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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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Tumor Immunotherapy01:27

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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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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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B Cell Activation and Differentiation01:24

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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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Cytotoxic T Cells-mediated Immune Response01:27

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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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Related Experiment Video

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Adenoviral Transduction of Naive CD4 T Cells to Study Treg Differentiation
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Uncoupling T-cell expansion from effector differentiation in cell-based immunotherapy.

Joseph G Crompton1,2,3, Madhusudhanan Sukumar1, Nicholas P Restifo1

  • 1Surgery Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.

Immunological Reviews
|December 17, 2013
PubMed
Summary
This summary is machine-generated.

Adoptive cellular immunotherapy (ACT) shows promise for cancer treatment. Enhancing ACT efficacy requires understanding how T cell expansion and differentiation are coupled to maintain cell potency for tumor eradication.

Keywords:
CD8+ T cellsT-cell based-therapyadoptive cell transferadoptive cellular immunotherapyeffector differentiationreplicative senescence

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Area of Science:

  • Immunology
  • Cancer Biology
  • Cellular Therapy

Background:

  • Adoptive cellular immunotherapy (ACT) offers potential curative treatment for advanced cancers.
  • Tumor eradication in preclinical models and humans correlates with high cell dose and minimally differentiated T cells possessing replicative capacity and multipotency.
  • Successful ACT may necessitate transferring both immediate cytolytic effector cells and self-renewing tumor-specific cells to sustain progeny production for complete tumor elimination.

Purpose of the Study:

  • To investigate the physiological mechanisms coupling cell expansion and differentiation in CD8(+) T cells.
  • To identify strategies for improving ACT efficacy by optimizing T cell expansion and differentiation.
  • To address the limitations of current in vitro methods that couple clonal expansion with effector differentiation.

Main Methods:

  • The study focuses on understanding the physiological mechanisms governing CD8(+) T cell expansion and differentiation.
  • While specific experimental methods are not detailed in the abstract, the research implies in vitro cell culture and analysis of T cell phenotypes.
  • The core approach involves investigating the biological coupling between cell proliferation and the development of effector functions.

Main Results:

  • Current in vitro expansion methods face challenges in maintaining a minimally differentiated T cell phenotype due to the inherent coupling of clonal expansion and effector differentiation.
  • A correlation exists between tumor eradication and the dose of adoptively transferred cells, as well as their differentiation state.
  • The study speculates that sustained ACT response requires cells with both immediate effector function and self-renewal capacity.

Conclusions:

  • A deeper understanding of the physiological mechanisms that link CD8(+) T cell expansion and differentiation is crucial.
  • Optimizing these mechanisms could significantly enhance the therapeutic efficacy of adoptive cellular immunotherapy.
  • Future research should focus on overcoming the limitations of current cell expansion techniques to improve ACT outcomes.