Journal: PLOS ONE
Article Title: Serum Col3-4: A new type III and IV collagen biochemical marker of synovial tissue turnover in patients with rheumatoid arthritis
doi: 10.1371/journal.pone.0282954
Figure Lengend Snippet: The graph shows the competitive inhibitions between Col3-4 peptide, standard of ELISA with the following derived peptides for binding to the ELISA antibody 1) extended Col3-4 peptide (Col3-4 peptide + 1 amino acid), 2) shortened Col3-4 peptide (Col3-4 peptide—1 amino acid), 3) non-hydroxylated Col3-4 peptide (Col3-4 non-hydroxylated peptide), 4) unrelated type III peptide (Col3(α1)-Col3-4 unrelated peptide), 5) homologous type IV (α5) collagen peptide (Col4(α5)-Col3-4 homologous peptide), 6) homologous type IX (α3) collagen peptide (Col9(α3)-Col3-4 homologous peptide), 7) homologous type IV (α1) collagen peptide (Col4(α1)-Col3-4 homologous peptide). The graph shows also the recognition of the antibody with intact type III (α1) collagen (Native Col3 (α1)) and type IV (α5) collagen (Recombinant Col4 (α5). Y-axis shows the relative binding of the antibody at different concentrations of each molecule (B) expressed as a percentage of the binding with no competitor peptide (B0). The x-axis shows the molar concentration of each peptide. In brackets are the immunoreactive peptides.
Article Snippet: Briefly, 200μg of native human type III collagen and 50μg of recombinant type IV (α5) collagen (Aviva Systems Biology Corporation, CA, US) were incubated in test-tubes for 48h at 37°C with 5μg of active human recombinant MMP-9 (Merck, Saint-Quentin-Fallavier, France) in MMP buffer.
Techniques: Enzyme-linked Immunosorbent Assay, Derivative Assay, Binding Assay, Recombinant, Concentration Assay