Using HLA-DR3-CBA/J Humanized Mice to Develop a Novel Genetic Model for Autoimmune Thyroiditis.

Area of Science:

• Immunology
• Endocrinology
• Genetics

Background:

• Experimental autoimmune thyroiditis serves as a crucial animal model for human Hashimoto's thyroiditis.
• Developing a humanized model expressing human HLA-DR3 can better simulate human autoimmune thyroiditis.
• Such a model is valuable for testing antigen-specific therapies.

Purpose of the Study:

• To develop a humanized mouse model of autoimmune thyroiditis using CBA/J-DR3 mice.
• To evaluate the immune response to human thyroglobulin (Tg) and its epitope (Tg.2098) in this model.
• To establish a platform for testing targeted therapies for autoimmune thyroiditis.

Main Methods:

• CBA/J-DR3 mice were generated and immunized with human thyroglobulin (Tg).
• T cell proliferation, anti-Tg antibody levels, and cytokine production were assessed.
• Thyroid histology and immunohistochemistry were performed to evaluate inflammation.

Main Results:

• Immunized mice exhibited significant T cell proliferation and elevated anti-Tg antibody levels.
• Enhanced reactivity to thyroid antigens and pro-inflammatory cytokine production were observed.
• Mild CD3-positive T-cell infiltration was detected in the thyroid tissues.

Conclusions:

• A novel humanized CBA/J-DR3 mouse model effectively mimics human Hashimoto's thyroiditis.
• The HLA-DR3 background and response to Tg/Tg.2098 increase translational relevance.
• This model is a valuable tool for studying thyroid disease pathogenesis and therapeutic interventions.