title: Dysregulated Expression Profiles of MicroRNAs of Experimentally Induced Cerebral Aneurysms in Rats.
abstract: OBJECTIVE
  Cerebral aneurysm (CA) is an important acquired cerebrovascular disease that can cause catastrophic results. MicroRNAs (miRNAs) are small non-coding RNAs, playing essential roles in modulating basic physiologic and pathological processes. Currently, evidences have been established about biologic relationship between miRNAs and abdominal aortic aneurysms. However, biologic roles of miRNAs in CA formation have not been explained yet. We employed microarray analysis to detect and compare miRNA expression profiles in late stage of CA in rat model.
  
  
  METHODS
  Twenty-six, 7-week-old male Sprague-Dawley rats underwent a CA induction procedure. The control animals (n=11) were fed a normal diet, and the experimental animals (n=26) were fed a normal diet with 1% normal saline for 3 months. Then, the rats were sacrificed, their cerebral arteries were dissected, and the five regions of aneurysmal dilation on the left posterior communicating artery were cut for miRNA microarrays analysis. Six miRNAs (miRNA-1, miRNA-223, miRNA-24-1-5p, miRNA-551b, miRNA-433, and miRNA-489) were randomly chosen for validation using real-time quantitative PCR.
  
  
  RESULTS
  Among a set of differentially expressed miRNAs, 14 miRNAs were over-expressed more than 200% and 6 miRNAs were down-expressed lower than 50% in the CA tissues.
  
  
  CONCLUSIONS
  The results show that miRNAs might take part in CA formation probably by affecting multiple target genes and signaling pathways. Further investigations to identify the exact roles of these miRNAs in CA formation are required.
authors.affiliation: Department of Neurosurgery, Daejeon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Daejeon, Korea.
authors.forename: Hyung-Jin
authors.initials: HJ
authors.lastname: Lee
authors.forename: Jin-Seok
authors.initials: JS
authors.lastname: Yi
authors.forename: Hong-Jae
authors.initials: HJ
authors.lastname: Lee
authors.forename: Il-Woo
authors.initials: IW
authors.lastname: Lee
authors.forename: Ki-Cheol
authors.initials: KC
authors.lastname: Park
authors.forename: Ji-Ho
authors.initials: JH
authors.lastname: Yang
keywords: Apoptosis; Cell proliferation; Inflammation; Intracranial aneurysm; MicroRNAs
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