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Related Experiment Videos

Common epitopes in Clq and collagen type II.

H P Heinz1, K Rubin, A B Laurell

  • 1Institut für Medizinische Mikrobiologie, Johannes-Gutenberg-Universität Mainz, F.R.G.

Molecular Immunology
|February 1, 1989
PubMed
Summary
This summary is machine-generated.

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A shared epitope between collagen type II and complement factor Clq was identified using a monoclonal anti-collagen type II antibody. This finding suggests a potential link to rheumatoid arthritis pathogenesis.

Area of Science:

  • Immunology
  • Biochemistry
  • Rheumatology

Background:

  • Collagen type II is a major component of cartilage.
  • Complement factor Clq plays a role in immune responses.
  • Both collagen type II antibodies and free Clq are found in rheumatoid arthritis.

Purpose of the Study:

  • To investigate a potential shared epitope between collagen type II and complement factor Clq.
  • To explore the implications of this epitope for rheumatoid arthritis.

Main Methods:

  • Specific binding assays using monoclonal anti-collagen type II antibody (MAb B1) and purified Clq.
  • Hemolytic assays and enzyme-linked biotin-avidin assays.
  • Binding studies with Clq fragments and heat-aggregated IgG.

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Main Results:

  • A monoclonal anti-collagen type II antibody (MAb B1) specifically bound to purified Clq.
  • The epitope recognized by MAb B1 is located in the collagen-like region of Clq.
  • Binding affinity increased upon Clq interaction with aggregated IgG, suggesting epitope demasking.
  • MAb B1 did not bind to the macromolecular Cl complex.

Conclusions:

  • A common epitope exists between collagen type II and Clq.
  • This epitope is accessible on free Clq, particularly after interaction with aggregated IgG.
  • The findings suggest a potential pathogenetic role in rheumatoid arthritis due to the presence of anti-collagen type II antibodies and free Clq.