HIF-1α Stabilization Increases miR-210 Eliciting First Trimester Extravillous Trophoblast Mitochondrial Dysfunction

Area of Science:

• Reproductive biology
• Molecular genetics
• Maternal-fetal medicine

Background:

• Preeclampsia is linked to first-trimester placental dysfunction.
• MicroRNA-210 (miR-210) is elevated in preeclamptic placentas, but its role is unclear.
• Understanding miR-210's impact on early placental function is crucial for preeclampsia research.

Purpose of the Study:

• Identify miR-210 targets in first-trimester extravillous trophoblasts (EVTs).
• Investigate functional pathways affected by elevated miR-210 in early pregnancy.
• Elucidate miR-210's contribution to preeclampsia pathogenesis.

Main Methods:

• Isolated first-trimester EVTs were exposed to cobalt chloride (CoCl2) to mimic hypoxia.
• miR-210 expression, HIF1α levels, and EVT invasion were measured.
• RNA sequencing identified miR-210 targets, and mitochondrial function was assessed via respirometry.

Main Results:

• CoCl2 exposure increased miR-210 and HIF1α, reducing EVT invasion.
• RNA array revealed 49 altered genes in miR-210 transfected EVTs, with key mitochondrial genes repressed.
• miR-210 transfection decreased mitochondrial respiration (maximal, complex II, and complex I+II).

Conclusions:

• miR-210 overexpression significantly alters first-trimester trophoblast function.
• Elevated miR-210 impairs EVT mitochondrial function during early pregnancy.
• Mitochondrial dysfunction driven by miR-210 may contribute to preeclampsia pathology.