寒冷和温暖加剧与疼痛相关的通道封锁效应和持久电流
Sophia Kriegeskorte1, Raya Bott1, Martin Hampl2
1University Hospital , RWTH Aachen University, Institute of Neurophysiology, Aachen, Germany.
The Journal of general physiology
|August 2, 2023
概括
调查电压通道 (Nav) 揭示了温度的影响. 较低的温度加剧了Nav1.3和Nav1.7突变效应,影响疾病表型.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 生理学 生理学 生理学
背景情况:
- 电压导入通道 (Nav) 对于刺激性组织中的动作潜能产生至关重要.
- 纳夫基因的突变会导致遗传的通道病变,其中一些具有温度敏感的表型,如疼痛综合征.
- 了解温度在通道病变中的作用是有限的,因为研究通常是在室温下进行的.
研究的目的:
- 研究四种Nav亚型 (Nav1.3,Nav1.5,Nav1.6,Nav1.7) 的温度灵敏度.
- 为了检查温度对两种与遗传性红红色肌痛 (IEM) 和性极度疼痛障碍 (PEPD) 相关的Nav1.7突变的影响.
主要方法:
- 利用自动补丁系统,从人类胚胎细胞表达和记录.
- 测试的Nav亚型和突变功能在三个温度下进行测试:15°C,25°C和35°C.
主要成果:
- 温度升高将激活的电压依赖性转移到所有测试的Nav亚型中更高极化的电位.
- Nav1.3在15°C显著减缓了无活化,导致持续电流和潜在的寒冷诱导过敏性增加.
- 在Nav1.7/I1461T突变 (PEPD) 中,受损的快速失活在15°C时显著恶化.
结论:
- 温度显著调节Nav通道门以子类型特定的方式.
- 冷却会加剧由特定的Nav1.7突变引起的门缺陷,影响细胞刺激性.
- 温度应该被认为是理解通道病变及其疾病表型的关键因素.
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