Abstract
Herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2) infect, respectively, 67% and 13% of the world population, most commonly causing mild symptoms, such as blisters/ulcers. However, severe conditions such as keratitis, encephalitis, and systemic infections may occur, generally associated with the patient’s immunological condition. Although Acyclovir® (ACV) and its analogs are the reference drugs for herpetic infections, the number of ACV-resistant HSV infections is growing exponentially. Therefore, new natural products’ bioactive compounds have been studied to develop novel effective anti-herpetics. Trichilia catigua is a plant widely used in traditional medicine, including the treatment of skin diseases and sexual infections. In our study, 16 extracts from the bark of T. catigua, obtained with different solvents and their combinations, were evaluated against HSV-1 AR and HSV-2, respectively, ACV resistance and genital strains in vitro. The extracts with the highest selectivity index were used to prepare new topical anti-herpetic formulations and confirmed in vivo. Two new topical formulations were suggested to treat cutaneous and genital herpetic recurrent lesions. The cytotoxicity and antiviral activity were tested using the MTT method. The cytotoxic (CC50) and inhibitory (IC50) concentrations of 50% and the selectivity index (SI: CC50/IC50) were determined. Tc12, Tc13, and Tc16 were added to the formulations. Infected BALB/c mice were treated for 8 days, and the severity of the herpetic lesions was analyzed daily. All CEs showed a CC50 value ranging from 143 to 400 µg/mL, except for Tc3 and Tc10. Tc12, Tc13, and Tc16 showed the best SI in the 0 h, virucidal, and adsorption inhibition assays. In the in vivo test against HSV-1 AR, the infected animals treated with creams were statistically different from the infected non-treated animals and similar to ACV-treated mice. In HSV-2-infected genitalia, similar effects were found for Tc13 and Tc16 gels. The present study demonstrated that extracts from the bark of T. catigua, traditionally used in folk medicine, are a valuable source of active compounds with anti-herpetic activity. The extracts showed a virucidal mechanism of action and prevented the initial stages of viral replication. The cutaneous and genital infections were strongly inhibited by the Tc12, Tc13, and Tc16 extracts. New topical therapeutic alternatives using Trichilia catigua extracts are suggested for patients infected with ACV-resistant strains of HSV.
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Acknowledgements
Author Elisa Vicente Ribelato is grateful for the post-graduation scholarship granted by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Coordination for the Improvement of Higher Education Personnel, CAPES), protocol no. 88882.448103/2019-01.
Funding
Author Elisa Vicente Ribelato has received a post-graduate scholarship from Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Coordination for the Improvement of Higher Education Personnel CAPES), protocol number 88882.448103/2019–01.
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All authors contributed to the study’s conception and design. JCPdeM and AASGL provided the plant materials. EVR, GGC, TJB, and MGLB performed the extracts’ antiviral screening tests. EVR, JW, BCDR, and MLGD performed in vivo assay. FGdeA and MCdeO performed histological analysis. SPDdaR and LCF-G conceived and supervised the study. EVR, JW, and LCF-G drafted the manuscript. All authors read and approved the final manuscript.
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All procedures performed in this study involving animals were in accordance with ARRIVE (Animal Research: Reporting of In Vivo Experiments) and following the National Council for the Control of Animal Experimentation (CONCEA) guidelines. The study was approved by the Bioethics Committee of the Universidade Estadual de Londrina (UEL), no. 16933.2018.50.
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Ribelato, E.V., Wouk, J., Celestino, G.G. et al. Topical formulations containing Trichilia catigua extract as therapeutic options for a genital and an acyclovir-resistant strain of herpes recurrent infection. Braz J Microbiol 54, 1501–1511 (2023). https://doi.org/10.1007/s42770-023-01027-w
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DOI: https://doi.org/10.1007/s42770-023-01027-w