Presence of urokinase‐type plasminogen activator (u‐PA) in tissue extracts of antrochoanal polyp

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Abstract
Using a biochemical technique, the authors characterized and identified a plasminogen activator (PA) derived from tissue extracts of antrochoanal polyp (AP) and paranasal mucous membrane (PMM) with chronic sinusitis. The results of fibrin zymography indicated that the tissue extracts of AP revealed two lytic zones and that those of PMM revealed a single lytic zone on fibrin‐agarose plates. One of the AP zones exhibited the same relative mobility as the PMM zone (molecular weight: 65 kd), while the other AP zone had a smaller molecular weight (about 54 kd). Goat immunoglobulin G (IgG) fraction of antihuman uterine tissue‐type plasminogen activator (t‐PA) inhibited the 65‐kd lytic zones of AP and PMM. Anti‐human low‐molecular‐weight urokinase inhibited only the 54‐kd lytic zone of AP, and nonspecific goat IgG failed to inhibit any of the lytic zones. On the other hand, 10−2 mol trans 4‐(aminomethyl)cyclohexane‐carboxylic acid (t‐AMCHA) inhibited all of the lytic zones. No lytic zones could be observed on plasminogen‐free fibrin‐agarose plates. These findings confirmed that the tissue extracts of PMM contained t‐PA, and that those of AP contained both t‐PA and urokinase‐type plasminogen activator (u‐PA). In addition, it appeared that u‐PA in inflammatory tissue was related to proliferative changes of the mucous membrane.