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Related Concept Videos

Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

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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.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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Related Experiment Video

Updated: Dec 24, 2025

Myeloid Cell Isolation from Mouse Skin and Draining Lymph Node Following Intradermal Immunization with Live Attenuated Plasmodium Sporozoites
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CD19+CD1dhiCD5hi B Cells Can Downregulate Malaria ITV Protection by IL-10 Secretion.

Hongli Guan1, Jiacong Peng1, Liping Jiang1

  • 1Department of Parasitology, Guilin Medical University, Guilin, China.

Frontiers in Public Health
|April 8, 2020
PubMed
Summary

Lower doses of infection treatment vaccine (ITV) may enhance long-lasting malaria protection. Specific B cells (B10) and IL-10 levels appear to negatively regulate vaccine efficacy.

Keywords:
B10 cellsIL-10Plasmodiuminfection treatment vaccine (ITV)malaria vaccinememory B cells

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Area of Science:

  • Immunology
  • Vaccinology
  • Parasitology

Background:

  • Infection treatment vaccine (ITV) offers protection against malaria but often shows parasite breakthrough.
  • The rapid decline in vaccine-induced protection after immunization is not well understood.

Purpose of the Study:

  • To investigate the mechanism behind the decline in malaria vaccine protection.
  • To evaluate the impact of different ITV doses on protection duration and B cell phenotypes.

Main Methods:

  • Mice were immunized with varying doses of ITV and challenged with malaria parasites at different time points.
  • Protection levels were assessed using blood smears.
  • B cell phenotypes and serum cytokine levels (including IL-10) were analyzed via flow cytometry and cytometric bead array.

Main Results:

  • Lower ITV doses (10^3) provided longer protection compared to higher doses (10^5, 10^7).
  • Protection waned over time, correlating with decreased memory B cells (MBCs).
  • Regulatory B10 cells (CD19+CD1dhiCD5hi) and elevated IL-10 levels were associated with reduced vaccine protection.

Conclusions:

  • Higher malaria vaccine doses do not necessarily ensure better or longer-lasting protection.
  • Regulatory B10 cells secreting IL-10 may suppress vaccine-induced immunity against malaria.
  • Findings suggest strategies to design more effective, long-lasting malaria vaccines by managing MBC function and regulatory B cells.