Lactate dehydrogenase (LD, EC 1.1.1.27) activity was determined in serum, seminal plasma and prostasomes from normozoospermic and azoospermic (due to vasectomy) men. A 10-fold higher activity was noted in seminal plasma as compared with serum. LD activity was enriched in prostasomes although a fairly large amount of enzyme activity seemed to be free in solution. Isoenzymes LD1, LD2 and LD3, present in prostasomes in about equal amounts, gave rise to a characteristic isoenzyme pattern that differed distinctly from that found in seminal plasma of normozoospermic men, the main isoenzyme of which was LD-X.

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