Hand2 is an essential regulator for two Notch-dependent functions within the embryonic endocardium.

Hand2 is an essential regulator for two Notch-dependent functions within the embryonic endocardium.
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DOI:
10.1016/j.celrep.2014.11.021
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发表时间:
2014-12-24
期刊:
影响因子:
8.8
通讯作者:
Firulli AB
Firulli AB
中科院分区:
生物学1区
文献类型:
--
作者:
VanDusen NJ;Casanovas J;Vincentz JW;Firulli BA;Osterwalder M;Lopez-Rios J;Zeller R;Zhou B;Grego-Bessa J;De La Pompa JL;Shou W;Firulli AB

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BHLH转录因子Hand2通过在心肌、神经沟和心外膜细胞群中的表达和功能,在心脏形态发生过程中发挥关键作用。在这里,我们展示了Hand2在心内膜中扮演两个重要的Notch依赖的角色。心内膜消融Hand2导致三尖瓣未闭、室间隔缺陷和小梁减少,这些共同类似于人类先天性缺陷性三尖瓣闭锁。我们发现心内膜Hand2是Notch心内膜到心肌信号通路的下游组成部分,也是NeuRegin1的直接转录调节因子。此外,Hand2参与了基于心内膜到心内膜的细胞信号传递,Hand2突变的心脏显示冠状动脉腔密度增加。分子分析进一步揭示了VEGFA、VEGFR2、Nrp1和VEGFR3等血管内皮生长因子信号的几个关键成分的失调。因此,Hand2在心脏生成和冠状动脉血管生成过程中都是心内膜Notch信号的关键下游转录效应器。
The bHLH transcription factor Hand2 plays critical roles during cardiac morphogenesis via expression and function within myocardial, neural crest, and epicardial cell populations. Here we show that Hand2 plays two essential Notch-dependent roles within the endocardium. Endocardial ablation of Hand2 results in failure to develop a patent tricuspid valve, intraventricular septum defects, and hypotrabeculated ventricles, which collectively resemble the human congenital defect tricuspid atresia. We show endocardial Hand2 to be an integral downstream component of a Notch endocardium-to-myocardium signaling pathway, and a direct transcriptional regulator of Neuregulin1. Additionally, Hand2 participates in endocardiumto-endocardium based cell-signaling, with Hand2 mutant hearts displaying an increased density of coronary lumens. Molecular analyses further reveal dysregulation of several crucial components of Vegf signaling, including VegfA, VegfR2, Nrp1, and VegfR3. Thus, Hand2 functions as a crucial downstream transcriptional effector of endocardial Notch signaling during both cardiogenesis and coronary vasculogenesis.
成年小鼠心脏中存在丰富的组织巨噬细胞群,具有独特的交替激活巨噬细胞特征。
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