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Hepatic respiratory compensation and haematological changes in the cave cyprinid, Phreatichthys andruzzii (1997)

Frangioni, Giuliano ; Berti, Roberto ; Borgioli, Gianfranco

Springer

Journal of comparative physiology 167 (1997), S. 461-467

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ISSN: 1432-136X

Keywords: Key words Blood ; Cave fish ; Erythrocytes ; Liver ; Spleen

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Abstract In several ectotherms, including all members of the Osteichthyes studied so far, the spleen is capable of storing and releasing erythrocytes according to the animal's respiratory needs. The tropical cave cyprinid Phreatichthys andruzzii uses its liver rather than the spleen as the site of accumulation in the respiratory compensation process, like the amphibian Rana esculenta. The reversible process of erythrocyte accumulation in the liver is very evident in animals anaesthetized with chlorobutanol; MS-222, an anaesthetic widely used in lower vertebrates alters all the haematological parameters and is not suitable for studies on blood and respiration. The hepatic respiratory compensation mechanism is as efficient as the splenic one: in animals kept at 18 °C for 24 h the mean liver weight percentage was 70% higher than in specimens kept at 28 °C (2.43% of the body weight compared to 1.39%, in groups of six specimens) while mean red blood cell counts fell from 2.49 to 1.60 · 1012 per l, in agreement with the haematocrit value and haemoglobin concentration; mean corpuscular volume remained constant (at about 177 fl).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s003600050097

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Lactate sensitive cells in newt kidneys (1980)

Frangioni, Giuliano ; Borgioli, Gianfranco

Springer

Cell & tissue research 207 (1980), S. 233-239

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ISSN: 1432-0878

Keywords: Kidney ; Triturus cristatus carnifex ; Erythropoiesis ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary Specimens of Triturus cristatus carnifex (Laurenti), raised in 3.2 g/l solution of sodium lactate, presented hypertrophy of “lactate sensitive cells” (LSC) clustered at the vascular pole of each renal corpuscle. As seen under both the light and electron microscopes, these are specialized cells of the Bowman's capsule located at the junction between its visceral and parietal layers. The structure formed by the cells, heretofore unknown, is topographically associated with the juxtaglomerular apparatus. As lactate stimulates erythropoiesis even in normal oxygenated specimens and hypoxia induces hypertrophy of LSC in newts, it is hypothesized that the LSC are the site of erythropoietin (ESF) synthesis. A scheme of ESF biogenesis in newts, integrating the above principles, concludes the paper.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00237808

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