Affinity Purification and Comparative Biosensor Analysis of Citrulline-Peptide-Specific Antibodies in Rheumatoid Arthritis

Overview

Journal Int J Mol Sci

Publisher MDPI

Specialties Biochemistry
Chemistry
Molecular Biology

Date 2018 Jan 25

PMID 29361749

Citations 8

Authors

Eszter Szarka

Petra Aradi

Krisztina Huber

Judit Pozsgay

Lili Vegh

Anna Magyar

Gergo Gyulai

Gyorgy Nagy

Bernadette Rojkovich

Eva Kiss

Ferenc Hudecz

Gabriella Sarmay

Affiliations

Soon will be listed here.

Abstract

Background: In rheumatoid arthritis (RA), anti-citrullinated protein/peptide antibodies (ACPAs) are responsible for disease onset and progression, however, our knowledge is limited on ligand binding affinities of autoantibodies with different citrulline-peptide specificity.

Methods: Citrulline-peptide-specific ACPA IgGs were affinity purified and tested by ELISA. Binding affinities of ACPA IgGs and serum antibodies were compared by surface plasmon resonance (SPR) analysis. Bifunctional nanoparticles harboring a multi-epitope citrulline-peptide and a complement-activating peptide were used to induce selective depletion of ACPA-producing B cells.

Results: values of affinity-purified ACPA IgGs varied between 10 and 10 M and inversely correlated with disease activity. Based on their cross-reaction with citrulline-peptides, we designed a novel multi-epitope peptide, containing Cit-Gly and Ala-Cit motifs in two-two copies, separated with a short, neutral spacer. This peptide detected antibodies in RA sera with 66% sensitivity and 98% specificity in ELISA and was recognized by 90% of RA sera, while none of the healthy samples in SPR. When coupled to nanoparticles, the multi-epitope peptide specifically targeted and depleted ACPA-producing B cells ex vivo.

Conclusions: The unique multi-epitope peptide designed based on ACPA cross-reactivity might be suitable to develop better diagnostics and novel therapies for RA.

Citing Articles

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The peculiar features, diversity and impact of citrulline-reactive autoantibodies.

Raposo B, Klareskog L, Robinson W, Malmstrom V, Gronwall C Nat Rev Rheumatol. 2024; 20(7):399-416.

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Peptide-Coated Bacteriorhodopsin-Based Photoelectric Biosensor for Detecting Rheumatoid Arthritis.

Chen H, Tsai Y, Hsu C, Wang Y, Hsieh C, Chen J Biosensors (Basel). 2023; 13(10).

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Role of ceRNA network in inflammatory cells of rheumatoid arthritis.

He X, He H, Zhang Y, Wu T, Chen Y, Tang C Zhong Nan Da Xue Xue Bao Yi Xue Ban. 2023; 48(5):750-759.

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Absolute Quantitation of Serum Antibody Reactivity Using the Richards Growth Model for Antigen Microspot Titration.

Papp K, Kovacs A, Orosz A, Herincs Z, Randek J, Liliom K Sensors (Basel). 2022; 22(10).

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