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Evaluation of the anti-Trypanosoma cruzi activity in vitro and in vivo of silibinin and silibinin in association to benznidazole

Abstract

Chagas disease (CD) is endemic in Latin America. Drugs available for its treatment are benznidazole (BZ)/nifurtimox (NF), both with low efficacy in the late infection and responsible for several side effects. Studies of new drugs for CD among natural products, and using drug combinations with BZ/NF are recommended. Silibinin (SLB) is a natural compound that inhibits the efflux pump (Pgp) of drugs in host cell membranes, causes death of trypanosomatids, has anti-inflammatory activity, and was never assayed against T. cruzi. Here, in vitro and in vivo activities of SLB, SLB+BZ, and BZ against T. cruzi Y strain were evaluated. Cytotoxicity of SLB in VERO cells by the MTT method revealed IC50 of 250.22 μM. The trypanocidal activity evaluated by resazurin method in epimastigotes showed that SLB 25 μM inhibited parasite growth. SLB IC50 and selectivity index (SI) for amastigote were 79.81 μM and 3.13, respectively. SLB100+BZ10 showed higher parasite inhibition (91.44%) than SLB or BZ. Swiss mice infected with Y strain were treated with SLB, SLB+BZ, and BZ. Parasitemia was evaluated daily and 90, 180, and 240 days after treatment in surviving animals by hemoculture, blood qPCR, and after euthanasia, by qPCR in heart tissue. SLB monotherapy was not able to control the parasitemia/mortality of the animals. Parasitological negativation of 85.7–100% was observed in the experimental groups treated with SLB+BZ. Although SLB had shown activity against T. cruzi in vitro, it was not active in mice. Thus, the results of the therapeutic effect observed with SLB+BZ may be interpreted as a result from BZ action.

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Abbreviations

BZ:

Benznidazole

CD:

Chagas disease

EI:

Endocytic index

NF:

Nifurtimox

Pgp:

P-glycoprotein

SLB:

Silibinin

SI:

Selectivity index

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Acknowledgments

We thank the UFOP and CAPES undergraduate and postgraduate scholarships. Marta de Lana is a research fellow of CNPq.

Funding

This study was financially supported by the Brazilian agencies Conselho Nacional de Desenvolvimento Científico e Tecnológico-CNPq (Process 431413/2016-9) and Fundação de Amparo à Pesquisa do Estado de Minas Gerais-FAPEMIG (APQ-00766/16 and APQ-01160-15).

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Correspondence to Marta de Lana.

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All experiments were authorized by the ethics committee for animal experimentation of Federal University of Ouro Preto (CEUA-UFOP), Minas Gerais, Brasil, protocol 2018/16.

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The authors declare that they have no conflict of interest.

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Section Editor: Marta Teixeira

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Torchelsen, F.K.V.d., Silva, T.M., Milagre, M.M. et al. Evaluation of the anti-Trypanosoma cruzi activity in vitro and in vivo of silibinin and silibinin in association to benznidazole. Parasitol Res 120, 1511–1517 (2021). https://doi.org/10.1007/s00436-020-06944-5

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  • DOI: https://doi.org/10.1007/s00436-020-06944-5

Keywords

  • Trypanosoma cruzi
  • Silibinin
  • Benznidazole
  • Drug association
  • In vitro
  • In vivo