When Will Fondaparinux Induce Thrombocytopenia?

When Will Fondaparinux Induce Thrombocytopenia?
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DOI:
10.1021/acs.bioconjchem.2c00316
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发表时间:
2022-08-17
影响因子:
4.7
通讯作者:
Nguyen, Thi-Huong
Nguyen, Thi-Huong
中科院分区:
化学2区
文献类型:
--
作者:
Chen, Li-Yu;Khan, Nida;Lindenbauer, Annerose;Nguyen, Thi-Huong

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五糖磺达肝素是一种合成的选择性Xa因子抑制剂,是肝素家族中最安全的抗凝剂之一,被推荐作为对其他药物过敏的患者(如肝素诱导的血小板减少症(HIT))的替代药物。然而,已经报告了磺达肝素诱导的血小板减少症(FIT)的一些观察结果,而其他人声称FIT不会发生在磺达肝素治疗的患者中,这表明FIT的机制仍然存在争议。在这里,我们利用不同的方法,包括动态光散射,免疫吸附和血小板聚集试验,共聚焦激光扫描显微镜,流式细胞术,以获得深入了解FIT。我们发现,在一定浓度下,磺达肝癸钠与PF 4形成足够大且稳定的复合物,促进HIT样单克隆KKO抗体的结合,并增强血小板聚集和活化。我们提出了一个模型来描述磺达肝癸钠浓度在与血小板因子4形成复合物中的作用,以及它如何促进KKO的结合。我们的研究结果澄清了有争议的观察FIT的患者,因为每个包含不同的PF4:磺达肝癸钠浓度比。
The pentasaccharide Fondaparinux, a synthetic selective factor Xa inhibitor, is one of the safest anticoagulants in the heparin family that is recommended as an alternative drug for patients with hypersensitivity to other drugs such as heparin-induced thrombocytopenia (HIT). However, some observations of Fondaparinux-induced thrombocytopenia (FIT) have been reported while others claimed that FIT does not occur in patients with fondaparinux therapy, indicating that the mechanism of FIT remains controversial. Here, we utilized different methodologies including dynamic light scattering, immunosorbent and platelet aggregation assays, confocal laser scanning microscopy, and flow cytometry to gain insights into FIT. We found that at a certain concentration, Fondaparinux formed sufficient large and stable complexes with PF4 that facilitated binding of the HIT-like monoclonal KKO antibody and enhanced platelet aggregation and activation. We proposed a model to describe the role of Fondaparinux concentration in the formation of complexes with platelet factor 4 and how it promotes the binding of KKO. Our results clarify controversial observations of FIT in patients as each contains a dissimilar PF4:Fondaparinux concentration ratio.
参与肝素诱导的血小板减少症的免疫复合物的原子描述。
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