Abstract
The secretion of inhibin by the testis into the circulation was studied by measuring immunoreactive inhibin concentrations in spermatic vein blood samples drawn at 15 min intervals for 4 h. Mean spermatic vein inhibin levels were four times the levels in peripheral blood whereas spermatic vein testosterone (T) levels were 60-fold increased. Inhibin was released in well-defined pulses which coincided with episodes ot T release; both the duration and relative amplitude of inhibin and T pulses were similar. Inhibin pulses were undetectable in peripheral blood. These data suggest that the mechanism responsible for releasing T from the testis also stimulates inhibin release. This mechanism appears to involve LH and Leydig cells.
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