Collagen turnover profiles in chronic kidney disease

Area of Science:

• Nephrology
• Biochemistry
• Pathology

Background:

• Renal fibrosis, a key feature of chronic kidney disease (CKD), arises from disrupted extracellular matrix homeostasis.
• Understanding collagen turnover is crucial for characterizing CKD progression and identifying therapeutic targets.

Purpose of the Study:

• To investigate collagen type I, III, IV, and VI turnover in non-dialysis CKD patients.
• To identify distinct patient clusters based on collagen remodeling profiles.
• To explore the relationship between collagen turnover and CKD severity.

Main Methods:

• Analysis of plasma and urinary peptides reflecting collagen formation and degradation.
• Patient stratification into clusters based on collagen turnover markers.
• Comparison of collagen profiles across different CKD stages and clusters.

Main Results:

• Four patient clusters were identified, with distinct collagen turnover patterns.
• Elevated collagen VI formation was observed in severe (Cluster 2) and moderate (Cluster 4) CKD.
• Plasma collagen IV degradation fragments were lower in severe CKD (Cluster 2).
• Urinary collagen III fragments showed a decreasing trend with increasing CKD severity.

Conclusions:

• CKD patients with similar kidney function can exhibit different collagen remodeling phenotypes.
• Collagen remodeling profiles may indicate varying disease activity and progression potential.
• Collagen turnover biomarkers could complement traditional markers for assessing renal function and disease status.