title: Potential role of circulating microRNAs as a biomarker for unexplained recurrent spontaneous abortion.
abstract: To compare circulating microRNA (miRNA) profiles between unexplained recurrent spontaneous abortion (URSA) and normal early pregnancies (NEP) and to evaluate the potential role of circulating miRNA as a biomarker for URSA.
  
  
  
  Laboratory study using human plasma samples.
  
  
  
  Special hospital and research institutes.
  
  
  
  From September 2012 to April 2013, samples of plasma were obtained from 27 URSA patients and 28 NEP patients at 6-10 weeks of gestation at the Department of Reproductive Immunology in Family Planning Special Hospital of Guangdong Province.
  
  
  
  Differential miRNA profiling analysis of plasma collected from URSA and NEP patients was performed with the use of microarray.
  
  
  
  The circulating miRNA expression profile was assessed by means of microarray and real-time quantitative reverse-transcription polymerase chain reaction (qRT-PCR) analysis.
  
  
  
  Twenty-five circulating miRNAs were expressed differentially in URSA compared with NEP. Of these, nine were overexpressed and 16 down-regulated. Six differentially expressed circulating miRNAs were selected to validate the microarray results, and qRT-PCR data confirmed the reliability of the microarray results. Further analysis showed that four circulating miRNAs (miR-320b, miR-146b-5p, miR-221-3p, miR-559) were up-regulated. In URSA, one circulating miRNA (miR-101-3p) was down-regulated in other larger scale samples according to qRT-PCR. Based on target gene analysis, we speculate that these circulating miRNAs regulate URSA by targeting immune, apoptosis, and angiogenic gene functions.
  
  
  
  Circulating microRNAs may be involved in URSA pathogenesis and provide a promising new diagnostic biomarker for URSA.
authors: Key Laboratory of Male Reproductive and Genetics, National Health and Family Planning Commission, Guangzhou, People's Republic of China; Department of Male Reproduction, Family Planning Research Institute of Guangdong, Guangzhou, People's Republic of China; Human Sperm Bank of Guangdong Province, Guangzhou, People's Republic of China. Electronic address: guardqin@163.com.
authors: Weibing
authors: W
authors: Qin
authors: Key Laboratory of Male Reproductive and Genetics, National Health and Family Planning Commission, Guangzhou, People's Republic of China; Department of Male Reproduction, Family Planning Research Institute of Guangdong, Guangzhou, People's Republic of China; Human Sperm Bank of Guangdong Province, Guangzhou, People's Republic of China.
authors: Yunge
authors: Y
authors: Tang
authors: Key Laboratory of Male Reproductive and Genetics, National Health and Family Planning Commission, Guangzhou, People's Republic of China; Research Center of Reproductive Immunology and Endocrinology, Family Planning Research Institute of Guangdong, Guangzhou, People's Republic of China.
authors: Ning
authors: N
authors: Yang
authors: Key Laboratory of Male Reproductive and Genetics, National Health and Family Planning Commission, Guangzhou, People's Republic of China; Research Center of Reproductive Immunology and Endocrinology, Family Planning Research Institute of Guangdong, Guangzhou, People's Republic of China.
authors: Xiangcai
authors: X
authors: Wei
authors: Department of Outpatients, Family Planning Research Institute of Guangdong, Guangzhou, People's Republic of China.
authors: Jiehua
authors: J
authors: Wu
mesh_terms: D000026:Abortion, Habitual / Q000097:blood* / Q000175:diagnosis / Q000235:genetics*; D000328:Adult; D015415:Biomarkers / Q000097:blood; D005260:Female; D053263:Gene Regulatory Networks / Q000235:genetics*; D006801:Humans; D035683:MicroRNAs / Q000097:blood* / Q000235:genetics*; D011247:Pregnancy; D059467:Transcriptome / Q000235:genetics*; D055815:Young Adult
chemical_list: D015415:Biomarkers; D035683:MicroRNAs
keywords: Circulating microRNA; biomarker; microarray; normal early pregnancy; unexplained recurrent spontaneous abortion