Sandwich radioimmunoassay of human plasma renin using two monoclonal antibodies.

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Abstract
Plasma immunoreactive renin was measured by sandwich radioimmunoassay, under various physiological and pathological conditions. Enzymatic activities of active renin and trypsin-activatable inactive renin were also measured. There was a significant correlation between plasma immunoreactive renin concentration (IRRC) and total (active plus inactive) renin concentration, as estimated by enzymatic activity. In plasma from normotensive volunteers and hypertensive patients, the IRRC were 279 +/- 37 pg/ml and 268 +/- 29 pg/ml, respectively. After the intravenous injection of furosemide, the plasma IRRC in normotensive volunteers increased significantly. IRRC was significantly higher in plasma from juvenile diabetics than in plasma from age-matched disease-free children. Thus, renin secretion in children with diabetes mellitus is increased.

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