The secretory activity of seminal vesicles (SV) in the castrated hamster was studied by stereological analysis and biochemical approaches following treatment with cyproterone acetate (CPA) and adrenalectomy in order to investigate whether extra-testicular androgens are responsible for castration-resistant protein secretion. Treatment of castrated animals with CPA decreased the size of secretory granules and increased the number of apical granules, though neither the absolute nor the relative volume of all the components analysed was changed. In addition, CPA-treatment increased the amount of protein exocytosed by SV in castrated animals, though total protein synthesis remained unchanged. Adrenalectomy neither suppressed secretion nor induced any further ultrastructural changes in the SV epithelium. Our results demonstrate that secretory activity of the hamster SV following castration is not controlled by extra-testicular androgens and suggest that SV secretory proteins, which are heterogeneous with regard to their sensitivity to androgen withdrawal, might be regulated differentially by androgens.
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