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The effects of a single administration of ethane dimethane sulphonate (EDS), which has a direct cytotoxic effect on Leydig cells, was assessed for its spermatogenic damage and intratubular androgen level in SD male adult rats. The protective effect of human chorionic gonadotropins (hCG) (s.c.), testosterone propionate (TP) (s.c.) and intratesticular administration of testosterone microcrystal suspension (Tmcs) against the spermatogenic damage in rats EDS given was also evaluated. EDS caused a decrease of the seminiferous tubular diameter and impaired spermatogenesis remarkably; moreover, it also caused significant decreases in intratubular androgen levels. These results suggest that EDS-treated SD male adult rats may be suitable as a model for hormone dependent infertility. The administration of hCG and intratesticular Tmcs prevented tubular damage and increased the intratubular T level. On the other hand, the administration of TP prevented tubular damage while remarkably decreasing intratubular androgen level. In this connection, it was inferred that priming of rats with TP caused an increase in intratubular androgen binding protein, which would stimulate spermatogenesis. The fact that a single injection of Tmcs caused no tubular damage suggests that intratubular T level is one of the factors playing an important role in spermatogenesis and that an intratesticular injection of Tmcs may be useful for the treatment of some cases of idiopathic male infertility.

STUDY ON ETHANE DIMETHANE SULPHONATE (EDS)-INDUCED SPERMATOGENIC DAMAGE AND PROTECTIVE DRUGS AGAINST THIS DAMAGE IN THE RAT