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Related Experiment Video

Updated: Jun 26, 2025

Toxoplasma gondii Cyst Wall Formation in Activated Bone Marrow-derived Macrophages and Bradyzoite Conditions
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To kill a tachyzoite: assault and battery.

Azadeh Nasuhidehnavi1, George S Yap2

  • 1Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA.

Trends in Parasitology
|May 18, 2024
PubMed
Summary

Polymeric guanylate-binding proteins (GBPs) dismantle the vacuole membrane of Toxoplasma gondii. Nitric oxide (NO) then inhibits parasite replication, revealing a synergistic immunity mechanism.

Keywords:
GBPcell autonomous immunityiNOSnitrosylation

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Area of Science:

  • Cellular and molecular immunology
  • Parasitology
  • Host-pathogen interactions

Background:

  • Interferon-gamma (IFN-γ) activates macrophages to control intracellular pathogens.
  • Toxoplasma gondii resides within a vacuole membrane inside host cells.
  • Guanylate-binding proteins (GBPs) and nitric oxide (NO) are known immune effectors.

Purpose of the Study:

  • To elucidate the synergistic mechanism between polymeric guanylate-binding proteins (GBPs) and nitric oxide (NO) in controlling Toxoplasma gondii.
  • To investigate how these effectors cooperate within IFN-γ activated macrophages.

Main Methods:

  • Utilized cell-autonomous immunity models.
  • Investigated the physical interaction of GBPs with the parasite vacuole membrane.
  • Assessed the role of NO in inhibiting parasite replication.

Main Results:

  • Polymeric GBPs were shown to physically disrupt the vacuole membrane surrounding T. gondii.
  • Nitric oxide (NO) was confirmed to inhibit parasite replication within macrophages.
  • A novel synergistic mechanism between GBPs and NO in host defense was identified.

Conclusions:

  • GBPs and NO act synergistically to eliminate intracellular T. gondii.
  • This study reveals a new facet of cell-autonomous immunity against parasitic infections.
  • Understanding this synergy offers potential therapeutic targets for toxoplasmosis.