Short period rhythms of liver glycogen content

Mizell, Sherwin; Moskow, Herbert; Warren, Sally

doi:10.1016/0300-9629(71)90080-6

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…That the liver assists respiration by supplying glucose for anaerobic glycolysis, even if limited to cases of protracted hypoxia, justifies the abundant reserve of hepatic glycogen described in amphibians which, in comparison to other vertebrates, accumulate incredible quantities (up to 1.28 g per 100 g of body weight in Rana pipiens) which are subject to marked seasonal variations (Mizell et al, 1965). This type of liver intervention in amphibian respiration has been amply demonstrated by Rose, Zambernard & Pogany (1 965) in the urodele Amphiuma tridactylum, which is capable of surviving more than 6 h in a state of complete anoxia thanks to the mobilization of glucose by the hepatocytes.…”

Section: Discussionmentioning

confidence: 99%

The role of the liver in the cutaneous respiratory compensation of the frog (Rana esculenta)

Frangioni

Borgioli

1993

Journal of Zoology

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Experiments on anaesthetized specimens of Rana esculenta (L.) demonstrate that at low temperatures (6°C) the liver of the frog‐like the spleen of the newt‐regulates cutaneous respiration, storing red blood cells when the animal is well oxygenated and releasing these into circulation under conditions of hypoxia. During the shift from the congested to decongested state, the liver is reduced to about two‐thirds of its weight, while the erythrocyte concentration and correlated parameters in the bloodstream can increase by more than 50%. At higher temperatures (18°C) this compensatory mechanism becomes inefficient and the liver oversees the survival of the hypoxic organism for a fairly long period of time (about 5 hours) by releasing glucose for anaerobic glycolysis.

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Section: Discussionmentioning

confidence: 99%

The role of the liver in the cutaneous respiratory compensation of the frog (Rana esculenta)

Frangioni

Borgioli

1993

Journal of Zoology

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Unusual plasma acid phosphatase activity in two species of Tasmanian marsupials

Sallis¹,

Guiler²

1977

The Biology of Marsupials

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Studies on the liver of Xenopus laevis

Spornitz

1975

Anat Embryol

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The liver of Xenopus laevis was examined with electron microscopy. Its structure was found to be markedly different from that of mammals, particularly regarding the morphology of the hepatocytes to be classified as typical. It was established that the main function of such a cell is the storage of glycogen, and further that it possesses only scant organelles and other inclusions. Since this type of cell was found most frequently in the liver of untreated animals, it was designated as normal cell. The fact appears noteworthy that in the normal liver of Xenopus laevis an abundance of cell types occur which are otherwise found to be proliferated under experimental conditions, e.g. cells with pronouncedly augmented RER, enlarged Golgi complexes, increased lipid inclusions etc. This high number of divergent hepatocytes and the fact that all intermediate stages between the individual extremes are present and not to be accounted for by the position of the cell within the liver was interpreted as being the expression of a cyclic passage of the various stages of activity. It is of special interest that augmented degradation of glycogen in the liver cell takes place only during vitellogenesis. Acute and chronic hunger, as well as adaptation to cold, hardly affect the morphology of the normal cell, especially as far as the glycogen is concerned. The possible causes for this are discussed.

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Short period rhythms of liver glycogen content

Cited by 4 publications

References 9 publications

The role of the liver in the cutaneous respiratory compensation of the frog (Rana esculenta)

The role of the liver in the cutaneous respiratory compensation of the frog (Rana esculenta)

Unusual plasma acid phosphatase activity in two species of Tasmanian marsupials

Studies on the liver of Xenopus laevis

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