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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estudo morfológico e ultraestrutural da glândula salivar de Rhodnius prolixus, Panstrongylus megistus e Triatoma infestans (Hemiptera, Triatominae)

Anhê, Ana Carolina Borella January 2011 (has links)
Submitted by Nuzia Santos (nuzia@cpqrr.fiocruz.br) on 2013-01-25T10:55:52Z No. of bitstreams: 1 Ana Carolina borella anhe.pdf: 14934696 bytes, checksum: 8837678c96ca7fb7e6fb4a64a9f5b3a8 (MD5) / Made available in DSpace on 2013-01-25T10:55:52Z (GMT). No. of bitstreams: 1 Ana Carolina borella anhe.pdf: 14934696 bytes, checksum: 8837678c96ca7fb7e6fb4a64a9f5b3a8 (MD5) Previous issue date: 2011 / Os triatomíneos são vetores do Trypanosoma cruzi e do Trypanosoma rangeli. Apresentam hábito hematófago durante todo o ciclo de vida. Durante o repasto, secretam uma saliva que antagoniza os sistemas hemostático, inflamatório e imunológico do hospedeiro vertebrado. A fim de caracterizar os aspectos morfológicos da glândula salivar, foi desenvolvido um estudo do crescimento desse órgão em triatomíneos de três espécies: Rhodnius prolixus, Panstrongylus megistus e Triatoma infestans. Os insetos foram cedidos pelo insetário do Laboratório de Triatomíneos e Epidemiologia da Doença de Chagas (CPqRR - FIOCRUZ). As glândulas salivares foram dissecadas e processadas para microscopia de luz, de fluorescência, laser confocal e eletrônica de varredura. Os resultados indicaram que a glândula é morfologicamente semelhante durante todo o ciclo de vida do inseto, sendo formada por um par de lobos, cada qual formado por dois (R. prolixus) ou três lóbulos (P. megistus e T. infestans). Durante o ciclo de vida, a glândula quadruplicou o seu tamanho inicial, devido ao crescimento celular, visto que o número de células permaneceu constante. Os lóbulos se mostraram formados por um epitélio simples que delimita o lúmen (onde a saliva é armazenada), revestidos por fibras musculares (cuja contração permite a liberação da saliva), traquéias e nervos. Serotonina apresentou intensa atividade na glândula das três espécies analisadas durante alimentação. Em R. prolixus, atividade dopaminérgia e de tirosina-hidroxilase (enzima da via das catecolaminas) também foram observadas. Dobras de membrana foram visualizadas na região apical das células e associadas ao aumento da área de secreção (tipo merócrina). Além disso, a presença de vesículas de secreção e células inteiras (estas observadas apenas em R. prolixus) no lúmen indicaram secreções do tipo apócrina e holócrina, respectivamente. Bactérias Gram-negativas e Gram-positivas foram observadas dentro das células e do lúmen do lóbulo posterior de T. infestans. / Triatomines are vectors of Trypanosoma cruzi e Trypanosoma rangeli. They are hematophagous during all life cycle. During the bite, they secrete saliva that antagonizes hemostatic, inflammatory and immunological systems imposed by the vertebrate host. In order to understand gland structure, a study of the organ growth was carried out with three important species: Rhodnius prolixus, Panstrongylus megistus e Triatoma infestans. The triatomines were provided by the Insectary of the Insectary of the Laboratory of Triatomines and Epidemiology of Chagas Disease (CPqRR - FIOCRUZ). Glands were dissected and processed routinely for light, fluorescence, laser scanning confocal and scanning electron microscopies. The results indicated that the gland is very similar during all cycle. It is formed by a pair of lobes, each one formed by two (R. prolixus) or three lobules (P. megistus e T. infestans). During the life cycle, salivary gland grew four times. This happened because cell volume increased, since the number of cells was the same during all life. The results showed that lobules are formed by a single epithelium that delimits a large central lumen (where saliva is stored), covered by muscle fibers (gland contraction and saliva releasing), trachea and nerves. Serotonin was considered an important neurotransmitter released during feeding, since it showed intense activity in the gland of the three species. In R. prolixus, activity of dopamine and tyrosine-hydroxylase (indicative of the presence of catecholamines) were also visualized. Membrane infoldings were observed in the apical surface of the cells, increasing the membrane area available for secretion (merocrine type). In addition, the presence of secretion vesicles and entire cells in the lumen (just in R. prolixus) indicated aprocrine and holocrine types of secretion, respectively. Gram-negative and Gram-positive bacteria were observed inside the cells and in the lumen of the posterior lobule of T. infestans.

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