Permeation and Membrane Transport in Animal Parasites: Further Observations on the Uptake of Glucose by Hymenolepis diminuta

Phifer, Kenneth

doi:10.2307/3275158

Cited by 40 publications

(3 citation statements)

References 13 publications

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“…The latter, however, do not necessarily correspond to biochemical estimations. In Hymenolepis diminuta Phifer (1960) demonstrated that the distribution of alkaline phosphatase in a hymenolepid worm (H. nana) is similar to that found in Moniezia.…”

Section: Discussionsupporting

confidence: 62%

Histochemical observations on the tegumentary epithelium and interproglottidal glands of Moniezia expansa (Rud., 1805) (Cestoda, Cyclophyllidea)

Re¹,

Erasmus²

1969

Parasitology

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Regional differences in the tegumentary tissue of Moniezia expansa, as revealed at the light-microscope level by histological and histochemical techniques, are described and evidence for secretory activity by the interproglottidal glands is presented.In very immature proglottides the interproglottidal glands are at the ‘precryptic’ stage. Gland cells may be differentiated from other tegumentary cells by their high RNA content and in certain gland cells the presence of an alcian blue staining material.In mature proglottides the glands consist of rosette-like clusters of cells around crypt-like intuckings of the tegument. Two types of cells are found in the gland, small alcian blue-staining cells which are most numerous in the neck region of the crypt, and larger cells, the predominant gland cells, which do not stain with alcian blue but possess non-specific esterase activity. No other tegumentary cells in Moniezia exhibit this activity. Esterase and phosphatase activity is found in the tegument and crypt of the glands and in the interproglottidal folds.The non-enzyme histochemistry confirms and extends the observations of previous workers.Cytochrome oxidase and succinic dehydrogenase were detected in the tegumentary cells and tegument. Very strong reactions were given in the neck and scolex, with a progressive diminution of activity posteriorly along the strobila. Very low activities were recorded in the tegument of the glands.

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Section: Discussionsupporting

confidence: 62%

Histochemical observations on the tegumentary epithelium and interproglottidal glands of Moniezia expansa (Rud., 1805) (Cestoda, Cyclophyllidea)

Re¹,

Erasmus²

1969

Parasitology

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“…Cestodes are physiologically most active at the neck, the region of development of new segments where maximum transportation occurs (PHIFER, 1960). This is facilitated by ascorbic acid regulating phosphatases, the main enzymes for absorption of nutrients.…”

Section: Resultsmentioning

confidence: 99%

Ascorbic acid levels in the proglottides of four species of cestode parasites of mammals and birds in relation to their sexual maturity

Tandon

Gupta

1988

J. Helminthol.

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“…This was emphasized by Read et al (1963) in comparing the recovery of radioactivity and chemically identifiable methionine in Hymenolepis. This has also been examined in the case of radioactive sugar uptake in Hymenolepis (Phifer, 1960) and Fasciola hepatica , the uptake of water-soluble vitamins by Hymenolepis (Pappas & Read, 1972a, b) and the uptake of radiolysine by S. mansoni (M. Ruff, personal communication). It is clearly necessary to evaluate the extent of degradation and incorporation of radioactive compounds when these are used in studying absorption.…”

Section: Discussionmentioning

confidence: 99%

Permeability and membrane transport in the larva ofTaenia crassiceps

Pappas

Read

1973

Parasitology

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The free pool amino acids of Taenia crassiceps metacestodes (advanced larvae) were analyzed quantitatively. In addition, the uptake of L-glutamic acid, L-proline, L-phenylalanine, L-lysine, and L-methionine was studied. Proline and glutamic acid absorption followed straight-line kinetics with respect to substrate concentration, and were not inhibited by their own molecular species. Lysine, phenylalanine and methionine were found to enter larvae by a combination of diffusion and mediated processes. Lysine absorption was inhibited only by lysine, arginine and ornithine. Phenylalanine and methionine uptake was not inhibited by lysine or arginine, but was inhibited by several other amino acids. The data suggested the presence of a basic amino acid transport locus and two distinct transport loci for methionine absorption. In addition, both immature and advanced larvae were found to be impermeable to [14C]inulin (M.W. ca. 5000). These results are discussed and compared with the results of earlier investigations of protein and amino acid absorption by T. crassiceps larvae.

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Permeation and Membrane Transport in Animal Parasites: Further Observations on the Uptake of Glucose by Hymenolepis diminuta

Cited by 40 publications

References 13 publications

Histochemical observations on the tegumentary epithelium and interproglottidal glands of Moniezia expansa (Rud., 1805) (Cestoda, Cyclophyllidea)

Histochemical observations on the tegumentary epithelium and interproglottidal glands of Moniezia expansa (Rud., 1805) (Cestoda, Cyclophyllidea)

Ascorbic acid levels in the proglottides of four species of cestode parasites of mammals and birds in relation to their sexual maturity

Permeability and membrane transport in the larva ofTaenia crassiceps

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