Physiology of quantal norepinephrine release from somatodendritic sites of neurons in locus coeruleus.

Physiology of quantal norepinephrine release from somatodendritic sites of neurons in locus coeruleus.
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蓝斑神经元体树突部位量子去甲肾上腺素释放的生理学

DOI:
10.3389/fnmol.2012.00029
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发表时间:
2012
影响因子:
4.8
通讯作者:
Zhou Z
Zhou Z
中科院分区:
医学2区
文献类型:
--
作者:
Huang HP;Zhu FP;Chen XW;Xu ZQ;Zhang CX;Zhou Z

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蓝斑 (LC) 神经元的神经末梢释放的去甲肾上腺素 (NE) 约占灵长类动物大脑细胞外 NE 总量的 70%。此外,LC神经元还从体树突部位释放NE。 LC神经元胞体释放的量子NE具有潜伏期长、神经活动依赖性、α2肾上腺素能自身受体自身抑制等特点。体细胞中刺激-分泌耦合的独特动力学受到动作电位模式的调节。体细胞和树突释放的生理意义是产生负反馈并下调神经元过度活跃,从而抑制 LC 的轴突末端投射到许多脑区的 NE 释放。最近关于 LC 体细胞树突释放的发现可能为涉及 LC-NE 系统功能障碍的临床疾病的发病机制提供新的见解,并可能有助于开发针对 LC 区域的治疗方法。
Norepinephrine (NE) released from the nerve terminal of locus coeruleus (LC) neurons contributes to about 70% of the total extracellular NE in primates brain. In addition, LC neurons also release NE from somatodendritic sites. Quantal NE release from soma of LC neurons has the characteristics of long latency, nerve activity-dependency, and autoinhibition by α2-adrenergic autoreceptor. The distinct kinetics of stimulus-secretion coupling in somata is regulated by action potential patterns. The physiological significance of soma and dendritic release is to produce negative-feedback and to down-regulate neuronal hyperactivity, which consequently inhibit NE release from axon terminal of LC projecting to many brain areas. Recent discoveries about the LC somatodendritic release may provide new insights into the pathogenesis of clinic disease involving LC-NE system dysfunction, and may help developing remedy targeted to the LC area.
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