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Isolation and characterization of autoantibodies against human cystatin C
Martyna Prądzińska1, Izabela Behrendt1, Marta Spodzieja1
1Faculty of Chemistry, Department of Biomedical Chemistry, University of Gdansk, Wita Stwosza 63, 80-952, Gdansk, Poland.
Insights
Researchers characterized natural antibodies against human cystatin C (hCC) in hereditary cystatin C amyloid angiopathy (HCCAA). This study identifies antibody binding sites, aiding in developing diagnostics and therapeutics for neurodegenerative diseases like HCCAA.
Area of Science:
- Neuroimmunology
- Protein Chemistry
- Genetics
Background:
- Hereditary cystatin C amyloid angiopathy (HCCAA) is a severe neurodegenerative disorder caused by a specific mutation in the cystatin C gene.
- Naturally occurring antibodies against cystatin C (hCC) are being explored for immunotherapeutic strategies against HCCAA.
- Autoantibodies are gaining attention as potential diagnostic markers and therapeutic agents for protein aggregation in neurodegenerative diseases.
Purpose of the Study:
- To characterize natural anti-hCC antibodies isolated from human serum.
- To identify the specific binding sites (epitopes) of these natural antibodies on hCC.
- To explore the potential of these antibodies for diagnostic and therapeutic applications in amyloidosis.
Main Methods:
- Isolation of natural anti-hCC antibodies from human serum IgG using affinity chromatography.
- Electrophoresis (1-D and 2-D) to analyze antibody characteristics.
- Mass spectrometry to determine Fc-glycan status and identify antibody-bound hCC fragments.
- Comparison of experimentally identified epitopes with theoretically predicted ones.
Main Results:
- Isolated natural antibodies (NAbs) against hCC were found to be a polyclonal mixture.
- Electrophoretic analysis did not allow classification into specific IgG types.
- Mass spectrometry identified specific hCC fragments recognized by the NAbs.
- Fc-glycan analysis provided insights into antibody glycosylation.
Conclusions:
- Characterization of natural anti-hCC antibodies provides insights into their polyclonal nature and binding specificities.
- Identification of hCC fragments recognized by NAbs is crucial for understanding HCCAA pathogenesis.
- This research contributes to the development of novel diagnostic tools and therapeutic strategies for various forms of amyloidosis.
Abstract:
Hereditary cystatin C amyloid angiopathy (HCCAA) is a severe neurodegenerative disorder related to the point mutation in cystatin C gene resulting in human cystatin C (hCC) L68Q variant. One of the potential immunotherapeutic approaches to HCCAA treatment is based on naturally occurring antibodies against cystatin C. A recent growing interest in autoantibodies, especially in the context of neurodegenerative diseases, emerges from their potential use as valuable diagnostic markers and for controlling protein aggregation. In this work, we present characteristics of natural anti-hCC antibodies isolated from the IgG fraction of human serum by affinity chromatography. The electrophoresis (1-D and 2-D) results demonstrated that the isolated NAbs are a polyclonal mixture, but their electrophoretic properties did not allow to classify the new autoantibodies to any particular type of IgG. The Fc-glycan status of the studied autoantibodies was assessed using mass spectrometry analysis. For the isolated NAbs, the epitopic fragments in hCC sequence were identified by MS-assisted proteolytic excision of the immune complex and compared with the ones predicted theoretically. The knowledge of hCC fragments binding to NAbs and other ligands may contribute to the search for new diagnostic methods for amyloidosis of different types and the search for their treatment.
