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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Cabeza, Jose M. Acosta, Jorge Alés, Eva |
| Description | Author Affiliation: Cabeza JM ( Departamento de Fisiología Médica y Biofísica, Facultad de Medicina, Universidad de Sevilla, 41009 Sevilla, Spain.) |
| Abstract | In secretory cells, several exocytosis-coupled forms of endocytosis have been proposed including clathrin-mediated endocytosis, kiss-and-run endocytosis, cavicapture, and bulk endocytosis. These forms of endocytosis can be induced under different conditions, but their detailed molecular mechanisms and functions are largely unknown. We studied exocytosis and endocytosis in mast cells with both perforated-patch and whole-cell configurations of the patch clamp technique using cell capacitance measurements in combination with amperometric serotonin detection. We found that intact mast cells exhibit an early endocytosis that follows exocytosis induced by compound 48/80. Direct observation of individual exocytic and endocytic events showed a higher percentage of capacitance flickers (27.3%) and off-steps (11.4%) in intact mast cells than in dialyzed cells (5.4% and 2.9%, respectively). Moreover, we observed a type of endocytosis of large pieces of membrane that were likely formed by cumulative fusion of several secretory granules with the cell membrane. We also identified 'large-capacitance flickers' that occur after large endocytosis events. Pore conductance analysis indicated that these transient events may represent 'compound cavicapture,' most likely due to the flickering of a dilated fusion pore. Using fluorescence imaging of individual exocytic and endocytic events we observed that granules can fuse to granules already fused with the plasma membrane, and then the membranes and dense cores of fused granules are internalized. Altogether, our results suggest that stimulated exocytosis in intact mast cells is followed by several forms of compensatory endocytosis, including kiss-and-run endocytosis and a mechanism for efficient retrieval of the compound membrane of several secretory granules through a single membrane fission event. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 28 |
| Volume Number | 288 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2013-07-12 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cell Membrane Metabolism Endocytosis Exocytosis Mast Cells Physiology Secretory Vesicles Animals Cells, Cultured Fluorescent Dyes Chemistry Guanosine 5'-O-(3-Thiotriphosphate) Pharmacology Drug Effects Membrane Fusion Membrane Potentials Mice Microscopy, Fluorescence Patch-Clamp Techniques Pyridinium Compounds Quaternary Ammonium Compounds Time-Lapse Imaging P-Methoxy-N-methylphenethylamine Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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