Platelet accumulation on fibrin-coated polyethylene: role of platelet activation and factor XIII.
Thromb Haemost
; 73(5): 850-6, 1995 May.
Article
em En
| MEDLINE
| ID: mdl-7482415
Platelet accumulation on small- and medium-calibre vascular grafts plays a significant role in graft occlusion. We examined platelet accumulation on the surface of fibrin-coated polyethylene tubing (internal diameter 0.17 cm) during 10 min flow (10 ml/min) at high wall shear rate (764 s-1). Washed platelets labelled with 51Cr were resuspended in Tyrode solution containing albumin, apyrase and red blood cells (hematocrit 40%). When the thrombin that was used to form the fibrin-coated surface was inactivated with FPRCH2Cl before perfusion of the tubes with the platelet: red blood cell suspension, the accumulation of platelets was 59,840 +/- 27,960 platelets per mm2, whereas accumulation on fibrin with residual active thrombin was 316,750 +/- 32,560 platelets per mm2 (n = 4). When the fibrin on the surface was cross-linked by including recombinant factor XIII (rFXIII) in the fibrinogen solution used to prepare the fibrin-coated surface, platelet accumulation, after thrombin neutralization, was reduced by the cross-linking from 46,974 +/- 9702 to 36,818 +/- 7964 platelets per mm2 (n = 12, p < 0.01). Platelet accumulation on tubes coated with D-dimer was ten times less than on tubes coated with D-domain; this finding also supports the observation that cross-linking of fibrin with the formation gamma-gamma dimers reduces platelet accumulation on the fibrin-coated surface. Thrombin-activated platelets themselves were shown to cross-link fibrin when they had adhered to it during perfusion, or in a static system in which thrombin was used to form clots from FXIII-free fibrinogen in the presence of platelets.(ABSTRACT TRUNCATED AT 250 WORDS)
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Base de dados:
MEDLINE
Assunto principal:
Fator XIII
/
Fibrina
/
Ativação Plaquetária
/
Adesividade Plaquetária
/
Oclusão de Enxerto Vascular
Limite:
Humans
Idioma:
En
Ano de publicação:
1995
Tipo de documento:
Article