Changes in the number, function, and regulation of nicotinic acetylcholine receptors during neuronal development.

Changes in the number, function, and regulation of nicotinic acetylcholine receptors during neuronal development.
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神经元发育过程中烟碱乙酰胆碱受体的数量、功能和调节的变化。

DOI:
10.1016/0012-1606(89)90183-8
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发表时间:
1989
影响因子:
2.7
通讯作者:
Gurantz,D
Gurantz,D
中科院分区:
生物学3区
文献类型:
--
作者:
Margiotta,JF;Gurantz,D

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研究了新分离鸡睫状神经节神经元乙酰胆碱受体(AChR)的发育。胚胎第8 ~ 16天,单位膜乙酰胆碱反应和表面乙酰胆碱还原酶密度均增加,对乙酰胆碱的表观亲和力降低。achr的单通道电导分别为25和40 pS,单通道事件的分布在发育过程中发生偏移;在E8时,两种电导的事件同样罕见,而在E14时,有许多事件,大多数是40 pS。25和40 pS事件的开放持续时间有两个平均值。在E8和E14期间,25个pS事件的开放寿命没有变化,而40个pS事件的开放寿命增加,并且到E14时大多数都很长。大约在E10时,神经元的乙酰胆碱反应也变得敏感,受camp依赖机制的调节。观察到的变化可能反映了受体调控和AChR亚型差异表达所需的加工的发育控制。
Acetylcholine receptor (AChR) development was examined in neurons freshly isolated from chick ciliary ganglia. Between Embryonic Day 8 (E8) and 16, both the ACh response per unit membrane and the density of surface AChRs increased, while the apparent affinity for ACh decreased. AChRs had single-channel conductances of 25 and 40 pS. The distribution of single-channel events shifted during development; at E8 events of both conductances were equally rare, while by E14 there were many events and most were 40 pS. The open durations of 25 and 40 pS events had two mean values. The open lifetimes of the 25 pS events did not change between E8 and E14, while the lifetimes of the 40 pS events increased, and by E14 most were long. The ACh response of the neurons also became sensitive to regulation by a cAMP-dependent mechanism at about E10. The observed changes may reflect developmental control over processing required for receptor regulation and differential expression of AChR subtypes.
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