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Related Concept Videos

Tumor Immunotherapy01:27

Tumor Immunotherapy

659
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

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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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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Zeaxanthin augments CD8+ effector T cell function and immunotherapy efficacy.

Freya Q Zhang1, Jiacheng Li1, Rukang Zhang1

  • 1Department of Medicine, The University of Chicago, Chicago, IL 60637, USA.

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Zeaxanthin (ZEA), a nutrient from fruits and vegetables, boosts CD8+ T cell anti-tumor immunity. ZEA enhances T cell receptor signaling, improving immunotherapy efficacy against cancer.

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Area of Science:

  • Immunology
  • Nutrition Science
  • Oncology

Background:

  • Mechanisms of dietary components in anti-tumor immunity are not fully understood.
  • Zeaxanthin (ZEA) is a carotenoid known for eye health benefits.
  • Identifying novel immunomodulators from dietary sources is crucial for cancer therapy.

Purpose of the Study:

  • To identify dietary compounds that modulate anti-tumor immunity.
  • To investigate the immunomodulatory effects of zeaxanthin (ZEA) on CD8+ T cells.
  • To elucidate the mechanisms by which ZEA enhances anti-tumor responses.

Main Methods:

  • Co-culture-based screening using a blood nutrient compound library.
  • In vivo oral supplementation studies with ZEA and lutein (LUT).
  • Integrated multi-omics analysis to study intracellular signaling pathways.

Main Results:

  • Zeaxanthin (ZEA) enhances CD8+ T cell cytotoxicity against tumor cells.
  • Oral ZEA, but not LUT, improves anti-tumor immunity in vivo.
  • ZEA promotes T cell receptor (TCR) stimulation and intracellular signaling.
  • ZEA augments the efficacy of anti-PD1 immune checkpoint inhibitors and TCR gene-engineered T cells.

Conclusions:

  • Zeaxanthin (ZEA) possesses a previously unrecognized immunoregulatory function.
  • ZEA enhances anti-tumor immunity by improving CD8+ T cell function.
  • ZEA has translational potential as a dietary supplement to enhance cancer immunotherapy.