在小鼠神经肌肉连接处迅速动的骨肌肉的神经肌肉连接处,上腺素调节乙胆释放
Arsenii Arkhipov1, Nikita Zhilyakov1, Guzel Sibgatullina1
1Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, FRC Kazan, Scientific Center of RAS, 2/31 Lobachevsky St, Kazan, RT, Russia, 420111.
上腺素通过增加乙胆的释放和的进入来增强神经肌肉结点 (NMJs) 的神经递质释放. 这种效应涉及特定的上腺受体和信号通路,突出显示了快速骨肌肉中独特的上腺调节.
科学领域:
- 神经科学是一个神经科学.
- 骨肌肉生理学 骨肌肉生理学
- 上腺体信号传递
背景情况:
- 交感上腺系统调节活力,新出现的证据表明神经肌肉结 (NMJs) 是交感调解者的关键目标.
- 了解NMJs的腺激素调节对于理解神经肌肉功能和潜在的治疗干预至关重要.
研究的目的:
- 为了研究上腺素配体对神经递质释放在小鼠快速抽骨肌NMJs的调节作用.
- 阐明特定的上腺受体 (ARs) 和参与NMJs上腺激素调节的细胞内信号通路.
主要方法:
- 在levator auris longus肌肉NMJs自发和唤起的乙胆 (ACh) 释放的实验分析.
- 使用电生理学技术评估 (Ca2+) 进入运动神经末端的情况.
- 药理学操纵使用上腺素受体激素剂/对抗剂和信号分子抑制剂 (腺酸环酶,蛋白质激酶A,脂酶A2,蛋白质激酶C,G蛋白).
- 在NMJs的交感神经和上腺受体的免疫组合化学定位.
主要成果:
- 上腺素,但不是上腺素,增加了自发和引起的ACH释放和NMJs的Ca2+进入.
- 上腺素的促进作用依赖于腺酸环酶和蛋白质激酶A.
- α1-AR激活通过脂酶A2和蛋白激酶C降低了ACh的释放.
- 二醇的β2-AR激活促进了依赖G蛋白的ACH释放,而二醇则降低了它.
- 在快速的NMJ中确定了涉及G蛋白,腺烯基环酶,脂酶A2,蛋白激酶A和C的特定上腺素调节.
结论:
- 上腺素通过特定的β2-AR激活 (醇) 积极调节快速NMJ的突触传输,与α1-,α2-,和β1-AR效应不同.
- 快速NMJs表现出独特的上腺激素调节,涉及复杂的细胞内信号级联.
- 这些发现揭示了不同上腺受体和信号通路在控制神经递质释放在神经肌肉结节的特定作用.
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