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Journal Article
Research Support, Non-U.S. Gov't
Purification and Analysis of Exosomes Released by Mature Cortical Neurons Following Synaptic Activation.
Exosomes are vesicles released by most cells into their environment upon fusion of multivesicular endosomes with the plasma membrane. Exosomes are vesicles of 60-100 nm in diameter, floating in sucrose at a density of ~1.15 g/mL and carrying a number of marker proteins such as Alix, Tsg101, and Flotillin-1. We use dissociated cortical neurons cultured for around two weeks as exosome-releasing cells. In these conditions, neurons make mature synapses and form networks that can be activated by physiological stimuli. Here, we describe methods to culture differentiated cortical neurons, induce exosome release by increasing glutamatergic synapse activity, and purify exosomes by differential centrifugations followed by density separation using sucrose gradients. These protocols allow purification of neuronal exosomes released within minutes of activation of glutamatergic synapses.
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