Abstract
The human testis and epididymis contain two distinct androgen binding components, one with physicochemical properties identical to the androgen receptor found in other target tissues and another, androgen binding protein (ABP), which shares the same binding characteristics as human testosterone binding globulin (TeBG). Simultaneous assays of ABP and corticosteroid binding globulin (CBG, an exclusive blood protein) in the same testicular extracts suggest that androgen binding to the second component could be readily explained by contamination with blood TeBG rather than by the existence of a testis specific ABP. The levels of dihydrotestosterone (DHT) (the major androgen binding to this protein) in the human epididymis are much lower than those reported for rats and rabbits. Furthermore, there is no concentration gradient in DHT or testosterone along the human epididymis.
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