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Intracellular development of Trypanosoma cruzi in the presence of metals

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Abstract

Trypanosoma cruzi is transmitted to vertebrate hosts during the feeding of blood-sucking insects. After the invasion of host cells, the parasite resides within the parasitophorous vacuole until to escape to host cytoplasm and to proliferate, establishing an infection. Studies demonstrated that some intracellular parasites have to acquire all essential nutrients as well as transition metals from the host cell to be pathogenic, to maintain the homeostasis and to replicate. The present study investigated the progressive steps of the intracellular parasite development and establishment of infection in the presence of ZnCl2, CdCl2 and HgCl2. LLC-MK2 cells were infected with trypomastigotes during 6–84 h to investigate the steps of intracellular parasite development. After the host cells were infected during 12 h and treated with metals during 24 or 60 h or they were treated for 24 h and cultured for 72 h more to observe the reversibility. The results showed that the non-synchronous invasion of trypomastigotes resulted in an increasing number of intracellular parasites in intermediary forms (until 24 h post-infection), the appearance (from 36 h) and proliferation (84 h) of the amastigotes. The 24 h-treatments were not enough to impair parasite escape to the host cytoplasm and reproduction. However, 60 h of incubations led to a significant reduction in parasite numbers, as well as the reversibility assays. In conclusion, new insights about the intracellular T. cruzi development in the presence of metals were provided, and further studies should be performed to investigate the events involved in parasite death and elimination.

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Acknowledgements

FAPERJ (Fundação de Amparo à Pesquisa do Rio de Janeiro) and CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) (Grant No. E-26/010002612/2014).

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Authors and Affiliations

  1. Laboratory of Tissue and Cell Biology, State University of North Fluminense – Darcy Ribeiro, Campos dos Goytacazes, Rio de Janeiro, 28013-602, Brazil

    Laís Pessanha de Carvalho & Edésio José Tenório de Melo

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  1. Laís Pessanha de Carvalho
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  2. Edésio José Tenório de Melo
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Lais Carvalho performed all assays while Edésio Melo organized the results and he also wrote the paper.

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Correspondence to Edésio José Tenório de Melo.

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Pessanha de Carvalho, L., Tenório de Melo, E.J. Intracellular development of Trypanosoma cruzi in the presence of metals. J Parasit Dis 42, 372–381 (2018). https://doi.org/10.1007/s12639-018-1010-2

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  • DOI: https://doi.org/10.1007/s12639-018-1010-2

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