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Related Concept Videos

Malaria01:29

Malaria

Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...
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Cell-mediated Immune Responses

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Cytotoxic T Cells-mediated Immune Response

Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
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Cells of the Adaptive Immune Response

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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Immunological Memory

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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Myeloid Cell Isolation from Mouse Skin and Draining Lymph Node Following Intradermal Immunization with Live Attenuated Plasmodium Sporozoites
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CD8+ T effector memory cells protect against liver-stage malaria.

Arturo Reyes-Sandoval1, David H Wyllie, Karolis Bauza

  • 1The Jenner Institute, University of Oxford, Oxford OX3 7DQ, United Kingdom. arturo.reyes@ndm.ox.ac.uk

Journal of Immunology (Baltimore, Md. : 1950)
|July 1, 2011
PubMed
Summary

Identifying correlates of protection is crucial for malaria vaccine development. Persistent CD8(+) T(EM) cells are essential for pre-erythrocytic malaria protection, guiding future vaccine design.

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Area of Science:

  • Immunology
  • Vaccinology
  • Infectious Diseases

Background:

  • Correlates of protection are vital for effective vaccine development, particularly for challenging diseases like malaria.
  • Pre-erythrocytic malaria targets liver-stage infection, a critical window for intervention.

Purpose of the Study:

  • To investigate the role of different CD8(+) T cell subsets in vaccine-induced protection against liver-stage malaria.
  • To compare the efficacy of adenoviral (Ad) and modified vaccinia Ankara (MVA) vectors in generating protective immune responses.

Main Methods:

  • Classifying CD8(+) T cells into effector, effector memory (T(EM)), and central memory subsets using CD62L and CD127 markers.
  • Utilizing Ad and MVA vectors expressing malaria antigens for vaccination in mice.
  • Assessing protection against malaria sporozoite challenge and correlating immune cell populations with protection.

Main Results:

  • MVA induced rapid central memory T cells but failed to protect against malaria.
  • Ad vectors induced prolonged effector T cell and T(EM) responses, crucial for protection.
  • Persistent CD8(+) T(EM) cells in blood correlated strongly with protection against liver-stage malaria infection.

Conclusions:

  • Persistent CD8(+) T(EM) cell populations are essential for vaccine-induced pre-erythrocytic protection against malaria.
  • These findings have significant implications for designing more effective malaria vaccines targeting the liver stage.