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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
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Inhibition of RORγT Skews TCRα Gene Rearrangement and Limits T Cell Repertoire Diversity.

Yanxia Guo1, Kenzie D MacIsaac2, Yi Chen1

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RORγT regulates thymocyte survival and development. Inhibiting RORγT impacts T-cell receptor selection and diversity, offering a new strategy for treating autoimmune diseases like encephalomyelitis.

Keywords:
RORγTT cell repertoireautoimmunityexperimental autoimmune encephalomyelitisexperimental psoriasissmall-molecule antagonistthymopoiesis

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Area of Science:

  • Immunology
  • Molecular Biology
  • Autoimmunity

Background:

  • RORγT (Retinoid-related Orphan Receptor Gamma T) is a transcription factor crucial for thymopoiesis and Th17 cell function.
  • RORγT antagonists are being developed for autoimmune diseases, but their impact on thymocyte development is not fully understood.

Purpose of the Study:

  • To investigate the role of RORγT in thymocyte development beyond its known function in DP thymocyte survival.
  • To determine the effects of RORγT inhibition on T-cell receptor (TCR) selection and the potential therapeutic implications for autoimmunity.

Main Methods:

  • Pharmacological inhibition of RORγT in a mouse model.
  • Analysis of thymocyte migration, proliferation, and gene expression.
  • Assessment of TCRα gene rearrangement and T-cell repertoire diversity.
  • Evaluation of experimental autoimmune encephalomyelitis (EAE) development.

Main Results:

  • RORγT regulates thymocyte migration, proliferation, and TCRα selection, in addition to DP thymocyte survival.
  • Pharmacological RORγ inhibition skewed TCRα gene rearrangement and reduced T-cell repertoire diversity.
  • RORγT inhibition suppressed the development of autoimmune encephalomyelitis.

Conclusions:

  • RORγT plays a multifaceted role in T-cell development within the thymus.
  • Targeting RORγT impacts both Th17 cell function and the central T-cell repertoire, offering a dual therapeutic approach for autoimmune diseases.
  • Understanding RORγT's broader functions provides new insights into T-cell biology and autoimmune disease pathogenesis.