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Related Experiment Videos

Stromal 5 alpha-reductase activity is elevated in benign prostatic hyperplasia.

R P Wilkin, N Bruchovsky, T K Shnitka

    Acta Endocrinologica
    |June 1, 1980
    PubMed
    Summary

    The prostate stroma is the main site for converting testosterone to dihydrotestosterone, primarily due to 5 alpha-reductase enzyme activity. Benign prostatic hyperplasia shows significantly higher stromal 5 alpha-reductase levels.

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    Area of Science:

    • Biochemistry
    • Urology
    • Endocrinology

    Background:

    • 5 alpha-reductase and 3 alpha (beta)-hydroxysteroid dehydrogenase are key enzymes in androgen metabolism.
    • Prostate tissue comprises stromal and epithelial compartments with distinct cellular functions.

    Purpose of the Study:

    • To investigate the activity and localization of 5 alpha-reductase and 3 alpha (beta)-hydroxysteroid dehydrogenase in normal, hyperplastic, and cancerous human prostates.
    • To determine the role of these enzymes in the stromal and epithelial compartments of the prostate.

    Main Methods:

    • Enzyme activity assays were performed on homogenates of prostate stroma and epithelium.
    • Samples were obtained from normal, hyperplastic, and carcinomatous human prostates.
    • Statistical analysis (Student's t-test) was used to compare enzyme activities.

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    Main Results:

    • 5 alpha-reductase was predominantly localized in the prostate stroma.
    • 3 alpha (beta)-hydroxysteroid dehydrogenase activity was distributed more evenly between stroma and epithelium.
    • Stromal 5 alpha-reductase activity was significantly higher in hyperplastic prostates compared to normal prostates (P < 0.05).

    Conclusions:

    • The prostate stroma is the primary site for testosterone to dihydrotestosterone conversion due to high 5 alpha-reductase prevalence.
    • Benign prostatic hyperplasia is associated with increased stromal 5 alpha-reductase activity.