A Naturally Occurring Urinary Collagen Type I Alpha 1-Derived Peptide Inhibits Collagen Type I-Induced Endothelial...

Area of Science:

• Biochemistry
• Cell Biology
• Extracellular Matrix Research

Background:

• Collagen type I (COL(I)) is crucial for the extracellular matrix (ECM), influencing cell signaling and migration.
• Degradation of collagen releases bioactive peptides (matrikines) that modulate cellular functions.
• Understanding the role of urinary collagen-derived peptides is essential for comprehending physiological processes.

Purpose of the Study:

• To investigate the biological effects of nine abundant urinary Collagen type I-derived peptides on human endothelial cells.
• To determine the impact of these peptides at physiological concentrations on cell migration and signaling pathways.
• To identify specific collagen-derived peptides that modulate endothelial cell behavior.

Main Methods:

• Cell migration assays were performed on human endothelial cells.
• Mass spectrometry-based proteomics was employed to analyze signaling pathways.
• Flow cytometry and AlphaFold 3 modeling were used to assess peptide-receptor interactions.

Main Results:

• Full-length Collagen type I enhanced endothelial cell migration.
• Peptide 1, containing DGEA and GRPGER motifs, inhibited Collagen type I-induced cell migration.
• Peptide 1 demonstrated interaction with integrin α2β1, confirmed by flow cytometry and AlphaFold 3 modeling.
• Proteomics revealed that Peptide 1 blocked Collagen type I-mediated phosphorylation events linked to integrin α2β1 activation.

Conclusions:

• Peptide 1 is a biologically active Collagen type I-derived peptide found in urine.
• This peptide modulates collagen-induced endothelial cell migration at physiological concentrations.
• The findings provide a basis for further research into Peptide 1's mechanisms and its role in urinary excretion.