alpha-chymotrypsin and carbobenzyloxyleucyl-tyrosine-chloromethyl-ketone

The effects of carbobenzyloxy-leucine-tyrosine-chloromethylketone (zLYCK), an inhibitor of chymotrypsin, were investigated on the activation pathways of the human neutrophil respiratory burst. At 10 microM zLYCK, a parallel inhibition was observed of superoxide production stimulated with the chemo-attractant FMLP and of chymotrypsin-like activity of human neutrophils. By contrast, superoxide production induced by PMA was minimally affected by zLYCK. The known transduction pathways triggered by FMLP were analyzed. zLYCK did not affect either the FMLP-induced cytosolic free calcium transient, inositol 1,4,5 trisphosphate formation, nor the PMA-induced phosphorylation of the 47-kDa substrate of protein kinase C. zLYCK did not affect the activity of protein kinase C extracted from neutrophils. In Ca(2+)-depleted cells, in which phosphatidylinositol 4,5-biphosphate breakdown does not occur, zLYCK inhibited the FMLP-induced respiratory burst in cells primed by low doses of PMA. The activity of the NADPH oxidase tested with active membranes from stimulated neutrophils or in a cell-free system was not inhibited by zLYCK. We conclude that: 1) zLYCK inhibits superoxide production through the inhibition of a chymotrypsin-like protease of the neutrophil, 2) zLYCK inhibits FMLP-induced activation of NADPH oxidase through a pathway independent of PtdInsP2 breakdown and cytosolic free calcium, and 3) zLYCK may prove a useful probe for the characterization of its target protease in neutrophil activation.

Topics: Amino Acid Chloromethyl Ketones; Calcium; Chymotrypsin; Cytoplasm; Dose-Response Relationship, Drug; Enzyme Activation; Humans; In Vitro Techniques; Inositol 1,4,5-Trisphosphate; NADH, NADPH Oxidoreductases; NADPH Oxidases; Neutrophils; Phagocytosis; Phosphatidylinositol 4,5-Diphosphate; Phosphatidylinositols; Superoxides; Time Factors; Tyrosine

The effects of carbobenzyloxy-leucine-tyrosine-chloromethylketone (zLYCK), an inhibitor of chymotrypsin-like proteases, on signal transduction in human neutrophils triggered by the chemoattractant formyl-methionyl-leucyl-phenylalanine (fMLP) were investigated. zLYCK (10 microM) inhibited the fMLP-induced respiratory burst in neutrophils treated with cytochalasin B. In the presence of zLYCK (10 microM), the activation of phospholipase D in response to fMLP addition was inhibited. zLYCK did not inhibit the binding of [3H] fMLP to its receptor or the enzymic activity of phospholipase D because the response to ionomycin was unaffected. The effect of zLYCK on phospholipase D correlated well with its effects on the accumulation of diglycerides, which was also inhibited in the presence of zLYCK. In electropermeabilized neutrophils, too, zLYCK caused an inhibition of the fMLP-induced respiratory burst and the fMLP-induced activation of phospholipase D. Interestingly, this inhibition could be bypassed by guanosine 5'-O-(thiotriphosphate). We conclude that the inhibition of the respiratory burst in human neutrophils by zLYCK is caused by the selective inhibition of signal transduction leading to activation of phospholipase D and that zLYCK might be a useful probe to study the role of phospholipase D in neutrophil activation.

Topics: Amino Acid Chloromethyl Ketones; Chymotrypsin; Diglycerides; Enzyme Activation; Glycerophospholipids; Humans; N-Formylmethionine Leucyl-Phenylalanine; Neutrophils; Oxygen; Phosphatidic Acids; Phospholipase D; Signal Transduction