PNAS:苏州大学全新发现:免疫性血小板减少症的发生新机制

2018-11-09 小通 生物通

免疫性血小板减少症是严重威胁人类健康的疾病,可因严重的血小板减少而导致内出血引起死亡。

免疫性血小板减少症是严重威胁人类健康的疾病,可因严重的血小板减少而导致内出血引起死亡。



苏州大学戴克胜教授课题组研究揭示免疫性血小板减少症(ITP)的发生新机制及治疗策略,研究成果以“Akt-mediated Platelet Apoptosis and its Therapeutic Implications in Immune Thrombocytopenia”(Akt调控的血小板凋亡及其在治疗免疫性血小板减少症中的应用)为题,于2018年10月18日在PNAS上在线发表。闫荣、戴克胜为文章的共同通讯作者。

免疫性血小板减少症是严重威胁人类健康的疾病,可因严重的血小板减少而导致内出血引起死亡。长期以来,尽管国内外学者一直在对ITP进行研究,由于其发生机制尚未完全阐明,仍有一部分病人对现有多种治疗策略反应性较差或无反应。

前期工作证实,具有抗血小板膜糖蛋白(glycoprotein,GP) Ib-IX自身抗体的ITP患者,临床表现为更低的血小板计数,并对现有的常规治疗如激素、免疫球蛋白、甚至脾切除反应差。

最新研究发现,抗GPIb-IX抗体可导致血小板Akt活化,Akt通过磷酸二酯酶(PDE3A)调控的蛋白激酶A(PKA)活性减低诱导血小板凋亡,同时,血小板通过Akt途径导致活化。凋亡和活化的血小板暴露膜表面的磷酯酰丝氨酸(PS),使得血小板被肝脏的库弗细胞识别并吞噬清除。

研究还发现,抑制GPIb-IX、PDE3A、PKA、PS等的生物学活性,或基因敲除相关蛋白,均可抑制抗体导致的血小板被清除,提升血小板数量。

这项研究揭示了免疫性血小板减少症的发生机制,尤其是抑制抗体导致血小板被清除信号通路的多个关键环节,均可抑制血小板被清除,为研制治疗免疫性血小板减少症药物提供了多种新的靶点和策略,具有广阔应用前景。

原始出处:Chen M, Yan R, Zhou K, et al. Akt-mediated platelet apoptosis and its therapeutic implications in immune thrombocytopenia. Proc Natl Acad Sci U S A. 2018 Nov 6

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    2019-10-05 drwjr
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    2018-11-09 红色

    厉害

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