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Stimulatory effect of follicle-stimulating hormone on rat Leydig cells

A morphometric and ultrastructural study

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Summary

The effects of FSH on the testicular interstitial tissue of immature hypophysectomized rats were studied by comparing morphological changes in Leydig cells with quantitative changes in interstitial tissue histology using morphometric analysis. Three groups of rats received subcutaneous injections of 0.5 ml saline vehicle or 10 μg rFSH or 20 ng oLH (equivalent to the amount of LH known to contaminate the FSH), twice daily for 7 days. Administration of FSH significantly increased testis weight and stimulated more advanced spermatogenesis compared to saline or LH. Morphometric analysis of testes of LH-treated rats showed a small but significant increase in total interstitial cell volume compared to saline treatment. FSH caused much greater increases in the total volume of interstitial tissue and interstitial cells than either saline or LH and significantly increased the total volume of interstitial fluid by comparison with the other groups. FSH but not saline or LH treatment resulted in a striking hypertrophy of Leydig cells, to produce cells ultrastructurally identical to Leydig cells from adults. Since the target tissue of FSH is the seminiferous epithelium, the observed effects on Leydig cells by FSH treatment suggest that the secretion of factors by the seminiferous tubules may mediate the maturation of Leydig cells.

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  1. MRC Reproductive Biology Unit, Centre for Reproductive Biology, Edinburgh, UK

    J. B. Kerr & R. M. Sharpe

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  1. J. B. Kerr
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  2. R. M. Sharpe
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Kerr, J.B., Sharpe, R.M. Stimulatory effect of follicle-stimulating hormone on rat Leydig cells. Cell Tissue Res. 239, 405–415 (1985). https://doi.org/10.1007/BF00218021

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