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Thromb Haemost 1993; 69(05): 490-495
DOI: 10.1055/s-0038-1651639
Original Article
Platelets
Schattauer GmbH Stuttgart

Effects of Hybrid Peptide Analogs to Receptor Recognition Domains on α- and γ-Chains of Human Fibrinogen on Fibrinogen Binding to Platelets

Hiroshi Mohri
The First Department of Internal Medicine, Yokohama City University School of Medicine, Yokohama, Japan
,
Takao Ohkubo
The First Department of Internal Medicine, Yokohama City University School of Medicine, Yokohama, Japan
› Author Affiliations
Further Information

Publication History

Received 07 September 1992

Accepted after revision 21 December 1992

Publication Date:
25 July 2018 (online)

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Summary

We synthesized a series of hybrid peptides that correspond to the γ-chain dodecapeptide (400-411), variable numbers of glycine residues, and the RGDS peptide [Y-HHLGGAK-QAGDV(G) n RGDS] to investigate the relationship of these receptor recognition domains of fibrinogen to platelet membrane glycoprotein IIb/IIIa. The tetrapeptide RGDS, the GRGDSPA peptide and the dodecapeptide inhibited binding of fibrinogen to GPIIb/IIIa by 50% (IC50) at concentrations of 17 ± 1.6 μM, 15 ± 2.1 μM, and 87 ± 6.8 μM, respectively. The inhibitory effect of hybrid peptides increased as the number of glycine residues increased, plateauing with 9-11 glycine residues in hybrid peptide analogs, which had an IC50 of 0.68 ± 0.14 μM. These hybrid peptides completely inhibited the binding of fibrinogen to activated platelets when used in sufficient concentrations. The peptide Y-HHLGGAKQAGDV(G)9RGDS blocked ADP-induced aggregation in citrated platelet-rich plasma with IC50 of 3.5 ± 0.6 μM. When the peptide Y-HHLGGAK-QAGDV(G)9RGDS was labeled with 125I to quantify its binding to platelets, maximal binding was observed within 30 min. The binding sites of the hybrid peptide were 43,600 molecules/platelet (K d = 3.1 ± 0.5 × 10-7 M) to stimulated platelets and 12,500 molecules/platelet (K d = 1.4 ± 0.2 × 10-7 M) to nonstimulated platelets. The hybrid peptides had the same binding affinity to platelets as fibrinogen and inhibited platelet function. Moreover, anti-GPIIb/IIIa antibody inhibited the binding of the labeled hybrid peptide to stimulated platelets. These results indicate that in the native fibrinogen molecule the presence of both RGD sequence or γ-chain domain at optimal distances increased the binding affinity to GPIIb/IIIa. These domains may be the source of hybrid peptide, expanding a new class of platelet inhibitors that act at membrane receptors for adhesive proteins.

 

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