PUM1 modulates trophoblast cell proliferation and migration through LRP6

Area of Science:

• Reproductive Biology
• Molecular Genetics
• Cell Biology

Background:

• Preeclampsia is a severe pregnancy complication linked to hypertension, posing risks for maternal health.
• Understanding the genetic factors in preeclampsia pathophysiology is crucial for developing effective treatments.
• Extravillous trophoblast cells (EVTs) play a vital role in placental development and are implicated in preeclampsia.

Purpose of the Study:

• To investigate the role and molecular mechanisms of pumilio RNA binding family member 1 (PUM1) in EVTs.
• To determine if PUM1 affects the expression of low-density lipoprotein receptor-related protein 6 (LRP6).
• To explore the potential of targeting PUM1 and LRP6 for preeclampsia management.

Main Methods:

• RNA pull-down, RNA immunoprecipitation, and luciferase reporter assays to verify protein-mRNA interactions.
• RT-qPCR and western blot assays to quantify mRNA and protein levels.
• Cellular assays including colony formation, proliferation, migration, and invasion assays following PUM1 or LRP6 manipulation.

Main Results:

• PUM1 directly binds to the 3'-untranslated region of LRP6 mRNA, reducing LRP6 expression at both mRNA and protein levels.
• Depletion of PUM1 enhanced EVT proliferation, migration, and invasion.
• Knockdown of LRP6 abolished the PUM1-depletion-induced enhancement of EVT functions.

Conclusions:

• PUM1 regulates EVT growth and mobility by modulating LRP6 expression.
• The PUM1-LRP6 axis is a key factor in EVT function relevant to preeclampsia.
• Modulating PUM1 and LRP6 levels presents a potential therapeutic strategy for preeclampsia.