title: Coagulation and fibrinolysis in capybara (Hydrochaeris hydrochaeris), a close relative of the guinea-pig (Cavia porcellus).
abstract: Fibrinolytic and coagulation properties of capybara (Hydrochaeris hydrochaeris, LINNAEUS, 1766) plasma were analysed and the results compared to the guinea-pig (Cavia porcellus), a close relative. Capybara fibrinogen was isolated and fibrinolysis of its plasma was carried out in a homologous system and with bovine fibrin. Undiluted plasma did not have fibrinolytic activity on fibrin plates; euglobulins gave a dose-related response. Zymography of capybara and guinea-pig plasma gave the same patterns of activity as human or bovine plasma. Human urokinase (UK) and tissue plasminogen activator (t-PA) produced lysis in capybara fibrin plates. Streptokinase (SK) (500 IU/ml) did not activate capybara or guinea-pig plasma. In this system, human plasma was extensively activated. Coagulation tests for both species of rodent were prolonged. The capybara showed values for prothrombin time (PT) shorter than activated thromboplastin time (APTT). The guinea-pig, as already shown, had longer PT values. Factors X and VII were very low for capybara and guinea-pig when tested using reference curves and diagnostic kits for human plasma. It is suggested that the capybara could be a valuable laboratory animal considering its size and closeness to the guinea-pig, and this could allow for the provision of materials from one single animal when convenient or necessary.
authors.affiliation: Laboratório de Bioquímica, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, USP, Av. do Café S/N, 14040-903, Ribeirão Preto, São Paulo, Brazil.
authors.forename: D P
authors.initials: DP
authors.lastname: Leitão
authors.forename: A C
authors.initials: AC
authors.lastname: Polizello
authors.forename: Z
authors.initials: Z
authors.lastname: Rothschild
mesh_terms: D000818:Animals; D000830:Animals, Laboratory; D001777:Blood Coagulation; D001779:Blood Coagulation Factors / Q000378:metabolism; D002417:Cattle; D005260:Female; D005340:Fibrinogen / Q000378:metabolism; D005342:Fibrinolysis / Q000187:drug effects; D006168:Guinea Pigs; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D012377:Rodentia / Q000097:blood*; D013045:Species Specificity; D013300:Streptokinase / Q000494:pharmacology; D010959:Tissue Plasminogen Activator / Q000378:metabolism; D014568:Urokinase-Type Plasminogen Activator / Q000378:metabolism
chemical_list: D001779:Blood Coagulation Factors; D005340:Fibrinogen; D013300:Streptokinase; D010959:Tissue Plasminogen Activator; D014568:Urokinase-Type Plasminogen Activator