Description and surface topography of the cercaria of Austrobilharzia sp. (Digenea: Schistosomatidae)

Abdul-Salam, J.; Sreelatha, B. S.

doi:10.1016/j.parint.2003.10.001

Cited by 20 publications

(15 citation statements)

References 23 publications

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“…The total number of nuclei in the tail is 34.4±0.2 (N=10). n, nucleus; nc, nerve cord; arrow, 5HT-IR neurones, arrow head, α-tubulin-IR processes conformity with that of sensory receptors described by another authors (Stenko 1985;Kostadinova 1993;Bell et al 1997;Abdul-Salam and Sreelatha 2004). Immunostaining (IS) with anti-α-tubulin has the advantage that it can be combined with other IS techniques, thereby enabling comparisons between the sensory receptors and the general NMS.…”

Section: Discussionsupporting

confidence: 78%

The neuro-muscular system in cercaria with different patterns of locomotion

et al. 2010

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The neuro-muscular system (NMS) of cercariae with different swimming patterns was studied with immunocytochemical methods and confocal scanning laser microscopy. Specimens of the continuously swimming Cercaria parvicaudata, Maritrema subdolum and Himasthla elongata were compared with specimens of the intermittently swimming Cryptocotyle lingua and the attached Podocotyle atomon. The patterns of F-actin in the musculature, 5-HT immunoreactive (-IR), FMRFamide-IR neuronal elements, α-tubulin-IR elements in the nervous and sensory systems and DAPI-stained nuclei were investigated. The general plan of the NMS was similar in all cercariae studied. No major structural differences in the patterns of muscle fibres were observed. However, in the tail of C. lingua, transverse muscle fibres connecting the bands of longitudinal muscles were found. No major structural differences in the 5-HT- or FMRFamide-IR nervous systems were observed. The number of 5-HT-IR neurones in the cercarial bodies varied between 12 and 14. The number and distribution of the α-tubulin-IR processes on the cercarial bodies and tails differed from each other. The relation between the number and structure of the α-tubulin-IR processes and the host finding strategy of the cercariae is discussed. A detailed schematic picture of the NMS in the tails of C. lingua and M. subdolum is presented.

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Section: Discussionsupporting

confidence: 78%

The neuro-muscular system in cercaria with different patterns of locomotion

et al. 2010

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“…Bayssade-Dufour et al 1989, Niewiadomska 1996. In bird schistosomes, chaetotaxy of cercariae was described for one species of the genus Austrobilharzia (Abdul-Salam and Screelatha 2004) and several species of the genus Trichobilharzia: e.g. T. ocellata sensu lato (Richard 1971, Kock and Böckeler 1998, Gay et al 1999, T. australis (Blair and Islam 1983), T. szidati (Koláøová and Horák 1996), T. franki (Kock andBöckeler 1998, Gay et al 1999) and T. regenti (Horák et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Cercarial dimensions and surface structures as a tool for species determination of Trichobilharzia spp.

Podhorský¹,

Huůzová²,

Mikeš

et al. 2009

Acta Parasitologica

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Cercariae of bird schistosomes are traditionally considered to be very similar in their morphological characteristics. In order to solve the problem, we tested some methods which might be suitable for cercarial differentiation. Fourteen isolates of three Trichobilharzia species (T. szidati, T. franki, T. regenti) occurring sympatrically in Central Europe were used. Dimensions of individual cercariae do not represent a useful criterion for identification, because the intraspecific variability exceeds the interspecific one. On the other hand, chaetotaxy appears a promising way for discrimination, although some sensory papillae do not stain sufficiently with silver nitrate. The papillary pattern (i.e. number and relative position of papillae) is specific for all Trichobilharzia species studied by us. Therefore, we compiled an identification key for the three Trichobilharzia species. In addition, we tried to find species-specific surface saccharide epitopes; none of the labeled lectin probes can be used as a speciesspecific marker.

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“…Analogous structures have also been described in cercariae of S. mansoni (Dorsey et al 2002). cercariae using scanning electron microscopy (Abdul-Salam & Sreelatha, 2004). Moreover, in a recent study more than 13 types of structural sensory receptors were identified in the tegument of Austrobilharzia sp.…”

Section: E L L S I G N a L L I N G: P U T A T I V E R O L E S I N Lmentioning

confidence: 61%

Signal transduction in larval trematodes: putative systems associated with regulating larval motility and behaviour

2006

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The multi-host lifestyle of parasitic trematodes necessitates their ability to communicate with their external environment in order to invade and navigate within their hosts' internal environment. Through recent EST and genome sequencing efforts, it has become clear that members of the Trematoda possess many of the elaborate signal transduction systems that have been delineated in other invertebrate model systems like Drosophila melanogaster and Caenorhabditis elegans. Gene homologues representing several well-described signal receptor families including receptor tyrosine kinases, receptor serine tyrosine kinases, G protein-coupled receptors and elements of their downstream signalling systems have been identified in larval trematodes. A majority of this work has focused on the blood flukes, Schistosoma spp. and therefore represents a narrow sampling of the diverse digenean helminth taxon. Despite this fact and given the substantial evidence supporting the existence of such signalling systems, the question then becomes, how are these systems employed by larval trematodes to aid them in interpreting signals received from their immediate environment to initiate appropriate responses in cells and tissues comprising the developing parasite stages? High-throughput, genome-wide analysis tools now allow us to begin to functionally characterize genes differentially expressed throughout the development of trematode larvae. Investigation of the systems used by these parasites to receive and transduce external signals may facilitate the creation of technologies for achieving control of intramolluscan schistosome infections and also continue to yield valuable insights into the basic mechanisms regulating motility and behaviour in this important group of helminths.

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Description and surface topography of the cercaria of Austrobilharzia sp. (Digenea: Schistosomatidae)

Cited by 20 publications

References 23 publications

The neuro-muscular system in cercaria with different patterns of locomotion

The neuro-muscular system in cercaria with different patterns of locomotion

Cercarial dimensions and surface structures as a tool for species determination of Trichobilharzia spp.

Signal transduction in larval trematodes: putative systems associated with regulating larval motility and behaviour

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