首页> 外文期刊>Neuron >Visualization of synaptic activity in hippocampal slices with FM1-43 enabled by fluorescence quenching.
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Visualization of synaptic activity in hippocampal slices with FM1-43 enabled by fluorescence quenching.

机译:通过荧光猝灭使FM1-43可视化海马切片中的突触活性。

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摘要

Fluorescence imaging of presynaptic uptake and release of styryl dyes such as FM1-43 has provided valuable insights into synaptic function. However, in studies of CNS neurons, the utility of these dyes has been severely limited by nonsynaptic background fluorescence. This has thwarted the use of FM dyes in systems more intact than dissociated neuronal cultures. Here, we describe an approach to selectively reduce undesired fluorescence through quenching of the surface-bound FM1-43 signal. The introduction of sulforhodamine, a fluorophore that is not taken up by synaptic vesicles, selectively reduced the nonsynaptic fluorescence in FM1-43-labeled hippocampal cultures. When applied to rat hippocampal slices, this procedure allowed us to observe activity-dependent staining and destaining of functional synapses. Extending the usefulness of styryl dyes to slice preparations may help make functional synaptic networks amenable to optical measurements.
机译:突触前摄取和释放苯乙烯基染料(例如FM1-43)的荧光成像为突触功能提供了有价值的见解。但是,在CNS神经元的研究中,这些染料的应用受到非突触背景荧光的严重限制。这阻碍了FM染料在比解离的神经元培养物更完整的系统中的使用。在这里,我们描述了一种通过淬灭表面结合的FM1-43信号来选择性减少不需要的荧光的方法。磺基若丹明(一种未被突触小泡吸收的荧光团)的引入选择性地减少了FM1-43标记的海马培养物中的非突触荧光。当应用于大鼠海马切片时,此过程使我们能够观察到活性依赖的染色和功能性突触的脱色。将苯乙烯基染料的用途扩展至切片制品可能有助于使功能性突触网络适合光学测量。

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