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Androgen receptor in the human thymus.

A B McCruden, W H Stimson

    Immunology Letters
    |January 1, 1984
    PubMed
    Summary

    Researchers identified a specific androgen receptor in human thymus cytosol. This receptor binds strongly to androgens like dihydrotestosterone, with 5 alpha-19 nordihydrotestosterone showing the highest affinity.

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    Area of Science:

    • Endocrinology
    • Molecular Biology
    • Immunology

    Background:

    • The thymus plays a crucial role in immune system development.
    • Androgen receptors are key mediators of androgen signaling in various tissues.

    Purpose of the Study:

    • To identify and characterize androgen binding proteins in human thymic cytosol.
    • To investigate the potential presence and properties of a 5 alpha-dihydrotestosterone receptor in the thymus.

    Main Methods:

    • Partially purified cytosol from human thymic tissue was prepared.
    • Gel chromatography was used to resolve androgen binding species from sex steroid binding globulin.
    • Binding affinity and capacity were determined using radioligand assays and competition studies with various androgenic compounds.

    Main Results:

    • A distinct androgen binding species, likely a 5 alpha-dihydrotestosterone receptor, was identified.
    • This receptor exhibited high affinity (Kd 6.7 X 10(-10) M) and low capacity (9 fmol/mg cytosol protein).
    • Methyltrienolone (R1881) confirmed high-affinity binding, and 5 alpha-19 nordihydrotestosterone demonstrated the highest affinity among tested androgens.

    Conclusions:

    • A specific, high-affinity androgen receptor exists in human thymic cytosol.
    • This finding suggests a potential role for androgens in modulating thymic function.
    • Further research is warranted to elucidate the physiological significance of this thymic androgen receptor.

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