Haemostatic factors in human aortic intima
Abstract
Accumulation of lipid in developing fibrous atherosclerotic plaques is associated with high concentrations of fibrin and accumulation of a tightly bound lipoprotein fraction that can be released by incubation with fibrinolytic enzymes, suggesting that fibrin may play a key role in lesion development. It is not known whether this fibrin represents incorporated mural thrombus or is produced in situ by clotting of the fibrinogen that is present in intima in high concentration. Immunoelectrophoresis was used to measure the concentrations of fibrinogen and components of the clotting system in human aortic intima and lesions, and in mural thrombi. In the lipid and fibrin rich plaque centres prothrombin concentration was almost twice that in normal intima, but concentrations of the thrombin inhibitors antithrombin III and alpha 2-macroglobulin fell, so that the molar ratios of inhibitor/prothrombin fell from 3:1 in normal intima to 1:1 in the plaque centre. In mural thrombi there was preferential sequestration of fibrinogen-like antigen and prothrombin. Distribution of factor-VIII-related antigen was highly unpredictable; in both normal intima and all types of intimal lesion substantial amounts were recovered from some samples, wherea...Continue Reading
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