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Free radicals inactivate human neutrophil elastase and its inhibitors with comparable efficiency
R T Dean1, H P Nick, H P Schnebli
1Ciba-Geigy, Basel, Switzerland.
Biochemical and Biophysical Research Communications
|March 15, 1989
Abstract:
Free radicals produced in a Fenton reaction (H202/Cu), modelling some xenobiotic and cell-mediated inflammatory affronts, efficiently inactivated the elastase-inhibitor eglin, but equally, human neutrophil elastase itself. Elastase activity was not regenerated from proteinase/inhibitor complexes during radical attack. Three different elastase inhibitors, eglin, secretory leukocyte proteinase inhibitor and alpha-1-proteinase inhibitor were all similarly sensitive to inactivation. Unlike certain oxidants which can selectively inactivate alpha-1-proteinase inhibitor, free radicals may influence comparably the availability of both proteinase inhibitors and their targets.