Oncogenesis of T-ALL and nonmalignant consequences of overexpressing intracellular NOTCH1.

Oncogenesis of T-ALL and nonmalignant consequences of overexpressing intracellular NOTCH1.
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DOI:
10.1084/jem.20081561
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发表时间:
2008-11-24
影响因子:
15.3
通讯作者:
von Boehmer, Harald
von Boehmer, Harald
中科院分区:
医学1区
文献类型:
--
作者:
Li, Xiaoyu;Gounari, Fotini;Protopopov, Alexei;Khazaie, Khashayarsha;von Boehmer, Harald

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导致细胞内Notch 1(ICN 1)过表达的突变经常在人T细胞急性淋巴细胞白血病(T-ALL)中观察到。我们已经确定了ICN 1过表达的后果,从逆转录病毒载体引入骨髓细胞。早期结果是产生多克隆非致瘤性CD 4 +8+ T细胞受体(TCR)-αβ+细胞,尽管观察到它们过表达Notch 1和c-Myc并通过翻译后修饰降解肿瘤抑制因子E2 A,但这些细胞不符合肿瘤前体的条件。第一个致瘤细胞是在更不成熟的CD 4 −8+TCR-αβ−细胞中检测到的,这些细胞产生具有单一独特TCR-β链和不同TCR-α链的单克隆肿瘤,将恶性转化精确定位到前TCR信号传导之后和TCR-α重排完成之前的阶段。在T-ALL中,E2 A缺陷伴随着c-Myc的进一步转录上调和伴随的c-Myc-p53轴在转录水平的失调。尽管肿瘤由表型异质性细胞组成,但没有发现肿瘤干细胞的证据。根据基于阵列的比较基因组杂交(阵列CGH)和光谱核型(SKY)分析判断,没有肿瘤是由于基因组不稳定而产生的。
Mutations resulting in overexpression of intracellular Notch1 (ICN1) are frequently observed in human T cell acute lymphoblastic leukemia (T-ALL). We have determined the consequences of ICN1 overexpression from retroviral vectors introduced into bone marrow cells. Early consequences are the generation of polyclonal nontumorigenic CD4+8+ T cell receptor (TCR)-αβ+ cells that do not qualify as tumor precursors despite the observation that they overexpress Notch 1 and c-Myc and degrade the tumor suppressor E2A by posttranslational modification. The first tumorigenic cells are detected among more immature CD4−8+TCR-αβ− cells that give rise to monoclonal tumors with a single, unique TCR-β chain and diverse TCR-α chains, pinpointing malignant transformation to a stage after pre-TCR signaling and before completion of TCR-α rearrangement. In T-ALL, E2A deficiency is accompanied by further transcriptional up-regulation of c-Myc and concomitant dysregulation of the c-Myc-p53 axis at the transcriptional level. Even though the tumors consist of phenotypically heterogeneous cells, no evidence for tumor stem cells was found. As judged by array-based comparative genomic hybridization (array CGH) and spectral karyotype (SKY) analysis, none of the tumors arise because of genomic instability.
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