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Related Concept Videos

Immunological Memory01:23

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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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Vaccines are among the most effective tools in preventive medicine, designed to prepare the immune system to recognize and combat infectious agents. By introducing antigens—substances that the immune system identifies as foreign—vaccines stimulate an adaptive immune response that leads to immunological memory. This immunological memory enables the body to mount a faster and more effective response upon future exposures to the actual pathogen.Vaccines can be categorized based on the...
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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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Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
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Memory T cells maintain protracted protection against malaria.

Urszula Krzych1, Stasya Zarling1, Alexander Pichugin1

  • 1Department of Cellular Immunology, Branch of Malaria Vaccine Development, Walter Reed Army Institute of Research, Silver Spring, MD 20910, United States.

Immunology Letters
|April 9, 2014
PubMed
Summary

Immunologic memory is crucial for vaccines. Memory CD8 T cells are vital for long-lasting protection against malaria, especially when boosted by antigen depots.

Keywords:
CD8T cellsLiverMalariaMemory T cellsMouse modelPlasmodium

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Vaccinology

Background:

  • Immunologic memory, characterized by persistent memory cells, is key for effective immune responses and prophylactic immunization.
  • Understanding immunologic memory induced by parasites like Plasmodium (malaria) is crucial, as natural exposure in endemic areas often leads to inadequate memory.
  • While CD4 T cells are linked to protection in humans, CD8 T cells are critical in murine models for protection induced by attenuated Plasmodium sporozoites (γ-spz).

Purpose of the Study:

  • To review the role of immunologic memory in malaria infection and experimental models.
  • To highlight the importance of CD8 T cells in maintaining long-lasting protection against malaria.
  • To discuss mechanisms of memory recall and collaboration with other immune cells.

Main Methods:

  • Review of existing literature on immunologic memory, malaria, and experimental models.
  • Analysis of studies involving radiation-attenuated Plasmodium sporozoites (γ-spz) in humans and murine models.
  • Discussion of observations on CD8 T cell responses to Plasmodium berghei liver stage antigens.

Main Results:

  • Multiple exposures to γ-spz induce sterile, long-lasting protection against experimental malaria.
  • Memory CD8 T cells specific for Plasmodium berghei liver stage antigens are essential for maintaining this protection.
  • An antigen depot facilitates rapid recall of memory T cells, promoting robust CD8 and CD4 T cell responses and antibody production.

Conclusions:

  • Memory CD8 T cells are indispensable for sustained protective immunity against experimental malaria.
  • Antigen depots enhance memory T cell recall, leading to effective collaboration between T and B cells for antibody-mediated immunity.
  • Further research into parasitic immunologic memory, particularly CD8 T cell roles, is warranted for improved malaria control strategies.