Abstract
Abstract The nervous system has evolved to make use of a variety of mechanisms that allow information to flow and be processed among a large collection of individual cells. The communication between individual brain cells occurs largely at chemical synapses. In these compartments, chemical messengers are packaged into small vesicles that fuse with the cell membrane upon stimulation, releasing neurotransmitter.. The average total number of synaptic vesicles in a typical central nervous system synapse is only a few hundred and as a result an efficient local recycling mechanism operates in order to replenish this pool during periods of even modest neuronal activity. Without this membrane recycling, synapses quickly become depleted of vesicles, and soon fail to communicate information between cells. We make use of optical techniques to follow the trafficking of synaptic vesicles at synapses formed between hippocampal neurons grown in culture. Recycling synaptic vesicles can be readily labeled using the fluorescent amphipathic membrane dye FM 1-43.
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