Notch3/Jagged1 circuitry reinforces notch signaling and sustains T-ALL.

Notch3/Jagged1 circuitry reinforces notch signaling and sustains T-ALL.
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DOI:
10.1016/j.neo.2014.10.004
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发表时间:
2014-12
期刊:
影响因子:
4.8
通讯作者:
Bellavia, Diana
Bellavia, Diana
中科院分区:
医学2区
文献类型:
--
作者:
Pelullo, Maria;Quaranta, Roberta;Talora, Claudio;Checquolo, Saula;Cialfi, Samantha;Felli, Maria Pia;te Kronnie, Geertruy;Borga, Chiara;Besharat, Zein Mersini;Palermo, Rocco;Di Marcotullio, Lucia;Capobianco, Anthony J.;Gulino, Alberto;Screpanti, Isabella;Bellavia, Diana

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Notch信号转导失调与T细胞急性淋巴细胞白血病(T-ALL)广泛相关。在这里,我们展示了Notch 3受体和Jagged 1配体在人类细胞系和小鼠T-ALL模型中的直接关系。我们提供的证据表明,Notch特异性配体Jagged 1是一个新的Notch 3信号转导靶基因。这一重要事件证明了同一细胞内Notch 3/Jagged 1顺式表达异常的合理性。此外,我们证明在Notch 3-IC过表达的T淋巴瘤细胞中,锯齿状蛋白1经历了筏相关的组成性加工。蛋白水解切割允许Jagged 1胞内结构域赋予Notch信号传导活性并增加Jagged 1自身的转录激活(自分泌效应)。另一方面,可溶性Jagged 1胞外结构域的释放对激活相邻细胞中的Notch信号传导具有积极影响(旁分泌效应),最终产生Notch 3/Jagged 1自维持环,其支持淋巴瘤细胞的存活、增殖和侵袭,并有助于Notch依赖性T-ALL的发展和进展。这些观察结果也得到了对一组患者进行的研究的支持,其中Jagged 1表达与不良预后相关。
Deregulated Notch signaling has been extensively linked to T-cell acute lymphoblastic leukemia (T-ALL). Here, we show a direct relationship between Notch3 receptor and Jagged1 ligand in human cell lines and in a mouse model of T-ALL. We provide evidence that Notch-specific ligand Jagged1 is a new Notch3 signaling target gene. This essential event justifies an aberrant Notch3/Jagged1 cis-expression inside the same cell. Moreover, we demonstrate in Notch3-IC–overexpressing T lymphoma cells that Jagged1 undergoes a raft-associated constitutive processing. The proteolytic cleavage allows the Jagged1 intracellular domain to empower Notch signaling activity and to increase the transcriptional activation of Jagged1 itself (autocrine effect). On the other hand, the release of the soluble Jagged1 extracellular domain has a positive impact on activating Notch signaling in adjacent cells (paracrine effect), finally giving rise to a Notch3/Jagged1 auto-sustaining loop that supports the survival, proliferation, and invasion of lymphoma cells and contributes to the development and progression of Notch-dependent T-ALL. These observations are also supported by a study conducted on a cohort of patients in which Jagged1 expression is associated to adverse prognosis.
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