Abstract
The growth and function of the epididymis are regulated by testosterone produced by Leydig cells in the testes. In the present study it was observed that neutralization of endogenous follicle stimulating hormone (FSH) in immature rats using a highly specific antiserum to ovine FSH resulted in changes in the histology of the epididymis along with a decrease (50–60%) in its weight compared with the normal serum-treated controls. These changes were observed in both rat and monkey epididymis without any decrease in serum testosterone, on which epididymis is known to be dependent. A detailed study was therefore carried out on the effects of deprivation of FSH or testosterone on the histology of epididymis. The changes in epididymal histology following FSH deprivation included a decrease in the size of the tubule lumen in the rat as well as in the adult male bonnet monkey in which the antiserum against ovine FSH was raised. Intensive vacuolization and uneven surface of the luminal epithelium was also observed. In contrast, the effect of deprivation of testosterone support by way of administration of LH antiserum or flutamide resulted in a decrease in the size of the lumen and degenerative changes. These results suggest that cauda epididymidis is a target for FSH action.
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