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Summary. Proteolytic activity, acid phosphatase activity and fructose concentration were measured in seminal plasma from 205 human semen samples. Certain routine sperm characteristics were also determined. High fibrinolytic activity was found and TAME-esterase and proteinase activity was also present in all specimens. The activity of all the proteo- lytic enzymes correlated positively with the acid phosphatase activity suggesting the prostate gland to be the origin of the enzymes. TAME\x=req-\ esterase activity was inversely related to the seminal fructose content. No correlation was observed between sperm characteristics and the seminal proteolytic enzymes. The specimens with abnormal viscosity usually contained low proteinase activity. Human seminal plasma is known to possess considerable proteolytic activity; two protein-splitting enzymes have been found, one active at an acid pH and the other having similarities to chymotrypsin (Lundquist, Thorsteinsson & Buus, 1955), Several investigators have demonstrated the presence of plasmino- gen activator(s) in seminal plasma (Lundquist et al. 1955; Rasmussen & Albrechtsen, 1960; Hisazumi, 1970). Lundquist et al. (1955) also discovered an enzyme system in human seminal plasma, which hydrolyses arginine esters. Suominen & Niemi (1970) have shown that this activity represents that of several different enzymes, e.g. the plasminogen activators. The function of these pro¬ teolytic enzymes is usually thought to be concerned with the liquefaction of the semen coagulum after ejaculation. The purpose of the present study was to measure the total activity of protein¬ ase, arginine-esterases and fibrinolytic enzymes in human seminal plasma, and to find out whether there is any correlation between these activities and certain parameters of accessory sex gland function (e.g. the activity of acid phosphatase for the prostate gland and the fructose content for the seminal vesicles) or other semen characteristics. Semen samples were obtained from 205 patients who were being examined for infertility or for suspected disease of the accessory genital organs. The semen volume and viscosity, and the sperm density, motility, viability and morphology were analysed as described by Eliasson (1971). The following

THE RELATION OF THE PROTEOLYTIC ACTIVITY OF HUMAN SEMINAL PLASMA TO VARIOUS SEMEN CHARACTERISTICS