title: Signature of circulating microRNAs as potential biomarkers in vulnerable coronary artery disease.
abstract: OBJECTIVE
  MicroRNAs (miRNAs) play important roles in the pathogenesis of cardiovascular diseases. Circulating miRNAs were recently identified as biomarkers for various physiological and pathological conditions. In this study, we aimed to identify the circulating miRNA fingerprint of vulnerable coronary artery disease (CAD) and explore its potential as a novel biomarker for this disease.
  
  
  RESULTS
  The Taqman low-density miRNA array and coexpression network analyses were used to identify distinct miRNA expression profiles in the plasma of patients with typical unstable angina (UA) and angiographically documented CAD (UA group, n = 13) compared to individuals with non-cardiac chest pain (control group, n = 13). Significantly elevated expression levels of miR-106b/25 cluster, miR-17/92a cluster, miR-21/590-5p family, miR-126*, and miR-451 were observed in UA patients compared to controls. These findings were validated by real-time PCR in another 45 UA patients, 31 stable angina patients, and 37 controls. In addition, miR-106b, miR-25, miR-92a, miR-21, miR-590-5p, miR-126* and miR-451 were upregulated in microparticles (MPs) isolated from the plasma of UA patients (n = 5) compared to controls (n = 5). Using flow cytometry and immunolabeling, we further found that Annexin V(+) MPs were increased in the plasma samples of UA patients compared to controls, and the majority of the increased MPs in plasma were shown to be Annexin V(+) CD31(+) MPs. The findings suggest that Annexin V(+) CD31(+) MPs may contribute to the elevated expression of the selected miRNAs in the circulation of patients with vulnerable CAD.
  
  
  CONCLUSIONS
  The circulating miRNA signature, consisting of the miR-106b/25 cluster, miR-17/92a cluster, miR-21/590-5p family, miR-126* and miR-451, may be used as a novel biomarker for vulnerable CAD.
  
  
  BACKGROUND
  Chinese Clinical Trial Register, ChiCTR-OCH-12002349.
authors: Department of Cardiology, Peking University People's Hospital, Beijing, China.
authors: Jingyi
authors: J
authors: Ren
authors: Jing
authors: J
authors: Zhang
authors: Ning
authors: N
authors: Xu
authors: Guanping
authors: G
authors: Han
authors: Qiang
authors: Q
authors: Geng
authors: Junxian
authors: J
authors: Song
authors: Sufang
authors: S
authors: Li
authors: Jianqing
authors: J
authors: Zhao
authors: Hong
authors: H
authors: Chen
mesh_terms: D000789:Angina, Unstable / Q000097:blood / Q000235:genetics / Q000473:pathology; D015415:Biomarkers / Q000097:blood; D055252:Cell-Derived Microparticles / Q000378:metabolism; D003324:Coronary Artery Disease / Q000097:blood* / Q000235:genetics / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D035683:MicroRNAs / Q000097:blood* / Q000235:genetics; D008875:Middle Aged; D015203:Reproducibility of Results; D059467:Transcriptome
chemical_list: D015415:Biomarkers; D035683:MicroRNAs