miR-515-5p suppresses trophoblast cell invasion and proliferation through XIAP regulation in preeclampsia

Area of Science:

• Molecular Biology
• Biochemistry
• Reproductive Medicine

Background:

• MicroRNAs (miRNAs) are stable, secreted small non-coding RNAs involved in biological regulation.
• Aberrant miRNA expression is linked to various pathological conditions, making them potential disease biomarkers.
• Preeclampsia is a serious pregnancy complication with complex underlying molecular mechanisms.

Purpose of the Study:

• To investigate the role of miR-515-5p in preeclampsia pathogenesis.
• To identify miR-515-5p as a potential circulating biomarker for preeclampsia.
• To elucidate the molecular targets and functions of miR-515-5p in trophoblast cells.

Main Methods:

• Quantification of serum miR-515-5p levels in preeclampsia patients and normal pregnant women.
• Bioinformatics prediction and dual-luciferase reporter assays to identify miR-515-5p targets.
• In vitro studies using HTR-8/SVneo trophoblast cells to assess the functional impact of miR-515-5p overexpression on proliferation, invasion, and XIAP expression.
• Analysis of XIAP expression and epithelial-mesenchymal transition (EMT) markers in placental tissues.

Main Results:

• miR-515-5p was significantly upregulated in the serum of preeclampsia patients compared to controls.
• miR-515-5p was confirmed to directly target the 3'-untranslated region of the X-linked inhibitor of apoptosis protein (XIAP).
• Overexpression of miR-515-5p suppressed trophoblast cell proliferation and invasion.
• Decreased XIAP expression and reduced EMT were observed in preeclamptic placentas.

Conclusions:

• miR-515-5p plays a crucial role in preeclampsia pathogenesis by suppressing XIAP.
• The miR-515-5p/XIAP axis influences trophoblast cell behavior and EMT.
• Circulating miR-515-5p holds promise as a non-invasive biomarker for preeclampsia diagnosis.