Complement factor H inhibits endothelial cell migration through suppression of STAT3 signaling

Area of Science:

• Vascular Biology
• Complement System
• Cell Signaling

Background:

• Complement factor H (CFH) is a key regulator of the complement system and interacts with the endothelium.
• Mutations in the CFH gene are linked to diseases characterized by excessive angiogenesis, but the mechanisms are unclear.

Purpose of the Study:

• To investigate the effects of CFH on endothelial cells and elucidate the underlying molecular mechanisms.
• To determine if CFH influences endothelial cell viability, proliferation, or migration.

Main Methods:

• Human umbilical vein endothelial cells (HUVECs) were co-cultured with supernatant from CFH-expressing HepG2 cells.
• Cell proliferation was assessed using CCK8 and MTT assays.
• Cell migration was evaluated via wound healing and Transwell assays, with gene and protein expression analyzed by RT-qPCR and Western blotting, respectively.

Main Results:

• CFH significantly inhibited HUVEC migration but did not affect cell viability or proliferation.
• CFH decreased STAT3 phosphorylation in HUVECs, without altering MAPK or TGF-β signaling pathways.
• CFH reduced the expression of vascular endothelial growth factor receptor 2 (VEGFR2), a downstream target of STAT3 involved in endothelial cell migration.

Conclusions:

• CFH inhibits endothelial cell migration, at least in part, through the downregulation of STAT3 signaling and VEGFR2 expression.
• These findings suggest that CFH may represent a novel therapeutic target for managing angiogenesis-related disorders.