Regulation of dense core release from neuroendocrine cells revealed by imaging single exocytic events
| Autor: | Amanda J. Cochilla, G. Kilic, Joseph K. Angleson, Itzhak Nussinovitch, William J. Betz |
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| Rok vydání: | 1999 |
| Předmět: |
Male
General Neuroscience Endocytic cycle Cell Biology Cytoplasmic Granules Exocytosis Prolactin Rats Cell biology Rats Sprague-Dawley Prolactin cell medicine.anatomical_structure Membrane Microscopy Fluorescence Biochemistry Pituitary Gland Anterior Cytoplasm Dopamine Computer Graphics medicine Animals Neuroscience Immunostaining medicine.drug |
| Zdroj: | Nature Neuroscience. 2:440-446 |
| ISSN: | 1546-1726 1097-6256 |
| Popis: | Using FM1-43 fluorescence, we have optically detected single exocytic and endocytic events in rat pituitary lactotrophs. About fifty discrete fluorescent spots abruptly appear around the entire surface of a cell bathed in FM1-43 and high-potassium saline. The spots, which also immunostain for prolactin, reflect the labeling of dense cores as well as membranes of exocytosed secretory granules. Stained cores are not released, but remain attached to the cell and are eventually endocytosed. However, in cells exposed to dopamine (or an analog, bromocriptine), the cores dissolve and are secreted after several seconds. Solubilization of dense cores is mediated through a reduction in cytoplasmic cyclic AMP. Thus, the composition of secretions from individual secretory granules is regulated. |
| Databáze: | OpenAIRE |
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