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We report a study on the variations in the protein expression profiles of tachyzoites and bradyzoites of Neospora caninum. The in vitro stage conversion of N. caninum-infected Vero cells was induced by continuous treatment of infected cultures with 70 μM sodium nitroprusside (SNP) for up to 9 days. The stage conversion indicated by the expression of the bradyzoite-specific antigen BAG1 was analyzed by immunofluoresence assay. Morphological changes between tachyzoites and bradyzoites and localization of nuclei were demonstrated by transmission electron microscopy. Notably, we showed the differential protein expression profiles of tachyzoites and bradyzoites of N. caninum upon treatment with SNP. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis indicated different protein patterns between tachyzoites and bradyzoites. Furthermore, Western blotting using rabbit polyclonal antibodies directed against tachyzoites revealed several reactive bands, one of which represented a tachyzoite-specific antigen of ∼40 kDa remarkably expressed in the tachyzoite stage, but was absent from bradyzoites. Moreover, rabbit polyclonal serum raised against bradyzoites recognized a significant increased expression of an antigen with a MW of ∼25 kDa in bradyzoites by Western blotting, suggesting that this protein is specifically expressed at the bradyzoite stage. Taken together, our data showed that differential protein expression profiling is a useful tool for discriminating between the two stages during tachyzoite–bradyzoite interconversion in N. caninum infections.
Parasitology Research – Springer Journals
Published: Jul 3, 2008
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