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Gonadal dysfunction in the spontaneously diabetic BB rat.

F T Murray, D F Cameron, J M Orth

    Metabolism: Clinical and Experimental
    |July 1, 1983
    PubMed
    Summary
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    Spontaneous diabetes in BB Wistar rats reduces male fertility due to Leydig cell dysfunction, preceding testicular aging. This rat model may help study diabetic male impotence and infertility.

    Area of Science:

    • Reproductive Endocrinology
    • Diabetic Complications
    • Animal Models

    Background:

    • Diabetes mellitus spontaneously occurring in BB Wistar rats is linked to reduced fertility in males.
    • Leydig cell lipid accumulation and hormonal imbalances are observed early in diabetes.

    Purpose of the Study:

    • To investigate the impact of diabetes on male reproductive function in BB Wistar rats.
    • To explore the relationship between Leydig cell changes and seminiferous tubule alterations in diabetic rats.
    • To assess the potential of the BB rat as a model for human diabetic infertility.

    Main Methods:

    • Longitudinal study of BB Wistar rats with spontaneous diabetes.
    • Measurement of serum testosterone and luteinizing hormone (LH) levels.
    • Histopathological examination of testicular tissue, focusing on Leydig cells and seminiferous tubules.

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    Main Results:

    • Early diabetes showed reduced testosterone and transient LH decrease, with Leydig cell lipid accumulation.
    • Testosterone levels fluctuated, but high LH persisted, alongside significant seminiferous tubule damage (thickening, germ cell depletion, Sertoli cell vacuolization).
    • Testicular changes in diabetic rats resembled accelerated aging observed in aged control rats.

    Conclusions:

    • Leydig cell dysfunction appears to be a primary factor in BB rat infertility, preceding seminiferous tubule damage.
    • The BB rat model shows promise for studying the mechanisms of diabetic male infertility and impotence.
    • Diabetic-induced testicular changes in rats may mirror aspects of human diabetic reproductive dysfunction.