Norepinephrine metabolism in neuronal cultures is increased by angiotensin II.

Norepinephrine metabolism in neuronal cultures is increased by angiotensin II.
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血管紧张素 II 可以增加神经元培养物中去甲肾上腺素的代谢。

DOI:
10.1152/ajpcell.1987.252.6.c650
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发表时间:
1987
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Raizada,MK
Raizada,MK
中科院分区:
--
文献类型:
--
作者:
Sumners,C;Shalit,SL;Kalberg,CJ;Raizada,MK

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在这项研究中,我们研究了血管紧张素 II (ANG II) 对下丘脑和脑干制备的神经元脑细胞培养物中儿茶酚胺代谢的作用。从 1 日龄 Sprague-Dawley 大鼠大脑中制备的神经元培养物表现出去甲肾上腺素 (NE) 和多巴胺 (DA) 以及单胺氧化酶 (MAO) 和儿茶酚 O-甲基转移酶 (COMT) 活性的特定神经元摄取机制。通过对每种胺使用特定的神经元摄取抑制剂来确定 NE 和 DA 的单独神经元摄取位点。在之前的研究中,我们确定 ANG II (10 nM-1 microM) 通过作用于特定受体来刺激神经元 [3H]NE 摄取增加。我们在这里证实了这些结果,此外还表明 ANG II(1 nM-10 microM,10-120 分钟)对神经元 [3H]DA 摄取没有显着影响。这些结果表明 ANG II 的作用仅限于神经元培养物中的 NE 转运蛋白。 ANG II 可能会刺激至少部分被吸收的 NE 的神经元内代谢,因为该肽会刺激 MAO 活性,这是由特定 ANG II 受体介导的效应。 ANG II 对神经元培养物中的 COMT 活性没有影响。因此,利用下丘脑和脑干的神经元培养物,我们确定ANG II可以特异性改变这些区域的NE代谢,而显然不会改变DA代谢。
In this study we have examined the actions of angiotensin II (ANG II) on catecholamine metabolism in neuronal brain cell cultures prepared from the hypothalamus and brain stem. Neuronal cultures prepared from the brains of 1-day-old Sprague-Dawley rats exhibit specific neuronal uptake mechanisms for both norepinephrine (NE) and dopamine (DA), and also monoamine oxidase (MAO) and catechol O-methyltransferase (COMT) activity. Separate neuronal uptake sites for NE and DA were identified by using specific neuronal uptake inhibitors for each amine. In previous studies, we determined that ANG II (10 nM-1 microM) stimulates increased neuronal [3H]NE uptake by acting at specific receptors. We have confirmed these results here and in addition have shown that ANG II (1 nM-10 microM, 10-120 min) has no significant effects on neuronal [3H]DA uptake. These results suggest that the actions of ANG II are restricted to the NE transporter in neuronal cultures. It is possible that ANG II stimulates the intraneuronal metabolism of at least part of the NE that is taken up, because the peptide stimulates MAO activity, an effect mediated by specific ANG II receptors. ANG II had no effect on COMT activity in neuronal cultures. Therefore, the use of neuronal cultures of hypothalamus and brain stem we have determined that ANG II can specifically alter NE metabolism in these areas, while apparently not altering DA metabolism.
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