Characterization of Endothelial Cell Differential Attachment to Fibrin and Fibrinogen and Its Inhibition by Arg-Gly-Asp-Containing Peptides

Summary

We investigated the adhesion of human umbilical vein endothelial cells (HUVECs) to fibrin(ogen) molecule of varying structure for identifying sites that mediate cell attachment. Fibrin was prepared either with ancrod which liberates only FPA from fibrinogen, or with thrombin, which liberates both FPA and FPB. Both fibrin preparations equally supported HUVEC attachment. GRGDS, RGD-containing peptides of snake venoms, and monoclonal antibodies against α_vβ₃ (23C6 and 7E3) inhibited the attachment of HUVECs to fibrin by 65–75%. In contrast, the attachment of HUVECs to fibrinogen was less effective and was almost completely inhibited by both RGD-containing peptides and by antibodies against integrin α_vβ₃ (85-95% inhibition). The C-terminal dodecapeptide of fibrinogen γ chain (residues 400–411) inhibited minimally the attachment of HUVECs to fibrin. Additionally, the binding of RGD-containing snake venom peptides to HUVECs was both RGD- and divalent-cation-dependent. The IC₅₀s for inhibition of HUVEC attachment to fibrin were 0.09 μM (rhodostomin), 1.54 μM (trigramin) and 1.64 μM (halysin).

These results indicate that fibrin mediated support of cell attachment is independent of the cleavage of FPB from fibrinogen. HUVEC attachment to fibrinogen was almost completely inhibited by RGD-containing peptides and by antibodies against α_vβ₃. In contrast, the attachment to fibrin was partially resistant to RGD-containing peptides and to the monoclonal antibodies against integrin α_vβ₃. However, α_vβ₃ is the major receptor mediating HUVEC attachment to fibrin.

• References

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