A colorimetric assay for releasable plasminogen activator.
نویسندگان
چکیده
We describe an equilibrium assay for measuring release of plasminogen activator form blood-vessel walls and report data from 125 individuals free of overt thromboembolic disease. Excess human plasminogen is added to the euglobulin fraction of plasma obtained before and after venous occlusion at mean systolic pressure. To measure plasmin generation in these samples, we used the chromogenic plasmin substrate D-Val-Leu-Lys-p-nitroanilide, which liberates p-nitroaniline upon cleavage. Releasable plasminogen activator in 24 subjects was determined by this colorimetric assay and by the radiocasein assay previously reported by this laboratory (Am. J. Clin. Pathol. 76,403-409, 1981), and the results were compared. The correlation coefficient was 0.97. The colorimetric assay offers several advantages over the radiocasein assay: shorter incubation (6 vs 16 h) and no preparation or quantification of a radioactive substrate and its cleavage products.
منابع مشابه
Optimizing refolding condition for recombinant tissue plasminogen activator
Low molecular size additives such as L-arginine and the redox compounds have been used both in the culturemedium and in vitro refolding to increase recombinant proteins production. Additives increase proteinrefolding and yield of active proteins by suppressing aggregate formation or enhancing refolding process.In this work, a comparative study was performed on refolding of rec...
متن کاملAn Ultra-Sensitive Immunoassay for Quantifying Biomarkers in Breast Tumor Tissue
Urokinase-type plasminogen activator (uPA) and plasminogen activator inhibitor type-1 (PAI-1) have been validated at the highest level of evidence as clinical biomarkers of prognosis in breast cancer. The American Society of Clinical Oncology recommends using uPA and PAI-1 levels in breast tumors for deciding whether patients with newly diagnosed node-negative breast cancer can forgo adjuvant c...
متن کاملContribution of Streptokinase-Domains from Groups G and A (SK2a) Streptococci in Amidolytic/Proteolytic Activities and Fibrin-Dependent Plasminogen Activation: A Domain-Exchange Study
Background: Streptokinase (SK), a heterogeneous plasminogen (PG) activator (PA) protein from groups A, C, and G streptococci (GAS, GCS, GGS, respectively) contains three structural domains (SKα, SKβ, and SKg). Based on the variable region of SKβ, GAS-SKs (ska) are clustered as SK1 and SK2 (including SK2a/SK2b), which show low and high fibrinogen (FG)-dependent PG activation properties, respecti...
متن کاملA clinical study investigating the three months prognosis of patients with ischemic stroke treated with recombinant tissue plasminogen activator (rt-PA) and its effective factors
Objective: Currently, treating ischemic stroke by intravenous thrombolytic therapy has acceptable results in patients with stroke. This study aimed to evaluate the three months prognosis of patients treated with recombinant tissue plasminogen activator (rt-PA).Methods: This cross-sectional prospective study was conducted on 30 patients with cerebral ischemic stroke with the National Insti...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Clinical chemistry
دوره 28 5 شماره
صفحات -
تاریخ انتشار 1982