Cells (Apr 2022)

miR-324-5p and miR-30c-2-3p Alter Renal Mineralocorticoid Receptor Signaling under Hypertonicity

  • Thi An Vu,
  • Ingrid Lema,
  • Imene Hani,
  • Lydie Cheval,
  • Laura Atger-Lallier,
  • Vilayvane Souvannarath,
  • Julie Perrot,
  • Mélanie Souvanheuane,
  • Yannick Marie,
  • Sylvie Fabrega,
  • Anne Blanchard,
  • Jérôme Bouligand,
  • Peter Kamenickỷ,
  • Gilles Crambert,
  • Laetitia Martinerie,
  • Marc Lombès,
  • Say Viengchareun

DOI
https://doi.org/10.3390/cells11091377
Journal volume & issue
Vol. 11, no. 9
p. 1377

Abstract

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The Mineralocorticoid Receptor (MR) mediates the sodium-retaining action of aldosterone in the distal nephron, but mechanisms regulating MR expression are still poorly understood. We previously showed that RNA Binding Proteins (RBPs) regulate MR expression at the post-transcriptional level in response to variations of extracellular tonicity. Herein, we highlight a novel regulatory mechanism involving the recruitment of microRNAs (miRNAs) under hypertonicity. RT-qPCR validated miRNAs candidates identified by high throughput screening approaches and transfection of a luciferase reporter construct together with miRNAs Mimics or Inhibitors demonstrated their functional interaction with target transcripts. Overexpression strategies using Mimics or lentivirus revealed the impact on MR expression and signaling in renal KC3AC1 cells. miR-324-5p and miR-30c-2-3p expression are increased under hypertonicity in KC3AC1 cells. These miRNAs directly affect Nr3c2 (MR) transcript stability, act with Tis11b to destabilize MR transcript but also repress Elavl1 (HuR) transcript, which enhances MR expression and signaling. Overexpression of miR-324-5p and miR-30c-2-3p alter MR expression and signaling in KC3AC1 cells with blunted responses in terms of aldosterone-regulated genes expression. We also confirm that their expression is increased by hypertonicity in vivo in the kidneys of mice treated with furosemide. These findings may have major implications for the pathogenesis of renal dysfunctions, sodium retention, and mineralocorticoid resistance.

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