title: CA-1 method, a novel assay for quantification of normal prothrombin using a Ca2+ -dependent prothrombin activator, carinactivase-1.
abstract: We established a novel prothrombin assay, designated CA-1 method, for quantification of normal prothrombin in application of a Ca2+ -dependent prothrombin activator, carinactivase-1 (CA-1), found in the venom of Echis carinatus leucogaster. On microplate, thrombin converted from normal prothrombin in plasma sample by CA-1 cleaves a thrombin specific chromogenic substrate, t-butoxy-Val-Pro-Arg-p-nitroanilide and liberates p-nitroaniline. Then, the normal prothrombin level is decided by measuring the velocity of p-nitroaniline liberation. Normal prothrombin levels in plasma from warfarin-treated individuals were highly correlated with coagulant activities assayed by both prothrombin time and thrombotest. CA-1 method is not only a rapid and highly sensitive chromogenic microplate assay for quantification of normal prothrombin in the range of 10-200 ng/100 microl in plasma samples but also suitable for analyses of many samples in a short time. In addition, normal prothrombin levels obtained by CA-1 method are not inhibited by EDTA and heparin, which reduce prothrombin time and thrombotest activities. CA-1 method is a novel assay for monitoring coagulant activity in warfarin-treated individuals.
authors.affiliation: Department of Biochemistry, Meiji Pharmaceutical University, Kiyose, Tokyo, Japan.
authors.forename: D
authors.initials: D
authors.lastname: Yamada
authors.forename: T
authors.initials: T
authors.lastname: Morita
mesh_terms: D000814:Aniline Compounds; D001681:Biological Assay / Q000379:methods*; D002118:Calcium; D002863:Chromogenic Compounds; D005343:Fibrinolytic Agents; D006801:Humans; D008666:Metalloendopeptidases; D011516:Prothrombin / Q000032:analysis*; D012680:Sensitivity and Specificity
chemical_list: D000814:Aniline Compounds; D002863:Chromogenic Compounds; D005343:Fibrinolytic Agents; C008625:nitroaniline; D011516:Prothrombin; D008666:Metalloendopeptidases; C098667:carinactivase; D002118:Calcium