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Origin of regenerating Leydig cells in the testis of the adult rat

An ultrastructural, morphometric and hormonal assay study

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Summary

Ethane dimethanesulphonate (EDS) was used as a specific cytotoxin to eliminate the Leydig cell population of the adult rat testis. Ultrastructural, morphometric and serum gonadotrophin and testosterone analysis was used to study the response of the intertubular tissue of the testis from 1 day to 10 weeks after EDS treatment. In control animals, the testis contained approximately 28 million Leydig cells and 8 million macrophages. Three to seven days after EDS treatment, Leydig cells were absent and serum testosterone was undetectable. Macrophage numbers increased three-fold by 3 days and returned to pretreatment values thereafter. At 2 and 3 weeks post-EDS, foetal-type Leydig cells (∼1–2 million per testis) appeared in proximity to perivascular and peritubular tissues, a feature also observed at 4 weeks when numerous such cells (∼15 million per testis) formed prominent clusters in perivascular and peritubular locations. Between 6 and 10 weeks after EDS treatment, the foetal-type Leydig cells were transformed morphologically into adult-type Leydig cells, they occupied central intertubular positions and their numbers were restored to pretreatment values. Regeneration of Leydig cells was reflected by elevated serum testosterone levels which returned towards the normal range. The results demonstrate the regenerative capacity of the testicular intertubular tissue and indicate a dual site of origin of Leydig cells which initially resemble foetal-type Leydig cells prior to establishing the adult-type Leydig cell population. The morphological pattern of Leydig cell regeneration suggests that in addition to gonadotrophic stimulation, local testicular factors from the seminiferous tubules may stimulate Leydig cell growth.

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Authors and Affiliations

  1. M. R. C. Reproductive Biology Unit, Scotland

    J. B. Kerr, J. M. S. Bartlett & R. M. Sharpe

  2. Department of Obstetrics and Gynaecology, Centre for Reproductive Biology, Edinburgh, Scotland

    K. Donachie

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  1. J. B. Kerr
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  2. J. M. S. Bartlett
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  3. K. Donachie
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  4. R. M. Sharpe
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Kerr, J.B., Bartlett, J.M.S., Donachie, K. et al. Origin of regenerating Leydig cells in the testis of the adult rat. Cell Tissue Res. 249, 367–377 (1987). https://doi.org/10.1007/BF00215521

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  • DOI: https://doi.org/10.1007/BF00215521

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