Reduction in experimental autoimmune thyroiditis by IgG Fc fragments bearing regRF epitopes

Previously, we identified a new immunoregulatory factor, the production of which provides rats with resistance to certain experimental autoimmune diseases. It has been named regulatory rheumatoid factor (regRF). RegRF inhibits the expansion of CD4 T lymphocytes by killing activated cells. CD4 T cell...

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Veröffentlicht in:Immunologic research 2023-02, Vol.71 (1), p.83-91
Hauptverfasser: Beduleva, Liubov, Sidorov, Alexandr, Terentiev, Alexey, Varaksin, Viktor, Fomina, Kseniya, Menshikov, Igor
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container_start_page 83
container_title Immunologic research
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creator Beduleva, Liubov
Sidorov, Alexandr
Terentiev, Alexey
Varaksin, Viktor
Fomina, Kseniya
Menshikov, Igor
description Previously, we identified a new immunoregulatory factor, the production of which provides rats with resistance to certain experimental autoimmune diseases. It has been named regulatory rheumatoid factor (regRF). RegRF inhibits the expansion of CD4 T lymphocytes by killing activated cells. CD4 T cells are essential for antibody production against a majority of antigens and for the generation of cytotoxic T cells; therefore, regRF is an attractive therapeutic biotarget for T-cell and antibody-mediated autoimmune diseases. RegRF is anti-idiotypic antibodies that have a shared paratope in addition to an individual paratope. Epitopes specific to the shared regRF paratope (regRF epitopes) can be obtained on conformers of IgG Fc fragments. Immunization with Fc fragments carrying regRF epitopes reduces rat collagen–induced arthritis and diminishes experimental autoimmune encephalomyelitis. The aim of this study was to determine whether IgG Fc fragments bearing regRF epitopes suppress experimental autoimmune thyroiditis (EAT). Four weeks after EAT induction, rats were immunized with IgG Fc fragments exhibiting regRF epitopes. Histology studies of the thyroid were performed 4 weeks later. Thyroid function and other parameters were also evaluated. Treatment of rats with Fc fragments bearing regRF epitopes decreased the number of rats affected by EAT, significantly decreased the extent of thyroid damage, prevented thyroid metaplasia, and restored normal thyroid hormone production. Therefore, RegRF is a promising biotarget in autoimmune thyroiditis, and Fc fragments bearing regRF epitopes are a potential therapeutic agent for that condition.
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subjects Allergology
Animals
Antibodies
Antigens
Arthritis
Autoimmune diseases
Biomedical and Life Sciences
Biomedicine
CD4 antigen
Chemical compounds
Collagen
Cytotoxicity
Damage prevention
Disease Models, Animal
Epitopes
Experimental allergic encephalomyelitis
Experimental autoimmune thyroiditis
Fragments
Hashimoto Disease - immunology
Hashimoto Disease - therapy
Histology
Immunization
Immunoglobulin Fc Fragments - therapeutic use
Immunoglobulin G
Immunology
Immunoregulation
Internal Medicine
Lymphocytes
Lymphocytes T
Medicine/Public Health
Metaplasia
Original Article
Pharmacology
Rats
Rheumatoid factor
Rheumatoid Factor - immunology
Thyroid
Thyroid gland
Thyroiditis
Thyroiditis, Autoimmune - therapy
title Reduction in experimental autoimmune thyroiditis by IgG Fc fragments bearing regRF epitopes
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