Activity of praziquantel on in vitro transformed Schistosoma mansoni sporocysts

Memórias do Instituto Oswaldo Cruz

Aca Mattos²  Jr Kusel¹  Pfp Pimenta¹  Pmz Coelho² 

[1] ,Fiocruz Centro de Pesquisas René-Rachou Laboratório de Esquistossomose

关键词: praziquantel;    fluorescence;    Hoechst 33258;    LysoTracker Red;    lectin of Glycine max;    sporocysts;    Schistosoma mansoni;   

DOI  :  10.1590/S0074-02762006000900044

来源: SciELO

【 摘 要 】

Praziquantel (PZQ) is effective against all the evolutive phases of Schistosoma mansoni. Infected Biomphalaria glabrata snails have their cercarial shedding interrupted when exposed to PZQ. Using primary in vitro transformed sporocysts, labeled with the probe Hoechst 33258 (indicator of membrane integrity), and lectin of Glycine max (specific for carbohydrate of N-acetylgalactosamine membrane), we evaluated the presence of lysosomes at this evolutive phase of S. mansoni, as well as the influence of PZQ on these acidic organelles and on the tegument of the sporocyst. Although the sporocyst remained alive, it was observed that there was a marked contraction of its musculature, and there occurred a change in the parasite's structure. Also, the acidic vesicles found in the sporocysts showed a larger delimited area after contact of the parasites with PZQ. Damages to the tegument was also observed, as show a well-marked labeling either with Hoechst 33258 or with lectin of Glycine max after contact of sporocysts with the drug. These results could partially explain the interruption/reduction mechanism of cercarial shedding in snails exposed to PZQ.

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