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Blood:镰状细胞病和β-地中海贫血胎儿血红蛋白诱导表达的异质性机制

2020-04-18 QQY MedSci原创

在全基因转录组、蛋白质组和已知HbF调节因子的表达中,F-红细胞与非HbF表达细胞高度相似。

扭转从胎儿血红蛋白(HbF、α2γ2)到成人(HbA,α2β2)血红蛋白的切换发展是镰状细胞病(SCD)和β-地中海贫血的一种重要的治疗方法。在健康人、SCD患者和接受药物HbF诱导物治疗的患者中,HbF只存在于被称为F细胞的红细胞亚群中。

尽管经过了50多年的观察,即使在基因相同的细胞中,这种HbF异细胞表达模式的原因仍未明确。

成人F细胞可能代表一种从既定细胞向胚胎样表观遗传和转录状态的逆转,或者说,γ-globin基因孤立性的转录和转录后事件可能是异细胞表达模式的基础。

在本研究中,研究人员通过开发从人HUDEP2类红细胞细胞系和原代人红细胞培养中分离出与分化阶段相匹配的晚期成红细胞F细胞和非F细胞(A细胞)的技术来了解HbF活化的异质性。

这些细胞的转录和蛋白质组学分析表明,无论是在基线条件下,还是在使用HbF诱导物羟基脲或波马度胺治疗后,F细胞和A细胞在RNA水平上的差异都非常小。

令人惊讶的是,研究人员没有发现任何已知的HbF调节因子,包括BCL11A或LRF,在表达上存在差异,这或可解释HbF的激活。

本研究表明F成红细胞与不表达HbF的细胞没有显著差异,主要差异可能发生在b-珠蛋白位点的转录水平。

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    2020-04-20 wgx311
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    2020-04-18 肿肿

    机制研究离临床仍然有距离,不过与临床结合思考,仍然有帮助的,不能仅仅是纯临床思维,转化思维同样重要

    0

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