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Natural regulatory T cells mediate the development of cerebral malaria by modifying the pro-inflammatory response

Jing-jing Wu1, Guang Chen, Jun Liu

  • 1Department of Immunology, College of Basic Medical Sciences, China Medical University, Heping District, Shenyang, China.

Parasitology International
|March 12, 2010
PubMed

Insights

Regulatory T cells (Tregs) play a key role in cerebral malaria (CM) pathogenesis. Depleting Tregs protected mice from experimental CM by restoring immune balance, highlighting their regulatory function in severe malaria.

Area of Science:

  • Immunology
  • Infectious Diseases
  • Neuroscience

Background:

  • Cerebral malaria (CM) is a severe neurological complication of Plasmodium falciparum infection, primarily affecting children and non-immune adults.
  • The immunopathology of CM involves complex interactions between parasite factors and host immune responses, including pro- and anti-inflammatory cytokines.
  • Regulatory T cells (Tregs) are crucial immune modulators, but their specific role in CM pathogenesis remains incompletely understood.

Purpose of the Study:

  • To investigate the dynamics of regulatory T cells (Tregs) and cytokine profiles in mouse models of experimental cerebral malaria (ECM).
  • To determine the contribution of Tregs to the pathogenesis and outcome of ECM.
  • To elucidate the mechanisms by which Tregs influence the balance of pro- and anti-inflammatory responses in ECM.

Main Methods:

  • Analysis of regulatory T cell (CD4(+)CD25(+)Foxp3(+)) populations and cytokine levels (IFN-gamma, TNF-alpha, IL-6, IL-17, IL-10, NO) in C57BL/6 (susceptible), BALB/c, and DBA/2 (resistant) mice infected with Plasmodium berghei ANKA (P.bANKA).
  • In vivo depletion of Tregs in susceptible C57BL/6 mice using specific antibodies.
  • Assessment of ECM incidence, severity, and cytokine profiles following Treg depletion.

Main Results:

  • C57BL/6 mice developed ECM, while BALB/c and DBA/2 mice exhibited resistance, succumbing to hyperparasitemia and severe anemia.
  • Resistant mice had significantly higher proportions and numbers of Tregs compared to susceptible mice.
  • CM-susceptible mice showed elevated pro-inflammatory cytokines (IFN-gamma, TNF-alpha, IL-6, IL-17, NO) and lower anti-inflammatory IL-10.
  • In vivo Treg depletion protected C57BL/6 mice from ECM and reversed pro- and anti-inflammatory cytokine production.
  • Tregs modulate the balance of immune responses, contributing to ECM pathogenesis by influencing pro-inflammatory cytokine production.

Conclusions:

  • An appropriate balance between pro- and anti-inflammatory immune responses is critical for controlling severe malaria pathogenesis.
  • Regulatory T cells (Tregs) are key regulators of this immune balance and play a significant role in mediating the incidence and outcome of experimental cerebral malaria.
  • Targeting Tregs may offer a therapeutic strategy for managing severe malaria complications.

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