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Introduction to Innate and Adaptive Immunity01:21

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The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
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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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Bidirectional Communication Between the Innate and Adaptive Immune Systems.

Kathrynne A Warrick1, Charles N Vallez1, Hannah E Meibers1

  • 1Division of Immunobiology and Center for Inflammation and Tolerance, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, Ohio, USA ;

Annual Review of Immunology
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Summary

Effective communication between innate and adaptive immunity is vital for health. Memory T cells can activate innate immunity, which is protective but can also cause autoimmune diseases.

Keywords:
CAR-T cellsT cell memoryTNF superfamilyautoimmunitycytokine stormsmicrobial defensesterile inflammation

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Area of Science:

  • Immunology
  • Cellular Biology
  • Pathology

Background:

  • The innate immune system provides the initial defense against pathogens and tissue damage.
  • Adaptive immune cells, particularly memory T cells, are crucial for long-term immunity and recall responses.
  • Bidirectional communication between these systems is essential for maintaining tissue homeostasis.

Purpose of the Study:

  • To review the regulatory mechanisms governing the interaction between innate and adaptive immunity.
  • To highlight the role of memory T cells in instructing innate immune cells.
  • To discuss the implications of adaptive immune system activation of innate immunity in health and disease.

Main Methods:

  • This review synthesizes existing research on immune cell interactions.
  • It examines the signaling pathways involved in T cell-mediated innate immune activation.
  • The review discusses evidence from studies on infections, autoimmunity, and other pathologies.

Main Results:

  • Memory T cells can directly activate myeloid cells to induce innate inflammation, independent of microbial signals.
  • This adaptive instruction of innate immunity is a double-edged sword, crucial for combating reinfections but implicated in autoimmune diseases.
  • Complex regulatory networks govern this interaction, ensuring appropriate immune responses.

Conclusions:

  • Adaptive immune cells, especially memory T cells, actively shape innate immune responses.
  • Dysregulation of this adaptive instruction contributes to T cell-driven pathologies like autoimmunity.
  • Understanding these interactions is key to developing novel therapeutic strategies for immune-mediated diseases.