Modification of shear modulus and creep compliance of fibrin clots by fibronectin.
Shear moduli and creep compliances have been measured for four types of clots of human fibrin (about 7 mg/ml) clotted with and without human plasma fibronectin (usually 1.2 mg/ml). Fine clots (with little lateral aggregation of the fibrin protofibrils) were found at pH 8.5, ionic strength 0.45; coarse clots (with substantial lateral aggregation) were formed at pH 7.5, ionic strength 0.15; in both cases with and without ligation by fibrinoligase. In fine clots, the addition of fibronectin without ligation scarcely affected the shear modulus; with ligation, the modulus was decreased by a factor of 0.48. In coarse clots, the shear modulus was increased by addition of fibronectin. The increase was by a factor of 2.0 without ligation and by a factor of 2.4 with ligation. Creep and creep recovery in clots formed with and without fibronectin were similar except for the scale factor represented by the change in modulus.
D000818:Animals; D002417:Cattle; D005337:Fibrin / Q000502:physiology; D005340:Fibrinogen / Q000502:physiology; D005353:Fibronectins; D011485:Protein Binding; D011487:Protein Conformation; D011516:Prothrombin / Q000502:physiology
D005353:Fibronectins; D011516:Prothrombin; D005337:Fibrin; D005340:Fibrinogen