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Androgenic control of biochemical parameters in the epididymis of mature rats was studied by comparing efferent duct ligation with castration. Castration is followed by epdidymal regression. Tissue from castrated rats had a greater dry weight a lower proportion of soluble protein and lower amounts of phospholipid RNA and acid-soluble phosphorus. These changes were in line with reduced sythetic activity. The concentration of epididymal DNA increased after castration. Total DNA in the tissue fell by only 25% indicating cytoplasmic shrinkage rather than reduced cell numbers. The concentrations of total lipid and glycogen were uninfluenced by the androgen status. Total sialic acid was little changed by castration although an increase was found in the caput epididymidis. However castration did result in a decline in acid-soluble sialic acid. This study indicates that the androgen-deprived epididymis is an involuted organ which probably has a markedly reduced synthetic activity.

The androgenic control of the composition of the rat epididymis determined by efferent duct ligation or castration