WNT signaling is required for peritoneal membrane angiogenesis

Area of Science:

• Cell Biology
• Molecular Biology
• Nephrology

Background:

• The wingless-type (WNT) signaling pathway regulates cell growth, differentiation, and tissue repair.
• WNT signaling is implicated in wound healing and fibrosis, but its role in peritoneal membrane injury remains unclear.

Purpose of the Study:

• To investigate the role of the WNT signaling pathway in peritoneal membrane injury.
• To assess WNT pathway activation in peritoneal dialysis (PD) patients and a mouse model of peritoneal fibrosis.
• To evaluate the therapeutic potential of WNT inhibition in peritoneal fibrosis.

Main Methods:

• Assessed WNT1 protein and WNT gene expression in PD patients' peritoneal effluents and mesothelial cells.
• Utilized a transforming growth factor-β (TGF-β)-induced mouse model of peritoneal fibrosis.
• Administered WNT pathway inhibitors (β-catenin inhibitor ICG-001, DKK-1) to assess effects on fibrosis, angiogenesis, and epithelial-mesenchymal transition.

Main Results:

• WNT1 and WNT2 gene expression correlated with peritoneal membrane solute transport in PD patients.
• TGF-β-induced peritoneal fibrosis in mice showed increased WNT2 and WNT4 expression.
• WNT inhibition attenuated peritoneal fibrosis, angiogenesis, and vascular endothelial growth factor, while blocking epithelial-mesenchymal transition and increasing E-cadherin.

Conclusions:

• WNT signaling is active in experimental peritoneal fibrosis.
• WNT1 expression is linked to peritoneal membrane solute transport in PD patients.
• Targeting the WNT pathway offers a potential therapeutic strategy for peritoneal membrane injury.