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Polyacrylamide gel electrophoresis analysis revealed that the vas deferens of adult mouse contains a major protein. Mouse vas deferens protein is a basic glycoprotein with a molecular weight of 34,800 +/- 300. The protein represents 17 +/- 0.7% and 42 +/- 2.4% of soluble proteins from homogenate and luminal fluid respectively, an estimate based on densitometric scanning of polyacrylamide gels. The protein originated from the vas deferens since it was not detected in blood plasma or in sexual organs and it was still present after ligation of the epididymis. Changes in androgen status of the animal markedly affected the vas deferens protein. After castration a progressive decrease in the protein was observed and its relative percentage dropped to 2 +/- 0.4% after 45 days. The concentration of the protein returned to precastration levels after 2 weeks of testosterone treatment but oestradiol, progesterone and corticosterone were ineffective in this respect. The vas deferens protein was not synthesized in significant amounts until animals were 20 days old and its concentration increased rapidly from 20 to 30 days in concert with the pubertal increase of androgens in the vas deferens.

Preliminary characterization, androgen-dependence and ontogeny of an abundant protein from mouse vas deferens