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Decrease in luteinizing hormone biological activity/immunoreactivity ratio in elderly men.

P Marrama, V Montanini, M F Celani

    Maturitas
    |April 1, 1984
    PubMed
    Summary
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    Elderly men exhibit increased luteinizing hormone (LH) levels but reduced testosterone and LH bioactivity. This suggests the aging pituitary may release less potent LH molecules.

    Area of Science:

    • Endocrinology
    • Aging Research
    • Reproductive Biology

    Background:

    • Luteinizing hormone (LH) plays a crucial role in male reproductive function.
    • Age-related changes in the endocrine system, particularly LH and testosterone levels, are not fully understood.

    Purpose of the Study:

    • To investigate basal serum concentrations of biologically active LH (BIO-LH), immunoreactive LH (RIA-LH), and testosterone (T) in healthy elderly men compared to young men.
    • To assess the LH bioactivity/immunoreactivity (B/I) ratio in relation to aging.

    Main Methods:

    • Serum samples from 57 healthy elderly men (60-94 yr) and 53 healthy young men (18-49 yr) were analyzed.
    • LH biological activity was determined using an in vitro bioassay measuring testosterone production by mouse Leydig cells.

    Related Experiment Videos

  • Immunoreactive LH and testosterone levels were also quantified.

    • Main Results:

    • Elderly men showed significantly higher mean BIO-LH (2-fold) and RIA-LH (3-fold) concentrations compared to young men (P < 0.001).
    • Conversely, elderly men had significantly lower mean LH B/I ratios (-22%) and testosterone levels (-43%) (P < 0.001).

    Conclusions:

    • Aging is associated with increased serum LH levels but decreased testosterone and impaired LH bioactivity relative to immunoreactivity.
    • The aging pituitary may secrete LH molecules with reduced biological potency, potentially contributing to age-related endocrine changes in men.