Mugwort and Barberry Show Promise Against Two Common Parasitic Infections

Jim Crocker
20th February, 2026

Mugwort and Barberry Show Promise Against Two Common Parasitic Infections

The morphological characteristics of the medicinal plants Berberis vulgaris (a, b) and Artemisia vulgaris (c, d) confirm the identity of the source material for the antiprotozoal extracts tested in this study.

Image adapted from: Aksoy et al. / CC BY (Source)

Key Findings

  • Extracts from Artemisia vulgaris and Berberis vulgaris, studied in Türkiye, showed activity against Leishmania major and Trichomonas vaginalis parasites
  • Berberis vulgaris extract was more potent than Artemisia vulgaris, effectively reducing parasite numbers with relatively low toxicity to human cells
  • Both plant extracts selectively killed parasites without significantly harming human immune cells, suggesting potential as drug candidates
Leishmania major and Trichomonas vaginalis are parasitic diseases affecting millions worldwide, particularly in tropical and subtropical regions. Current treatments often have drawbacks, including significant side effects, the development of drug resistance in parasites, and limited access in resource-poor settings. This has driven research into alternative therapies, particularly those derived from natural sources. A recent study conducted by researchers at Inonu University and Manisa Celal Bayar University[1] investigated the potential of extracts from Artemisia vulgaris (mugwort) and Berberis vulgaris (barberry) as antiprotozoal agents. The study focused on evaluating the effectiveness of ethanol extracts from these two plants against both Leishmania major and Trichomonas vaginalis. The researchers employed a range of laboratory techniques to assess parasite viability, including CellTiter-Glo® – a method measuring cellular metabolic activity as an indicator of live cells – microscopic observation, and a ‘rescue-transformation’ assay to confirm the parasiticidal effect. Importantly, they also measured the toxicity of the extracts to human cells (specifically, THP-1 macrophages, a type of immune cell) to determine their selectivity – meaning their ability to kill parasites without harming the host. Amphotericin B and metronidazole were used as standard comparison drugs. The results indicated that both A. vulgaris and B. vulgaris extracts demonstrated antiprotozoal activity with relatively low toxicity to human cells. Berberis vulgaris extract proved to be more potent than Artemisia vulgaris, exhibiting a lower IC₅₀ value (76.8 µg/mL) against Leishmania major, meaning a lower concentration was needed to inhibit parasite growth. This translated to a selectivity index (SI) of 4.7 for amastigotes, the form of the parasite found inside host cells, indicating a reasonable margin of safety. Artemisia vulgaris had an IC₅₀ of 179.7 µg/mL and an SI of 2.6. Both extracts were able to reduce the number of parasites inside cells in a dose-dependent manner, and complete parasite clearance was achieved at concentrations that weren’t harmful to the human cells tested. Against Trichomonas vaginalis, both extracts also showed concentration-dependent inhibition, with Berberis vulgaris again performing better (IC₅₀ of 68.9 µg/mL, SI of 5.2) compared to Artemisia vulgaris (IC₅₀ of 104.4 µg/mL, SI of 4.5). These findings suggest that both plant extracts possess selective antiprotozoal activity, making them potentially valuable candidates for drug development. These results are particularly interesting when considered alongside earlier research on related compounds. For instance, studies have identified 2-acylamino-5-nitro-1,3-thiazole derivatives as promising leads against neglected protozoan parasites, including Giardia intestinalis and Trichomonas vaginalis[2]. These compounds, like the extracts studied here, exhibited nanomolar inhibition, meaning they were effective at very low concentrations. While the mechanisms of action are different, the focus on identifying compounds with high potency and low toxicity is a common thread. The research into thiazole derivatives also highlighted the importance of ligand efficiency – a measure of how well a compound binds to its target – and in silico toxicity profiling, both of which could be applied to further investigate the potential of A. vulgaris and B. vulgaris extracts. Furthermore, the challenges in treating trichomoniasis, particularly the emergence of metronidazole resistance, underscore the need for new therapeutic options[3]. The study’s finding that both extracts inhibited T. vaginalis growth, and the relatively high selectivity indices achieved, suggests they could offer an alternative approach. The success of hybrid compounds combining benzimidazole and pentamidine against several protozoa, including T. vaginalis and Leishmania mexicana, demonstrates the potential for combining different chemical structures to enhance activity[4]. The extracts from A. vulgaris and B. vulgaris could potentially serve as a source of novel compounds for such hybrid designs. The study acknowledges the need for further research to identify the specific active compounds within the extracts responsible for the antiprotozoal effects. Understanding the mechanisms of action is also crucial, as is evaluating their efficacy in animal models (in vivo studies) to determine their potential for use as therapeutic agents. However, the initial findings are encouraging, highlighting the potential of Artemisia vulgaris and Berberis vulgaris as natural sources of antiprotozoal drugs.

HerbsMedicineBiochem

References

Main Study

1) Antiprotozoal Activity of Artemisia vulgaris and Berberis vulgaris Against Leishmania major and Trichomonas vaginalis

Published 16th February, 2026

https://doi.org/10.1007/s11686-026-01224-1

Related Studies

2) 2-acylamino-5-nitro-1,3-thiazoles: preparation and in vitro bioevaluation against four neglected protozoan parasites.

https://doi.org/10.1016/j.bmc.2014.01.029

3) In Vitro Testing of Trichomonas vaginalis Drug Susceptibility: Evaluation of Minimal Lethal Concentrations for Metronidazole and Tinidazole That Correspond With Treatment Failure.

https://doi.org/10.1097/OLQ.0000000000001788

4) Design, synthesis and in vitro antiprotozoal activity of benzimidazole-pentamidine hybrids.

https://doi.org/10.1016/j.bmcl.2008.05.009


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