Platelet dysfunction during Bothrops jararaca snake envenomation in rabbits

Marcelo Larami Santoro; Ida Sigueko Sano-Martins

doi:10.1160/TH04-02-0120

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2004; 92(02): 369-383
DOI: 10.1160/TH04-02-0120

Platelets and Blood Cells

Schattauer GmbH

Platelet dysfunction during Bothrops jararaca snake envenomation in rabbits

Marcelo Larami Santoro

¹Laboratory of Pathophysiology, Institute Butantan, São Paulo, Brazil

,

Ida Sigueko Sano-Martins

¹Laboratory of Pathophysiology, Institute Butantan, São Paulo, Brazil

› Author Affiliations

Abstract

Summary

Despite being well established that snake envenomation causes blood coagulation and fibrinolysis disturbances, scant information is available about blood platelet disorders. Herein we show that experimentally Bothrops jararaca-envenomed rabbits presented thrombocytopenia, hypofibrinogenemia, elevation of von Willebrand factor plasma levels, platelet hypoaggregation in platelet rich plasma and whole blood, normoaggregation in washed platelet suspensions, decreased platelet ATP secretion, normal plasma levels of platelet factor 4, and constant intraplatelet serotonin levels. Furthermore, by flow cytometric analyses, platelets displayed a significant decrease in the expression of a GPIIb-IIIa epitope recognized by P2 monoclonal antibody (p< 0.05) and an increased expression of a ligandinduced binding site (LIBS-1) of GPIIIa (p< 0.05), but total GPIIb-IIIa expression, evaluated with specific polyclonal antibodies, was normal. Fibrinogen and fibrin(ogen) degradation product (FfDP) expression on platelet surface showed no significant alteration. Nonetheless, significant elevations of platelet P-selectin were noticed on circulating platelets. The percentage of circulating reticulated platelets and the survival time of biotinylated platelets of envenomed rabbits were not statistically different from control animals. We suggest that thrombin engendered by procoagulating components of B. jararaca venom has an essential role in the pathogenesis of platelet and coagulation disorders in this experimental model. Increased expression of P-selectin in the experimental group demonstrates that platelets of envenomed rabbits are indeed activated in circulation, and that decreased fibrinogen or increased FfDP levels are not the primary cause of platelet dysfunction. These results imply the existence of an inhibitor in plasma that interferes with platelet aggregation in bothropic envenomation.

Keywords

Snake - envenomation - rabbit - Bothrops - thiazole orange - cytometry

Full Text

References

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