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Morphological pattern elicited by agents affecting spermatogenesis by stimulation.

L D Russell, J P Malone, S L Karpas

    Tissue & Cell
    |January 1, 1981
    PubMed
    Summary
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    Agents disrupting testicular hormone stimulation cause identical early morphologic changes in rats. This consistent pattern of increased Stage VII degenerating cells aids in predicting the mechanism of action for endocrine-disrupting chemicals.

    Area of Science:

    • Endocrinology
    • Reproductive Biology
    • Toxicology

    Background:

    • Hormonal regulation of the testis is crucial for spermatogenesis.
    • Various agents can disrupt normal testicular function.
    • Understanding early cellular changes is key to identifying mechanisms of disruption.

    Purpose of the Study:

    • To identify early morphological changes in rat testes induced by agents disrupting hormonal stimulation.
    • To correlate these changes with specific spermatogenic stages.
    • To establish a predictive pattern for agents interfering with testicular hormone action.

    Main Methods:

    • Rats were administered various agents (e.g., clomiphene citrate, estradiol 17-beta) or vehicle.
    • Dose and sacrifice intervals were optimized through initial trials.

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  • Morphological abnormalities in testes were quantitatively assessed and linked to spermatogenic stages.

    • Main Results:

    • All tested agents induced a significant increase in Stage VII degenerating cells (pachytene spermatocytes, step 7 and step 19 spermatids).
    • No significant changes were observed in degenerating cells in other spermatogenic stages.
    • The observed pattern of Stage VII degeneration was consistent across different disruptive agents.

    Conclusions:

    • Disruption of testicular hormonal stimulation, regardless of the agent or level, results in a uniform morphological response.
    • The specific increase in Stage VII degenerating cells serves as a reliable indicator for predicting the mechanism of action of agents affecting hormone pathways.