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A Genetic Screen to Isolate Toxoplasma gondii Host-cell Egress Mutants
14:56

A Genetic Screen to Isolate Toxoplasma gondii Host-cell Egress Mutants

Published on: February 8, 2012

Review: Toxoplasma gondii cellular invasion

A Bonhomme1, L Pingret, J M Pinon

  • 1Unité INSERM U. 314, Reims, France.

Parassitologia
|December 1, 1992
PubMed

Insights

Toxoplasma gondii invades host cells through a multi-step process involving specific molecular interactions and energy-dependent mechanisms. This parasite also modulates host immune responses by stimulating T cells and releasing key lymphokines like interferon-gamma and interleukin-2.

Area of Science:

  • Parasitology
  • Cell Biology
  • Immunology

Background:

  • Toxoplasma gondii is a widespread protozoan parasite responsible for toxoplasmosis.
  • It necessitates an intracellular environment for its lifecycle, including growth and replication.

Purpose of the Study:

  • To elucidate the detailed steps and molecular requirements of Toxoplasma gondii invasion into host cells.
  • To understand the parasite's interaction with host immune cells, specifically T cell subsets.

Main Methods:

  • The study describes the six-step invasion process of T. gondii.
  • It highlights the roles of cellular recognition, parasite motility via cytoskeleton, cell adhesion, rhoptry secretion (including PEF, Ca++, and Ca++-activated ATPase), conoid penetration, and parasitophorous vacuole formation.
  • Immune stimulation and lymphokine release (IFN-gamma, IL2) were also investigated.

Main Results:

  • The invasion process is active, directed, and specific, influenced by factors such as energy sources, cations, and membrane properties.
  • T. gondii actively induces the formation of a parasitophorous vacuole, essential for its survival and exchange within the host cell.
  • The parasite effectively stimulates T cell subsets, leading to the release of crucial lymphokines.

Conclusions:

  • Toxoplasma gondii employs a complex, regulated mechanism for host cell invasion.
  • The parasite's interaction with the host immune system involves T cell activation and lymphokine production, contributing to the pathogenesis of toxoplasmosis.

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