The TGF-β/UCHL5/Smad2 Axis Contributes to the Pathogenesis of Placenta Accreta

Area of Science:

• Obstetrics and Gynecology
• Cell Biology
• Molecular Biology

Background:

• Placenta accreta is a high-risk obstetric condition with unknown pathogenesis.
• Trophoblast invasiveness and angiogenic potential are key factors in placenta accreta development.

Purpose of the Study:

• To identify factors contributing to trophoblast invasiveness and angiogenic potential in placenta accreta.
• To investigate the role of the transforming growth factor (TGF)-β1-Smad pathway and UCHL5 inhibition in trophoblast function.

Main Methods:

• Utilized JEG-3 and HTR-8/SVneo cell lines.
• Inhibited ubiquitinating enzyme UCHL5 using bAP15 after TGF-β1 stimulation.
• Assessed trophoblast invasiveness and angiogenic potential, including downstream signaling pathways (Smad, ERK) and vascular endothelial growth factor secretion.

Main Results:

• UCHL5 inhibition decreased TGF-β1-induced Smad2 activation and extravillous trophoblast invasiveness.
• Simultaneous activation of Smad1/5/9 and extracellular signal-regulated kinase (ERK) pathways was observed.
• Trophoblast culture supernatant impaired human umbilical vein endothelial cell vasculogenic potential.

Conclusions:

• Smad2 contributes to extravillous trophoblast invasiveness.
• The ERK and Smad1/5/9 pathways may regulate the TGF-β1-Smad pathway in extravillous trophoblasts.
• Abnormal trophoblast invasive and angiogenic capacities, driven by TGF-β1-Smad and ERK pathway interactions, underlie placenta accreta pathogenesis.