Ultrastructure and chaetotaxy of sensory eeceptors in the cercaria of a species of Allopodocotyle Pritchard, 1966 (Digenea: Opecoelidae)

Bogéa, Tami; Caira, Janine N.

doi:10.1590/s0074-02762001000200012

Cited by 14 publications

(6 citation statements)

References 18 publications

(29 reference statements)

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“…The silver nitrate impregnation technique is a standard for visualization of chaetotaxy in cercariae (Ginetsinskaya & Dobrovolskij, 1963; Antonelli et al ., 2014). Some sensory receptors become visible due to silver nitrate but are lost in scanning electron microscope images (Bogéa & Caira, 2001a) and vice versa (Denisova & Shchenkov, 2018) (table 1). Using immunostaining alone also does not give entirely accurate results (fig.…”

Section: Discussionmentioning

confidence: 99%

“…Sensory papillae of C. parvicaudata are mainly represented by uniciliate nerve endings surrounded by the tegumental collars (figs 1–3). This type of papillae is common among both cercariae and adults of various digenean families (Bogéa & Caira, 2001, 2001a, b; Sohn et al ., 2002; Žd’árská & Nebesářová, 2003; Antonelli et al ., 2014). The sensory endings of the oral sucker of C. parvicaudata are also of the same type (fig.…”

Section: Discussionmentioning

confidence: 99%

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New data on the nervous system ofCercaria parvicaudataStunkard & Shaw, 1931 (Trematoda: Renicolidae): revisiting old hypotheses

Denisova

Shchenkov

2019

J. Helminthol.

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Data on the interposition of the immunoreactive nerve cords in Cercaria parvicaudata Stunkard & Shaw, 1931 (Trematoda: Renicolidae) and its chaetotaxy were obtained. The nervous system of C. parvicaudata was described using immunostaining of 5-hydroxytryptamine and FMRFamide immunoreactive nerve elements. The morphology and distribution of sensory receptors were analysed using scanning electron microscopy and the silver nitrate impregnation technique. Our integrated approach to the study of the nervous system revealed a clear colocalization of surface papillae with nerve cords and commissures in C. parvicaudata. The structure of the nervous system in C. parvicaudata differs partly from the classical model that defines the entire nomenclature of chaetotaxy.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

New data on the nervous system ofCercaria parvicaudataStunkard & Shaw, 1931 (Trematoda: Renicolidae): revisiting old hypotheses

Denisova

Shchenkov

2019

J. Helminthol.

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“…Sensory papillae had been found in the oral and ventral suckers of O. viverini metacercariae [122]. Several types of sensory structures (sensory receptors) have also been described at the body surface of the cercariae of several trematodes [123]. There is evidence that serotonin is present in the sensory nerve endings of trematodes and cestodes [37,94].…”

Section: Sensory Structures (Papillae)mentioning

confidence: 99%

Serotonin Signalling in Flatworms: An Immunocytochemical Localisation of 5-HT7 Type of Serotonin Receptors in Opisthorchis felineus and Hymenolepis diminuta

2021

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The study is dedicated to the investigation of serotonin (5-hydroxytryptamine, 5-HT) and 5-HT7 type serotonin receptor of localisation in larvae of two parasitic flatworms Opisthorchis felineus (Rivolta, 1884) Blanchard, 1895 and Hymenolepis diminuta Rudolphi, 1819, performed using the immunocytochemical method and confocal laser scanning microscopy (CLSM). Using whole mount preparations and specific antibodies, a microscopic analysis of the spatial distribution of 5-HT7-immunoreactivity(-IR) was revealed in worm tissue. In metacercariae of O. felineus 5-HT7-IR was observed in the main nerve cords and in the head commissure connecting the head ganglia. The presence of 5-HT7-IR was also found in several structures located on the oral sucker. 5-HT7-IR was evident in the round glandular cells scattered throughout the larva body. In cysticercoids of H. diminuta immunostaining to 5-НТ7 was found in flame cells of the excretory system. Weak staining to 5-HT7 was observed along the longitudinal and transverse muscle fibres comprising the body wall and musculature of suckers, in thin longitudinal nerve cords and a connective commissure of the central nervous system. Available publications on serotonin action in flatworms and serotonin receptors identification were reviewed. Own results and the published data indicate that the muscular structures of flatworms are deeply supplied by 5-HT7-IR elements. It suggests that the 5-HT7 type receptor can mediate the serotonin action in the investigated species and is an important component of the flatworm motor control system. The study of the neurochemical basis of parasitic flatworms can play an important role in the solution of fundamental problems in early development of the nervous system and the evolution of neuronal signalling components.

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“…One such study involving a species of Allopodocotyle (Digenea : Opecoelidae), showed a correlation between location of major transverse commissures and nerve cords with various types of sensory structures located in cercaria by cholinesterase and silver nitrate staining (Bogea & Caira, 2001). They represent the external termini of the intricate sensory systems used by larval trematodes to orient themselves in the pursuit of a suitable intermediate host.…”

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: 99%

“…Ultrastructural investigations carried out in conjunction with studies of receptor position relative to neuronal networks draw a connection between sensory perception and the locomotive behaviour involved in host finding. One such study involving a species of Allopodocotyle (Digenea : Opecoelidae), showed a correlation between location of major transverse commissures and nerve cords with various types of sensory structures located in cercaria by cholinesterase and silver nitrate staining (Bogea & Caira, 2001). The topics of trematode nervous communication are covered in detail in review articles in this supplement.…”

Section: O T I L I T Y a N D H O S T-f I N D I N G B E H A V I O U Rmentioning

confidence: 99%

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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Ultrastructure and chaetotaxy of sensory eeceptors in the cercaria of a species of Allopodocotyle Pritchard, 1966 (Digenea: Opecoelidae)

Cited by 14 publications

References 18 publications

New data on the nervous system ofCercaria parvicaudataStunkard & Shaw, 1931 (Trematoda: Renicolidae): revisiting old hypotheses

New data on the nervous system ofCercaria parvicaudataStunkard & Shaw, 1931 (Trematoda: Renicolidae): revisiting old hypotheses

Serotonin Signalling in Flatworms: An Immunocytochemical Localisation of 5-HT7 Type of Serotonin Receptors in Opisthorchis felineus and Hymenolepis diminuta

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

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