Clinical and Experimental Reproductive Medicine

The Korean Society for Reproductive Medicine (대한생식의학회)
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Identification of microRNAs and their target genes in the placenta as biomarkers of inflammation

  • Jang, Hee Yeon (Department of Biomedical Science, CHA University) ;
  • Lim, Seung Mook (Department of Biomedical Science, CHA University) ;
  • Lee, Hyun Jung (Non-Clinical Evaluation Center, CHA Advanced Research Institute) ;
  • Hong, Joon-Seok (Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital) ;
  • Kim, Gi Jin (Department of Biomedical Science, CHA University)
  • Received : 2019.05.01
  • Accepted : 2019.09.18
  • Published : 2020.03.31
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Abstract

Objective: Recently, microRNA (miRNA) has been identified both as a powerful regulator involved in various biological processes through the regulation of numerous genes and as an effective biomarker for the prediction and diagnosis of various disease states. The objective of this study was to identify and validate miRNAs and their target genes involved in inflammation in placental tissue. Methods: Microarrays were utilized to obtain miRNA and gene expression profiles from placentas with or without inflammation obtained from nine normal pregnant women and 10 preterm labor patients. Quantitative real-time polymerase chain reaction and Western blots were performed to validate the miRNAs and differentially-expressed genes in the placentas with inflammation. Correlations between miRNA and target gene expression were confirmed by luciferase assays in HTR-8/SVneo cells. Results: We identified and validated miRNAs and their target genes that were differentially expressed in placentas with inflammation. We also demonstrated that several miRNAs (miR-371a-5p, miR-3065-3p, miR-519b-3p, and miR-373-3p) directly targeted their target genes (LEF1, LOX, ITGB4, and CD44). However, some miRNAs and their direct target genes showed no correlation in tissue samples. Interestingly, miR-373-3p and miR-3065-3p were markedly regulated by lipopolysaccharide (LPS) treatment, although the expression of their direct targets CD44 and LOX was not altered by LPS treatment. Conclusion: These results provide candidate miRNAs and their target genes that could be used as placental biomarkers of inflammation. These candidates may be useful for further miRNA-based biomarker development.

Keywords

References

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