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Crosslinked high molecular weight derivatives of fibrin (fibrinoligomers) were observed during intravascular coagulation. It was the purpose of this study to investigate the complex formation of fibrin oligomers with fibrinogen and fibrinmonomer. Fibrinogen coupled to agarose (Fg-ag) as well as fi-brinmonomer coupled to agarose (Fm-ag) was used as substrate. Soluble oligomers of fibrin were produced by incubating fibrinogen with thrombin, calcium-chloride, cystein and F XIII. They were separated from fibrinogen by gel filtration. Γ-dimers were demonstrated in fractions from the void volume and the shoulder prior to the fibrinogen peak. These fractions were subjected to affinity chromatography. Crosslinked oligomers of fibrin were not adsorbed on Fg-ag, yet adsorption occured on Fm-ag. This indicates that fibrin oligomers have no affinity to fibrinogen, yet readily form complexes with fibrin. This could mean that in vivo they compete with fibrinogen for the fibrinmonomer part of soluble fibrin monomer complexes, and hence have a tendency to increase in size.

Complex Formation of Covalently Crosslinked Fibrin Oligomers with Agarose Coupled Fibrinogen and Fibrin