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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Estrogens, particularly Estradiol (E2), are crucial for cardiovascular health, promoting endothelial repair through endothelial cell (EC) proliferation, migration, and angiogenesis.
  • MicroRNAs (miRNAs) are increasingly recognized for their roles in vascular function and mediating estrogenic actions.

Purpose of the Study:

  • To investigate the hypothesis that E2 exerts vascular protective effects by regulating specific miRNAs.
  • To elucidate the role of miR-193a-3p in E2-mediated endothelial cell function and angiogenesis.

Main Methods:

  • Screening of miRNAs affected by E2 in ECs.
  • In vitro studies using miR-193a-3p mimics and antimiRs to assess effects on EC proliferation, migration, and capillary formation.
  • Investigation of signaling pathways (PI3K/Akt-VEGF, ALK1/SMAD) involved in E2 and miR-193a-3p actions.
  • RT-PCR to determine the Estrogen Receptor (ER) subtype mediating E2's effect.
  • In vivo Matrigel assay in ovariectomized mice.
  • Analysis of plasma miR-193a-3p levels in in vitro fertilization (IVF) subjects.

Main Results:

  • E2 significantly downregulates miR-193a-3p levels in ECs.
  • Downregulation of miR-193a-3p by antimir mimicked E2's pro-angiogenic effects on ECs.
  • Restoring miR-193a-3p levels abrogated E2-induced EC growth and capillary formation.
  • miR-193a-3p inhibits angiogenesis by suppressing PI3K/Akt-VEGF and ALK1/SMAD signaling pathways.
  • E2 downregulates miR-193a-3p via ERα, acting post-transcriptionally.
  • In vivo studies confirmed miR-193a-3p's anti-angiogenic role and E2's ability to overcome it.
  • Lower plasma miR-193a-3p levels correlated with higher E2 levels in IVF subjects.

Conclusions:

  • miR-193a-3p acts as an endogenous inhibitor of angiogenesis in endothelial cells.
  • E2 promotes vascular repair and angiogenesis by downregulating miR-193a-3p expression through ERα.
  • Therapeutic modulation of miR-193a-3p (mimic or antimir) holds potential for treating conditions related to capillary dysfunction.