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Related Experiment Videos

An improved method for estimating cholecystokinin in human serum

C E Marshall, E H Egberts, A G Johnson

    The Journal of Endocrinology
    |October 1, 1978
    PubMed
    Summary

    A refined biological assay for cholecystokinin (CCK) accurately measures serum levels. This improved method accounts for serum interference and processing artifacts, yielding lower, more reliable CCK measurements.

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    Area of Science:

    • Endocrinology
    • Gastroenterology
    • Biochemical Assays

    Background:

    • Radioimmunoassays for cholecystokinin (CCK) present challenges, necessitating a reliable biological assay.
    • Previous biological methods for CCK estimation reported high serum levels and required further validation.

    Purpose of the Study:

    • To develop and validate a sensitive and reliable biological assay for measuring serum cholecystokinin (CCK).
    • To address limitations in existing biological assays, including serum interference and variable gall-bladder strip sensitivity.

    Main Methods:

    • Optimized gall-bladder strip sensitivity using a 'priming' technique with serum samples.
    • Removed non-peptide CCK-like activity using dextran-coated charcoal extraction.
    • Prevented CCK activity increase during sample processing by using aprotinin.

    Main Results:

    • The refined assay demonstrated consistent gall-bladder strip sensitivity.
    • Accurate quantification of CCK by subtracting non-peptide activity.
    • Minimized CCK degradation during sample handling.

    Conclusions:

    • The validated biological assay provides accurate serum CCK measurements.
    • Mean fasting serum CCK levels in normal subjects were determined to be 28 milli Ivy Dog units/ml (2.4 pmol/ml).
    • This represents a significant reduction compared to previously reported levels, highlighting assay improvements.

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