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Related Experiment Videos

Digoxin-like immunoreactivity: occurrence in three molecular forms and partial characterization.

L Shilo, M M Werber, S Dolev

    The Journal of Clinical Endocrinology and Metabolism
    |June 1, 1987
    PubMed
    Summary
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    Digoxin-like immunoreactivity (DLI) exists in multiple forms in the body. Researchers identified protein-bound, glucuronidated, and free forms of DLI in serum and urine samples.

    Area of Science:

    • Biochemistry
    • Endocrinology

    Background:

    • Digoxin-like immunoreactivity (DLI) is detected in various physiological and pathological states, including uremia, liver disease, pregnancy, and the neonatal period.
    • The exact physicochemical nature of DLI remains largely unknown, necessitating further investigation.

    Purpose of the Study:

    • To elucidate the physicochemical characteristics of DLI found in human serum and urine.
    • To identify and differentiate the various forms of DLI present in biological samples.

    Main Methods:

    • Gel filtration chromatography was employed to determine molecular weights.
    • Extraction with methylene chloride was used to isolate DLI.
    • Treatment with beta-glucuronidase was performed to assess glucuronidated forms.

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    Main Results:

    • DLI was characterized into three forms: protein-bound (mol wt 5000), glucuronidated (mol wt 400), and free (mol wt 230).
    • In serum, DLI predominantly exists as protein-bound and free forms.
    • In urine, DLI is found in both glucuronidated and free states.

    Conclusions:

    • DLI exhibits distinct molecular forms depending on the biological matrix (serum vs. urine).
    • The presence of different DLI forms suggests complex metabolic or regulatory roles in various physiological and pathological conditions.