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Related Concept Videos

Immunodeficiency Diseases01:25

Immunodeficiency Diseases

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Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
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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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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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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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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

Updated: Sep 18, 2025

Measuring Mitochondrial Function of Na&#239;ve and Effector CD8 T Cells
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Measuring Mitochondrial Function of Naïve and Effector CD8 T Cells

Published on: March 28, 2025

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Iron deficiency causes aspartate-sensitive dysfunction in CD8+ T cells.

Megan R Teh1,2, Nancy Gudgeon3, Joe N Frost4

  • 1MRC Translational Immune Discovery Unit, Radcliffe Department of Medicine, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK. mteh@cemm.oeaw.ac.at.

Nature Communications
|June 20, 2025
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Summary
This summary is machine-generated.

Iron deficiency stalls CD8+ T cell proliferation by disrupting mitochondrial metabolism. Supplying aspartate can rescue T cell expansion and function, offering a potential therapeutic strategy for immune impairment.

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Area of Science:

  • Immunology
  • Cellular Metabolism
  • Nutritional Biochemistry

Background:

  • Iron is essential for cellular metabolism and immune function.
  • Iron deficiency affects over a billion people globally, impairing immunity.
  • The precise impact of iron deprivation on CD8+ T cell function is not well understood.

Purpose of the Study:

  • To investigate how low iron availability affects CD8+ T cell metabolism and function.
  • To elucidate the molecular mechanisms underlying immune impairment in iron deficiency.

Main Methods:

  • Multi-omic analysis (genomics, transcriptomics, proteomics).
  • Metabolic labeling techniques.
  • Assessment of mitochondrial function and cellular proliferation.

Main Results:

  • Iron limitation significantly impairs CD8+ T cell proliferation and mitochondrial membrane potential.
  • TCA cycle metabolism is altered, with a shift towards a reductive trajectory.
  • Aspartate accumulates but is not utilized for nucleotide synthesis due to mitochondrial dysfunction.
  • Exogenous aspartate partially rescues CD8+ T cell expansion and function.

Conclusions:

  • Iron scarcity creates a metabolic bottleneck in mitochondria, hindering CD8+ T cell function.
  • Aspartate supplementation can bypass this bottleneck, restoring some immune cell capabilities.
  • These findings provide mechanistic insights into immune dysfunction caused by iron deficiency.