title: MiR-106b and MiR-15b modulate apoptosis and angiogenesis in myocardial infarction.
abstract: BACKGROUND
  MicroRNAs (miRNAs) are identified as crucial gene regulators in response to myocardial infarction (MI). However, the overall relationships between miRNAs and the gene targets which contribute to the cellular phenotypes in MI are not fully elucidated. To make a better understanding towards functional roles of miRNAs in MI, useful information was mined through bioinformatic techniques.
  
  
  METHODS
  MI-related miRNAs were retrieved from publications, and PicTar, TargetScanS, and miRanda programs were used to predict their gene targets. Gene ontology (GO) and pathway analyses of gene targets were applied to uncover functional roles of miRNAs. The miRNA-gene networks were illustrated by Pajek tool. Finally, validation experiments were performed towards two important miRNAs in the networks.
  
  
  RESULTS
  Up to 119 MI-related miRNAs were retrieved from publications. GO and pathway analyses for their predicted gene targets demonstrated that these dysregulated miRNAs were enriched in cardiovascular-related phenotypes. Through illustrating miRNA-gene networks, overall relationships between miRNAs and gene targets were detected especially in processes of apoptosis and angiogenesis. Moreover, experimental data supported bioinformatic predictions that miR-106b served as an anti-apoptotic modulator through inhibition of p21 expression and miR-15b displayed anti-angiogenesis activity.
  
  
  CONCLUSIONS
  The miRNAs played essential roles in pathological processes of MI. Further, miR-106b and miR-15b maybe mediated as robust regulators in apoptosis or angiogenesis following MI, respectively.
authors.affiliation: Center for Computational Biology and Bioinformatics, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China. zhliu@implad.ac.cn
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Liu
authors.forename: Dan
authors.initials: D
authors.lastname: Yang
authors.forename: Ping
authors.initials: P
authors.lastname: Xie
authors.forename: Guomin
authors.initials: G
authors.lastname: Ren
authors.forename: Guibo
authors.initials: G
authors.lastname: Sun
authors.forename: Xu
authors.initials: X
authors.lastname: Zeng
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Sun
mesh_terms: D017209:Apoptosis / Q000502:physiology*; D001483:Base Sequence; D017931:DNA Primers; D053263:Gene Regulatory Networks; D006801:Humans; D035683:MicroRNAs / Q000235:genetics / Q000502:physiology*; D009203:Myocardial Infarction / Q000503:physiopathology*; D009389:Neovascularization, Pathologic / Q000503:physiopathology*; D016133:Polymerase Chain Reaction
chemical_list: D017931:DNA Primers; C542541:MIRN106 microRNA, human; C505361:MIRN15 microRNA, human; D035683:MicroRNAs