Electrical remodeling of preoptic GABAergic neurons involves the Kv1.5 subunit.

Electrical remodeling of preoptic GABAergic neurons involves the Kv1.5 subunit.
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DOI:
10.1371/journal.pone.0096643
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Tabarean IV
Tabarean IV
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Tabarean IV

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可兴奋细胞的产电机制可以适应输入、遗传缺陷或病理条件的变化,但其潜在的分子机制尚不清楚。在遗传缺失的情况下,通常观察到来自同一家族的通道亚基取代缺失的通道亚基。我们以前曾报道,尽管A型电流减少,但Kv4.2−/−视前GABA能神经元显示出与野生型神经元相同的放电特征,并且令人惊讶的是,它们呈现出延迟整流电流的稳健上调,其性质尚不清楚。在这里,使用药理学,qPCR和Western印迹,我们报告说,虽然野生型神经元表达几个Kv亚基,上调电流是由Kv1.5亚基排他地进行。因此,这项研究揭示了中枢神经元电重构的一种新机制的分子本质。
The electrogenic machinery of an excitable cell can adapt in response to changes in input, genetic deficit or in pathological conditions, however the underlying molecular mechanisms are not understood. In cases of genetic deletion it is commonly observed that a channel subunit from the same family replaces the missing one. We have previously reported that Kv4.2−/− preoptic GABAergic neurons display identical firing characteristics to those of wild-type neurons despite having reduced A-type currents, and that, surprisingly, they present a robust upregulation of a delayed rectifier current, the nature of which is unknown. Here, using pharmacology, qPCR and Western blots we report that, although the wild-type neurons express several Kv subunits, the upregulated current is conducted by the Kv1.5 subunit exclusively. Thus, this study reveals the molecular nature of a novel mechanism of electrical remodeling in central neurons.
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