Origin, structure and function of subcuticular cells ofFasciola hepatica

Poljakova-Krusteva, O.; Donchev, N; Gorchilova, L.; Krustev, L

doi:10.1007/bf02462973

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…Acid phosphatase activity is also demonstrable within membranous vesicles in the syncytial epithelium of several tapeworms [3,20], and such data, although not conclusive, suggest the presence of lysosomes. This assumption is supported by the presence of latent cathepsin B (or B-like) activity in H .…”

Section: Discussionmentioning

confidence: 98%

Acid phosphatase activity in the isolated brush border membrane of the tapeworm, Hymenolepis diminuta: Partial, characterization and differentiation from the alkaline phosphatase activity

Pappas

1988

J of Cellular Biochemistry

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The isolated brush border membrane of the tapeworm, Hymenolepis diminuta, hydrolyzes p-nitrophenyl phosphate over a broad pH range. Acid phosphatase activity (pH optimum at 4.0) is inhibited specifically by sodium dodecyl sulfate (SDS) and NaF, while the alkaline phosphatase activity (pH optimum at 8.8) is inhibited specifically by levamisole, 2-mercaptoethanol, and ethylenediaminetetra-acetate (EDTA). These two phosphatase activities are further differentiated in that (1) there is a rapid decrease in alkaline phosphatase activity when the membrane preparation is incubated at pH 4.0, while there is little loss of acid phosphatase activity, and (2) the alkaline phosphatase activity is solubilized with no loss of activity when the membrane is treated with Triton X-100, while such treatment causes a significant loss of acid phosphatase activity. Both activities are nonspecific and hydrolyze a variety of phosphorylated compounds, but the relative activities of the two phosphatases against these substrates vary significantly.

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Section: Discussionmentioning

confidence: 98%

Acid phosphatase activity in the isolated brush border membrane of the tapeworm, Hymenolepis diminuta: Partial, characterization and differentiation from the alkaline phosphatase activity

Pappas

1988

J of Cellular Biochemistry

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The development of the ventral papillae ofNotocotylus triserialis (Digenea: Notocotylidae)

MacKinnon

1982

Z. Parasitenkd.

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The development of the ventral papillae of Notocotylus triserialis was studied by light and electron microscopy. The median row papillae first appeared on 2-day-old worms and the lateral rows on 4-day-old worms. The papillae grew in size and in number and size of constituent cells, with rapid development occurring between days 5 and 8. This rapid growth corresponded with the time of onset of egg production by the worm. Electron microscopy indicated that the papillae of 3- and 4-day-old worms contained numerous undifferentiated cells with little cytoplasm and extensive Golgi bodies. By days 5 and 6 most of these cells contained developing mitochondria; only a few undifferentiated cells were visible. Muscles and nervous tissue also became more prominent at this time. The ultrastructure of the papillae of 7- and 8-day-old worms was similar to that of papillae from adult worms. After day 9 or 10, the size and number of cells per papilla remained constant until the death of the worm.

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The development of the tegument and cercomer of the polycephalic larvae (cercoscolices) ofParicterotaenia paradoxa(Rudolphi, 1802) (Cestoda: Dilepididae) at the ultrastructural level

MacKinnon

Burt

1984

Parasitology

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SUMMARYThe development of the tegument and cercomer ofParicterotaenia paradoxapolycephalic larvae was examined using electron microscopy. Larvae are formed by budding from the inner surface of the tegument of the degenerating hexacanth embryo. A new secondary tegument formed around the larvae is probably produced from the original hexacanth sub-tegumental cells. Microvilli covering the surface of young larvae are converted directly into microtriches, as the larvae develop, by addition of electron-dense material to the proximal part of the microvillus. Remnants of the original microvillus are visible at the distal surface of each new microthrix, but they eventually degenerate. The cercomer homologue is represented by scattered follicular cells, bearing microvilli, lying just within the containing cyst wall. The continuity of tegumentary tissue from one developmental stage to the next is discussed.

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Origin, structure and function of subcuticular cells ofFasciola hepatica

Cited by 3 publications

References 7 publications

Acid phosphatase activity in the isolated brush border membrane of the tapeworm, Hymenolepis diminuta: Partial, characterization and differentiation from the alkaline phosphatase activity

Acid phosphatase activity in the isolated brush border membrane of the tapeworm, Hymenolepis diminuta: Partial, characterization and differentiation from the alkaline phosphatase activity

The development of the ventral papillae ofNotocotylus triserialis (Digenea: Notocotylidae)

The development of the tegument and cercomer of the polycephalic larvae (cercoscolices) ofParicterotaenia paradoxa(Rudolphi, 1802) (Cestoda: Dilepididae) at the ultrastructural level

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