A Monoclonal Antibody-Based Qunatitative Enzyme Immunoassay for the Determination of Plasma Fibrinogen Concentartions
- 1 December 1988
- journal article
- research article
- Published by Georg Thieme Verlag KG in Thrombosis and Haemostasis
- Vol. 60 (03), 415-418
- https://doi.org/10.1055/s-0038-1646982
Abstract
The most commonly used fibrinogen assays in the clinic are clotting rate assays, e.g. the Clauss method. Such functional assays may be disturbed by e.g. heparin, anticoagulant fibrinogen degradation products (FgDP) and in the case of a dysfi-brinogenemia. Immunological methods would not suffer from these interferences. However, immunological assays for fibrinogen, which do not measure FgDPs, do not exist. To set up such an enzyme immunoassay (EIA) we developed two monoclonal antibodies. The first monoclonal antibody (G8) has its epitope in the carboxyl-terminal 150 amino acid stretches of the fibrinogen Aa-chains. G8 is used to coat the wells of microtitration plates, and is the capture antibody in this EIA. The second antibody (Y18) has been described by us previously (Blood 1985; 66: 503). It is directed against fibrinopeptide A, covalently bound to the ±-chains i.e. against the amino-terminal stretches of the A±-chains. Y18 is conjugated with horse-radish peroxidase, and used as tagging antibody. The EIA does not react with, and is not interfered by FgDP such as purified fragments X and Y, up to a concentration of 800 μg/ml. An FgDP mixture such as generated by Streptokinase treatment of plasma does not respond. Fibrin degradation products (whole blood lysate) up to 800 μg/ml do not interfere nor do heparin, EDTA or oxalate. The time-to-result of the EIA is only 45 minutes. Some patient plasmas yielded dose-response curves which are not parallel with the calibration curve of the EIA. An explanation for this phenomenon could not be given. Our fibrinogen EIA may be especially suitable to monitor patients with conditions which favour proteolytic damage to fibrinogen such as thrombolytic therapies.Keywords
This publication has 24 references indexed in Scilit:
- GENETIC AND CULTURAL INHERITANCE OF PLASMA FIBRINOGEN CONCENTRATIONThe Lancet, 1987
- HAEMOSTATIC FUNCTION AND ISCHAEMIC HEART DISEASE: PRINCIPAL RESULTS OF THE NORTHWICK PARK HEART STUDYThe Lancet, 1986
- Haemostatic function in myocardial infarction.Heart, 1986
- Purification and characterization of 3 fibrinogens with different molecular weights obtained from normal human plasmaThrombosis Research, 1985
- Fibrinogen as a Risk Factor for Stroke and Myocardial InfarctionNew England Journal of Medicine, 1984
- Quantitation of the three normally occurring plasma fibrinogens in health and during socalled “acute phase” by SDS electro-phoresis of fibrin obtained from EDTA-plasmaThrombosis Research, 1984
- Isolation of size homogeneous preparations of high molecular weight and low molecular weight fibrinogensCanadian Journal of Biochemistry, 1981
- HÆMOSTATIC FUNCTION AND CARDIOVASCULAR DEATH: EARLY RESULTS OF A PROSPECTIVE STUDYThe Lancet, 1980
- Relation between extent of coronary artery disease and blood viscosity.BMJ, 1980
- Quantitative Determination of Fibrinogen in plasma Gram's method modifiedScandinavian Journal of Clinical and Laboratory Investigation, 1957