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Journal of Lipid Research, Vol 29, 523-526, Copyright © 1988 by Lipid Research, Inc.

ARTICLES

Radioimmunoassay of chenodeoxycholic acid-3-sulfate in urine

M Matsuoka and M Okumura
Department of Internal Medicine, Fukuoka University School of Medicine, Japan.

A sensitive and specific radioimmunoassay (RIA) for the measurement of urinary total chenodeoxycholic acid-3-sulfate (SCDCA) was developed and the accuracy was confirmed. SCDCA bound to bovine serum albumin as the antigen and emulsified with Freund's complete adjuvant was injected into rabbits. The antiserum obtained was capable of binding 75% of [11,12-3H]SCDCA at 1:1000 dilution. The percentage of bound radioactivity decreased linearly with logarithmic increases in unlabeled SCDCA, from 8 to 200 pmol/ml. The antiserum showed an extremely high specificity for SCDCA (free and conjugated), and the values determined by RIA indicated a close correlation with those found by gas-liquid chromatography. The daily urinary SCDCA level was determined using SCDCA-RIA in 12 disease-free humans and 74 patients with chronic liver diseases. In the normal subjects the daily urinary SCDCA level was 0.74 +/- 0.83 mg/day and increased levels were evident in all groups with chronic liver diseases. The daily urinary SCDCA level corresponds closely with the extent of hepatic dysfunction.
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