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   <subfield code="a">Effects of platelet-activating factor on the interaction of Trypanosoma cruzi with Rhodnius prolixus</subfield>
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   <subfield code="c">[Luciana Zimmermann, Evelize Folly, Marta Gomes, Daniela Alviano, Celuta Alviano, Fernando Silva-Filho, Geórgia Atella, Angela Lopes]</subfield>
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   <subfield code="a">We investigated the effects of platelet-activating factor (PAF) on the interaction of Trypanosoma cruzi with Rhodnius prolixus. The parasites (epimastigotes) were treated with PAF and/or WEB 2086 (PAF antagonist) for 1h prior to the interaction experiments. PAF stimulated both in vivo and ex vivo interactions between T. cruzi and R. prolixus while WEB 2086 abrogated these effects. PAF-treated epimastigotes also showed an increase in surface negativity and in the amount of surface sialic acid. Neither of these effects was observed when the epimastigotes were treated with neuraminidase following PAF treatment. In the ex vivo interaction experiments, the number of epimastigotes bound to the midguts of the insects was reduced when the epimastigotes had been treated with neuraminidase. We conclude that PAF modulates the interaction of T. cruzi with R. prolixus by altering the amount of sialyl residues at the surface of the parasite.</subfield>
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