Abstract
Previous studies have demonstrated that neutrophils possess an active serine protease(s) which may be involved in the process of chemotaxis but the precise identity of this enzyme(s) remains to be determined. In this study fourteen different protease inhibitors were tested over a wide concentration range for their ability to inhibit unstimulated neutrophil movement and chemotaxis to C5a, fMLP and IL-8. Pretreatment of neutrophils with aspartyl or metallo-protease inhibitors had no effect on either chemotaxis or random cell movement. The thiol protease inhibitors E-64 and cystatin, as well as the thiol/serine inhibitors antipain and leupeptin, diminished only C5a-induced chemotaxis. Pretreatment of neutrophils with the serine protease inhibitors PMSF or 3,4-DCI significantly reduced chemotaxis to C5a, fMLP and IL-8. The inhibitor of trypsin-like serine proteases, TLCK, and the neutrophil elastase inhibitor MeO-Suc-AAPV-CMK had no inhibitory effect on cell movement. However, two different inhibitors of chymotrypsin-like serine proteases, TPCK and chymostatin, significantly inhibited movement to any chemoattractant. These results suggest that an active chymotrypsin-like serine protease is essential for neutrophils to respond to chemotactic stimuli.
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Barna, J.B., Kew, R.R. Inhibition of neutrophil chemotaxis by protease inhibitors. Differential effect of inhibitors of serine and thiol proteases. Inflammation 19, 561–574 (1995). https://doi.org/10.1007/BF01539136
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DOI: https://doi.org/10.1007/BF01539136