A highly sensitive and rapid radioimmunoassay for the determination of arginine8-vasopressin

Gerbes, Alexander L.; Witthaut, R.; Samson, W. R.; Schnizer, W. und Vollmar, Angelika M. (1992): A highly sensitive and rapid radioimmunoassay for the determination of arginine8-vasopressin. In: European journal of clinical chemistry and clinical biochemistry, Bd. 30: S. 229-233

Abstract

A highly sensitive radioimmunossay for arginine8-vasopressin (argipressin; INN) measurement was developed using Amberlite XAD 2 resin columns to extract arginine8-vasopressin from acidified human plasma. Arginine8-vasopressin was determined by a rapid radioimmunoassay method (2 x 20 h) using a specific antibody and 125I-labelled antigen. The bound fraction was separated by adsorption of the free fraction onto bovine serum albumin-coated charcoal; this resulted in low unspecific binding of less than 2%. Recovery experiments in the physiological range resulted in a mean (+/- SEM) recovery of 88 +/- 3%. The radioimmunoassay consistently yielded a detection limit of 0.3 ng/l (ED90) and a mean 50% binding intercept (ED50) of 3.5 ng/l. Arginine8-vasopressin immunoreactivity was characterized by reverse-phase high performance liquid chromatography, which confirmed the specificity of the assay. Serial plasma dilution curves paralleled the standard curve. The intra- and inter-assay variations were 9.4% and 15%, respectively. Arginine8-vasopressin concentrations in healthy subjects were determined in normal hydration status (2.2 +/- 0.3 ng/l; n = 11), as well as during suppression by water immersion (1.5 +/- 0.2 ng/l; n = 11) or by water loading (1.6 +/- 0.2 ng/l; n = 8). Thus, this assay allows for a sensitive, accurate and rapid quantification of plasma arginine8-vasopressin concentrations.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 0939-4974
• Signatur: UBM:0760/4 Med.GZ 62(30