Snail-host-finding by Miracidia and Cercariae: chemical hst cues

Haas, Wilfried; Haberl, Bernhard; Kalbe, Martin; Körner, Martina

doi:10.1016/0169-4758(95)80066-2

Cited by 68 publications

(53 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Their large size (adults measure 5-12 mm in length), robustness and relative ease of maintenance in the laboratory (Fried and Huffman 1996) also mean that echinostomes provide potentially useful model material for experimental insight into the trematode neuromuscular system as a target for therapeutic exploitation. Where observed, the adult and developmental stages of echinostomes are highly motile, exhibiting quite elaborate behavioural patterns (Fried and Haseeb 1990;Haas et al 1995) mediated by well-developed sensory modalities and neuromuscular control systems to ensure species survival.…”

Section: Introductionmentioning

confidence: 99%

The musculature and associated innervation of adult and intramolluscan stages of Echinostoma caproni (Trematoda) visualised by confocal microscopy

et al. 2004

View full text Add to dashboard Cite

Gross anatomy of muscle and sensory/motor innervation of adult and intramolluscan developmental stages of Echinostoma caproni have been investigated to ascertain the organisation and the functional correlates of any stage-specific patterns of staining. Using indirect immunocytochemistry to demonstrate neuroactive substances and the phalloidin-fluorescence technique for staining myofibril F-actin, the muscle systems and aminergic and peptidergic innervation of daughter rediae, cercariae, metacercariae, and pre- and post-ovigerous adults were examined and compared using confocal scanning laser microscopy. A complex arrangement of specific muscle fibre systems occurs within the body wall (composed of circular, longitudinal and diagonal fibres), suckers (radial, equatorial, meridional), pharynx (radial, circular), gut caeca (mainly circular), cercarial tail (circular, pseudo-striated longitudinal), and ducts of the reproductive system (circular, longitudinal), presumed to serve locomotor, adhesive, alimentary and reproductive functions. Immunostaining for serotonin (5-HT) and FMRFamide-related peptides (FaRPs) was evident throughout the central (CNS) and peripheral (PNS) nervous systems of all stages, and use of dual-labelling techniques demonstrated separate neuronal pathways for 5-HT and FaRP in both CNS and PNS. FaRP expression in the innervation of the ootype wall was demonstrated only in post-ovigerous worms and not in pre-ovigerous worms, suggesting an involvement of FaRP neuropeptides in the process of egg assembly. Comparison of the present findings with those recorded for other digeneans suggests that muscle organisation and innervation patterns in trematodes are highly conserved.

show abstract

Section: Introductionmentioning

confidence: 99%

The musculature and associated innervation of adult and intramolluscan stages of Echinostoma caproni (Trematoda) visualised by confocal microscopy

et al. 2004

View full text Add to dashboard Cite

show abstract

“…There is a rich literature concerning ways of parasite invasion into their host snails (Haas et al , 1995Kalbe et al 1997;Esch et al 2002). Models of relationships between snails and schistosomes, as well as between snail hosts of the blood trematodes and non-specific echinostomes, have been used for studying the phenomenon of compatibility in the hostparasite interactions (Jeong et al 1980;Bayne 1990;Fryer and Bayne 1990;Sullivan and Hu 1996).…”

Section: Introductionmentioning

confidence: 99%

Infestation of Lymnaea stagnalis by digenean flukes in the Jeziorak Lake

et al. 2006

View full text Add to dashboard Cite

The low number of articles on naturally trematode-infected snails results from the difficulty to obtain the quantitatively representative material. The main aim of our study was to check which age (size) groups of snails are the most susceptible to trematode invasion. Furthermore, we examined in which season the parasite prevalence is the highest. We collected Lymnaea stagnalis individuals in a nearshore zone of the Jeziorak Lake (the longest Polish lake located in northern Poland). The shell height of the snails was measured and the infestation by trematode larvae was determined. The logistic regression has shown that parasite prevalence increased significantly with the snail size (with the individuals >30 mm being the most infected), the distance from the beginning of the year (i.e., month) and the vicinity of summer.

show abstract

“…Indeed, trematode miracidia ®nd and recognize their host snails by responding mainly to snail-emitted chemical signals. Many researchers have tried to analyze these snail-host cues, but these dierent studies have obtained very diverse and often contradictory results (reviewed by MacInnis 1976 ;Saladin 1979;Christensen 1980;Smyth and Halton 1983;Sukhdeo and Mettrick 1987;Haas et al 1995;Haas and Haberl 1997).…”

Section: Introductionmentioning

confidence: 99%

Miracidial host-finding in Fasciola hepatica and Trichobilharzia ocellata is stimulated by species-specific glycoconjugates released from the host snails

Kalbe

Haberl

Haas

1997

Parasitology Research

View full text Add to dashboard Cite

The miracidia of Fasciola hepatica and Trichobilharzia ocellata approach their host snails Lymnaea truncatula and L. stagnalis by increasing their rate of change of direction (RCD) in increasing gradients of snail-conditioned water (SCW), and they perform a turnback swimming in decreasing gradients. Both hostfinding responses in both species were induced by glycoconjugates with a molecular weight of > 30 kDa that were sensitive to hydrolysis with pronase E and oxidation with NaIO4. Alkaline cleavage revealed that they contained carbohydrates linked O-glycosidically via serine and N-acetylgalactosamine. Miracidia clearly preferred SCW from their specific host snail versus other sympatric snail species and did not respond to water conditioned with fish, tadpoles, or leeches. Differences in the chemical characteristics of SCW from the intermediate hosts L. truncatula and L. stagnalis could be shown by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, blotting, and subsequent carbohydrate detection. The first step of purification of the effective signaling SCW components from both snail species was achieved by ion-exchange chromatography.

show abstract

Snail-host-finding by Miracidia and Cercariae: chemical hst cues

Cited by 68 publications

References 20 publications

The musculature and associated innervation of adult and intramolluscan stages of Echinostoma caproni (Trematoda) visualised by confocal microscopy

The musculature and associated innervation of adult and intramolluscan stages of Echinostoma caproni (Trematoda) visualised by confocal microscopy

Infestation of Lymnaea stagnalis by digenean flukes in the Jeziorak Lake

Miracidial host-finding in Fasciola hepatica and Trichobilharzia ocellata is stimulated by species-specific glycoconjugates released from the host snails

Contact Info

Product

Resources

About