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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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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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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Related Experiment Video

Updated: Sep 22, 2025

Quantitative Imaging of Lineage-specific Toll-like Receptor-mediated Signaling in Monocytes and Dendritic Cells from Small Samples of Human Blood
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Transcriptomic perspectives of memory-like NK cells and aging.

Dandan Wang1,2, Subramaniam Malarkannan3,4,5,6

  • 1Blood Research Institute, Versiti Inc, 8727 Watertown Plank Rd, Milwaukee, WI, 53226, USA.

Genome Medicine
|May 24, 2022
PubMed
Summary

A unique memory-like natural killer (NK) cell subset increases with age and correlates with severe COVID-19. Understanding this NK cell subset

Keywords:
Memory-like NK cells, Aging, Inflammaging, HCMV, COVID-19

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Area of Science:

  • Immunology
  • Cell Biology
  • Virology

Background:

  • Natural killer (NK) cells are crucial for innate immunity.
  • A distinct memory-like NK cell subset has been identified.
  • The role of NK cell memory in disease, including COVID-19, is under investigation.

Purpose of the Study:

  • To define the molecular identity of the memory-like NK cell subset.
  • To investigate the origin, longevity, and function of this NK cell subset.
  • To explore the association between this NK cell subset and COVID-19 disease severity.

Main Methods:

  • Single-cell transcriptome analysis was employed.
  • The study focused on characterizing a specific NK cell subset.
  • Data analysis aimed to identify molecular markers and cellular pathways.

Main Results:

  • A unique memory-like NK cell subset was identified.
  • This subset accumulates with aging.
  • An association was observed between this NK cell subset and increased COVID-19 severity.

Conclusions:

  • The molecular characterization of this memory-like NK cell subset is essential.
  • Further research is needed to understand their origin, longevity, and function.
  • This subset may play a significant role in the immune response to infections like COVID-19.