比较合成脂质双层与含有TRP通道的细胞膜的离子电导记录
Comparing ion conductance recordings of synthetic lipid bilayers with cell membranes containing TRP channels
摘要：
在这篇文章中，我们比较电导事件从单通道记录的三个TRP通道蛋白（TRPA 1，TRPM 2和TRPM 8）在人胚肾细胞中表达的合成脂质膜上记录的通道事件接近熔化过渡。来自TRP家族的离子通道参与各种感觉过程，包括热和机械接收。接近相变的合成脂质膜显示通道样事件，其响应于与诸如压力和温度的密集热力学变量的变化相关的刺激。TRP通道活性的特征在于依赖于表达的蛋白质类型的电流事件的典型模式。合成的脂质双层显示了广泛的电现象，被认为是典型的蛋白质离子通道的活性。我们发现单一的电流，突发行为，闪烁，多步电导，和尖峰行为在这两个准备。此外，我们报告的电导和寿命的脂质通道所描述的蛋白质通道。在这两个系统中看到的非线性和不对称的电流-电压关系。在没有进一步了解记录条件的情况下，很难判断短电流迹线是来自通道蛋白还是来自纯脂质膜
英文摘要：
In this article we compare electrical conductance events from single channel recordings of three TRP channel proteins (TRPA1, TRPM2 and TRPM8) expressed in human embryonic kidney cells with channel events recorded on synthetic lipid membranes close to melting transitions. Ion channels from the TRP family are involved in a variety of sensory processes including thermo- and mechano-reception. Synthetic lipid membranes close to phase transitions display channel-like events that respond to stimuli related to changes in intensive thermodynamic variables such as pressure and temperature. TRP channel activity is characterized by typical patterns of current events dependent on the type of protein expressed. Synthetic lipid bilayers show a wide spectrum of electrical phenomena that are considered typical for the activity of protein ion channels. We find unitary currents, burst behavior, flickering, multistep-conductances, and spikes behavior in both preparations. Moreover, we report conductances and lifetimes for lipid channels as described for protein channels. Non-linear and asymmetric current-voltage relationships are seen in both systems. Without further knowledge of the recording conditions, no easy decision can be made whether short current traces originate from a channel protein or from a pure lipid membrane
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