miR-519d downregulates LEP expression to inhibit preeclampsia development

Area of Science:

• Reproductive biology
• Molecular genetics
• Cell biology

Background:

• Preeclampsia (PE) is a pregnancy complication with significant maternal and fetal risks.
• The molecular mechanisms underlying PE, particularly the role of microRNAs in trophoblast function, require further elucidation.

Purpose of the Study:

• To investigate the role of microRNA (miR)-519d in trophoblast cells and preeclampsia (PE) development.
• To elucidate the underlying mechanism involving leptin (LEP) regulation by miR-519d.

Main Methods:

• Dual-luciferase reporter gene assay to confirm LEP regulation by miR-519d.
• Loss- and gain-of-function assays in HTR-8/SVneo cells to assess miR-519d and LEP roles in cell proliferation, migration, and invasion.
• CCK-8 assay, scratch test, Transwell invasion assay, and flow cytometry for cell behavior and apoptosis analysis.

Main Results:

• LEP expression was elevated, while miR-519d levels were suppressed in PE placenta samples compared to normal pregnancies.
• miR-519d directly targeted the 3' UTR of LEP, negatively correlating with LEP expression.
• Overexpression of miR-519d suppressed LEP expression, promoting trophoblast cell proliferation, migration, and survival while repressing apoptosis.

Conclusions:

• miR-519d targets LEP and downregulates its expression in trophoblast cells.
• The miR-519d/LEP axis plays a crucial role in regulating trophoblast function.
• Modulating miR-519d may offer a therapeutic strategy to inhibit preeclampsia development.