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Small-Molecule RORγt Antagonists: One Stone Kills Two Birds
1Molecular and Cellular Immunoregulation Unit, Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA; Institute of Systems Biomedicine, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China.
RORγt antagonists, used to suppress T helper 17 cells, also reduce self-reactive T cells in the thymus. This finding suggests potential new strategies for preventing autoimmune diseases.
Area of Science:
- Immunology
- Molecular Biology
- Autoimmunity
Background:
- Retinoic acid receptor-related orphan nuclear receptor γ (RORγt) is a key transcription factor in T cell differentiation.
- RORγt antagonists are primarily studied for their ability to suppress interleukin-17 (IL-17)-producing T helper (Th17) cells.
Purpose of the Study:
- To investigate the effects of RORγt inhibition on cells beyond Th17 cells, specifically in the thymus.
- To determine if RORγt inhibition in early T cell development impacts the T cell repertoire and autoimmunity.
Main Methods:
- Utilized small-molecule RORγt antagonists.
- Administered antagonists to CD4+CD8+ thymocytes (immature T cells in the thymus).
- Analyzed the resulting T cell repertoire and assessed susceptibility to autoimmunity.
Main Results:
- RORγt inhibition in CD4+CD8+ thymocytes led to a skewed T cell repertoire.
- This skewing resulted in a decreased frequency of self-reactive T cells.
- Mice treated with RORγt antagonists exhibited increased resistance to experimentally induced autoimmunity.
Conclusions:
- RORγt plays a critical role in shaping the T cell repertoire during thymic development.
- Inhibiting RORγt in thymocytes offers a novel approach to reducing self-reactive T cells.
- Targeting RORγt in the thymus may represent a therapeutic strategy for preventing or treating autoimmune diseases.
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