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Rab3D is not required for exocrine exocytosis but for maintenance of normally sized secretory granules
Authors:Riedel Dietmar  Antonin Wolfram  Fernandez-Chacon Rafael  Alvarez de Toledo Guillermo  Jo Tobias  Geppert Martin  Valentijn Jack A  Valentijn Karin  Jamieson James D  Südhof Thomas C  Jahn Reinhard
Institution:Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, 37077 G?ttingen, Germany.
Abstract:Rab3D, a member of the Rab3 subfamily of the Rab/ypt GTPases, is expressed on zymogen granules in the pancreas as well as on secretory vesicles in mast cells and in the parotid gland. To shed light on the function of Rab3D, we have generated Rab3D-deficient mice. These mice are viable and have no obvious phenotypic changes. Secretion of mast cells is normal as revealed by capacitance patch clamping. Furthermore, enzyme content and overall morphology are unchanged in pancreatic and parotid acinar cells of knockout mice. Both the exocrine pancreas and the parotid gland show normal release kinetics in response to secretagogue stimulation, suggesting that Rab3D is not involved in exocytosis. However, the size of secretory granules in both the exocrine pancreas and the parotid gland is significantly increased, with the volume being doubled. We conclude that Rab3D exerts its function during granule maturation, possibly by preventing homotypic fusion of secretory granules.
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