Peroxidasin expression patterns predict fibrosis and kidney function decline in IgA nephropathy

Area of Science:

• Nephrology
• Molecular Biology
• Pathology

Background:

• Peroxidasin (PXDN), a heme peroxidase, is involved in basement membrane assembly.
• PXDN is implicated in fibrotic processes, but its role in kidney disease is not well understood.

Purpose of the Study:

• To characterize PXDN expression in kidney biopsies from IgA nephropathy (IgAN) patients.
• To assess the association of PXDN with kidney fibrosis and function in IgAN.

Main Methods:

• Immunofluorescence staining of kidney biopsies to detect PXDN expression.
• Correlation analysis of PXDN levels with fibrosis markers (collagen III, collagen IV) and estimated glomerular filtration rate (eGFR).

Main Results:

• PXDN expression was reduced in proximal tubules and increased in the fibrotic interstitium of IgAN kidneys.
• PXDN correlated with collagen III deposition in glomeruli and interstitium.
• Higher PXDN expression in glomeruli, proximal tubules, and fibrotic interstitium was observed in patients with impaired kidney function (eGFR < 60 ml/min/1.73 m²).
• Glomerular PXDN inversely correlated with eGFR.

Conclusions:

• IgA nephropathy exhibits compartment-specific alterations in PXDN expression.
• PXDN is associated with interstitial fibrosis, collagen III deposition, and reduced kidney function in IgAN.
• PXDN may play a role in fibrotic remodeling and could be a therapeutic target for chronic kidney disease (CKD).