Distinct TYRO3 and PROS1 expression levels contribute to preeclampsia pathogenesis

Area of Science:

• Obstetrics and Gynecology
• Immunology
• Cell Biology

Background:

• Preeclampsia (PE) is a severe pregnancy complication linked to inflammation and immune responses.
• TYRO3 and PROS1 are proteins involved in clearing apoptotic cells and suppressing inflammation.
• Dysregulation of TYRO3/PROS1 signaling is hypothesized to contribute to PE development.

Purpose of the Study:

• To investigate the role of TYRO3/PROS1 signaling in preeclampsia.
• To compare TYRO3 and PROS1 expression and localization in healthy and preeclamptic placentae.

Main Methods:

• Analysis of placental tissue morphology (H&E staining).
• Quantification of TYRO3, MERTK, PROS1, and GAS6 mRNA levels via qPCR.
• Immunohistochemical (IHC) staining to determine TYRO3 and PROS1 protein localization and expression.

Main Results:

• Increased mRNA levels of TYRO3, MERTK, PROS1, and GAS6 were found in preeclamptic placentae (PP) compared to healthy placentae (HP).
• TYRO3 protein expression was elevated in PP, localized in extravillous trophoblast (EVT) and syncytiotrophoblast (SCT) cells.
• PROS1 was present in HP fetal vessels but absent in PP; reduced PROS1 was noted in the PE cytotrophoblast layer.

Conclusions:

• Altered TYRO3/PROS1 signaling is implicated in PE pathogenesis.
• Reduced PROS1 in PE placentae may compromise the blood-placental barrier and suggest complement activation/thrombosis.
• TYRO3, MERTK, PROS1, and GAS6 may play a role in regulating inflammation, apoptosis, thrombosis, and barrier function in PE.