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Related Concept Videos

Immunological Memory01:23

Immunological Memory

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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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Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature...
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Cells of the Adaptive Immune Response01:23

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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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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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Diversity of Antigen Receptors01:28

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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
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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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Immunological memory diversity in the human upper airway.

Sydney I Ramirez1,2, Farhoud Faraji1,3, L Benjamin Hills1,4

  • 1Center for Vaccine Innovation, La Jolla Institute for Immunology, La Jolla, CA, USA.

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Immune memory in the upper airway, including distinct memory B cells and T cells, was characterized using nasal swabs. This study reveals insights into local immune responses, particularly in breakthrough SARS-CoV-2 infections.

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Area of Science:

  • Immunology
  • Upper Airway Biology
  • Mucosal Immunity

Background:

  • The human upper airway is a critical site for infection, yet immune memory here remains poorly understood.
  • This knowledge gap has significant implications for diseases like COVID-19 and other infections.

Purpose of the Study:

  • To investigate immune cell populations and memory in the human upper airway.
  • To determine if nasal and nasopharyngeal swabs can provide insights into upper airway immunity.
  • To characterize local immune responses during SARS-CoV-2 breakthrough infections.

Main Methods:

  • Analysis of immune cell populations from nasal and nasopharyngeal swabs collected monthly over one year from healthy adults.
  • Identification of antigen-specific memory B cells and T cells.
  • Characterization of immune cells in individuals with SARS-CoV-2 breakthrough infections.

Main Results:

  • Distinct populations of antigen-specific memory B cells and T cells, including tissue-resident memory cells (T RM and B RM), were identified in the upper airway.
  • Germinal center cells were unexpectedly found in nasopharyngeal swabs.
  • In SARS-CoV-2 breakthrough infections, local virus-specific B RM cells, plasma cells, and germinal center B cells were detected, indicating local immune priming.

Conclusions:

  • Nasal and nasopharyngeal swabs are effective tools for studying upper airway immune memory.
  • The upper airway harbors stable, resident memory immune cell populations and exhibits local responses to viral infections.
  • Findings advance understanding of immune memory at a key human mucosal barrier.