Atração de miracídios de Schistosoma mansoni por hospedeiros invertebrados: comportamento de miracídios frente a girinos de Hyla fuscovaria

Brasio, Beatriz de Camargo; Magalhães, Luiz Augusto; Miller, Joseph; Carvalho, José Ferreira de

doi:10.1590/s0034-89101985000100003

Cited by 9 publications

(12 citation statements)

References 8 publications

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“…This notion supports the previous results obtained by Brasio et al (1985) who declared that B. tenagophila has low efficiency as an intermediate host for S. mansoni. In contrast, the absence of such markers in the corresponding individuals of B. glabrata could be responsible for the high efficiency of these snails in transmission of schistosomiasis in humans.…”

Section: Discussionsupporting

confidence: 93%

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Schistosome/mollusk: genetic compatibility

Oliveira¹,

Silva²,

Zanotti-Magalhães³

et al. 2008

Genet. Mol. Res.

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AbSTRAcT. Schistosomiasis remains one of the most prevalent parasitic infections and has significant economic and public health consequences in many developing countries. Economic development and improvement in standard of living in these countries are dependent on the elimination of this odious disease. For the control of Schistosomiasis, understanding the host/parasite association is important, since the host parasite relationship is often complex and since questions remain concerning the susceptibility of snails to infection by respective trematodes and their specificity and suitability as hosts for continued parasite development. Thus, the long term aim of this research is to learn more about the genetic basis of the snail/parasite relationship with the hope of finding novel ways to disrupt the transmission of this disease. In the current research, genetic variability among susceptible and resistant strains within and between Biomphalaria glabrata and B. tenagophila was investigated using RAPD-PCR. The results indicate great genetic variations within the two snail species using three different primers 519 ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 7 (2): 518-526 (2008) Schistosome/mollusk: genetic compatibility (intrapopulational variations), while specimens from the same snail species showed few individual differences between the susceptible and resistant strains (interpopulational variation).

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Section: Discussionsupporting

confidence: 93%

“…These results support the data obtained by Brasio et al (1985) who found that B. glabrata has a more efficient power of attraction to miracidia than B. tenagophila. Paraense et al (1983) also pointed out that "the presence of B. glabrata is coincident with the schistosomiasis transmission".…”

Section: Discussionsupporting

confidence: 92%

Schistosome/mollusk: genetic compatibility

Oliveira¹,

Silva²,

Zanotti-Magalhães³

et al. 2008

Genet. Mol. Res.

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“…Paraense and Corrêa (1963), when studying the BH and SJ strains of S. mansoni, described that the intensity of miracidia attraction is dependent on the trematode strain and of the planorbid species. 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.…”

Section: Introductionmentioning

confidence: 73%

“…A glass apparatus composed of two circular chambers (A and B), 30 mm in diameter and 20 mm in depth, attached to a 40 mm × 11 mm channel (C), as described by Brasio et al (1985a) were used in the experiments. Four groups were used in the experiments: Group I -10 specimens of non-infected B. glabrata; Group II -10 specimens of B. glabrata infected with A. costaricensis; Group III -10 samples of SCW of non-infected B. glabrata; Group IV -10 samples of SCW of B. glabrata infected with A. costaricensis.…”

Section: Methodsmentioning

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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“…Posteriormente, Chernin 2,4 (1970,1974) estudou a ação de substâncias emanadas de B. glabrata sobre os miracídios, não evidenciando porém a fonte e a estrutura das substâncias atraentes. Brasio e col. 1 (1985) demonstraram que a atração exercida por B. glabrata foi mais intensa do que a exercida por B. tenagophila quando estes moluscos foram colocados frente a miracídios de populações simpátricas. Verifica Além dos moluscos e miracídios, foi utilizada também água de condicionamento (SCW -"snail conditioned water"), obtida de um "pool" de moluscos (Chernin 3 , 1972), das duas populações de moluscos.…”

Section: Introductionunclassified