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O2 consumption rates along the growth curve: new insights into Trypanosoma cruzi mitochondrial respiratory chain

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Abstract

Understanding the energy-transduction pathways employed by Trypanosoma cruzi, the etiological agent of Chagas disease, may lead to the identification of new targets for development of a more effective therapy. Herein, the contribution of different substrates for O2 consumption rates along T. cruzi epimastigotes (Tulahuen 2 and Y strains) growth curve was evaluated. O2 consumption rates were higher at the late stationary phase not due to an increase on succinate-dehydrogenase activity. Antimycin A and cyanide did not totally inhibit the mitochondrial respiratory chain (MRC). Malonate at 10 or 25 mM was not a potent inhibitor of complex II. Comparing complex II and III, the former appears to be the primary site of H2O2 release. An update on T. cruzi MRC is presented that together with our results bring important data towards the understanding of the parasite’s MRC. The findings mainly at the stationary phase could be relevant for epimastigotes transformation into the metacyclic form, and in this sense deserves further attention.

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Authors and Affiliations

  1. Departamento de Bioquímica, Universidade Estadual de Campinas, Instituto de Biologia, Caixa Postal: 6109, CEP: 13083-862, Campinas, São Paulo, Brazil

    Thiago M. Silva, Eduardo F. Peloso, Simone C. Vitor, Luis H. G. Ribeiro & Fernanda R. Gadelha

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  1. Thiago M. Silva
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  2. Eduardo F. Peloso
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  3. Simone C. Vitor
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  4. Luis H. G. Ribeiro
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  5. Fernanda R. Gadelha
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Correspondence to Fernanda R. Gadelha.

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Thiago M. Silva and Eduardo F. Peloso contributed equally to this article

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Silva, T.M., Peloso, E.F., Vitor, S.C. et al. O2 consumption rates along the growth curve: new insights into Trypanosoma cruzi mitochondrial respiratory chain. J Bioenerg Biomembr 43, 409–417 (2011). https://doi.org/10.1007/s10863-011-9369-0

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  • DOI: https://doi.org/10.1007/s10863-011-9369-0

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