title: Oxidized alpha 1-proteinase inhibitor: a fast-acting inhibitor of human pancreatic elastase.
abstract: Unlike human neutrophil elastase or porcine and rat pancreatic elastases, human pancreatic elastase is rapidly inhibited by oxidized alpha 1-proteinase inhibitor. The second-order association-rate constant for the reaction of the oxidized inhibitor with this enzyme (kass = 10(5) M-1 s-1) is only 8-fold lower than that measured with native alpha 1-proteinase inhibitor. Elastase releases faster from its complex with the oxidized inhibitor (t1/2 approximately 0.7 days) than from its complex with the native inhibitor (t1/2 approximately 5 days). Oxidized alpha 1-proteinase inhibitor is as efficient as the native inhibitor in inhibiting the elastolytic activity of elastase. Oxidized alpha 1-proteinase inhibitor may thus be considered as a physiological inhibitor of human pancreatic elastase which may prevent degradation of blood vessel elastin during acute hemorrhagic pancreatis.
authors.affiliation: INSERM Unité 237, Université Louis Pasteur de Strasbourg, Illkirch, France.
authors.forename: M
authors.initials: M
authors.lastname: Padrines
authors.forename: M
authors.initials: M
authors.lastname: Rabaud
authors.forename: J G
authors.initials: JG
authors.lastname: Bieth
mesh_terms: D006801:Humans; D007700:Kinetics; D010084:Oxidation-Reduction; D010179:Pancreas / Q000201:enzymology*; D010196:Pancreatic Elastase / Q000037:antagonists & inhibitors* / Q000378:metabolism; D013379:Substrate Specificity; D000515:alpha 1-Antitrypsin / Q000378:metabolism*
chemical_list: D000515:alpha 1-Antitrypsin; D010196:Pancreatic Elastase