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Related Concept Videos

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.
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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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T Cell Types and Functions01:24

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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The Function of Ubiquitination in T-Cell Development.

Zhengcan Peng1, Huiyuan Zhang1, Hongbo Hu2,3

  • 1Center for Immunology and Hematology, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, China.

Advances in Experimental Medicine and Biology
|November 15, 2024
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Summary

Ubiquitination, a key cellular process, significantly impacts T cell development within the thymus. This review explores how ubiquitination regulates T cell maturation and function, ensuring immune system competence.

Keywords:
Negative and positive selectionT cell developmentThymic epithelial cell (TEC)Treg developmentUbiquitination

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • The thymus is a primary lymphoid organ crucial for T cell development.
  • T cell development involves stages like early thymic progenitors (ETPs) differentiating into CD4-CD8-, CD4+CD8+, and single-positive T cells.
  • Thymic epithelial cells (TEC), dendritic cells (DC), macrophages, and B cells support T cell maturation, including proliferation, T cell receptor (TCR) rearrangement, and selection processes.

Purpose of the Study:

  • To review and discuss the role of ubiquitination in regulating T cell development.
  • To highlight how ubiquitination influences key signaling pathways and cell functions during T cell maturation.

Main Methods:

  • This is a review article, synthesizing existing research.
  • It focuses on the post-translational modification of ubiquitination and its impact on T cell development.

Main Results:

  • Ubiquitination is a critical post-translational modification regulating signal transduction in biological processes.
  • Ubiquitination plays a role in T cell development by modulating key signaling pathways and the maturation/function of related cells.
  • Self-reactive thymocytes can differentiate into regulatory T cells (Tregs) under specific cellular interactions.

Conclusions:

  • Ubiquitination is a complex regulatory mechanism essential for normal T cell development in the thymus.
  • Understanding ubiquitination's role is vital for comprehending T cell maturation, immune competence, and self-tolerance.