Journal Title
Title of Journal: Parasitol Res
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Abbravation: Parasitology Research
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Publisher
Springer-Verlag
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Authors: Miguel S CorrêadaSilva Patrícia Fampa Luiz P Lessa Edalton dos Reis Silva Jacenir Reis dos Santos Mallet Elvira M B Saraiva Maria Cristina M Motta
Publish Date: 2006/03/30
Volume: 99, Issue: 4, Pages: 384-391
Abstract
Monoxenous trypanosomatids inhabit invertebrate hosts throughout their life cycle However there have been cases of HIVpositive patients who have presented opportunistic infections caused by these protozoa offering new perspectives to the study of interactions between monoxenics and hematophagous insect vectors Some monoxenous trypanosomatids present a symbiotic bacterium in the cytoplasm which seems to promote biochemical and morphological changes in the host trypanosomatids such as alterations in plasma membrane carbohydrates and the reduction of the paraxial rod In this work we investigated the colonization of Aedes aegypti with Blastocrithidia culicis an endosymbiontbearing trypanosomatid B culicis remained in the insect digestive tract for 38 days after feeding Optical microscopy analysis revealed an infection process characterized by a homogenous distribution of the trypanosomatid along the midgut epithelium no preferential interaction of protozoa with any cell type was observed Ultrastructural analysis showed that during the colonization process trypanosomatids interacted mainly with midgut cells through their flagellum which penetrates the microvilli preferentially near the tight junctions Prolonged infections promoted insect midgut degradation culminating with the arrival of protozoa in the hemocel By demonstrating B culicis colonization in a bloodsucking insect we suggest that vector transmission of monoxenous trypanosomatids to vertebrate host may occur in natureThe authors would like to thank Laboratório de Fisiologia e Controle de Vetores LAFICAVE Fundação Oswaldo Cruz Rio de Janeiro for the Aedes aegypti supply and Suzete Bressan Nascimento IBCCF Universidade Federal do Rio de Janeiro for the statistical analyses and discussion The experiments comply with the current laws of Brazil This work was supported by CNPq and FAPERJ
Keywords:
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