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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
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Interactions between Innate Immune Memory and the Central Nervous System.

Rafaela Rodrigues Valerio1, Andressa Bernardi2, Adriana Bonomo1

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Summary

Innate immune cells, traditionally not thought to have memory, can develop long-term functional changes. This review explores trained immunity and innate tolerance, with implications for neurodegenerative disorders.

Keywords:
Central nervous systemInnate immunityMicrogliaToleranceTrained immunity

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Area of Science:

  • Immunology
  • Neuroscience

Background:

  • Immunological memory was historically attributed solely to adaptive immune cells.
  • Emerging evidence demonstrates innate immune cells can acquire adaptive characteristics, exhibiting long-term functional changes.
  • This phenomenon, termed trained immunity or immune tolerance, involves enhanced or suppressed responses upon secondary challenge.

Purpose of the Study:

  • To review features and molecular mechanisms of trained immunity and innate tolerance in innate immune cells.
  • To discuss the role of innate immune memory in microglia.
  • To explore therapeutic strategies for modulating innate immunity in neurodegenerative diseases.

Main Methods:

  • Review of existing literature on innate immune memory.
  • Analysis of molecular mechanisms underlying trained immunity and tolerance.
  • Discussion of microglia's role and therapeutic implications.

Main Results:

  • Innate immune cells can exhibit memory-like properties, influencing inflammatory responses.
  • Dysregulation of trained immunity is linked to chronic inflammation and autoimmune diseases.
  • Innate immune memory in microglia may contribute to neuropathology.

Conclusions:

  • Trained immunity and innate tolerance represent adaptive characteristics of innate immune cells.
  • Microglia's innate immune memory has significant implications for neurodegenerative disorders.
  • Targeting innate immunity offers potential therapeutic avenues for neurological conditions.