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A Quantitative Detection Method for MicroRNAs in the Kidney of an Ischemic Kidney Injury Mouse Model
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Defining a microRNA-mRNA interaction map for calcineurin inhibitor induced nephrotoxicity.

Christopher J Benway1,2, John Iacomini1,2,3,4

  • 1Department of Integrative Physiology and Pathobiology, Tufts University School of Medicine, Boston, MA, USA.

American Journal of Transplantation : Official Journal of the American Society of Transplantation and the American Society of Transplant Surgeons
|September 20, 2017
PubMed
Summary

This study maps microRNA (miRNA)-messenger RNA (mRNA) interactions in cyclosporine-induced nephrotoxicity (CIN). We identified specific miRNA-mRNA changes and pathways, revealing potential targets to reduce kidney damage from calcineurin inhibitors.

Keywords:
basic (laboratory) research/sciencegenomicsimmunosuppression/immune modulationkidney failure/injurymolecular biology: mRNA/mRNA expressionmolecular biology: micro RNAtranslational research/science

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Area of Science:

  • Molecular Biology
  • Genomics
  • Nephrology

Background:

  • Calcineurin inhibitors (e.g., cyclosporine A) are crucial in transplantation but cause nephrotoxicity via unclear mechanisms, limiting their clinical application.
  • MicroRNAs (miRNAs) are key regulators of gene expression, but their specific role in calcineurin-induced nephrotoxicity (CIN) remains largely unexplored.
  • Understanding miRNA-mRNA interactions is vital for elucidating CIN pathogenesis and identifying therapeutic targets.

Purpose of the Study:

  • To construct a comprehensive miRNA-mRNA interaction map in the context of cyclosporine A (CsA)-induced nephrotoxicity (CIN).
  • To identify specific miRNAs and messenger RNAs (mRNAs) actively targeted by the RNA-induced silencing complex (RISC) during CsA treatment.
  • To explore the role of these miRNA-mRNA interactions in regulating gene pathways relevant to CIN.

Main Methods:

  • Utilized photoactivatable ribonucleoside-enhanced crosslinking and immunoprecipitation (PAR-CLIP) to capture Argonaute 2-bound RNAs in CsA-treated and control human proximal tubule cells.
  • Performed RNA sequencing (RNA-seq) on total RNA and RISC-associated RNAs to identify actively targeted miRNAs and mRNAs.
  • Conducted pathway enrichment analysis to determine canonical pathways regulated by miRNAs under CsA treatment.

Main Results:

  • Defined a specific miRNA-mRNA interaction map altered by CsA treatment, highlighting changes in post-transcriptional gene regulation.
  • Demonstrated that only a subset of total miRNAs and mRNAs are actively engaged in RISC, validating PAR-CLIP's precision in identifying functional interactions.
  • Identified calcineurin-independent regulation of JNK and p38 MAPKs through miRNA targeting of MAP3K1, offering new insights into CIN mechanisms.

Conclusions:

  • The generated miRNA-mRNA interaction map provides a novel resource for studying molecular pathways in CIN.
  • Specific miRNAs and gene pathways identified represent potential therapeutic targets for mitigating calcineurin-induced kidney damage.
  • This research deepens the understanding of miRNA-mediated gene regulation in the context of nephrotoxicity, paving the way for novel treatment strategies.