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Penetration-enhancing factor extracted from Toxoplasma gondii which increases its virulence for mice
Abstract:
Fractionation of extracts of disintegrated Toxoplasma gondii resulted in preparations which, when tested in cell cultures, enhanced penetration of host cells by this parasite. The influence of the preparations on the virulence of the RH strain and on two naturally avirulent strains for mice was studied simultaneously with the in vitro studies. It was demonstrated that the preparations increased the virulence of Toxoplasma. Mice inoculated with the preparation plus Toxoplasma suffered earlier morbidity and had a greater mortality rate than the control animals. There was a direct correlation between the effect of the preparations on the cell-penetrating capacity of the parasites and the increase in virulence for mice, indicating that the same mechanism is operative in both the in vivo and in vitro systems observed.
Insights
Researchers found that Toxoplasma gondii extracts enhance parasite host cell entry and increase virulence in mice. This suggests a common mechanism drives both in vitro and in vivo effects, impacting host cell penetration and disease severity.
Area of Science:
- Parasitology
- Cell Biology
- Infectious Diseases
Background:
- Toxoplasma gondii is an opportunistic parasite that infects a wide range of hosts.
- Understanding the mechanisms of host cell invasion and virulence is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the effect of Toxoplasma gondii extracts on parasite host cell penetration.
- To evaluate the impact of these extracts on the virulence of T. gondii in a mouse model.
Main Methods:
- Fractionation of T. gondii extracts.
- In vitro cell culture assays to assess host cell penetration.
- In vivo studies using mice to determine virulence (morbidity and mortality rates).
Main Results:
- T. gondii extracts significantly enhanced host cell penetration by the parasite in vitro.
- Preparations increased the virulence of T. gondii strains in mice, leading to earlier morbidity and higher mortality.
- A direct correlation was observed between enhanced cell penetration and increased virulence.
Conclusions:
- The study identified components in T. gondii extracts that potentiate parasite invasion.
- These components also increase parasite virulence, suggesting a shared underlying mechanism.
- Findings highlight a potential therapeutic target for controlling toxoplasmosis.