Endocardial to myocardial notch-wnt-bmp axis regulates early heart valve development.

Endocardial to myocardial notch-wnt-bmp axis regulates early heart valve development.
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心内膜到心肌Notch-Wnt-Bmp 轴调节早期心脏瓣膜发育。

DOI:
10.1371/journal.pone.0060244
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Zhou B
Zhou B
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wang Y;Wu B;Chamberlain AA;Lui W;Koirala P;Susztak K;Klein D;Taylor V;Zhou B

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内皮细胞间质转化(EMT)是心脏瓣膜形成所需的基本细胞过程。已知Notch、Wnt和Bmp途径调节该过程。为了进一步解决这些途径如何在这个过程中协调,我们专门破坏了Notch 1或Jagged 1在小鼠胚胎心脏的内皮细胞,并表明,Jagged 1-Notch 1信号在内皮细胞是必不可少的EMT和早期瓣膜垫形成。qPCR和RNA原位杂交分析显示,内皮细胞Jagged 1-Notch 1信号调节房室管(AVC)内皮细胞中的Wnt 4表达和AVC心肌中的Bmp 2。用Wnt 4或Wnt抑制因子1(Wif 1)处理的全胚胎培养物表明,AVC心肌中的Bmp 2表达依赖于Wnt活性; Wnt 4还恢复了内皮细胞Notch 1缺失胚胎的AVC心肌中的Bmp 2表达。此外,虽然Wnt 4和Bmp 2都挽救了由Notch抑制引起的缺陷性EMT,但Wnt 4需要Bmp来发挥作用。这些结果表明,内分泌细胞中的Jagged 1-Notch 1信号传导诱导Wnt 4的表达,Wnt 4随后作为旁分泌因子上调邻近AVC心肌中的Bmp 2表达以发出EMT信号。
Endocardial to mesenchymal transformation (EMT) is a fundamental cellular process required for heart valve formation. Notch, Wnt and Bmp pathways are known to regulate this process. To further address how these pathways coordinate in the process, we specifically disrupted Notch1 or Jagged1 in the endocardium of mouse embryonic hearts and showed that Jagged1-Notch1 signaling in the endocardium is essential for EMT and early valvular cushion formation. qPCR and RNA in situ hybridization assays reveal that endocardial Jagged1-Notch1 signaling regulates Wnt4 expression in the atrioventricular canal (AVC) endocardium and Bmp2 in the AVC myocardium. Whole embryo cultures treated with Wnt4 or Wnt inhibitory factor 1 (Wif1) show that Bmp2 expression in the AVC myocardium is dependent on Wnt activity; Wnt4 also reinstates Bmp2 expression in the AVC myocardium of endocardial Notch1 null embryos. Furthermore, while both Wnt4 and Bmp2 rescue the defective EMT resulting from Notch inhibition, Wnt4 requires Bmp for its action. These results demonstrate that Jagged1-Notch1 signaling in endocardial cells induces the expression of Wnt4, which subsequently acts as a paracrine factor to upregulate Bmp2 expression in the adjacent AVC myocardium to signal EMT.
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