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Citation Information: J Clin Invest. 1976;57(5):1109-1116. https://doi.org/10.1172/JCI108377.
Abstract
The distribution, blood transport, and metabolic clearance of physiological concentrations of antidiuretic hormone were studied in 10 hydrated normal subjects with radioiodinated arginine vasopressin (125I-AVP). At 37 degrees C no binding of 125I-AVP to plasma proteins could be demonstrated, but some metabolites were associated with plasma proteins. 125I-AVP was rapidly distributed into a space approximating the extracellular fluid volume. Metabolic breakdown products became demonstrable within minutes after injection. The mean metabolic clearance rate of 125I-AVP was 4.1 ml/min/kg and the mean plasma half-life 24.1 min. Renal clearance had a mean value of 80 ml/min and accounted for 27% of the total metabolic clearance. It is concluded that in man antidiuretic hormone circulates as a free (non-protein bound) peptide, diffuses readily into the extracellular fluid space, and is metabolized within minutes. A plasma half-life of 24 min is consistent with the duration of antidiuresis after hormone administration or release.
Authors
G Baumann, J F Dingman
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