MODULATION OF CELL PROLIFERATION ON FIBRIN 1803 from the peptide and DNA Sequence

Fibrin forms the cohesive network of hemostatic plugs and thrombi, and it also provides the temporary matrix for initial support of healing and revascularization. Because cell proliferation is needed for revascularization after vessel injury, we have characterized structural requirements of fibrin needed to support cell proliferation on fibrin in vitro. Proliferation of cultured human endothelial cells and fibroblasts was measured by 3H-thymidine incorporation on fibrin surfaces varying in structure. Fibrin prepared with thrombin and lacking both fibrinopeptides A and B (desAB fibrin) supported proliferation of both endothelial cells and fibroblasts. In contrast, fibrin prepared with reptilase, which cleaves only fibrinopeptide A, supported significantly less proliferation. Also, fibrin prepared by thrombin treatment of fibrinogen lacking residuespl-42 supported only a low level of prolifer-

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