Early-onset preeclampsia, plasma microRNAs, and endothelial cell function

Area of Science:

• Reproductive biology
• Molecular biology
• Genetics

Background:

• Preeclampsia is a pregnancy disorder characterized by hypertension, systemic inflammation, and endothelial dysfunction.
• MicroRNAs (miRNAs) are key regulators of gene expression involved in numerous physiological processes.
• Endothelial dysfunction is a central feature in preeclampsia pathophysiology.

Purpose of the Study:

• To compare plasma miRNA concentrations in women with preeclampsia, healthy pregnancies, and non-pregnant controls.
• To investigate the in vitro effect of significantly elevated plasma miRNAs in preeclampsia on endothelial cell function.

Main Methods:

• Plasma samples from early-onset preeclampsia, healthy pregnant, and non-pregnant women were analyzed using miRNA arrays and quantitative PCR.
• Endothelial cells were transfected with specific microRNA mimics (miR-574-5p, miR-1972, miR-4793-3p).
• Functional assays (wound healing, proliferation, tube formation) and gene expression analysis were performed on transfected cells.

Main Results:

• Plasma miRNA concentrations differed significantly between preeclampsia and healthy pregnancy groups.
• miR-574-5p and miR-1972 were significantly increased in preeclampsia.
• In vitro, these miRNAs reduced endothelial cell migration, proliferation, and tube formation, with miR-574-5p potentially downregulating the MKI67 proliferation marker.

Conclusions:

• Early-onset preeclampsia is associated with distinct plasma miRNA profiles compared to healthy pregnancies.
• miR-574-5p and miR-1972 may act as antiangiogenic factors by impairing endothelial cell proliferation and migration.
• These miRNAs represent potential therapeutic targets for preeclampsia.