Blood:芳香化酶是cereblon的新底物,参与IMiDs诱导性血小板减少症的发生

2020-04-01 MedSci原创 MedSci原创

IMiDs诱导芳香化酶降解,影响人巨噬细胞的雌二醇自分泌信号。 IMiDs介导的芳香化酶降解通过抑制血小板前体的形成诱发血小板减少症。

免疫调节药物(IMiDs)是治疗染色体5q缺失的多发性骨髓瘤和骨髓增生异常综合症的关键药物。IMiD通过将新底物募集给E3连接酶cereblon来发挥其多效作用,即充当E3泛素连接酶复合物的底物受体;因此,鉴定细胞特异性新底物对于理解IMiD的作用至关重要。

在临床实践中,IMiDs可诱发血小板减少症,常导致IMiDs治疗中断。在本研究中,研究人员旨在解析由IMiDs治疗诱导的血小板减少症的分子机制。

研究人员发现IMiD通过抑制人类巨核细胞中的自分泌雌二醇信号传导(功能性血小板生产的一个关键步骤)严重影响了血小板的形成。此外,研究人员鉴定出芳香化酶,雌二醇生物合成中不可缺少的一个酶,是cereblon的一种新型底物。

IMiDs可促进将芳香化酶募集给cereblon,导致芳香化酶通过蛋白酶体依赖性方式降解。最后,在用IMiDs治疗导致了血小板减少症的多发性骨髓瘤患者的骨髓中,芳香化酶明显降解。

本研究表明芳香化酶是cereblon的一种新型底物,参与IMiDs诱导的血小板减少症的发生。

原始出处:

Taro Tochigi, et al. Aromatase is a novel neo-substrate of cereblon responsible for immunomodulatory drugs-induced thrombocytopenia. Blood. March 27, 2020.

 

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    2020-08-22 wgx306
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