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Rat calcium-binding proteins: distribution, development, and vitamin D dependence

M Thomasset, C O Parkes, P Cuisinier-Gleizes

    The American Journal of Physiology
    |December 1, 1982
    PubMed
    Summary

    This study examined two calcium-binding proteins (CaBPs) in rats, finding distinct tissue distribution and developmental patterns. Vitamin D influenced duodenal and kidney CaBPs, suggesting a link to cell turnover.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Physiology

    Background:

    • Calcium-binding proteins (CaBPs) play crucial roles in cellular functions.
    • Two distinct CaBPs, 28 kDa and 10 kDa, were investigated for their characteristics in rats.

    Purpose of the Study:

    • To determine the tissue distribution of 28 kDa and 10 kDa CaBPs in rats.
    • To analyze developmental changes in CaBP levels.
    • To investigate the vitamin D dependence of these CaBPs.

    Main Methods:

    • Radioimmunoassays utilizing specific antibodies were employed.
    • Antibodies were specific for human cerebellar CaBP (28 kDa) and rat intestinal CaBP (10 kDa).
    • Tissue distribution, developmental changes, and vitamin D effects were assessed.

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    Main Results:

    • The 28 kDa CaBP was abundant in the cerebellum and kidney; the 10 kDa CaBP was concentrated in the duodenum, jejunum, and cecum.
    • Both CaBPs were present before birth, reached adult levels by 30 days postpartum, and declined after 2 months.
    • Duodenal and kidney CaBPs showed vitamin D dependence, unlike the cerebellar CaBP.

    Conclusions:

    • Rat CaBPs exhibit tissue-specific distribution and developmental profiles.
    • Vitamin D dependence of certain CaBPs may be related to cell turnover rates.
    • The findings provide insights into the physiological roles of CaBPs in different rat tissues.