, 06520, USA.); |
| Abstract | The present study describes a novel phenomenon in pancreatic acinar cells undergoing regulated exocytosis. When acinar cell preparations were challenged with the secretagogue carbamylcholine, a subpopulation of zymogen granules became coated with filamentous actin. These zymogen granules were always in proximity of the acinar cell apical membrane (the site of exocytosis) but did not appear to have fused yet. They were distinct from regular zymogen granules not only because of their association with filamentous actin, but also because the majority of them lacked the zymogen granule marker rab3D, a small GTPase implicated in regulated exocytosis. The apparent loss of rab3D, presumed to result from the release of rab3D from the granule membranes, could be prevented by agents that modulate the actomyosin system as well as by GTP[gammaS]. These data suggest that zymogen granules engaging in exocytosis become coated with actin before fusion and that this actin coating is tightly coupled to the release of rab3D. We propose that rab3D is involved in the regulation of actin polymerization around secretory granules and that actin coating might facilitate the movement of granules across the subapical actin network and toward their fusion site. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 3 |
| Volume Number | 97 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2000-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Actin Cytoskeleton Physiology Actins Metabolism Amylases Secretion Carbachol Pharmacology Cytoplasmic Granules Exocytosis Drug Effects Pancreas Rab3 GTP-Binding Proteins Animals Biological Transport Biological Markers Cell Polarity Intracellular Membranes Rats, Sprague-Dawley Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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