Autoantibody-mediated desialylation impairs human thrombopoiesis and platelet lifespan.

Autoantibody-mediated desialylation impairs human thrombopoiesis and platelet lifespan.
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DOI:
10.3324/haematol.2019.236117
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发表时间:
2021-01-01
期刊:
影响因子:
10.1
通讯作者:
Bakchoul T
Bakchoul T
中科院分区:
医学1区
文献类型:
--
作者:
Marini I;Zlamal J;Faul C;Holzer U;Hammer S;Pelzl L;Bethge W;Althaus K;Bakchoul T

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免疫性血小板减少症是一种常见的出血性疾病,由自身抗体介导的血小板清除加速和血小板生成受损引起。越来越多的证据表明,去唾液酸化会影响免疫性血小板减少症中的血小板寿命。在此,我们报告了免疫性血小板减少症患者自身抗体的新效应功能,这可能会干扰该疾病的临床表现。我们的研究数据表明,自身抗体的一个亚组能够诱导人血小板和巨核细胞表面的唾液酸残基裂解。此外,自身抗体介导的去唾液酸化会干扰细胞和细胞外基质蛋白之间的相互作用,导致血小板粘附和巨核细胞分化受损。通过结合体外血小板生成模型、人源化动物模型和临床队列研究,我们证明唾液酸的裂解会导致人血小板的产生、存活和功能的显着受损。这些数据可能表明,未来应在临床研究中研究预防去唾液酸化,作为治疗免疫性血小板减少症出血的潜在治疗方法。
Immune thrombocytopenia is a common bleeding disease caused by autoantibody-mediated accelerated platelet clearance and impaired thrombopoiesis. Accumulating evidence suggests that desialylation affects platelet lifespan in immune thrombocytopenia. Herein, we report on novel effector functions of autoantibodies from patients with immune thrombocytopenia, which might interfere with the clinical picture of the disease. Data from our study show that a subgroup of autoantibodies is able to induce cleavage of sialic acid residues from the surface of human platelets and megakaryocytes. Moreover, autoantibody-mediated desialylation interferes with the interaction between cells and extracellular matrix proteins leading to impaired platelet adhesion and megakaryocyte differentiation. Using a combination of an ex vivo model of thrombopoiesis, a humanized animal model, and a clinical cohort study, we demonstrate that cleavage of sialic acid induces significant impairment of the production, survival as well as function of human platelets. These data may indicate that prevention of desialylation should be investigated in the future in clinical studies as a potential therapeutic approach to treat bleeding in immune thrombocytopenia.
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