The Physiology and Biochemistry of Cestodes

Smyth, J. D.; McManus, Donald P.

doi:10.1017/cbo9780511525841

Cited by 222 publications

(257 citation statements)

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“…In many places, the plasmalemma between the microtriches and that of the epithelial cells of the host intestine are lacking, so that the matrix of the tegument is in direct contact with the cytoplasm of the host cells. Lysozomes have been demonstrated surrounding the microtriches embedded in the host cytoplasm (Smyth and McManus 1989).…”

Section: Pathological Changes Caused By Attachment Of B Acheilognathimentioning

confidence: 99%

RETRACTED ARTICLE: Occurrence, spread and control measures of Bothriocephalus acheilognathi (Bothriocephalidae: Cestoda)

2014

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Section: Pathological Changes Caused By Attachment Of B Acheilognathimentioning

confidence: 99%

RETRACTED ARTICLE: Occurrence, spread and control measures of Bothriocephalus acheilognathi (Bothriocephalidae: Cestoda)

2014

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“…It has also been proven that since the cestodes lack an alimentary canal, the microthrix layer serves in the uptake of nutrients and thus has absorptive function (Smyth and McManus 1989). Any disruption of the tegumental architecture is likely to have serious consequences on the worm.…”

Section: Introductionmentioning

confidence: 99%

Antiparasitic activity of methanolic extract of Acacia oxyphylla (Leguminosae) against Raillietina echinobothrida

Dasgupta

Roy

2010

J Parasit Dis

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Acacia oxyphylla has been used traditionally by the natives of Mizoram against intestinal worm infections. In the present study, the crude methanolic extract of the plant was tested in vitro on the cestode parasite Raillietina echinobothrida to evaluate its potential anthelmintic efficacy. The test parasites were exposed to varying concentrations of the plant extract in phosphate buffered saline and they all slipped into a flaccid paralytic state at varying periods of time post incubation. Ultrastructural observations on the paralysed worms revealed wide scale destruction of the parasite tegument with intense vacuolization of the syncytium and swellings of the basal lamina accompanied by deformities in the cell organelles. To determine the exact mode of action of the botanicals on the parasite body surface, the tegumental enzymes viz. acid phosphatase (AcPase), alkaline phosphatase (AlkPase) and adenosine triphosphatase (ATPase) were investigated. A prominent decrease in the phosphatase activity, in comparison to the untreated control parasites was noticeable. In view of the alterations in the structural and functional integrity of the tegument, occurring in the treated parasites, it may be assumed that the changes transpire because of a compromise in the permeability of the tegument under the influence of the test plant-derived active chemical principles.

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“…They are generally considered as important energy reserves, although this may not be the case in cestodes (Smyth and McManus 1989). Concerning the function of large lipid deposits, two theories prevail (1) an energy source, or (2) waste product of metabolism.…”

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confidence: 99%

Ultrastructural and cytochemical studies on vitellogenesis in the trypanorhynch cestode Parachristianella trygonis Dollfus, 1946 (Eutetrarhynchidae)

Świderski¹,

Miquel

Neifar

et al. 2007

Acta Parasitologica

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During vitellogenesis in Parachristianella trygonis (Trypanorhyncha, Eutetrarhynchidae) we distinguished four stages: (1) gonial or stem cell stage; (2) early differentiation stage concentrated on protein synthetic activity and shell-globule formation; (3) advanced differentiation stage with main cell activity concentrated on carbohydrate synthesis (glycogenesis) and massive glycogen storage in the form of α-glycogen rosettes and β-glycogen particles; and finally (4) mature vitellocyte stage. Early vitellocyte maturation is characterised by: (1) an increase in cell volume; (2) extensive development of large, parallel cisternae of GER that produce proteinaceous granules; (3) development of Golgi complexes engaged in packaging this material; (4) continuous enlargement of proteinaceous granules within vacuoles and their transformation into shell-globule clusters composed of heterogeneous material. Cytochemical staining with periodic acid-thiosemicarbazide-silver proteinate for polysaccharides indicated a strongly positive reaction for the presence of α-glycogen rosettes and β-glycogen particles in the advanced stage of vitellocyte maturation. Both protein synthesis for shell-globule formation and carbohydrate synthesis or glycogenesis, important storage of nutritive reserves for the developing embryos, observed during cytodifferentiation of P. trygonis vitellocytes overlap in time to some extent. Mature vitelline cells are very rich in three types of cell inclusions accumulated in large amounts in their cytoplasm: (1) shell-globule clusters, playing an important role in egg-shell formation; (2) numerous large lipid droplets, as well as a high accumulation of lipid and α-glycogen rosettes and β-glycogen particles that undoubtedly represent important nutritive reserves for the developing embryos. Despite the fact that the type of vitellogenesis and ultrastructure of the mature vitellocyte in P. trygonis appears to differ to some extent from those of three other trypanorhynch species, its general pattern and ultrastructure greatly resembles those observed in other lower cestodes. Factors that may have contributed to the qualitative and quantitative variation in lipids during vitellogenesis among the four species of Trypanorhyncha, are identified and discussed.

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The Physiology and Biochemistry of Cestodes

Cited by 222 publications

References 0 publications

RETRACTED ARTICLE: Occurrence, spread and control measures of Bothriocephalus acheilognathi (Bothriocephalidae: Cestoda)

RETRACTED ARTICLE: Occurrence, spread and control measures of Bothriocephalus acheilognathi (Bothriocephalidae: Cestoda)

Antiparasitic activity of methanolic extract of Acacia oxyphylla (Leguminosae) against Raillietina echinobothrida

Ultrastructural and cytochemical studies on vitellogenesis in the trypanorhynch cestode Parachristianella trygonis Dollfus, 1946 (Eutetrarhynchidae)

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