Alpha 1 Antitrypsin Regulates Trophoblast Syncytialization and Inflammatory Factor Expression

Area of Science:

• Reproductive Biology
• Cell Biology
• Biochemistry

Background:

• Alpha1-antitrypsin (A1AT), a serine protease inhibitor, exhibits functions beyond protease inhibition.
• Altered A1AT expression is observed in pregnancy-induced hypertension, suggesting a role in placental development.
• Trophoblast syncytialization is crucial for placental formation and function.

Purpose of the Study:

• To investigate the role of A1AT in trophoblast syncytialization and inflammatory responses.
• To elucidate the molecular mechanisms by which A1AT influences placental development.
• To explore the potential link between A1AT dysfunction and pregnancy-associated disorders.

Main Methods:

• Primary trophoblasts were used to study A1AT expression via knockdown and overexpression.
• RNA sequencing was performed to analyze gene expression markers of syncytialization and inflammation.
• Immunohistochemistry localized A1AT protein in placental tissues.
• Pharmacological inhibitors of p38MAPK and JNK pathways were employed.

Main Results:

• A1AT knockdown upregulated FOSL1 and markers of syncytialization, including cell fusion.
• A1AT overexpression demonstrated opposite effects on syncytialization and FOSL1 expression.
• FOSL1 overexpression mimicked the effects of A1AT knockdown on syncytialization.
• Inhibitors of p38MAPK and JNK modulated inflammatory factors; p38MAPK inhibition suppressed FOSL1 expression.

Conclusions:

• A1AT negatively regulates inflammatory responses by controlling p38MAPK and JNK activation.
• p38MAPK mediates trophoblast syncytialization through FOSL1 expression.
• A1AT dysfunction is implicated in abnormal placental formation and pregnancy complications.