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Novel mechanism of the vascular protector prostacyclin: regulating microRNA expression

Anita Mohite1, Annirudha Chillar, Shui-Ping So

  • 1Center for Experimental Therapeutics and PharmacoInformatics and Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, Texas 77004, United States.

Biochemistry
|January 22, 2011
PubMed

Insights

Prostacyclin (PGI(2)) regulates microRNA (miRNA) expression via its receptors. This study demonstrates PGI(2) influences lipid deposition in adipocytes, suggesting a role in various diseases.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Vascular Biology

Background:

  • Prostacyclin (PGI(2)) is a crucial vascular protector derived from arachidonic acid (AA).
  • PGI(2) exerts its effects through the prostacyclin receptor (IP) and peroxisome proliferator-activated receptor gamma (PPARγ).

Purpose of the Study:

  • To investigate the role of PGI(2) in regulating microRNA (miRNA) expression.
  • To explore the impact of PGI(2)-mediated miRNA changes on adipocyte function and lipid deposition.

Main Methods:

  • Utilized a novel hybrid enzyme (COX-1-10aa-PGIS) to achieve stable, dominant PGI(2) production in mouse adipose-derived cells.
  • Conducted miRNA microarray analysis to identify differentially expressed miRNAs.
  • Administered IP and PPARγ receptor antagonists to assess their effect on miRNA expression.
  • Investigated the effect of PGI(2) upregulation on insulin-mediated lipid deposition in adipocytes.

Main Results:

  • Upregulation of PGI(2) significantly altered the expression of specific miRNAs (711, 148b, 744).
  • These miRNA changes were reversible with IP and PPARγ receptor antagonists.
  • Increased PGI(2) levels inhibited insulin-mediated lipid deposition in adipocytes.
  • A potential mechanism involving miRNA-mediated gene expression inhibition was proposed.

Conclusions:

  • PGI(2) regulates cellular miRNA expression through IP and PPARγ receptors.
  • PGI(2)-miRNA interactions may play a role in inhibiting lipid deposition in adipocytes.
  • This PGI(2)-miRNA regulatory axis could be relevant in pathophysiological processes including apoptosis, vascular inflammation, cancer, embryo implantation, and obesity.

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