Blood:B-ALL超二倍体细胞有丝分裂和染色体缺陷的分子机制

2020-05-02 QQY MedSci原创

HyperD-ALL在有丝分裂早期出现延迟,这与染色体排列和分离缺陷有关。 凝蛋白复合物受损会导致AURKB缺陷,触发染色单体内聚缺陷和HyperD-ALL的有丝分裂滑移。

B细胞急性淋巴细胞白血病(B-ALL)是最常见的儿童癌症,高超二倍体(HyperD)是儿童B-ALL最常见的亚型。虽然,HyperD是儿童B-ALL的起始致癌事件,但与HyperD B-ALL(HyperD-ALL)相关的有丝分裂和染色体缺陷仍然缺乏特征性。

在本研究中,Oscar等人用54个原发性儿童B-ALL的样本来表征有丝分裂/染色体缺陷潜在的细胞-分子机制,这些缺陷被预测为HyperD-ALL的早期致病因素。

结果发现,HyperD-ALL母细胞低增殖,表现出早期有丝分裂延迟,与中期平板上的染色体对齐缺陷有关,导致染色体分离缺陷和非模态核型。在机制上,生化、功能和质谱分析表明,HyperD-ALL细胞中的凝集素复合体受损,导致染色体凝聚减少、着丝粒硬度丧失、染色体乘客复合体蛋白Aurora B激酶(AURKB)和Survivin在早期有丝分裂中定位异常。

此外,HyperD-ALL细胞还表现出染色单体凝聚缺陷和纺锤体组装检查点(SAC)受损,因此,在凝聚素复合体缺陷下游,由于AURKB缺陷和SAC活性受损,最终导致有丝分裂滑脱。在AURKB和/或SAC抑制下,健康CD34+干/祖细胞出现染色体结构/凝集缺陷和超二倍体。

总体而言,超二倍体B-ALL与有缺陷的凝聚素复合体、AURKB和SAC有关。

原始出处:

Molina Oscar,Vinyoles Meritxell,Granada Isabel et al. Impaired Condensin Complex and Aurora B kinase underlie mitotic and chromosomal defects in hyperdiploid B-cell ALL. Blood, April 22,2020.

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    2020-05-04 膀胱癌
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    2020-05-02 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

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