Surface Ultrastructure of the Tegument of Clonorchis sinensis Newly Excysted Juveniles and Adult Worms

Fujino, Takahiro; Ishii, Y.; Cho, DW

doi:10.2307/3280325

Cited by 73 publications

(44 citation statements)

References 16 publications

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“…Dense formations were observed earlier in nonciliate receptors of the digeneans Clonorchis sinensis by Fujino et al (1979) and Gorgoderina vitelliloba by Hoole and Mitchell (1981). Electron-dense formations (of different shape and dimensions) have been observed in other platyhelminths in ciliate and non-ciliate sensory receptors.…”

Section: Discussionmentioning

confidence: 78%

“…In the forebody papillae of this digenean, only ciliate sensory receptors were detected. Non-ciliate intra-papillar receptors reported for other digeneans (Bennett 1975a, Fujino et al 1979, Hoole and Mitchell 1981, Dunn et al 1987, Žďárská 1993 were not present.…”

Section: Discussionmentioning

confidence: 89%

“…by Bennett 1975b, Sakamoto and Ishii 1977, Bakke 1978, Font and Wittrock 1980, Crites and Jilek 1981, Žďárská et al 1983, 1988, Žďárská and Soboleva 1990. With TEM, the structure of the papillae of adult digeneans was studied by Bennett (1975a) in Fasciola hepatica Linnaeus, 1758; Edwards et al (1977) in Philophthalmus megalurus (Cort, 1914);Fujino et al (1979) in Clonorchis sinensis (Cobbold, 1875); Hoole and Mitchell (1981) in Gorgoderina vitelliloba (Olson, 1876);Dunn et al (1987) in three species of paramphistomes, and Žďárská (1993) in Brachylaimus aequans (Looss, 1899).…”

mentioning

confidence: 99%

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Transmission electron microscopy of presumed sensory receptors in the forebody papillae of Crepidostomum metoecus (Digenea: Allocreadiidae)

Zdárská

Nebesářová²

2004

FOLIA PARASIT

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Abstract. Five types of presumed ciliate sensory receptors were detected in the forebody papillae of the adult fish trematode, Crepidostomum metoecus (Braun, 1900). The cilia are short and submerged in a tegumental pit. The apical bulb part of all types of receptors observed is supported by a dense collar and connected to the tegument basal plasma membrane by a circular septate junction. In sensory receptors types I and III no rootlet is present; the bulbs of sensory receptors types III and IV contain an electron-dense formation.

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 89%

mentioning

confidence: 99%

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Transmission electron microscopy of presumed sensory receptors in the forebody papillae of Crepidostomum metoecus (Digenea: Allocreadiidae)

Zdárská

Nebesářová²

2004

FOLIA PARASIT

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“…not communicating with the exterior or communicating with it by a narrow pit only. Thus one type of receptor with no access to the exterior was observed in Fasciola hepatica by Bennett (1975) and in Clonorchis sinensis (Cobbold, 1875) by Fujino et al (1979) and four types in Brachylaimus aequans (Looss, 1899) by Žďárská et al (1990) and Žďárská (1993).…”

Section: Discussionmentioning

confidence: 99%

Transmission electron microscopy of intra-tegumental sensory receptors in the forebody of Crepidostomum metoecus (Digenea: Allocreadiidae)

Zdárská

Nebesářová²

2003

FOLIA PARASIT

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Abstract. In the adult fish trematode Crepidostomum metoecus (Braun, 1900), four types of sensory receptors were observed inside the forebody tegument and one type beneath the tegument basal lamina. Two types of sensory receptors extend through the thickness of tegument and have a free cilium inside a pit (types I and II). Two types (III and IV) are nonciliate and entirely intrategumental in location. Type IV receptor with large horizontal and thin vertical rootlets was described earlier in aspidogastreans only. Below the basal lamina, nerve endings in close association with muscle fibres, comparable with those in the Aspidogastrea, were detected.

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“…The first and outermost region of the tegument contains highly folded parts, namely, ridges and pits. The membrane covering these structures is trilaminate and coated with a substantial layer of glycocalyx, a typical feature found in all bile and lumen-dwelling trematodes, including, F. hepatica [20][21][22] Clonorchis sinensis 23 and Oposthorchis viverini. 24 The vast amount of membrane covering the ridges and pits helps to increase the surface area for absorption and exchanging of materials.…”

Section: The First Layermentioning

confidence: 99%

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Sobhon¹,

Dangprasert²,

Chuanchaiyakul³

et al. 2000

ScienceAsia

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The tegument of adult Fasciola gigantica can be divided into four layers based on ultrastructural characteristics. The first layer includes ridges and pits which are covered by a trilaminate membrane about 8 nm thick, underlined by a dense lamina about 15 nm thick. The membrane is coated externally by the glycocalyx which consists of two layers: the inner dense homogeneous layer about 10-15 nm, and the outer fibrillar layer about 100-300 nm thick which is intensely stained with ruthenium red. The cytoplasm is composed of densely-packed microtrabecular network, and contains many ovoid granules (G 1 ) whose size is about 90 x 180 nm, and numerous discoid granules (G 2 ) whose size is about 40 x 250 nm. G 1 contain dense ruthenium red-positive matrix while G 2 contain translucent matrix, and both are surrounded by a trilaminate membrane. G 1 close to the surface invariably exocytose their content into bottoms of the pits, while some G 2 are fused and have their membrane joined up with the surface membrane. It is, therefore, suggested that G 1 contribute to the formation of glycocalyx while G 2 are the main contributor to the surface membrane. The second layer of the tegument is a narrow zone of cytoplasm that contains high concentrations of G 1 , G 2 granules and lysosomes. The third layer is the widest middle portion of the tegument which contains numerous and evenly distributed mitochondria. Both G 1 and G 2 granules are present but in much fewer number than in the first and second layers. The fourth layer is the innermost zone that rests on and couples with the 120-140 nm thick basal lamina. Its cytoplasm is loosely packed and contains numerous infoldings of the basal plasma membrane which have mitochondria in close association. It contains fairly large numbers of G 1 and G 2 granules which are produced and transported to the tegument by one type of tegumental cells lying in rows underneath the muscular layers. Spines in the tegument are numerous, each is a wedge-shaped crystalline structure with the lattice spacing about 4 nm, and its rootlets are firmly implanted in the basal lamina.

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Surface Ultrastructure of the Tegument of Clonorchis sinensis Newly Excysted Juveniles and Adult Worms

Cited by 73 publications

References 16 publications

Transmission electron microscopy of presumed sensory receptors in the forebody papillae of Crepidostomum metoecus (Digenea: Allocreadiidae)

Transmission electron microscopy of presumed sensory receptors in the forebody papillae of Crepidostomum metoecus (Digenea: Allocreadiidae)

Transmission electron microscopy of intra-tegumental sensory receptors in the forebody of Crepidostomum metoecus (Digenea: Allocreadiidae)

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