Distribution of M-channel subunits KCNQ2 and KCNQ3 in rat hippocampus.

Distribution of M-channel subunits KCNQ2 and KCNQ3 in rat hippocampus.
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大鼠海马中M通道亚基KCNQ2和KCNQ3的分布。

DOI:
10.1016/j.neuroimage.2011.07.003
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发表时间:
2011-10-01
期刊:
影响因子:
5.7
通讯作者:
Shapiro, Mark S.
Shapiro, Mark S.
中科院分区:
医学1区
文献类型:
--
作者:
Klinger, Felicia;Gould, Georgianna;Boehm, Stefan;Shapiro, Mark S.

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神经元的m通道是低阈值、缓慢激活和非灭活的、电压依赖性的K+通道,在控制神经元兴奋性中起着至关重要的作用。天然m通道由属于Kv7/KCNQ家族的亚基的异质或同源组合组成,其中KCNQ2/3异质异构体是最丰富的形式。KCNQ2和KCNQ3亚基已被发现在啮齿动物和人类中枢和外周神经系统的多种神经元中表达。先前的证据表明,这两个亚单位优先定位于轴突初始段、躯体和Ranvier节点。在这项工作中,我们通过对未固定的大鼠脑切片和共聚焦显微镜的免疫染色实验,展示了KCNQ2和KCNQ3亚基在整个海马结构中的分布和共定位。我们在海马的几个区域发现了轴突初始段的强烈定位和共定位,以及侧脑室区域的非神经元细胞的染色。我们没有观察到KCNQ2或KCNQ3与突触前蛋白synaptophysin共定位。
Neuronal M-channels are low threshold, slowly activating and non-inactivating, voltage dependent K+ channels that play a crucial role in controlling neuronal excitability. The native M-channel is composed of heteromeric or homomeric assemblies of subunits belonging to the Kv7/KCNQ family, with KCNQ2/3 heteromers being the most abundant form. KCNQ2 and KCNQ3 subunits have been found to be expressed in various neurons in the central and peripheral nervous system of rodents and humans. Previous evidence shows preferential localization of both subunits to axon initial segments, somata and nodes of Ranvier. In this work, we show the distribution and co-localization of KCNQ2 and KCNQ3 subunits throughout the hippocampal formation, via immunostaining experiments on unfixed rat brain slices and confocal microscopy. We find intense localization and colocalization to the axonal initial segment in several regions of the hippocampus, as well as staining for non-neuronal cells in the area of the lateral ventricle. We did not observe colocalization of KCNQ2 or KCNQ3 with the presynaptic protein, synaptophysin.
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