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Signaling during the invasion of host cells by Toxoplasma gondii
A Bonhomme1, A Bouchot, N Pezzella
1UPRES-EA 2070, IFR53, 51, rue Cognacq Jay, 51095, Reims, France.
Abstract:
Invasion of host cells is essential for the pathogenicity of Toxoplasma gondii. This review examines the signal transduction pathways that lead to the internalization of T. gondii. We demonstrate that extra- and intracellular Ca(2+) mobilization, Ca(2+)-calmodulin complex and phospholipase A(2) activities are required for T. gondii entry. T. gondii also causes the activation of mitogen-activated protein kinase in infected cells and modifies its ionic environment during its intracellular state. Thus, many of the signaling systems found in other eukaryotes are operative in Toxoplasma invasion.
Insights
Toxoplasma gondii invasion relies on host cell signaling pathways. Calcium mobilization and specific enzyme activities are crucial for pathogen entry and survival within host cells.
Area of Science:
- Parasitology
- Cell Biology
- Molecular Biology
Background:
- Host cell invasion is critical for *Toxoplasma gondii* pathogenesis.
- Understanding *T. gondii* invasion mechanisms is key to developing anti-parasitic strategies.
Purpose of the Study:
- To review the signal transduction pathways involved in *Toxoplasma gondii* host cell internalization.
- To elucidate the molecular mechanisms governing *T. gondii* entry into host cells.
Main Methods:
- Review of existing literature on *Toxoplasma gondii* invasion.
- Analysis of signal transduction pathways, including calcium mobilization and enzyme activity.
- Investigation of host cell responses to *T. gondii* infection.
Main Results:
- Extra- and intracellular calcium (Ca2+) mobilization is essential for *T. gondii* entry.
- The Ca2+-calmodulin complex and phospholipase A2 activities are required for parasite internalization.
- *T. gondii* activates mitogen-activated protein kinase (MAPK) in host cells.
- The parasite modifies the host cell's ionic environment during intracellular replication.
Conclusions:
- *Toxoplasma gondii* invasion utilizes conserved eukaryotic signaling pathways.
- Calcium signaling and enzymatic activities play pivotal roles in *T. gondii* host cell invasion.
- Further research into these pathways could reveal novel therapeutic targets against toxoplasmosis.