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The Journal of Neuroscience, September 1, 1998, 18(17):6803-6813
Calcium-Evoked Dendritic Exocytosis in Cultured Hippocampal Neurons. Part I: Trans-Golgi Network-Derived Organelles Undergo Regulated Exocytosis
Mirjana Maletic-Savatic and Roberto Malinow Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724
Exocytosis is a widely observed cellular mechanism for delivering transmembrane proteins to the cell surface and releasing signaling molecules into the extracellular space. Calcium-evoked exocytosis, traditionally thought to be restricted to presynaptic specializations in neurons, has been described recently in many cells. Here, calcium-evoked dendritic exocytosis (CEDE) is visualized in living cultured hippocampal neurons. Organelles that undergo CEDE are in somata, dendrites, and perisynaptic regions, identified by using immunocytochemistry and correlative light and electron microscopy. CEDE is regulated developmentally: neurons <9 d in vitro do not show CEDE. In addition, CEDE is blocked by tetanus toxin, an inhibitor of regulated exocytosis, and nocodazole, an inhibitor of microtubule polymerization. Organelles that undergo CEDE often are found on the base of spines, putative sites of synaptic plasticity. CEDE therefore could be involved in structural and functional modification of spines and could play a role in synaptic plasticity, where it might involve changes in receptor/channel density, release of active compounds having effect on pre- and postsynaptic function, and/or growth of synaptic structures.
Key words: exocytosis; trans-Golgi network; dendrite; pyramidal neurons; hippocampal culture; time-lapse imaging; FM1-43; immunocytochemistry; tetanus toxin; microtubules
Copyright © 1998 Society for Neuroscience 0270-6474/98/18176803-11$05.00/0
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