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Human autoimmune anti-proteinase 3 scFv from a phage display library
R Finnern1, E Pedrollo, I Fisch
1Department of Transfusion Medicine, University of Cambridge, UK.
Clinical and Experimental Immunology
|February 1, 1997
Summary
This study introduces novel recombinant antibody fragments targeting proteinase 3 (PR3), crucial for diagnosing Wegener's granulomatosis. These fragments were derived from patient immune cells, offering a new diagnostic tool.
Area of Science:
- Immunology
- Autoimmunity
Background:
- Autoantibodies to proteinase 3 (PR3) are vital biomarkers for diagnosing and monitoring Wegener's granulomatosis.
- Recombinant antibody fragments offer potential for precise diagnostic and therapeutic applications.
Purpose of the Study:
- To describe the first recombinant human antibody fragments targeting the autoantigen PR3, generated from an immune B cell source.
- To characterize the antibody variable gene repertoire in splenic lymphocytes of a patient with systemic autoimmunity.
Main Methods:
- Phage display library construction from splenic lymphocytes of an autoimmune patient.
- Isolation and sequencing of antibody variable genes.
- Selection of single-chain variable fragment (scFv) specific to PR3.
Main Results:
- Successfully generated specific anti-PR3 scFv from a phage display library.
- Identified an over-representation of specific heavy chain variable domains in splenic lymphocytes compared to peripheral blood.
- Demonstrated that limited somatic mutation in selected scFv did not affect binding specificity.
Conclusions:
- Recombinant antibody fragments against PR3 can be effectively generated from patient immune B cells.
- The study provides insights into the antibody repertoire diversity in autoimmune diseases.
- These findings support the development of novel diagnostic and potentially therapeutic tools for Wegener's granulomatosis.