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ANDROGEN-BINDING PROTEIN IN EFFERENT DUCT FLUID OF RAT TESTIS

Testicular fluid obtained from the rete testis and vasa efferentia has been reported to contain testosterone in concentrations approaching the amount in spermatic venous blood (Voglmayr, Waites & Setchell, 1966; White & Hudson, 1968). Flow rates, which have been established in several mammalian species (Setchell, 1970; Tuck, Setchell, Waites & Young, 1970) would indicate that the exocrine secretion may deliver a substantial quantity of androgen to the caput epididymidis. Testosterone and possibly other androgens in rete testis fluid might also exert a direct influence on spermatozoa as they are transported in this fluid.

In the present report, a specific androgen-binding protein with high affinity for dihydrotestosterone (DHT) and testosterone (T) is demonstrated in rete testis and efferent duct fluid from the rat testis. Fluid