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Related Concept Videos

Cells of the Innate Immune Response01:28

Cells of the Innate Immune Response

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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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Aging01:26

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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Immune Surveillance by NK Cells and Phagocytes01:25

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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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Neurogenesis and Regeneration of Nervous Tissue01:15

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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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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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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: Nov 22, 2025

Isolation and Characterization of the Immune Cells from Micro-dissected Mouse Choroid Plexuses
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Killing the buzz: NK cells in the aged brain.

Rachael A Clark1

  • 1Department of Dermatology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.

Science Immunology
|January 9, 2021
PubMed
Summary

In the aged brain, senescent neuroblasts trigger natural killer (NK) cells in the dentate gyrus. This immune response causes neuronal damage, ultimately impairing cognitive function.

Area of Science:

  • Neuroscience
  • Immunology
  • Aging Research

Background:

  • The aging brain exhibits cellular senescence, a state of irreversible growth arrest.
  • Neurogenesis, the process of generating new neurons, declines with age, particularly in the dentate gyrus.
  • Natural killer (NK) cells are immune cells with roles in surveillance and tissue remodeling.

Discussion:

  • Senescent neuroblasts in the aged dentate gyrus were found to actively recruit and activate NK cells.
  • This activation leads to targeted destruction of surrounding neurons, contributing to age-related cognitive decline.
  • The study highlights a novel mechanism linking cellular senescence to neuroinflammation and neuronal loss.

Key Insights:

  • Senescent neuroblasts act as a trigger for detrimental immune responses in the aging brain.

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  • NK cell activation by senescent cells in the dentate gyrus directly contributes to cognitive impairment.
  • This identifies a specific cellular interaction driving age-associated neurodegeneration.

    • Outlook:

    • Targeting senescent neuroblasts or their interaction with NK cells could offer therapeutic strategies for cognitive aging.
    • Further research into the precise molecular signals mediating this interaction is warranted.
    • Understanding this pathway may reveal new avenues for treating age-related cognitive disorders.