L-proline is essential for the intracellular differentiation of Trypanosoma cruzi

L-proline is essential for the intracellular differentiation of Trypanosoma cruzi

Autor Tonelli, Renata R. Google Scholar
Silber, Ariel M. Google Scholar
Almeida-de-Faria, Martinez Google Scholar
Hirata, Izaura Y. Autor UNIFESP Google Scholar
Colli, Walter Google Scholar
Alves, Maria Julia M Google Scholar
Instituição Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Resumo Using as the host cell, a proline-requiring mutant of Chinese hamster ovary cell (CHO-K1), it was possible to arrest the differentiation of amastigote forms of Trypanosoma cruzi at the intermediate intracellular epimastigote-like stage. Complete differentiation to the trypomastigote stage was obtained by addition of L-proline to the medium. This effect was more pronounced using the T. cruzi CL-14 clone that differentiates fully at 33degreesC (permissive temperature) and poorly at 37degreesC (restrictive temperature). A synchronous differentiation of T. cruzi inside the host-cell is then possible by temperature switching in the presence of proline. It was found that differentiation of intracellular epimastigotes and trypomastigote bursting were proline concentration dependent. the intracellular concentration of proline was measured as well as the transport capacity of proline by each stage of the parasite. Amastigotes have the highest concentration of free proline (8.09 +/- 1.46 mM) when compared to trypomastigotes (3.81 +/- 1.55) or intracellular epimastigote-like forms (0.45 +/- 0.06 mM). in spite of having the lowest content of intracellular free proline, intracellular epimastigotes maintained the highest levels of L-proline transport compared to trypomastigotes and intracellular amastigotes, providing evidence for a high turnover for the L-proline pool in that parasite stage. This is the first report to establish a relationship between proline concentration and intracellular differentiation of Trypanosoma cruzi in the mammalian host.
Idioma Inglês
Data de publicação 2004-08-01
Publicado em Cellular Microbiology. Oxford: Blackwell Publishing Ltd, v. 6, n. 8, p. 733-741, 2004.
ISSN 1462-5814 (Sherpa/Romeo, fator de impacto)
Publicador Blackwell Publishing Ltd
Extensão 733-741
Fonte http://dx.doi.org/10.1111/j.1462-5822.2004.00397.x
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000222462200004
Endereço permanente http://repositorio.unifesp.br/handle/11600/27843

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