Abstract
Understanding the mechanism of synaptic transmission and its plasticity is one of the central goals of modern neuroscience. Neuronal culture is a very convenient model for studying mechanisms of synaptic transmission. However, investigation of two or more synaptically connected neurons in culture by conventional methods is a difficult task. In this study, we describe new protocol for studying the synaptic transmission between cultured neurons using in suspension electroporation for the expression of channelrhodopsin-2 (ChR2) which was applied to only certain subpopulation of cultured cells, leaving the majority of neurons completely untreated. We show that this technique allows reliable long-lasting (hours) recording of monosynaptic excitatory postsynaptic potentials (EPSPs) in cultured hippocampal neurons using a repeated light stimulation of neighboring ChR2-expressing neurons.
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