Aspectos imunológicos e parasitológicos em Biomphalaria tenagophila infectadas por Schistosoma mansoni e outros Digenea

Balan, Doralice de Souza Luro; Magalhães, Luiz Augusto; Piedrabuena, Aquiles Eugênico

doi:10.1590/s0034-89101993000600004

Cited by 6 publications

(7 citation statements)

References 31 publications

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“…But, when they were incubated only with plasma, they were not destroyed. Balan et al (1993) did not find an amoebocitary reaction around degenerated sporocysts, suggesting that factors of the plasma might be involved in the cases.…”

Section: Introductionmentioning

confidence: 76%

Behaviour of albino and melanic variants of Biomphalaria glabrata Say, 1818 (Mollusca: Planorbidae) following infection by Schistosoma mansoni Sambon, 1907

Allegretti

et al. 2009

Braz. J. Biol.

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The behaviour of the albino and melanic variants of Biomphalaria glabrata of Belo Horizonte (MG. Brazil) was studied comparatively, in terms of their respective susceptibilities to infection by Schistosoma mansoni of the same origin, through observation of the elimination of cercariae for a three-month period and the calculation of mortality and infection rates, in control and in infected snails. The number of amoebocytes, granulocytes and hyalinocytes in the circulating hemolymph during different periods of infection was analyzed. The evolution of the infection in the tissues was observed by means of histological cross-sections. The melanic variant showed greater susceptibility to infection and a higher mortality rate. The albino variant showed a higher number of circulating amoebocytes, both granulocytes and hyalinocytes. A higher number of degenerated sporocysts were seen in the histological cross-sections of the albino variant. The results suggest that the melanic variant of B. glabrata was more susceptible to infection by S. mansoni than was the albino variant.Keywords: Biomphalaria glabrata, amoebocytes, Schistosoma mansoni, sporocysts. Comportamento de Biomphalaria glabrata variantes albina e melânica frente à infecção pelo Schistosoma mansoni ResumoFoi estudado comparativamente o comportamento das variantes albina e melânica de Biomphalaria glabrata de Belo Horizonte (MG. Brasil), em relação à susceptibilidade à infecção pelo Schistosoma mansoni de mesma origem, através da observação da eliminação de cercárias por um período de três meses e a verificação das taxas de mortalidade e infecção nos moluscos controles e infectados. Analisou-se também, o número de amebócitos granulócitos e hialinócitos na hemolinfa circulante em diferentes períodos de infecção. A evolução da infecção nos tecidos foi observada através de cortes histológicos. A variante melânica apresentou maior susceptibilidade à infecção e maior taxa de mortalidade. A variante albina apresentou maior número de amebócitos circulantes, tanto granulócitos quanto hialinócitos. Nos cortes histológicos foi verificado maior número de esporocistos degenerados na variedade albina. Por estes resultados sugere-se que nas populações estudadas a variante melânica de B. glabrata, foi mais susceptível à infecção pelo S. mansoni.

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Section: Introductionmentioning

confidence: 76%

Behaviour of albino and melanic variants of Biomphalaria glabrata Say, 1818 (Mollusca: Planorbidae) following infection by Schistosoma mansoni Sambon, 1907

Allegretti

et al. 2009

Braz. J. Biol.

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“…The death of sporocysts was mainly followed by amebocyte reactions, although unviable sporocysts without an amebocyte reaction were observed in almost all specimens and infection periods ( Figures 2C, 3 and 4E). Although an amebocyte reaction is the main defense mechanism (Lie et al, 1980), the presence of degenerating larvae without an amebocyte reaction has been reported in mollusks that were simultaneously infected with S. mansoni and another trematode species (Balan et al, 1993). The greater damage to parasitized tissues, either from more penetration of BH miracidia or the amebocyte reaction of the mollusk, could explain the higher mortality of B. amazonica when it was exposed to the BH strain.…”

Section: Discussionmentioning

confidence: 99%

Host-parasite relationship between Biomphalaria amazonica (Paraense, 1966) and Schistosoma mansoni (Sambon, 1907)

et al. 2016

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Biomphalaria amazonica is a planorbid species considered a potential host of Schistosoma mansoni. It is widely distributed in the Neotropical zone, particularly in the North and Centre-West of Brazil and in the North of Bolivia. The aim of the present study was to determine the host-parasite relationship between B. amazonica and S. mansoni (BH and SJ strains). Specimens of B. amazonica and their snail-conditioned water were examined in terms of their ability to attract miracidia. The infectivity of the mollusks was determined by exposing them to 20 miracidia of both strains. Sporocyst development and amebocyte reactions were studied after each mollusk specimen was exposed to 100 miracidia. Although no cercariae were eliminated, specimens of B. amazonica proved capable of attracting 77% of the miracidia they were exposed to. Viable sporocysts with no amebocyte reaction were found 96 hours after the exposure to miracidia. These results indicate the susceptibility of B. amazonica to the BH and SJ strains of S. mansoni, and therefore demonstrate the importance of this planorbid species as a potential vector of the trematode in the areas where it occurs.Keywords: schistosomiasis, susceptibility, BH strain, SJ strain. Relação parasito-hospedeiro entre

