Larvicidal activity of coumarin derivatives on Toxocara canis larvae, cytotoxicity analysis, and in silico bioavailability studies (original) (raw)

Abstract

Human toxocariasis is a neglected anthropozoonosis with global distribution. Treatment is based on the administration of anthelmintics; however, their effectiveness at the tissue level is low to moderate, necessitating the discovery of new drug candidates. Several groups of synthetic compounds, including coumarin derivatives, have demonstrated bioactivity against fungi, bacteria, and even parasites, such as Dactylogyrus intermedius, Leishmania major, and Plasmodium falciparum. The aim of this study was to evaluate the effect of ten coumarin-derived compounds against Toxocara canis larvae using in vitro, cytotoxicity, and in silico tests for selecting new drug candidates for preclinical tests aimed at evaluating the treatment of visceral toxocariasis. The compounds were tested in vitro in duplicate at a concentration of 1 mg/mL, and compounds with larvicidal activity were serially diluted to obtain concentrations of 0.5 mg/mL; 0.25 mg/mL; 0.125 mg/mL; and 0.05 mg/mL. The tests were performed in a microculture plate containing 100 T_. canis_ larvae in RPMI-1640 medium. One compound (COU 9) was selected for cytotoxicity analysis using J774.A1 murine macrophages and it was found to be non-cytotoxic at any concentration tested. The in silico analysis was performed using computational models; the compound presented adequate results of oral bioavailability. To confirm the non-viability of the larvae, the contents of the microplate wells of COU 9 were inoculated intraperitoneally (IP) into female Swiss mice at 7–8 weeks of age. This confirmed the larvicidal activity of this compound. These results show that COU 9 exhibited larvicidal activity against T. canis larvae, which, after exposure to the compound, were non-viable, and that COU 9 inhibited infection in a murine model. In addition, COU 9 did not exhibit cytotoxicity and presented adequate bioavailability in silico, similar to albendazole, an anthelmintic, which is the first choice for treatment of human toxocariasis, supporting the potential for future investigations and preclinical tests on COU 9.

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No datasets were generated or analysed during the current study.

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Funding

D. F. Ramos is productivity research fellows from National Council for Scientific and Technological Development (CNPq) (process number PQ 306806/2022–3). The authors acknowledge the financial support from the Brazilian Agency Coordenação de Aperfeiçoamento de Pessoal de Nível Superior and the scholarship granted.

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Authors and Affiliations

  1. Parasitology Laboratory, Faculty of Medicine, Federal University of Rio Grande, Rio Grande, Brazil
    Débora Carvalho Rodrigues, Carolina Netto de Oliveira da Cunha, Gabriela Torres Mattos, Lourdes Helena Rodrigues Martins, Luciana Farias da Costa de Avila & Carlos James Scaini
  2. Synthesi Department, Institute of Drug Technology, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
    Thais Cristina Mendonça Nogueira & Marcus Vinícius Nora de Souza
  3. New Drug Development Laboratory, Faculty of Medicine, Federal University of Rio Grande, Rio Grande, Brazil
    Daniela Fernandes Ramos

Authors

  1. Débora Carvalho Rodrigues
  2. Carolina Netto de Oliveira da Cunha
  3. Gabriela Torres Mattos
  4. Lourdes Helena Rodrigues Martins
  5. Thais Cristina Mendonça Nogueira
  6. Marcus Vinícius Nora de Souza
  7. Luciana Farias da Costa de Avila
  8. Daniela Fernandes Ramos
  9. Carlos James Scaini

Contributions

Débora Carvalho Rodrigues - Writing – review & editing, Methodology, Formal analysis, Conceptualization. Carolina Netto de Oliveira da Cunha - Methodology. Gabriela Torres Mattos - Methodology. Lourdes Helena Rodrigues Martins - Methodology. Thais Cristina Mendonça Nogueira - Methodology. Marcus Vinícius Nora de Souza - Methodology. Luciana Farias da Costa de Avila - Formal analysis, Conceptualization. Daniela Fernandes Ramos - Project supervisor, Writing – review & editing, Methodology, Formal analysis, Conceptualization. Carlos James Scaini - Project administration, Writing – review & editing, Formal analysis, Conceptualization.

Corresponding author

Correspondence toDébora Carvalho Rodrigues.

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Declarations

According to Brazilian law no 11.794/2008 (Arouca law), article 2◦ applies to animals of species classified as phylum Chordata, subphylum Vertebrata, subject to environmental legislation. The Federal University of Rio Grande is accredited by the Commission for Ethics in the Use of Animals (CEUA) in accordance with the provisions of article 8◦ of the Arouca law. This study was approved by the Ethics Committee in Research of the Federal University of Rio Grande (P034/2020).

Not applicable.

Competing interests

The authors declare no competing interests.

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Handling Editor: Una Ryan

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Rodrigues, D.C., de Oliveira da Cunha, C.N., Mattos, G.T. et al. Larvicidal activity of coumarin derivatives on Toxocara canis larvae, cytotoxicity analysis, and in silico bioavailability studies.Parasitol Res 123, 246 (2024). https://doi.org/10.1007/s00436-024-08272-4

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