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Cysteine peptidases in Herpetomonas samuelpessoai are modulated by temperature and dimethylsulfoxide-triggered differentiation

Published online by Cambridge University Press:  07 January 2009

F. M. Pereira
Affiliation:
Departamento de Microbiologia Geral, Instituto de Microbiologia Prof. Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
C. G. R. Elias
Affiliation:
Departamento de Microbiologia Geral, Instituto de Microbiologia Prof. Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
C. M. d'Avila-Levy
Affiliation:
Laboratório de Biologia Molecular e Doenças Endêmicas, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
M. H. Branquinha
Affiliation:
Departamento de Microbiologia Geral, Instituto de Microbiologia Prof. Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
A. L. S. Santos*
Affiliation:
Departamento de Microbiologia Geral, Instituto de Microbiologia Prof. Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
*
*Corresponding author: Laboratório de Estudos Integrados em Bioquímica Microbiana, Departamento de Microbiologia Geral, Instituto de Microbiologia Prof. Paulo de Góes (IMPPG), Bloco I-subsolo, Centro de Ciências da Saúde (CCS), Universidade Federal do Rio de Janeiro (UFRJ), Av. Carlos Chagas Filho, 373, Cidade Universitária, Rio de Janeiro, RJ21941-902, Brazil. Tel: +55 21 2562 6740. Fax: +55 21 2560 8344. E-mail: andre@micro.ufrj.br

Summary

Cysteine peptidases of protozoa have been implicated in a variety of biological events, and the expression of these enzymes is modulated in response to distinct stimuli, including environmental changes and differentiation. In the present work, we have examined the expression of cysteine peptidases from Herpetomonas samuelpessoai grown at distinct temperatures and during dimethylsulfoxide (DMSO)-elicited differentiation. We demonstrated that a 45 kDa cysteine peptidase had its activity reduced during the parasite growth at 37°C in comparison to 26°C, and when cultured up to 72 h in the presence of DMSO. The modulation in the 45 kDa cysteine peptidase expression is connected to the differentiation process, since both temperature and DMSO are able to trigger the promastigote to paramastigote transformation in H. samuelpessoai. The possible immunological similarity of H. samuelpessoai proteins with well-known cysteine peptidases produced by trypanosomatid pathogens, including cruzipain (Trypanosoma cruzi) and cysteine peptidase b (cpb) from Leishmania mexicana, was also investigated, as well as with calpain molecules. The protein cellular lysate of H. samuelpessoai reacted with antibodies raised against cpb of L. mexicana and calpain of Drosophila melanogaster; however, no reaction was observed against cruzipain. The 35 kDa cpb-like protein had its expression diminished in DMSO-treated parasites, while the 80 kDa calpain-like molecule was enhanced and an additional 30 kDa calpain-related polypeptide was exclusively observed in these cells. Fluorescence microscopy and flow cytometry analyses corroborated these data. The results described above add H. samuelpessoai to the list of parasites whose differentiation seems to be correlated with cysteine peptidase expression.

Type
Research Article
Copyright
Copyright © 2009 Cambridge University Press

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