Artículos de revistas
Effects of Lopap on Human Endothelial Cells and Platelets
Fecha
2001-05Registro en:
Chudzinski-Tavassi, A.M.; Schattner, Mirta Ana; Fritzen, M.; Pozner, Roberto Gabriel; Reis, C. V.; et al.; Effects of Lopap on Human Endothelial Cells and Platelets; Karger; Pathophysiology Of Haemostasis And Thrombosis; 31; 3-6; 5-2001; 257-265
1424-8832
CONICET Digital
CONICET
Autor
Chudzinski-Tavassi, A.M.
Schattner, Mirta Ana
Fritzen, M.
Pozner, Roberto Gabriel
Reis, C. V.
Lourenço, D.
Lazzari, María Ángela
Resumen
Severe consumption coagulopathy has been detected in rats after Lopap (a prothrombin activator from Lonomia obliqua caterpillar bristles) infusion and in humans after accidental contact with L. obliqua bristles. However, platelet count and antithrombin (AT) levels were only modestly affected, suggesting that a different form of blood coagulation activation may be involved in this hemorrhagic syndrome. Here we describe that Lopap had no effect on aggregation of washed human platelets induced by several agonists, suggesting that it might not impair platelet function in vivo. AT was able to inhibit the amidolytic activity of thrombin generated by incubation of Lopap with prothrombin in a purified system, which may be different from that generated by the prothrombinase complex in vivo. The surface expression of both ICAM-1 and E-selectin but not of VCAM-1 was upregulated by Lopap in cultured HUVEC, suggesting that it may behave differently from other mediators, such as thrombin and tumor necrosis factor-α.