Composante Aminoacide Des Tissus, Chez Les Crustacés. I. — Composante Amino-Acide Des Muscles De<i>Carcinus Maenas</i>L. Loks Du Passage De L'eau De Mer a L'eau Saumatre Et Au Cours De La Mue

Duchateau, G; Florkin, Marcel; Jeuniaux, Charles

doi:10.3109/13813455909072304

Cited by 61 publications

(5 citation statements)

References 4 publications

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“…Intracellular isosmotic regulation, considered the primitive mechanism of regulation, is based mainly on the control of the intracellular concentration of small organic molecules in order to maintain the osmotic equilibrium between the cells and the hemolymph. It has been demonstrated that free amino acids play a major function in intracellular isosmotic regulation in crustaceans (Duchâteau et al 1959;Duchâteau-Bosson and Florkin 1961;Jeuniaux et al 1961;Bricteux-Grégoire et al 1962;Florkin 1962;Florkin et al 1964;Schoffeniels 1970;Gérard and Gilles 1972). This intracellular mechanism alone generally confers a low or moderate tolerance to salinity changes in species devoid of extracellular osmotic regulation (called osmoconformers).…”

Section: Introductionmentioning

confidence: 97%

Ontogeny of Intracellular Isosmotic Regulation in the European LobsterHomarus gammarus(L.)

Haond¹,

Bonnal²,

Sandeaux³

et al. 1999

Physiological and Biochemical Zoology

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Intracellular free amino acids were measured in the abdominal muscle of the three larval instars, postlarvae, and juveniles of the lobster Homarus gammarus, acclimated to seawater (35 per thousand) and to a dilute medium (22 per thousand), to study intracellular isosmotic regulation throughout the development of this species. Transfer to low salinity was followed by a highly significant drop of free amino acids level in all developmental stages. The main regulated amino acids were glycine, proline, and alanine. The level of regulation of total free amino acids changed at metamorphosis: the decrease in total free amino acids at low salinity was 46% in the three larval instars, but it was only 29% in postlarvae and 20% in juveniles. These results suggest that free amino acids, mainly glycine, proline, and alanine, are involved in intracellular isosmotic regulation in the lobster, with different levels of involvement in pre- and postmetamorphic stages. The ontogenetic changes in intracellular isosmotic regulation are discussed in relation to the changes in extracellular regulation (osmoregulation) in the lobster.

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Section: Introductionmentioning

confidence: 97%

Ontogeny of Intracellular Isosmotic Regulation in the European LobsterHomarus gammarus(L.)

Haond¹,

Bonnal²,

Sandeaux³

et al. 1999

Physiological and Biochemical Zoology

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“…Since then a large number of studies have appeared concerning the cellular adaptation of different species to osmotic stress. Duchateau et al (2) were the first to show that loss or gain of free tissue amino acids played a prominent role in the adaptation of invertebrates to extremes of environmental salinities. The role of amino acids and related compounds in adaptation to salinity change has since been extended to bacteria (3), plants (4, 5), amphibians (6), and mammals (7-1 1).…”

Section: (Pediatr Res 26:482-485 1989)mentioning

confidence: 99%

myo-Inositol: A Newly Identified Nonnitrogenous Osmoregulatory Molecule in Mammalian Brain

et al. 1989

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ABSTRACT. Sugar alcohols have been found to play an important osmoregulatory role both in unicellular organisms and, more recently, in multicellular organisms, including mammals. This study shows that myo-inositol accumulates in the brains of chronically hypernatremic mice, as had been earlier found in rats, and demonstrates for the first time a profound decrease of myo-inositol in the brains of chronically hyponatremic mice. Together with decreases in better known cerebral osmoles (amino acids and related nitrogenous compounds), the decrease in myo-inositol apparently allows the brain to balance its intracellular osmolality with that of the plasma, permitting a normal brain water content (no edema) despite profound hyponatremia. (Pediatr Res 26:482-485, 1989)Cellular adaptation to osmotic stress is a vital biologic process that protects organisms from the possibly lethal effects of dehydration and shrinkage, or edema and swelling of cells. In 1955McDowell et al. (1) described the generation of unidentified ("idiogenic") osmotically active particles other than electrolytes in mammalian tissues in response to treatment with hyperosmolar solutions. Since then a large number of studies have appeared concerning the cellular adaptation of different species to osmotic stress. Duchateau et al. (2) were the first to show that loss or gain of free tissue amino acids played a prominent role in the adaptation of invertebrates to extremes of environmental salinities. The role of amino acids and related compounds in adaptation to salinity change has since been extended to bacteria (3), plants (4, 5), amphibians (6), and mammals (7-1 1). Not all amino acids contribute equally to cellular osmoregulation. For example, on a molar basis the greatest concentration change during salinity stress was in alanine in bivalve molluscs (12), glycine in lobsters (13), glutamate in toad (14), and taurine in mouse brain (9, 10). Also, not all osmoregulators are of nitrogenous origin. In osmophilic yeasts the predominant osmoregulatory molecule is arabitol (15), in green algae, it is glycerol (16). Recently a significant role of sugar alcohols in osmoregulation in higher species has been recognized. Pinitol and myo-inositol have been found to accumulate in drought-adapted varieties of maritime pine during water stress (1 7). Bagnasco et al. (19) that myo-inositol levels are increased in the brains of chronically hypernatremic rats. This was the first report citing an increase in inositol levels in brain and raises the important question of whether that change is reflected in the inositolcontaining lipids and in their function.We have earlier reported on the effects of chronic hyper-and hyponatremia and the effect that rapid restoration of plasma Na' levels to normal has on brain water, electrolyte, carbohydrate, energy and amino acid metabolism in young mice (10, 11). It was thus of interest to confirm the findings of Lohr et al. (19) in the chronic hypernatremic state and to examine the effect of chronic hyponatremia, and rapid correction, o...

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“…[1][2][3] Since then many researchers have studied the changes in concentration of FAA in these animals during osmotic stress with special reference to intracellular osmoregulation. [4][5][6][7][8][9] Those studies demonstrated that the patterns of FAA distribution varied from species to species, indicating genetic differences in key enzymes involved in amino acid metabolism.…”

mentioning

confidence: 99%

The Role of Free Amino Acids and Betaines in Intracellular Osmoregulation of Marine Sponges.

Shinagawa¹,

Suzuki²,

Kônosu³

1992

NIPPON SUISAN GAKKAISHI

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Composante Aminoacide Des Tissus, Chez Les Crustacés. I. — Composante Amino-Acide Des Muscles DeCarcinus MaenasL. Loks Du Passage De L'eau De Mer a L'eau Saumatre Et Au Cours De La Mue

Cited by 61 publications

References 4 publications

Ontogeny of Intracellular Isosmotic Regulation in the European LobsterHomarus gammarus(L.)

Ontogeny of Intracellular Isosmotic Regulation in the European LobsterHomarus gammarus(L.)

myo-Inositol: A Newly Identified Nonnitrogenous Osmoregulatory Molecule in Mammalian Brain

The Role of Free Amino Acids and Betaines in Intracellular Osmoregulation of Marine Sponges.

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