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New developments in the vitamin D endocrine system.

H F DeLuca

    Journal of the American Dietetic Association
    |March 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Vitamin D requires liver and kidney hydroxylation for activation, ultimately regulating calcium and phosphorus transport. This vitamin D hormone acts on cell nuclei to influence genetic transcription for nutrient transport proteins.

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    A new, highly sensitive assay for 1,25-dihydroxyvitamin D not requiring high-performance liquid chromatography: application of monoclonal antibody against vitamin D receptor to radioreceptor assay.

    Analytical biochemistry·1992

    Area of Science:

    • Endocrinology
    • Biochemistry
    • Mineral Metabolism

    Background:

    • Vitamin D metabolism is crucial for calcium and phosphorus homeostasis.
    • Sequential hydroxylation steps are essential for vitamin D activation.

    Purpose of the Study:

    • To elucidate the metabolic pathways of vitamin D activation.
    • To describe the regulatory mechanisms of vitamin D hormone action.
    • To discuss the role of vitamin D in mineral metabolism disorders.

    Main Methods:

    • Review of vitamin D metabolic pathways.
    • Analysis of evidence for activation mechanisms.
    • Discussion of regulatory factors for 1 alpha-hydroxylation.
    • Description of vitamin D hormone-receptor interactions in target tissues.

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    Main Results:

    • Vitamin D undergoes 25-hydroxylation (liver) and 1-hydroxylation (kidney) for activation.
    • Only 25- and 1-hydroxylation pathways are identified as activation mechanisms.
    • 1 alpha-hydroxylation is regulated by calcium and phosphorus needs.
    • The active form, 1,25-dihydroxyvitamin D3, binds to nuclear receptors to regulate gene transcription.

    Conclusions:

    • The vitamin D endocrine system is vital for calcium and phosphorus metabolism.
    • Disturbances in vitamin D metabolism are linked to mineral metabolism diseases.
    • Understanding vitamin D metabolites is key for therapeutic applications.