Myocardial-specific R-spondin3 drives proliferation of the coronary stems primarily through the Leucine Rich Repeat G Protein coupled receptor LGR4.

Myocardial-specific R-spondin3 drives proliferation of the coronary stems primarily through the Leucine Rich Repeat G Protein coupled receptor LGR4.
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DOI:
10.1016/j.ydbio.2018.05.024
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发表时间:
2018-09-01
影响因子:
2.7
通讯作者:
Schedl A
Schedl A
中科院分区:
生物学3区
文献类型:
--
作者:
Da Silva F;Massa F;Motamedi FJ;Vidal V;Rocha AS;Gregoire EP;Cai CL;Wagner KD;Schedl A

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冠状动脉畸形是常见的先天性疾病,在成年后会造成严重后果。当冠状动脉干在主动脉和发育中的血管丛之间形成连接时,冠状动脉循环开始。我们最近确定了WNT信号调节剂R-spondin 3(Rspo 3),作为冠状动脉干增殖的重要调节因子。使用表达分析和组织特异性缺失,我们现在证明Rspo 3主要由心肌细胞产生。此外,我们采用CRISPR/Cas9技术来产生新的Lgr 4无效等位基因,其显示冠状动脉干增殖显著降低,从而表型复制了Rspo 3突变体中观察到的冠状动脉缺陷。有趣的是,Lgr 4突变体显示轻微的右心室,心肌特异性缺失Rspo 3后也进行了观察。这些结果揭示了Rspo 3在心脏发育中的作用,并证明LGR 4是心脏中主要的R-spondin 3受体。
Coronary artery anomalies are common congenital disorders with serious consequences in adult life. Coronary circulation begins when the coronary stems form connections between the aorta and the developing vascular plexus. We recently identified the WNT signaling modulator R-spondin 3 (Rspo3), as a crucial regulator of coronary stem proliferation. Using expression analysis and tissue-specific deletion we now demonstrate that Rspo3 is primarily produced by cardiomyocytes. Moreover, we have employed CRISPR/Cas9 technology to generate novel Lgr4-null alleles that showed a significant decrease in coronary stem proliferation and thus phenocopied the coronary artery defects seen in Rspo3 mutants. Interestingly, Lgr4 mutants displayed slightly hypomorphic right ventricles, an observation also made after myocardial specific deletion of Rspo3. These results shed new light on the role of Rspo3 in heart development and demonstrate that LGR4 is the principal R-spondin 3 receptor in the heart.
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