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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.
Naive T cells that have not yet encountered an antigen express two primary CD...
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T Cell Types and Functions01:24

T Cell Types and Functions

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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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Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

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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.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
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Tumor Immunotherapy01:27

Tumor Immunotherapy

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Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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YTHDF2 upregulation and subcellular localization dictate CD8 T cell polyfunctionality in anti-tumor immunity.

Haiyan Zhang1, Xiaojing Luo2,3, Wei Yang2,4

  • 1Cancer Center, Faculty of Health Sciences, University of Macau, Macau SAR, China; MOE Frontier Science Center for Precision Oncology, University of Macau, Macau, SAR, China.

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|November 5, 2024
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The N6-methyladenosine (m6A) reader YTHDF2 enhances CD8 T cell anti-tumor immunity by regulating RNA synthesis and chromatin. Its loss impairs tumor response, but combination therapy can restore efficacy.

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Area of Science:

  • Immunology
  • Epigenetics
  • Molecular Biology

Background:

  • RNA methylation, specifically N6-methyladenosine (m6A), is crucial for immune cell function.
  • The role of m6A RNA readers in CD8 T cell anti-tumor activity remains largely unexplored.

Purpose of the Study:

  • To investigate the function of the m6A reader YTHDF2 in CD8 T cell anti-tumor immunity.
  • To elucidate the mechanisms by which YTHDF2 influences T cell activity and tumor progression.

Main Methods:

  • Analysis of YTHDF2 expression in CD8 T cells.
  • Studies on YTHDF2 knockout mouse models and human samples.
  • Investigation of YTHDF2's interaction with transcription factors and its role in RNA synthesis and chromatin remodeling.

Main Results:

  • YTHDF2 is highly expressed in effector CD8 T cells and facilitates nascent RNA synthesis via m6A recognition.
  • Loss of YTHDF2 impairs anti-tumor immunity, leading to tumor progression and resistance to PD-1 blockade.
  • YTHDF2 promotes T cell polyfunctionality by orchestrating chromatin changes and interacting with IKZF1/3.

Conclusions:

  • YTHDF2 is a key regulator of CD8 T cell anti-tumor immunity, coordinating epigenetic and transcriptional programs.
  • Targeting YTHDF2 or its interacting partners, like IKZF1/3 with lenalidomide, can restore anti-tumor efficacy in deficient T cells and inform therapeutic strategies.