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. 1966 Oct 31;124(5):971–982. doi: 10.1084/jem.124.5.971

EFFECTS OF BACTERIAL ENDOTOXIN ON RABBIT PLATELETS

IV. THE DIVALENT ION REQUIREMENTS OF ENDOTOXIN-INDUCED AND IMMUNOLOGICALLY INDUCED PLATELET INJURY

Roger M Des Prez 1, Richard E Bryant 1
PMCID: PMC2138272  PMID: 5951281

Abstract

The divalent ion requirements of rabbit platelet injury by endotoxin have been defined by the use of various anticoagulant solutions and have been compared to the divalent ion requirements of platelet injury produced by addition of antigen to immune platelet-rich plasma. The endotoxin-platelet interaction takes place in citrated blood. Platelet damage by antigen is inhibited by citrate, but preincubation of antigen and immune platelet-poor plasma in the absence of citrate results in a substance, presumably antigen-antibody complement complex, which then does injure platelets in the presence of citrate. Neither endotoxin nor preincubated antigen injures platelets in the presence of sodium EDTA in concentrations sufficient to interact with all divalent cations present in plasma. These observations have been interpreted by viewing the platelet-endotoxin interaction as a consequence of platelet phagocytosis of endotoxin, a reaction not requiring complement but requiring definite small concentrations of divalent cations. The interaction of antigen and platelets is regarded as a two phase reaction, the first requiring the participation of complement and concentrations of divalent cation larger than those provided in citrated plasma, the second requiring smaller concentrations of divalent cation, no further participation of complement, and active in citrated plasma. This second phase is regarded as representing platelet phagocytosis of immune complexes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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