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Related Experiment Videos

Pneumococcus-induced thrombocytopenia in rabbits.

S E Goldblum, T L Simon, J P Thilsted

    The Journal of Laboratory and Clinical Medicine
    |September 1, 1985
    PubMed
    Summary

    Pneumococcus (PNC) infection causes significant thrombocytopenia in rabbits by directly affecting platelets. This study identifies a PNC-derived substance responsible for rapid platelet count reduction without altering other clotting factors.

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    Area of Science:

    • Hematology
    • Microbiology
    • Pathophysiology

    Background:

    • Thrombocytopenia is a common coagulopathy in sepsis.
    • Sepsis-induced thrombocytopenia often occurs without other hemostatic abnormalities.

    Purpose of the Study:

    • To investigate pneumococcus (PNC)-induced hemostatic changes, specifically thrombocytopenia, in a rabbit model.
    • To elucidate the mechanism behind PNC-induced thrombocytopenia.

    Main Methods:

    • Rabbits were injected with nonviable PNC and infused with chromium 51-labeled platelets or iodine 125-fibrinogen.
    • Blood and tissue samples were analyzed for platelet counts, radioactivity, and fibrin degradation products.
    • In vitro experiments assessed the effect of PNC-incubated serum, plasma, and saline on platelet counts.

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    Main Results:

    • PNC challenge led to profound thrombocytopenia (mean nadir -80%) and shortened platelet survival.
    • Fibrinogen levels increased, but fibrinogen survival remained unchanged.
    • A PNC-derived substance, independent of complement or capsular polysaccharide, caused rapid thrombocytopenia in vitro.

    Conclusions:

    • Pneumococcus-induced thrombocytopenia in rabbits is primarily mediated by a direct effect of PNC-derived substances on circulating platelets.
    • This mechanism explains thrombocytopenia in sepsis without other significant hemostatic alterations.