Transgelin induces dysfunction of fetal endothelial colony-forming cells from gestational diabetic pregnancies

Area of Science:

• Cardiovascular biology
• Developmental biology
• Cell biology

Background:

• Fetal exposure to gestational diabetes mellitus (GDM) increases children's risk of hypertension and cardiovascular disease.
• Impaired function of vascular progenitor cells, such as endothelial colony-forming cells (ECFCs), is a key mechanism linking GDM exposure to later cardiovascular complications.
• Previous studies showed GDM-exposed fetal ECFCs exhibit reduced vasculogenic potential and altered gene expression.

Purpose of the Study:

• To investigate the role of transgelin (TAGLN), an actin-binding protein, in the functional impairment of ECFCs exposed to GDM.
• To determine if elevated TAGLN expression in GDM-exposed ECFCs contributes to reduced network formation and migration.
• To assess whether TAGLN is necessary and/or sufficient to impair ECFC network formation.

Main Methods:

• TAGLN expression was reduced in ECFCs from GDM pregnancies and overexpressed in ECFCs from uncomplicated pregnancies.
• ECFC network formation, stability, migration, and alignment to laminar flow were evaluated.
• Functional assays were performed to assess the impact of altered TAGLN levels on ECFC behavior.

Main Results:

• Reducing TAGLN in GDM-exposed ECFCs improved network formation, stability, and migration.
• Overexpressing TAGLN in ECFCs from uncomplicated pregnancies decreased network formation, stability, migration, and alignment to laminar flow.
• These findings indicate TAGLN plays a critical role in mediating GDM-induced ECFC dysfunction.

Conclusions:

• Increased TAGLN expression in fetal ECFCs exposed to GDM contributes to vasculogenic dysfunction.
• TAGLN impairs ECFC migration, cell alignment, and network formation, underlying cardiovascular disease predisposition.
• Understanding these molecular mechanisms is crucial for developing strategies to prevent GDM-related cardiovascular complications.