利用膜片钳技术标记脑片神经元的方法

A method of marking neurons on brain slices using patch clamp technique

目的:介绍一种利用膜片钳技术标记脑片神经元形态的方法。方法:利用振动切片机切好实验目标部位的脑片,用含有Neurobiotin TM Tracer的电极内液灌注玻璃微电极,并进行全细胞膜片钳记录;实验结束后将脑片先用4%多聚甲醛固定、漂洗,再用含有Streptavidin-Texas Red和Triton X-100的PB染色,2 h后即可用荧光显微镜观察着色的神经元。结果:将细胞膜电压钳制在-70 mV,阶跃刺激后神经元表现为逐渐增大的膜电流。电流钳模式记录时,阶跃刺激使神经元去极化,达到阈电位后爆发动作电位。荧光显微镜下可看到胞体和主要突起清晰完整的神经元形态。结论:本方法适用于在膜片钳实验后观察所记录的神经元的形态特征,操作方便,图像直观清晰。

Objective:To introduce a method of marking neurons using patch clamp technique.Methods:The brain slices of the target area was cut with a vibrating microtome.The glass microelectrode was perfused with the electrode liquid containing Neurobiotin TM Tracer,and the whole-cell patch-clamp recording was performed.After recording,the brain slices were fixed and rinsed with 4%paraformaldehyde.After stained in phosphate buffer with Streptavidin-Texas Red and Triton X-100 for at least 2 hours,the neurons can be observed under a fluorescence microscope.Results:The cell membrane voltage was clamped at-70 mV,and the neuron showed a gradually increasing membrane current after step stimulation.When recording in the current clamp mode,the step stimulus caused the neuron to depolarize to the threshold potential and then burst into action potentials.The morphology of intact neurons with clear cell body and protrusions of a neuron could be observed under a fluorescence microscope.Conclusion:This method is suitable for observing the morphological features of the recorded neuron after patch clamp experiments,which is easy to operate,and the image is intuitive and clear.