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Radioimmunoassay of cholecystokinin in human plasma


A sensitive radioimmunoassay for cholecystokinin (CCK) has been developed. Porcine CCK-33 was labelled by conjugation with 125I-hydroxyphenyl-propionic acid succinimide ester. Antibodies were raised against porcine CCK-33 covalently coupled to egg albumin. Plasma samples were extracted with 96% ethanol prior to assay. Free and bound hormone were separated by dextran-coated charcoal. The antibodies bound CCK-8 and CCK-33 with equimolar potency. The assay detection limit was 1 pmol/l plasma. Within and between assay coefficients of variation were +/- 12.7 and 13.0% at mean plasma CCK concentrations of 13.2 and 13.6 pmol/l. The concentration of CCK in 47 normal fasting subjects ranged from undetectable to 22 pmol/l. Ingestion of a mixed meal in 9 normal subjects increased the plasma concentration from 8.3 +/- 2.5 S.E. to 24.4 +/- 6.5 pmol/l.

Type Journal
ISBN 0009-8981 (Print)
Authors Byrnes, D. J.;Henderson, L.;Borody, T.;Rehfeld, J. F. :
Published Date 1981-01-01
Published Volume 111
Published Issue 1
Published Pages 81-9
Status Published in-print
URL link to publisher's version