Characterization of norepinephrine accumulation by a crude synaptosomal-mitochondrial fraction isolated from rat heart.

Characterization of norepinephrine accumulation by a crude synaptosomal-mitochondrial fraction isolated from rat heart.
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从大鼠心脏中分离出的粗制突触体-线粒体组分对去甲肾上腺素积累的表征。

DOI:
10.1016/0024-3205(91)90528-j
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发表时间:
1991
期刊:
影响因子:
6.1
通讯作者:
Roberts,J
Roberts,J
中科院分区:
医学2区
文献类型:
--
作者:
Aloyo,VJ;McIlvain,HB;Bhavsar,VH;Roberts,J

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在神经元摄取(1型)与时间和蛋白质浓度呈线性关系的条件下,评估了心脏突触体-线粒体部分的去甲肾上腺素(NE)摄取。NE积累过程对培养温度、钠离子浓度和介质渗透压敏感。此外,NE摄取被神经元摄取抑制剂去甲丙咪嗪(DEMETHYMIMPRAMINE)以浓度依赖性方式衰减; IC 50值约为10 nM,在100 nM时获得最大抑制。与此相反,神经元摄取抑制剂,metanetamine没有显着减弱NE的摄取。动力学分析表明,对NE敏感的累积是饱和的,Km约为400 nM,NE摄取通过单一摄取过程发生。神经元型NE摄取的突触体-线粒体部分的这一证明构成了含有功能性突触体的大鼠心脏亚细胞部分的制备的成功证明。
Norepinephrine (NE) uptake into a heart synaptosomal-mitochondrial fraction was assessed under conditions where neuronal uptake (type 1) was linear with respect to both time and protein concentration. The NE accumulation process was sensitive to incubation temperature, sodium ion concentration and medium osmolality. Furthermore, NE uptake was attenuated by the neuronal uptake inhibitor desmethylimipramine (DMI) in a concentration dependent manner; the IC50value was approximately 10 nM and maximum inhibition was obtained at 100 nM. In contrast, the extraneuronal uptake inhibitor, metanephrine did not significantly attenuate NE uptake. Kinetic analysis demonstrated that the DMI sensitive NE accumulation is saturable with a KMof approximately 400 nM and that NE uptake occurs via a single uptake process. This demonstration of neuronal type NE uptake by a synaptosomal-mitochondrial fraction constitutes a successful demonstration of the preparation of a rat heart subcellular fraction containing functional synaptosomes.
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DOI: --
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期刊: The Journal of pharmacology and experimental therapeutics
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