Notch activates cell cycle reentry and progression in quiescent cardiomyocytes.

Notch activates cell cycle reentry and progression in quiescent cardiomyocytes.
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Notch 激活静止心肌细胞的细胞周期重入和进展。

DOI:
10.1083/jcb.200806104
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发表时间:
2008-10-06
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Mercola M
Mercola M
中科院分区:
其他
文献类型:
--
作者:
Campa VM;Gutiérrez-Lanza R;Cerignoli F;Díaz-Trelles R;Nelson B;Tsuji T;Barcova M;Jiang W;Mercola M

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心肌不能通过复制现有的心肌细胞而再生,这引起了人们对识别能够维持未成熟心肌细胞的增殖能力或刺激有丝分裂后心肌细胞分裂的发育或其他刺激的兴趣。在这里,我们证明了Notch信号的重新激活导致胚胎干细胞来源的和新生的心室肌细胞进入细胞周期。新生心肌细胞的增殖反应随着其成熟而下降,因此Notch的晚期激活触发了DNA损伤检查点和G2/M期停滞。Notch诱导依赖于细胞周期蛋白D1的重组信号结合蛋白1(RBP-Jκ,κ)的表达,但与其他诱导剂不同的是,它也将其亚细胞分布从胞浆转移到细胞核。细胞周期蛋白D1的核定位不依赖于RBP-Jκ。因此,Notch对细胞周期蛋白D1核质定位的影响是Notch胞内域的一种出人意料的特性,它可能在包括肿瘤发生和心脏发生在内的多种环境中调节细胞周期。
The inability of heart muscle to regenerate by replication of existing cardiomyocytes has engendered considerable interest in identifying developmental or other stimuli capable of sustaining the proliferative capacity of immature cardiomyocytes or stimulating division of postmitotic cardiomyocytes. Here, we demonstrate that reactivation of Notch signaling causes embryonic stem cell–derived and neonatal ventricular cardiomyocytes to enter the cell cycle. The proliferative response of neonatal ventricular cardiomyocytes declines as they mature, such that late activation of Notch triggers the DNA damage checkpoint and G2/M interphase arrest. Notch induces recombination signal-binding protein 1 for Jκ (RBP-Jκ)-dependent expression of cyclin D1 but, unlike other inducers, also shifts its subcellular distribution from the cytosol to the nucleus. Nuclear localization of cyclin D1 is independent of RBP-Jκ. Thus, the influence of Notch on nucleocytoplasmic localization of cyclin D1 is an unanticipated property of the Notch intracellular domain that is likely to regulate the cell cycle in multiple contexts, including tumorigenesis as well as cardiogenesis.
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发表时间: 2001-05-14
期刊: The Journal of cell biology
影响因子: --
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影响因子: 10.5
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