Radioimmunoassay for immunoreactive [des-Leu10]-angiotensin I

Peptides. 1989 May-Jun;10(3):489-92. doi: 10.1016/0196-9781(89)90133-2.


A specific radioimmunoassay for the angiotensin-derived peptide [des-Leu10]-angiotensin I (AI-dL) is described. Antisera obtained from rabbits injected with immunogen prepared by coupling bovine beta-thyroglobulin to the peptide with carbodiimide were specific to this peptide and did not recognise related angiotensin peptides such as AI, AII, AIII, nor did they recognise other peptides such as bradykinin, substance P, bombesin or dynorphin(1-8). Immunoreactive AI-dL was detected for the first time in the plasma of rats and humans following purification by HPLC at concentrations of 78 and 40 pg/ml, respectively. Concentrations of AI-dL are increased following chronic administration of captopril to rats.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Angiotensin I / analogs & derivatives*
  • Angiotensin I / blood
  • Angiotensin I / isolation & purification
  • Animals
  • Chromatography, High Pressure Liquid
  • Cross Reactions
  • Humans
  • Immune Sera
  • Rabbits / immunology
  • Radioimmunoassay / methods
  • Rats


  • Immune Sera
  • angiotensin I, des-Leu(10)-
  • Angiotensin I