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NPJ Regen Med
2023 Apr 07;81:21. doi: 10.1038/s41536-023-00293-4.
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Endothelial Brg1 fine-tunes Notch signaling during zebrafish heart regeneration.
Xiao C
,
Hou J
,
Wang F
,
Song Y
,
Zheng J
,
Luo L
,
Wang J
,
Ding W
,
Zhu X
,
Xiong JW
.
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Myocardial Brg1 is essential for heart regeneration in zebrafish, but it remains unknown whether and how endothelial Brg1 plays a role in heart regeneration. Here, we found that both brg1 mRNA and protein were induced in cardiac endothelial cells after ventricular resection and endothelium-specific overexpression of dominant-negative Xenopus Brg1 (dn-xbrg1) inhibited myocardial proliferation and heart regeneration and increased cardiac fibrosis. RNA-seq and ChIP-seq analysis revealed that endothelium-specific overexpression of dn-xbrg1 changed the levels of H3K4me3 modifications in the promoter regions of the zebrafish genome and induced abnormal activation of Notch family genes upon injury. Mechanistically, Brg1 interacted with lysine demethylase 7aa (Kdm7aa) to fine-tune the level of H3K4me3 within the promoter regions of Notch family genes and thus regulated notch gene transcription. Together, this work demonstrates that the Brg1-Kdm7aa-Notch axis in cardiac endothelial cells, including the endocardium, regulates myocardial proliferation and regeneration via modulating the H3K4me3 of the notch promoters in zebrafish.
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37029137
???displayArticle.pmcLink???PMC10082087 ???displayArticle.link???NPJ Regen Med ???displayArticle.grants???[+]
31730061 National Natural Science Foundation of China (National Science Foundation of China), 31430059 National Natural Science Foundation of China (National Science Foundation of China), 81870198 National Natural Science Foundation of China (National Science Foundation of China)
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