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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.
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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
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Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
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The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
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Continuous requirement for the TCR in regulatory T cell function.

Andrew G Levine1, Aaron Arvey1, Wei Jin1

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Regulatory T cells (Treg cells) require T cell receptor (TCR) signaling for their function. This signaling is essential for maintaining Treg cell suppressor capacity, not just their differentiation.

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Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Biology

Background:

  • Foxp3(+) regulatory T cells (Treg cells) are crucial for maintaining immunological tolerance.
  • Deficiency in Treg cells leads to fatal multiorgan autoimmunity.
  • The role of T cell receptor (TCR) signaling in Treg cell function is largely unknown, despite its importance in Treg cell differentiation.

Purpose of the Study:

  • To investigate the role of TCR signaling in the functional maintenance of Treg cells.
  • To determine if TCR signaling impacts Treg cell suppressor capacity.

Main Methods:

  • Inducible ablation of the TCR in Treg cells.
  • Analysis of Foxp3 expression.
  • Assessment of Treg cell signature gene expression.
  • Evaluation of interleukin-2 (IL-2) sensing and consumption.
  • Transcriptional profiling to identify genes regulated by TCR signaling.

Main Results:

  • Inducible TCR ablation led to Treg cell dysfunction.
  • This dysfunction was not due to impaired Foxp3 expression, Treg signature genes, or IL-2 metabolism.
  • TCR signaling was essential for maintaining a subset of genes (25%) within the activated Treg cell transcriptional signature.

Conclusions:

  • TCR signaling plays a critical role in maintaining the suppressor function of Treg cells.
  • The TCR is required for the sustained expression of specific genes that underpin Treg cell effector functions.