Anti-Trichomonas vaginalis activity of ursolic acid derivative: a promising alternative
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Trichomonas vaginalis is an extracellular parasite that binds to the epithelium of the human urogenital tract and causes the sexually transmitted infection, trichomoniasis. In view of increased resistance to drugs belonging to the 5-nitroimidazole class, new treatment alternatives are urgently needed. In this study, eight semisynthetized triterpene derivatives were evaluated for in vitro anti-T. vaginalis activity. Ursolic acid and its derivative, 3-oxime-urs-12-en-28-oic-ursolic acid (9), presented the best anti-T. vaginalis activity when compared to other derivatives, with minimum inhibitory concentration (MIC) at 25 μM. Moreover, 9 was active against several T. vaginalis fresh clinical isolates. Hemolysis assay demonstrated that 9 presented a low hemolytic effect. Importantly, 25 μM 9 was not cytotoxic against the Vero cell lineage. Finally, we demonstrated that compound 9 acts synergistically with metronidazole against a T. vaginalis metronidazole-resistant isolate. This report reveals the high potential of the triterpenoid derivative 9 as trichomonicidal agent.
KeywordsTriterpenes Trichomonas vaginalis Ursolic acid Betulinic acid Synthetic derivatives
The authors thank LRNANO/CNANO for the NMR analysis.
Compliance with ethical standards
The Universidade Federal do Rio Grande do Sul Research Ethical Committee approved documents, procedures, and project under authorization CAAE 47423415.5.0000.5347 and 18923. The informed consent for each participant was approved by the Institutional Review Board.
Conflict of interest
The authors declare that they have no conflict of interest.
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