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JoVE Core
Pharmacology
神经递质的分类
神经递质的分类
JoVE Core
Pharmacology
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JoVE Core Pharmacology
Classification of Neurotransmitters

5.3: 神经递质的分类

5,389 Views
01:30 min
September 22, 2023
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Please note that some of the translations on this page are AI generated. Click here for the English version.

Overview

神经递质在自主神经系统的神经元间的通讯中起着关键作用。自主神经系统中的神经元可以是胆碱能的或肾上腺素能的,这取决于合成的神经递质。胆碱能神经元使用乙酰胆碱作为主要神经递质。这包括交感神经的前神经纤维以及副交感神经系统的前后神经纤维。此外,躯体神经系统的神经元在神经肌接头也使用乙酰胆碱。相反,肾上腺素能神经元使用去甲肾上腺素(也称为去甲肾上腺素)作为主要神经递质。交感神经分支的后神经元使用去甲肾上腺素进行传递。此外,肾上腺髓质会释放一种由肾上腺素和去甲肾上腺素组成的混合物。

除了乙酰胆碱和去甲肾上腺素,非肾上腺素能非胆碱能(NANC)递质也参与自主神经传递。这包括ATP、神经肽Y(NPY)、血管活性肠肽(VIP)和一氧化氮,它们在后神经元神经末梢起作用。在节后传递中参与的γ-氨基丁酸(GABA)、5-羟色胺(5-HT)、多巴胺和物质P等递质也被称为NANC。

有时,在释放过程中,神经递质通常伴随着共同递质。共同递质帮助主要神经递质到达远程目标并产生持续的效果。例如,乙酰胆碱经常与VIP相关联,而乙酰胆碱和去甲肾上腺素与ATP相关联。共同递质与神经递质分开存储在囊泡中。尽管如此,某些共同递质,如s ATP,可能存储在与去甲肾上腺素相同的囊泡中。共同递质也可以作为替代递质,对突触产生营养效应。

Transcript

神经递质是在两个神经元之间或从神经元到效应器官传递信号的化学信使。自主神经系统或 ANS 中的神经元是胆碱能能的或肾上腺素能的,具体取决于释放的神经递质乙酰胆碱或去甲肾上腺素。

乙酰胆碱促进节前神经元与交感神经系统和副交感神经系统自主神经节之间的信号传递。

乙酰胆碱还介导神经肌肉传递,诱导 SNS 中的随意肌收缩。

此外,副交感神经分裂的节后神经元本质上是胆碱能的。

在交感神经部门,节后神经元具有肾上腺素能并释放去甲肾上腺素。此外,肾上腺髓质释放肾上腺素和去甲肾上腺素的混合物。

一些 NANC (非肾上腺素能非胆碱能) 递质,例如血管活性肠肽或 VIP,也介导自主神经传递。

大多数神经元同时释放不止一种神经递质。例如,在胆碱能神经元中,VIP 与乙酰胆碱共同传播。

每种神经递质都刺激特定受体并调节突触前或突触后效应。

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神经递质 自主神经系统 胆碱能神经元 肾上腺素能神经元 乙酰胆碱 去甲肾上腺素 去甲肾上腺素 节后纤维 非肾上腺素能非胆碱能 (NANC) ATP 神经肽 Y (NPY) 血管活性肠肽 (VIP) 一氧化氮 共递质 神经节传递 P 物质

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