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A radioinhibitor binding assay and an enzyme inhibition assay have been developed to measure plasma levels of CGP 38 560, a potent human renin inhibitor. The detection limit of the assays was between 0.5 and 1 pmol/ml. There was a good correlation (r = 0.989) between the two assays for the measurement of human plasma spiked with CGP 38 560 in concentrations from 1.9 nM to 12 microM. Intra-assay variability was 6.1-17.3% and 4.4-27.2% for the radioinhibitor binding assay and the enzyme inhibition assay, respectively. Interassay variability was 6.0-28.2% and 3.8-28.4% for the radioinhibitor binding assay and the enzyme inhibition assay, respectively. Blood samples were collected during a pharmacological study performed in normotensive human volunteers on an unrestricted diet who were infused during a 30-minute period with CGP 38 560 A (50 micrograms/kg). Similar values for the concentrations of renin inhibitor in plasma were obtained with the radioinhibitor binding assay and the enzyme inhibitor assay, and there was a significant correlation between values obtained with the two different methodologies (r = 0.94). The plasma levels of renin inhibitor reached a maximum at the end of infusion and then decreased rapidly, indicating a short plasma half-life. The changes in biochemical parameters, plasma renin activity, and plasma concentration of active renin could be related to the concentrations of CGP 38 560 measured in the plasma.

Assays to measure nanomolar levels of the renin inhibitor CGP 38 560 in plasma.