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Cells of the Innate Immune Response01:28

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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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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 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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Updated: Jul 29, 2025

Bone Marrow-derived Macrophage Production
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Innate Immune Memory in Macrophages.

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  • 1Founding Chairman, Global Newborn Society, Clarksville, Maryland, United States of America.

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|May 19, 2023
PubMed
Summary
This summary is machine-generated.

Innate immune memory (IIM) in macrophages strengthens with exposure, offering potential protection early in life and in various disorders. This cellular memory involves epigenetic and metabolic changes, suggesting therapeutic possibilities.

Keywords:
ChromatinDevelopmentFetusFumarateLipoprotein(a)MMP-2MMP-9NeonateNewbornSuccinic acidα-ketoglutaric acid

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Area of Science:

  • Immunology
  • Cellular Biology

Background:

  • Macrophages are key innate immunity mediators from fetal development.
  • Innate immune memory (IIM), or trained immunity, enhances macrophage responses after repeated triggers.
  • This memory is linked to epigenetic and metabolic reprogramming.

Purpose of the Study:

  • To review the properties and mechanisms of macrophage-mediated IIM.
  • To explore the potential clinical significance of IIM, particularly in neonates.
  • To discuss therapeutic enhancements for IIM.

Main Methods:

  • Review of existing literature on trained immunity and macrophage function.
  • Analysis of epigenetic and metabolic reprogramming in innate immune memory.
  • Exploration of clinical applications and therapeutic strategies.

Main Results:

  • Macrophage responses strengthen with immunological memory, independent of adaptive immunity.
  • IIM is crucial for early-life immunity before adaptive immunity develops.
  • IIM holds potential for preventing and treating various disorders.

Conclusions:

  • Macrophage-mediated IIM is a significant immunological concept with broad implications.
  • Understanding IIM mechanisms can lead to novel preventive and therapeutic strategies.
  • Targeted vaccination may enhance IIM for clinical benefit.