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Seminal acid phosphatase from normal, oligospermic, vasectomized, and azoospermic men.


 The activity of seminal acid phosphatase was determined in both normal and abnormal human semen samples and the enzyme activity was correlated with total protein content of seminal fluid. Fresh human semen samples were collected from 88 subjects, aged 25-40, after 7 days of abstinence, by masturbation. Semen samples were grouped into 4 according to sperm count: 1) count above 40 million/ml and normal morphology; 2) count below 40 million/ml with normal morphology (oligospermic); 3) azoospermic (sperm absent); and 4) vasectomized males. Acid phosphatase was measured colorimetrically, and protein was assayed by the method of Lowry et al. Despite similar ejaculate volumes in both Groups 1 and 2, the percentage motility of sperm from oligospermic men (Group 2) was significantly less (P=.05). The protein content was found to be highest in oligospermic males, but not significantly higher (P.05). The normal, oligospermic, vasectomized, and azoospermic samples showed a decreasing order of acid phosphatase activity, and a significant difference of activity (P.05) was exhibited only when normal and azoospermic samples were compared. An inverse relationship between acid phosphatase activity and total protein content was found. The normal semen samples with high protein concentrations were found to possess low acid phosphatase activity and samples having low protein content showed approximately 3 times higher acid phosphatase activity. Statistical analysis has shown these are highly significant relationships (P.001 in each case).
