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. 1980 Jan;65(1):74–81. doi: 10.1172/JCI109662

Evidence that proteases are involved in superoxide production by human polymorphonuclear leukocytes and monocytes.

S Kitagawa, F Takaku, S Sakamoto
PMCID: PMC371341  PMID: 6243143

Abstract

The possible participation of proteases in superoxide (O2-) production by human polymorphonuclear leukocytes (PMN) and monocytes was explores using various protease inhibitors and substrates. Protease inhibitors of serine proteases and synthetic inhibitors that modify the active site of serine proteases. Substrates used were synthetic substrates of the chymotrypsin type as well as trypsin type of protease. All these inhibitors and substrates inhibited O2- oroduction by human PMN and monocytes induced by cytochalasin E and concanavalin A, though PMN were more sensitive to these inhibitors and substrates than monocytes. Inhibition appeared rapidly even when the inhibitors were added at the same time as the stimulants, during the "induction time of O2-production" or at the time of maximum O2- production, whereas much greater inhibition was observed when the cells were preincubated with the inhibitors. These observations suggest that enzymatically active serine proteases are essential for these phagocytic cells to initiate and maintain the O2- production in response to the stimuli. The inhibitory effect of the inhibitor and substrate for chymotrypsin type protease was greater than that of those substances for trypsin-type protease. Macromolecular inhibitors also inhibited the O2- production. These findings suggest that the serine proteases involved in the O2- production by human PMN and monocytes are similar to chymotrypsin rather than trypsin, and are possibly located at the cell surface membrane.

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Selected References

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