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“…Mollusks naturally infected by cercariae of species of Echinostomatidae and by aculeate cercariae of Distomata (Digenea) presented partial resistance to the development of experimental superinfection with S. mansoni, with resistance rates of 73 and 87%, respectively. According to Balan et al (1993), samples of B. tenagophila naturally parasitised by trematodes and experimentally superinfected with S. mansoni, showed resistance to the development of sporocysts of S. mansoni. However, Yousif and Lämmler (1977) verified that previous infection of B. glabrata with A. cantonensis did not inhibit nor delay the subsequent infection of the mollusks with S. mansoni.…”

Section: Discussionmentioning

confidence: 99%

“…Brasio et al (1985a) verified that, in addition to SCW, the mucus and the feces of the mollusks also exerted strong attraction to the miracidia. Machado et al (1988) and Balan et al (1993) showed that the infection by S. mansoni did not develop in B. tenagophila previously infected by furcicercariae either with or without ocellli. The presence of primary or secondary sporocysts of S. mansoni in B. glabrata (Seta et al, 1993;Magalhães et al, 1997) induced the loss of the attractiveness to miracidia, which results in an advantage for the trematode, for it is more attracted to non-parasited mollusks.…”

Section: Introductionmentioning

confidence: 99%

Attractionof Schistosoma mansoni Sambon, 1907 miracidia to Biomphalaria glabrata (Say, 1818) in the presence of Angiostrongylus costaricensis Morera and Céspedes, 1971 infection

Guerino

Linhares²,

Magalhães³

et al. 2009

Braz. J. Biol.

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The attraction exerted by Biomphalaria glabrata infected with Angiostrongylus costaricensis on Schistosoma mansoni miracidia of the BH strain was tested, using a glass apparatus composed by two circular chambers connected to a channel. One mollusk or a sample of a snail conditioning water (SCW) was placed in one of the chambers, randomly selected, and the remaining of the apparatus was filled with chlorine-free water. Ten miracidia were placed in the centre of the channel and their behaviour was observed for 15 minutes. Ten replicates were made for each treatment (snail or SCW), using different specimens of mollusks or different samples of SCW. Mollusks infected with A. costaricensis attracted significantly less S. mansoni miracidia than non-infected B. glabrata. In addition, miracidia were also significantly more attracted to SCW from mollusks infected with A. costaricensis.Keywords: Angiostrongylus costaricensis, Schistosoma mansoni, Biomphalaria glabrata, miracidia. Atração de miracídios de Schistosoma mansoni Sambon, 1907 por Biomphalaria glabrata (Say, 1818) infectada por Angiostrongylus costaricensis Morera and Céspedes, 1971Resumo Utilizando-se um artefato de vidro composto por duas câmaras unidas por um canal, testamos a atração miraxonal exercida por Biomphalaria glabrata infectada por Angiostrongylus costaricensis sobre miracídios de Schistosoma mansoni da linhagem BH. Um molusco ou uma amostra de sua água de condicionamento (SCW) foi colocado aleatoriamente em uma das câmaras, sendo o restante do artefato preenchido com água declorada. Dez miracídios foram colocados no centro do canal e seu comportamento foi observado por 15 minutos. Foram feitas dez replicações de cada experimento utilizando-se espécimes de moluscos ou de amostras de SCW diferentes. Moluscos infectados com A. costaricensis atraíram significativamente menos miracídios de S. mansoni que B. glabrata não infectada. Além disso, miracídios foram significativamente mais atraídos pela SCW de moluscos infectados com A. costaricensis.

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Aspectos imunológicos e parasitológicos em Biomphalaria tenagophila infectadas por Schistosoma mansoni e outros Digenea

Cited by 6 publications

References 31 publications

Behaviour of albino and melanic variants of Biomphalaria glabrata Say, 1818 (Mollusca: Planorbidae) following infection by Schistosoma mansoni Sambon, 1907

Behaviour of albino and melanic variants of Biomphalaria glabrata Say, 1818 (Mollusca: Planorbidae) following infection by Schistosoma mansoni Sambon, 1907

Host-parasite relationship between Biomphalaria amazonica (Paraense, 1966) and Schistosoma mansoni (Sambon, 1907)

Attractionof Schistosoma mansoni Sambon, 1907 miracidia to Biomphalaria glabrata (Say, 1818) in the presence of Angiostrongylus costaricensis Morera and Céspedes, 1971 infection

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