Calcium and phosphorus in the skeleton and blood of the lungfish Lepidosiren paradoxa, with comment on humoral factors in calcium homeostasis in the osteichthyes

Urist, Marshall R.; Uyeno, Shinji; King, E.L.; Okada, Munemasa; Applegate, S. P.

doi:10.1016/0300-9629(72)90119-3

Cited by 41 publications

(12 citation statements)

References 18 publications

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“…A remarkably high plasma protein content was found in Myxine glutinosa L. It is interesting that in Lampetrafluviatilis, representing another group of cyclostomes, the plasma has a protein content of the same magnitude as Mynine (Robertson, 1954;Urist et al, 1972). The latter authors also reported that albumin in Lampetra represented about one-fourth of the total protein level.…”

Section: Total Plasma Proteinmentioning

confidence: 87%

Comparative study of some haematological and biochemical blood parameters in fishes from the Skagerrak

Larsson

Johansson‐Sjöbeck

Fänge

1976

Journal of Fish Biology

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Marine fishes caught in the Skagerrak, 27 different species representing various groups of fishes (Cyclostomi, Holocephali, Elasmobranchii and Teleostei), were examined for the following haematological and biochemical blood parameters : haematocrit, haemoglobin, mean corpuscle haemoglobin concentration, total plasma protein, blood glucose and blood lactate. Interspecies variations as well as variations within some species were observed. The haemoglobin values for all species showed a positive correlation to the corresponding haematocrit values. Relatively low values for haematocrit and haemoglobin were found in cyclostomes, holocephaleans and elasmobranchii compared to the majority of teleosts. Within the teleost group, the haematocrit and haemoglobin levels were positively correlated with the activity of the fish species. The cyclostome Myxine glutinosu L. had a total plasma protein content in the same range as most teleosts, whereas holocephaleans, elasmobranchii and the deep-water teleost Coryphuaaoides rupestris Gunnerus showed comparatively low values. Among teleosts some relationship seemed to exist between the total plasma protein level and the activity of the fish species. In addition, a correlation between plasma protein content and levels of blood lipids were noted. Values for blood glucose and blood lactate were found to be lower in cyclostomes, holocephaleans and elasmobranchii than in most teleosts. Higher blood glucose levels were observed in the more active teleost species.

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Section: Total Plasma Proteinmentioning

confidence: 87%

Comparative study of some haematological and biochemical blood parameters in fishes from the Skagerrak

Larsson

Johansson‐Sjöbeck

Fänge

1976

Journal of Fish Biology

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“…The internal milieu of free-swimming Dipnoans resembles that of freshwater fishes with plasma osmolarity of 240 mOsm/l (Urist et al 1972). Freshwater lungfishes are therefore hyperosmoregulators.…”

Section: Introductionmentioning

confidence: 99%

Mitochondria-rich cells in gills and skin of an African lungfish, Protopterus annectens

Sturla

Masini

Prato

et al. 2001

Cell and Tissue Research

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We used scanning electron microscopy, the vital dye DASPEI and an antibody to the inner mitochondrial membrane to study the presence and localisation of mitochondria-rich cells in the gills and skin (opercular, dorsal and ventral) of the lungfish Protopterus annectens in its free-swimming conditions and at the beginning of aestivation. In the free-swimming period, the gills were short and thick and the pavement cells were extremely large (30-40 microns). The mitochondria-rich cells, which were distributed in the secondary and primary epithelium, occurred as two morphologically different types, i.e. elongated and oval, similar to the alpha and beta chloride cells of fresh water teleosts. In the skin, only one type of mitochondria-rich cells was found, resembling the alpha chloride cells. All the mitochondria-rich cells distributed in the gills and skin were labelled with anti Ca(2+)-ATPase serum indicating the possible uptake of Ca2+ at freshwater chloride cell level. At the start of aestivation, the skin and gills were covered by a thick layer of mucus and the epithelium of the gills was reduced. The mitochondria-rich cells were almost completely covered by the pavement cells.

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“…The present data (Table II) augments present understanding of terrestrialization physiology, showing that plasma Ca and Mg concentrations are also maintained, and that Na, Cl and Ca concentrations in most tissues are well regulated despite substantial increases in tissue water content associated with urea retention. With respect to exceptions, the increases in Ca concentrations in liver and kidney suggest that some re‐organization of internal Ca distribution occurs during terrestrialization; calcium metabolism in lungfishes is rather different from other fishes as noted earlier (Urist et al ., 1972). The apparent loss of Cl from the kidney could be the result of diversion of blood flow away from a non‐working kidney.…”

Section: Discussionmentioning

confidence: 92%

“…Regulation of such low extracellular ion levels minimizes the ionic gradients that must be maintained against the environment by active transport, and therefore may be a metabolically favourable trait in a taxonomic group that is characterized by extraordinarily low metabolic rates (Iftikar et al ., 2008). Urist et al . (1972) postulated that this characteristic of low plasma ion concentrations reflected the much longer evolutionary history of the Dipnoi in fresh water in contrast to more modern fishes such as the teleosts.…”

Section: Discussionmentioning

confidence: 99%

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Ionoregulatory physiology of two species of African lungfishes Protopterus dolloi and Protopterus annectens

Patel

Iftikar

Leonard

et al. 2009

Journal of Fish Biology

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Basic ionoregulatory physiology was characterized in two species of African lungfish, slender African lungfish Protopterus dolloi and West African lungfish Protopterus annectens, largely under aquatic conditions. There were no substantive differences between the two species. Plasma [Na], [Cl] and [Ca] were only 60-80% of those typical of freshwater teleosts, and plasma Ca activity was particularly low. Unidirectional Na and Cl influx rates from water were also very low, only c. 10% of teleost values, whereas unidirectional Ca influx rates were comparable with teleost rates. Protopterus spp. were fed a 3% ration of bloodworms every 48 h. The bloodworm diet provided similar amounts of Na and Ca as uptake from water, but almost no Cl. Efflux rates of Na and Cl through the urine were greater than via the faeces, whereas the opposite was true for Ca. Net ion flux measurements and ionic balance sheet calculations indicated that (1) both water and dietary uptake routes are important for Na and Ca acquisition; (2) the waterborne route predominates for Cl uptake; (3) unidirectional ion effluxes across the body surface (gills and skin) rather than urine and faeces are the major routes of loss for Na, Cl and Ca. Tissues (muscle, liver, lung, kidney, intestine and heart) and plasma ions were also examined in P. dolloi'terrestrialized' in air for up to 5 months, during which plasma ion concentrations (Na, Cl, Ca and Mg) did not change and there were only a few alterations in tissue ions, that is, increased [Na] in intestine, decreased [Cl] in kidney and increased [Ca] in liver and kidney.

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Calcium and phosphorus in the skeleton and blood of the lungfish Lepidosiren paradoxa, with comment on humoral factors in calcium homeostasis in the osteichthyes

Cited by 41 publications

References 18 publications

Comparative study of some haematological and biochemical blood parameters in fishes from the Skagerrak

Comparative study of some haematological and biochemical blood parameters in fishes from the Skagerrak

Mitochondria-rich cells in gills and skin of an African lungfish, Protopterus annectens

Ionoregulatory physiology of two species of African lungfishes Protopterus dolloi and Protopterus annectens

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