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• W4320181390 abstract "Heparin-induced thrombocytopenia (HIT) is an adverse reaction to heparin leading to a reduction in circulating platelets with an increased risk of thrombosis. It is precipitated by polymerized immune complexes consisting of pathogenic antibodies that recognize a small chemokine platelet factor 4 (PF4) bound to heparin, which trigger platelet activation and a hypercoagulable state. Characterization of these immune complexes is extremely challenging due to the enormous structural heterogeneity of such macromolecular assemblies and their constituents (especially heparin). We use native mass spectrometry to characterize small immune complexes formed by PF4, heparin and monoclonal HIT-specific antibodies. Up to three PF4 tetramers can be assembled on a heparin chain, consistent with the results of molecular modeling studies showing facile polyanion wrapping along the polycationic belt on the PF4 surface. Although these assemblies can accommodate a maximum of only two antibodies, the resulting immune complexes are capable of platelet activation despite their modest size. Taken together, these studies provide further insight into molecular mechanisms of HIT and other immune disorders where anti-PF4 antibodies play a central role." @default.
• W4320181390 created "2023-02-13" @default.
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• W4320181390 date "2023-02-11" @default.
• W4320181390 modified "2023-09-29" @default.
• W4320181390 title "Molecular architecture and platelet-activating properties of small immune complexes assembled on intact heparin and their possible involvement in heparin-induced thrombocytopenia" @default.
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• W4320181390 doi "https://doi.org/10.1101/2023.02.11.528150" @default.
• W4320181390 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36798284" @default.
• W4320181390 hasPublicationYear "2023" @default.
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