Intrarenal arterial network renin content and inhibition by EMD 58265.

Intrarenal arterial network renin content and inhibition by EMD 58265.
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肾内动脉网络肾素含量和 EMD 58265 的抑制作用。

DOI:
10.1016/0895-7061(94)00073-k
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发表时间:
1995
影响因子:
3.2
通讯作者:
Zimmerman,BG
Zimmerman,BG
中科院分区:
医学3区
文献类型:
--
作者:
Birt,PC;Zimmerman,BG

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用纳克血管紧张素I/小时/毫克表示的兔肾内动脉网络(IAN)的肾素含量与同一动物肾皮质样品的肾素含量进行了比较。研究了6只家兔的组织。从一侧肾脏制备皮质组织(RC)和带有部分肾小球和附着小动脉的IAN (IAN +肾小球),从另一侧肾脏制备无肾小球的IAN (IAN -肾小球)。将这些组织匀浆,上清液在pH 7.4和37°C下孵育30至60分钟或3至6小时。血管紧张素I呈线性生成,RC、IAN +肾小球和IAN -肾小球的两个孵育周期的平均值分别为844±266、121±39和32±11 ng/h/mg。一种特异性肾素抑制剂EMD 58265在1 × 10−8mol/L浓度下可以抑制血管紧张素I的产生,而在5 × 10−8mol/L浓度下几乎完全抑制血管紧张素I的产生。结果表明,构成IAN的小动脉含有肾素,酶活性很可能是由于这种蛋白质而不是另一种天冬氨酸蛋白酶。Am J Hypertens 1995;8:433 - 436
The renin content, expressed as nanograms of angiotensin I/hour/milligram, of a rabbit intrarenal arterial network (IAN) was compared to that of renal cortical samples from the same animal. Tissues from six rabbits were studied. Cortical tissue (RC) and an IAN with some glomeruli and attached arterioles (IAN + glomeruli) were prepared from one kidney, and an IAN freed of glomeruli (IAN − glomeruli) was obtained from the opposite kidney. These tissues were homogenized and the supernatant incubated at pH 7.4 and 37°C for 30 to 60 min or 3 to 6 h. Angiotensin I was generated in a linear fashion, and the values averaged for the two incubation periods were 844 ± 266, 121 ± 39, and 32 ± 11 ng/h/mg for RC, IAN + glomeruli, and IAN − glomeruli, respectively. A specific renin inhibitor, EMD 58265, at 1 × 10−8mol/L attenuated and at 5 × 10−8mol/L almost totally abolished angiotensin I production. The results indicate that small arteries comprising the IAN contain renin, and that the enzymatic activity is most likely due to that protein and not another aspartyl protease. Am J Hypertens 1995;8:433-436
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