Linalool as a potential agent against Toxoplasma gondii: an in vitro study

Area of Science:

• Parasitology
• Pharmacology
• Natural Products Chemistry

Background:

• Toxoplasmosis, a widespread zoonotic disease caused by *Toxoplasma gondii*, necessitates new treatments due to limitations of current therapies.
• Existing treatments for toxoplasmosis exhibit limited efficacy and potential side effects, highlighting the need for novel therapeutic strategies.

Purpose of the Study:

• To investigate the in vitro antiparasitic effects of linalool against *Toxoplasma gondii* tachyzoites.
• To determine the dose-dependent activity of linalool and compare its efficacy to a positive control (saponin).

Main Methods:

• *Toxoplasma gondii* RH strain tachyzoites were exposed to various concentrations of linalool.
• Flow cytometry was employed to analyze parasite mortality rates.
• Results were compared against a saponin positive control and a no-treatment negative control.

Main Results:

• Linalool exhibited dose-dependent *in vitro* activity against *Toxoplasma gondii* tachyzoites.
• Mortality rates increased with linalool concentration, reaching 74.44% at 1200 µg/mL, surpassing the positive control (67.87%).
• These findings indicate linalool's extracellular antiparasitic potential against *T. gondii*.

Conclusions:

• Linalool shows promising *in vitro* efficacy against *Toxoplasma gondii* tachyzoites.
• The study provides a foundation for further research into linalool's intracellular and *in vivo* activity and safety for treating toxoplasmosis.