Scanless two-photon excitation of channelrhodopsin-2.
Scanless two-photon excitation of channelrhodopsin-2.
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DOI:
10.1038/nmeth.1505
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发表时间:
2010-10
期刊:
影响因子:
48
通讯作者:
Emiliani V
中科院分区:
文献类型:
--
作者:
Papagiakoumou E;Anselmi F;Bègue A;de Sars V;Glückstad J;Isacoff EY;Emiliani V
Light-gated ion channels and pumps have made it possible to probe intact neural circuits by manipulating the activity of groups of genetically similar neurons. What is needed now is a method for precisely aiming the stimulating light at single neuronal processes, neurons or groups of neurons. We have developed a method that combines Generalized Phase Contrast (GPC) with temporal focusing (TF) to shape two-photon (2P) excitation for this purpose. The illumination patterns are generated automatically from fluorescent images of neurons and shaped to cover parts of the cell body or dendrite, the entire cell body, or distributed groups of cells. The TF-GPC patterned 2P excitation generates large photo-currents in Channelrhodopsin-2 (ChR2) expressing cultured cells and neurons and in acute cortical slices. The amplitudes of the photo-currents can be precisely modulated by controlling the size and shape of the excitation volume and, thereby, be used to trigger single action potentials (APs) or trains of APs.
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