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Generation of Two-color Antigen Microarrays for the Simultaneous Detection of IgG and IgM Autoantibodies
Published on: September 15, 2016
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A Contra Capture Protein Array Platform for Studying Post-translationally Modified (PTM) Auto-antigenomes.
Kailash Karthikeyan1, Kristi Barker1, Yanyang Tang1
1From the ‡Biodesign Institute, Center for Personalized Diagnostics, Arizona State University, Tempe, Arizona 85287;
Molecular & Cellular Proteomics : MCP
|May 4, 2016
Summary
A new protein array platform identifies novel autoantigens in rheumatoid arthritis (RA) by analyzing antibody responses to citrullinated proteins. This technology aids in understanding autoimmune disease mechanisms and discovering new biomarkers.
Area of Science:
- Biochemistry
- Immunology
- Proteomics
Background:
- Aberrant protein modifications are implicated in disease pathogenesis and trigger specific antibody responses.
- Existing methods for assessing protein immunogenicity are often laborious, requiring individual protein expression, purification, and modification.
Purpose of the Study:
- To develop and validate a novel protein array platform for parallel assessment of protein immunogenicity.
- To identify novel citrullinated autoantigens and characterize antibody reactivity patterns in rheumatoid arthritis (RA).
Main Methods:
- Developed a high-throughput protein array platform enabling parallel protein modification and immunogenicity assessment.
- Analyzed antibody responses to approximately 190 citrullinated proteins in 20 RA patients.
- Validated novel autoantigens and identified immune-dominant epitopes for citrullinated antigens.
Main Results:
- Observed distinct antibody reactivity profiles in both anticyclic citrullinated peptide assay positive (CCP+) and CCP- RA patients.
- Identified antibodies against known citrullinated autoantigens.
- Discovered and validated five novel citrullinated autoantigens (SPP1, FEN1, IGFBP6, IGF1, STC2) in RA patients.
Conclusions:
- The developed protein array platform efficiently identifies novel autoantigens and characterizes immune responses to post-translationally modified proteins.
- This platform facilitates a broader investigation of autoantigens in autoimmune diseases.
- The findings contribute to a deeper understanding of RA pathogenesis and biomarker discovery.
