Anti-platelet Factor 4/Heparin Antibody Production in a Mouse Immunization Model

Heparin-induced thrombocytopenia (HIT) is the most prevalent form of drug-induced, immune-mediated thrombocytopenia. It involves the production of antibodies that target platelet factor 4 (PF4) in complex with heparin, leading to platelet activation. The pathogenesis of HIT is not fully understood, primarily due to the limitations of studying human patients. To bridge this gap and gain a deeper understanding of the mechanisms behind HIT antibody generation, researchers developed a murine model using immunization with mouse PF4 (mPF4)/heparin complexes. Here, we provide a detailed methodology for inducing mPF4/heparin antibodies in C57BL/6 mice and validating the immunization process. Through these techniques, we identified the critical subset of B cells responsible for producing mPF4/heparin-specific antibodies, as well as other immune cells essential for regulating this production. This immunization-based mouse model of HIT is a valuable tool for studying the immunopathogenesis of the condition.