Autoepitope Mapping of the Centrosome Autoantigen PCM-1 Using Scleroderma Sera with Anticentrosome Autoantibodies

Document Type

Article

Publication Title

Autoimmunity

Abstract

We previously characterized a scleroderma serum (serum 1) containing autoantibodies against centrosome autoantigens that have been named PCM-1, PCM-2, and PCM-3. In this study, we analyzed another sclerodoma serum (serum 2) reactive with centrosome autoantigens of identical molecular weights to those recognized by serum 1. To further analyze the autoepitope domains in PCM-1 recognized by the autoantibodies present in scleroderma sera, cDNAs encoding different portions of the PCM-1 autoantigen were expressed in bacteria as fusion proteins. The immunoreactivity of the fusion proteins to the scleroderma sera was assayed by immunoblot analysis. Two regions containing autoepitope domains reactive with both sera were identified in the PCM-1 molecule. One is between amino acids 312–706 of the PCM-1 autoantigen, and the other is localized between amino acids 1,433–1,787, indicating that the immune response is oligoclonal. The results are important to clarify the mechanism of induction of anticentrosome autoantibodies. The potential diagnostic and prognostic significance of the autoantibodies for subgroups of scleroderma is discussed.

First Page

219

Last Page

228

DOI

10.3109/08916939508995320

Publication Date

1995

Department

College of Medicine

Creative Commons License

Creative Commons Attribution-NonCommercial 4.0 International License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License

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