Eicosapentaenoic Acid Modulates Trichomonas vaginalis Activity.

Area of Science:

• Parasitology
• Biochemistry
• Drug Discovery

Background:

• Trichomonas vaginalis is a prevalent sexually transmitted parasite causing disease in both sexes.
• Metronidazole resistance in T. vaginalis necessitates the exploration of alternative therapeutic strategies.
• Understanding lipid metabolism in T. vaginalis is crucial for developing novel treatments.

Purpose of the Study:

• To investigate the anti-parasitic activity of native and oxidized forms of specific fatty acids against T. vaginalis.
• To compare the efficacy of eicosapentaenoic, docosahexaenoic, and arachidonic acids in inhibiting T. vaginalis growth.
• To analyze the chemical characteristics of oxidized fatty acids impacting parasite activity.

Main Methods:

• Treatment of T. vaginalis strains (Casu2 and ATCC 50142) with varying concentrations of native and oxidized fatty acids.
• Cell death assays to determine the toxicity of fatty acids.
• Mass spectrometric analysis to characterize oxidized fatty acid products.

Main Results:

• Native eicosapentaenoic acid demonstrated significant toxicity, causing ~90% cell death at 190-380 μM.
• Oxidized eicosapentaenoic acid exhibited low toxicity, with inhibition only observed at >3 mM concentrations.
• Low concentrations (10 μM) of oxidized eicosapentaenoic acid were associated with increased parasite density.
• Mass spectrometry revealed oxidized eicosapentaenoic acid products with increased oxygenation and varying saturation.

Conclusions:

• Eicosapentaenoic acid's efficacy against T. vaginalis is dependent on its native or oxidized form.
• Oxidized eicosapentaenoic acid may have complex effects on T. vaginalis, potentially promoting growth at low concentrations.
• Targeting lipid metabolism pathways in T. vaginalis could lead to new therapies for metronidazole-resistant infections.