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兔血浆中肾素底物的特性及其测定方法的说明

Properties of renin substrate in rabbit plasma with a note on its assay.

作者信息

Ryan J W, McKenzie J K

出版信息

Biochem J. 1968 Jul;108(4):687-92. doi: 10.1042/bj1080687.

Abstract
  1. Rabbit plasma enzymes that degrade angiotensin I are inhibited completely by the combination of 2,3-dimercaptopropan-1-ol (10mm), EDTA (10mm) and chlorhexidine gluconate (0.005%, w/v). These compounds do not modify the reaction of renin with renin substrate and are termed the selective inhibitors. 2. The renin substrate concentration of plasma can be measured as angiotensin I content by incubating plasma plus the selective inhibitors with renin for a time sufficient to allow complete utilization of renin substrate. 3. This reaction obeys first-order kinetics to substrate concentrations of at least 1000ng. of angiotensin I content/ml. In general, the renin substrate concentrations of normal rabbit plasmas are less than 1000ng. of angiotensin I content/ml. Thus the time required for the complete release of angiotensin I from normal plasma is inversely related to renin activity and is independent of renin substrate concentration. 4. A method for the assay of renin substrate, taking these reaction kinetics into account, is presented.
摘要
  1. 2,3 - 二巯基丙醇(10mmol)、乙二胺四乙酸(10mmol)和葡萄糖酸氯己定(0.005%,w/v)的组合可完全抑制兔血浆中降解血管紧张素I的酶。这些化合物不会改变肾素与肾素底物的反应,被称为选择性抑制剂。2. 通过将血浆与选择性抑制剂一起孵育,再加入肾素一段足以使肾素底物完全被利用的时间,血浆中的肾素底物浓度可以通过血管紧张素I含量来测量。3. 该反应对至少1000ng血管紧张素I含量/毫升的底物浓度遵循一级动力学。一般来说,正常兔血浆中的肾素底物浓度低于1000ng血管紧张素I含量/毫升。因此,从正常血浆中完全释放血管紧张素I所需的时间与肾素活性呈负相关,且与肾素底物浓度无关。4. 提出了一种考虑这些反应动力学的肾素底物测定方法。

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