Nicotinic acetylcholine receptor channels in cat chemoreceptor cells.

Nicotinic acetylcholine receptor channels in cat chemoreceptor cells.
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猫化学感受器细胞中的烟碱乙酰胆碱受体通道。

DOI:
10.1007/978-1-4419-9280-2_37
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发表时间:
2003
影响因子:
--
通讯作者:
Shirahata,Machiko
Shirahata,Machiko
中科院分区:
医学4区
文献类型:
--
作者:
Higashi,Tomoko;Yamaguchi,Shigeki;McIntosh,JMichael;Shirahata,Machiko

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神经递质可能在颈动脉体的低氧化学传递中起关键作用。在多种神经递质中,ACh似乎是猫颈动脉体中的一种主要兴奋性神经递质(Fitzgerald,2000)。ACh可以直接作用于传入神经末梢并产生动作电位(Hayashida等人,1980; Zhong & Nurse,1997)。或者,ACh可以通过颈动脉体化学感受细胞、血管球细胞中的烟碱型ACh受体(nAChR)起作用,并调节神经递质的释放(Fidone et al.,1990年)。我们最近的数据表明,在猫血管球细胞中存在nAChR的α 3、α 4、β 2和β 4亚基,但不存在α 7亚基(Hirasawa et al.,在这本书中; Shirahata等人,1998年)。烟碱型乙酰胆碱受体属于配体门控离子通道,由5个受体亚基组成。它们的亚基组成将nAChRs分为三种受体类型:(1)肌肉型nAChRs,(2)由β亚基(α 2 -6)和β亚基(β 2 -4)组成的异聚型神经元型nAChRs,(3)仅由α亚基(α 7 -9)组成的同源型神经元型nAChRs。它们的化学计量和它们的电生理特性取决于亚基组成(麦基希和Role,1995; Lindstrom等人,1996年)。由于神经元nAChR通道对Ca ~(2+)和Na ~+具有渗透性,因此它们的激活可显著影响血管球细胞的兴奋性和形态。在这项研究中,我们研究了nAChRs在血管球细胞的电生理和药理学特性,并推断其在血管球细胞的兴奋性的作用。
Neurotransmitters are likely to play a key role for hypoxic chemotransmission in the carotid body. Among several neurotransmitters, ACh appears to be a major excitatory neurotransmitter in the cat carotid body (Fitzgerald, 2000). ACh may act directly on the afferent nerve endings and generates action potentials (Hayashida et al., 1980; Zhong & Nurse, 1997). Alternatively, ACh may work through nicotinic ACh receptors (nAChRs) in the carotid body chemosensory cells, glomus cells, and modulate the release of neurotransmitters (Fidone et al., 1990). Our recent data have shown the presence of ¦Á3, ¦Á4, ¦Â2 and ¦Â4, but not ¦Á7, subunits of nAChRs in the cat glomus cells (Hirasawa et al., in this book; Shirahata et al., 1998). Nicotinic AChRs belong to ligand-gated ion channels, that are composed of five receptor subunits. Their subunit compositions categorize nAChRs into three receptor types: (1) muscle type nAChRs, (2) heteromeric type neuronal nAChRs that consist of ¦Á subunits (¦Á2-6) and ¦Â subunits (¦Â2-4), and (3) homomeric type neuronal nAChRs that consist of only a subunits (¦Á7-9). Their stoichiometry and their electrophysiological characteristics depend on the subunit compositions (McGehee & Role, 1995; Lindstrom et al., 1996). Since neuronal nAChR channels are permeable to Ca2+and Na+ions, their activation could significantly influence the excitability and fonction of glomus cells. In this study we examined electrophysiological and pharmacological characteristics of nAChRs in glomus cells and infer their role in the excitability of glomus cells.
乙酰胆碱增加成年猫动脉化学感受器细胞的细胞内钙。
DOI: 10.1152/jn.1997.78.5.2388
发表时间: 1997
期刊: Journal of neurophysiology.
影响因子: --
作者:
Shirahata,M;Fitzgerald,RS;Sham,JS
通讯作者: Sham,JS
新生大鼠颈动脉体分离I型细胞中烟碱乙酰胆碱受体
DOI: --
发表时间: 1993
期刊: Neuroscience
影响因子: 3.3
作者:
C. Wyatt;C. Peers
通讯作者: C. Peers
离解细胞培养物中大鼠岩感觉神经元烟碱乙酰胆碱敏感性
DOI: --
发表时间: 1997
期刊: Brain Research
影响因子: 2.9
作者:
H. Zhong;C. Nurse
通讯作者: C. Nurse
猫颈动脉化学感应单元中存在多种胆碱能受体。
DOI: 10.1007/978-1-4419-9280-2_41
发表时间: 2003
影响因子: --
作者:
Hirasawa,Serabi;Mendoza,JeffreyA;Jacoby,DavidB;Kobayashi,Chiyoko;Fitzgerald,RobertS;Schofield,Brian;Chandrasegaran,Srinivasan;Shirahata,Machiko
通讯作者: Shirahata,Machiko