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Effect of nafamostat mesilate (FUT-175), a serine protease inhibitor, having anti-inflammatory effects was studied on superoxide (O2-) production in rat polymorphonuclear leucocytes (PMN) and compared with those of other serine protease inhibitors and typical anti-inflammatory agents. 1) O2- productions in rat PMN stimulated with concanavalin A (Con A) and cytochalasin B (Cyt B) were too weak to observe. With NADH, however, strong O2- production was induced by Con A and Cyt B. 2) FUT-175 at 10(-6) and 10(-5) M inhibited O2- production in rat PMN induced by Con A and Cyt B with NADH in a concentration-dependent manner. 3) The serine protease inhibitor L-tosylamido-2-phenylethyl-chloromethyl ketone (TPCK) and soybean trypsin inhibitor (SBTI) inhibited O2- production at 10(-5) M and 10(-4) M, respectively, while aprotinin, chymostatin and leupeptin did not. 4) Neither indomethacin nor dexamethasone, typical anti-inflammatory agents, inhibited O2- production. Mepacrine, a phospholipase A2 inhibitor, strongly inhibited it. 5) O2- production in PMN prepared from the rat administered FUT-175, 200 mg/kg, p.o., was significantly decreased in comparison with that of the control rat. 6) FUT-175 had no effect on O2- production by hypoxanthine-xanthine oxidase. These results showed FUT-175 had a strong inhibitory effect on O2- production in rat PMN which other typical anti-inflammatory agents did not have.

Inhibitory effect of nafamostat mesilate (FUT-175) on O2- production in rat polymorphonuclear leucocytes.