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Blood:GPIbα或可作为抗GPIbα抗体诱导型ITP的生物标志物

2020-03-11 QQY MedSci原创

抗GPIbα抗体诱导的血小板减少症和促血小板生成素的反应机制与抗体剂量的不同而不同。用抗GPIbα抗体靶向巨噬细胞可产生表面GPIbα表达减少的血小板。

抗GPIbα抗体诱导的血小板减少症和促血小板生成素的反应机制与抗体剂量的不同而不同。

用抗GPIbα抗体靶向巨噬细胞可产生表面GPIbα表达减少的血小板。

摘要:

免疫性血小板减少症(ITP)是一种以抗体介导的血小板破坏为特征的获得性出血性疾病。虽然目前提出了不同的机制来解释血小板清除加速和血小板生成受损,但ITP的病理生理机制仍未完全阐明。

在本研究中,研究人员通过其实验室合成的大鼠抗鼠GPIbα单克隆抗体,5A7,检测了两个免疫介导的血小板减少症的小鼠模型。

单次静脉注射大剂量的5A7(2 mg/kg)后,调理后的血小板被迅速从循环系统清除到脾脏和肝脏;这与TPO mRNA的快速上调有关。相反,每3天皮下注射低剂量5A7 (0.08-0.16 mg/kg)则会逐渐降低血小板计数;在这种情况下,只能在脾脏中观察到调理过的血小板,而TPO水平保持不变。

有趣的是,在这两个模型中,在骨髓巨核细胞(MKs)的表面和内部都发现了5A7抗体。因此,在长期皮下注射5A7的模型中产生的血小板的膜表面的GPIbα表达减少。

本研究结果表明,相对于血小板的体积,血小板表面GPIbα的表达量或可作为一个潜在的标志物,用以诊断抗GPIbα抗体诱导型ITP。

原始出处:

Yosuke Morodomi, et al. Mechanisms of anti-GPIbα antibody-induced thrombocytopenia in mice. Blood. March 10, 2020.

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    2020-03-13 whmdzju
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