title: Overexpression of miR-19b impairs cardiac development in zebrafish by targeting ctnnb1.
abstract: BACKGROUND
  MicroRNAs are broadly accepted as crucial regulators of cardiovascular development, and dysregulation of their expression has been linked to cardiac disease. MicroRNA cluster miR-17-92 has been implicated in cardiac development and function, yet its defined mechanisms of action in this context are uncertain. Here, we focused on miR-19b, a key component of the miR-17-92 cluster proven to induce cardiomyocyte proliferation in vitro. We aimed to identify the biological significance of miR-19b in cardiac development and its underlying molecular mechanism of action in vivo.
  
  
  METHODS
  We micro-injected zebrafish embryos with different concentrations (0, 2, 4 and 8 μm) of miR-19b mimics or a negative control, and assessed the embryo malformation rate, mortality rate, hatching rate and heart abnormalities at 72 hours post-fertilization (72 hpf).
  
  
  RESULTS
  We found that overexpression of miR-19b impacted left-right symmetry and cardiac development of zebrafish embryos, characterized by pericardial edema, slower heart rate and cardiac looping defects in a dose-dependent manner. Moreover, several important signaling molecules in the Wnt signaling pathway were abnormally expressed, suggesting that overexpression of miR-19b induces the inhibition of the Wnt signaling pathway by directly targeting ctnnb1. Interestingly, the deformed cardiac phenotype was partially rescued by treatment with the GSK3β inhibitor lithium chloride.
  
  
  CONCLUSIONS
  Our findings suggest that miR-19b regulates laterality development and heart looping in zebrafish embryos by targeting ctnnb1.
authors.affiliation: State key Laboratory of Reproductive Medicine, Department of Pediatrics, Nanjing Maternity and Child Health Care Hospital Affiliated to Nanjing Medical University, Nanjing, China.
authors.forename: Mengmeng
authors.initials: M
authors.lastname: Li
authors.forename: Xiaoshan
authors.initials: X
authors.lastname: Hu
authors.forename: Jingai
authors.initials: J
authors.lastname: Zhu
authors.forename: Chun
authors.initials: C
authors.lastname: Zhu
authors.forename: Shasha
authors.initials: S
authors.lastname: Zhu
authors.forename: Xuehua
authors.initials: X
authors.lastname: Liu
authors.forename: Jing
authors.initials: J
authors.lastname: Xu
authors.forename: Shuping
authors.initials: S
authors.lastname: Han
authors.forename: Zhangbin
authors.initials: Z
authors.lastname: Yu
mesh_terms: D000818:Animals; D004625:Embryo, Nonmammalian / Q000002:abnormalities / Q000187:drug effects / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental; D038362:Glycogen Synthase Kinase 3 / Q000037:antagonists & inhibitors / Q000378:metabolism; D000071679:Glycogen Synthase Kinase 3 beta; D006321:Heart / Q000196:embryology; D017403:In Situ Hybridization; D018021:Lithium Chloride / Q000494:pharmacology; D035683:MicroRNAs / Q000235:genetics*; D009206:Myocardium / Q000378:metabolism* / Q000473:pathology; D010490:Pericardial Effusion / Q000196:embryology / Q000235:genetics / Q000517:prevention & control; D020133:Reverse Transcriptase Polymerase Chain Reaction; D060449:Wnt Signaling Pathway / Q000235:genetics; D015027:Zebrafish / Q000196:embryology / Q000378:metabolism*; D029961:Zebrafish Proteins / Q000235:genetics* / Q000378:metabolism; D051176:beta Catenin / Q000235:genetics* / Q000378:metabolism
chemical_list: C000601318:MIRN19 microRNA, zebrafish; D035683:MicroRNAs; D029961:Zebrafish Proteins; D051176:beta Catenin; C495269:ctnnb1 protein, zebrafish; D000071679:Glycogen Synthase Kinase 3 beta; D038362:Glycogen Synthase Kinase 3; D018021:Lithium Chloride