Nitric oxide and cyclic nucleotide signal transduction modulates synaptic vesicle turnover in human model neurons

Nitric oxide and cyclic nucleotide signal transduction modulates synaptic vesicle turnover in human model neurons
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一氧化氮和环核苷酸信号转导调节人类模型神经元的突触小泡周转

DOI:
10.1111/j.1471-4159.2009.06421.x
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发表时间:
2009
影响因子:
4.7
通讯作者:
G Bicker
G Bicker
中科院分区:
医学2区
文献类型:
--
作者:
Tegenge MA;Stern M;G Bicker

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人 Ntera2 (NT2) 畸胎癌细胞系可被诱导分化为有丝分裂后神经元。在这里,我们报告说,通过球形聚集细胞培养方法产生的人类 NT2 神经元,根据体外培养的长度,沿神经突表达典型突触前蛋白(突触蛋白和突触结合蛋白 I)的水平不断增加。通过使用针对突触结合蛋白 I 管腔结构域的抗体和荧光染料 N-(3-三乙基铵丙基)-4-(4-(二丁基氨基)苯乙烯基)吡啶鎓二溴化物,我们发现去极化的 NT2 神经元表现出钙依赖性外吞内吞突触小泡再循环。 NT2 神经元表达神经元一氧化氮合酶和可溶性鸟苷酸环化酶 (sGC) 的神经元亚型,后者是一氧化氮 (NO) 的主要受体。我们测试了 NO 信号转导是否调节人类 NT2 神经元的突触小泡周转。 NO 供体和环状鸟苷单磷酸类似物增强了突触小泡的再循环,而 sGC 抑制剂则阻断了 NO 供体的作用。两个 NO 供体硝普钠和 N-乙基-2-(1-乙基-2-羟基-2-亚硝基肼)乙胺引起囊泡胞吐作用,该胞吐作用被 sGC 抑制剂部分阻断。腺苷酸环化酶的激活剂毛喉素和 cAMP 类似物通过平行作用的蛋白激酶 A 途径诱导突触小泡回收和胞吐作用。我们来自 NT2 神经元的数据表明,NO/环核苷酸信号通路可能促进人脑细胞中神经递质的释放。
The human Ntera2 (NT2) teratocarcinoma cell line can be induced to differentiate into post‐mitotic neurons. Here, we report that the human NT2 neurons generated by a spherical aggregate cell culture method express increasing levels of typical pre‐synaptic proteins (synapsin and synaptotagmin I) along the neurite depending on the length ofin vitroculture. By employing an antibody directed against the luminal domain of synaptotagmin I and the fluorescent dyeN‐(3‐triethylammoniumpropyl)‐4‐(4‐(dibutylamino)styryl)pyridinium dibromide, we show that depolarized NT2 neurons display calcium‐dependent exo‐endocytotic synaptic vesicle recycling. NT2 neurons express the neuronal isoform of neuronal nitric oxide synthase and soluble guanylyl cyclase (sGC), the major receptor for nitric oxide (NO). We tested whether NO signal transduction modulates synaptic vesicle turnover in human NT2 neurons. NO donors and cylic guanosine‐monophosphate analogs enhanced synaptic vesicle recycling while a sGC inhibitor blocked the effect of NO donors. Two NO donors, sodium nitroprusside, and andN‐Ethyl‐2‐(1‐ethyl‐2‐hydroxy‐2‐nitrosohydrazino) ethanamine evoked vesicle exocytosis which was partially blocked by the sGC inhibitor. The activator of adenylyl cyclase, forskolin, and a cAMP analog induced synaptic vesicle recycling and exocytosis via a parallel acting protein kinase A pathway. Our data from NT2 neurons suggest that NO/cyclic nucleotide signaling pathways may facilitate neurotransmitter release in human brain cells.
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