Characterization of gill Na/K-ATPase activity and ouabain binding in Antarctic and New Zealand nototheniid fishes

Guynn, S. R.; Dowd, Frank J.; Petzel, D. H.

doi:10.1016/s1095-6433(01)00488-3

Cited by 28 publications

(18 citation statements)

References 27 publications

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“…-ATPase activity levels measured following acclimation to a temperature of ?4°C, cold acclimation for this species. These findings (Guynn et al 2002) were thought to be consistent with earlier studies (Burton 1986b). The changes were reflected in plasma Na ?…”

Section: Afps In Other Tissuessupporting

confidence: 91%

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Environmental influences on regulation of blood plasma/serum components in teleost fishes: a review

Nordlie

2009

Rev Fish Biol Fisheries

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Concentrations of both inorganic and organic blood plasma/serum components of teleost fishes were reviewed in seven habitat/life-history categories. These were: freshwater; inland saline; estuarine and nearshore marine; pelagic and deepsea; diadromous; southern cold-water; and northern cold-water. Plasma/serum osmolalities were compared among groups acclimated to/living in fresh and in salt water. Contributions of inorganic ions and colligative and non-colligative organic molecules were evaluated including with respect to melting and freezing points, and ''antifreeze activity'' of plasma/serum in species from cold marine waters. Possible roles of TMAO in deep-water fishes were reviewed. Discussion also included influences of ambient salinity and temperature on concentrations of plasma/serum components. Seasonal cycles of blood plasma/serum components were discussed, along with antifreeze concentrations in other body fluids and tissues of cold-water fishes. Regulatory patterns of plasma/serum osmolalities were compared among the most euryhaline of teleosts evaluated here. Highest mean values of plasma/serum osmolalities in sea water were seen in southern cold-water and in pelagic and deep-sea fishes. The southern cold-water group also had the lowest plasma/serum freezing points among these groups. Comparisons of mean plasma/serum Na ? and Cl -concentrations among fishes from fresh waters did not differ significantly among groups, but species from cold marine waters showed higher levels than did other groups in marine waters. Plasma/serum osmotic, Na ? and Cl -concentrations of these seven groups of teleosts were compared with those of other fish-like vertebrate groups. Possible impacts of global warming on regulatory responses of plasma/serum components were discussed.

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Section: Afps In Other Tissuessupporting

confidence: 91%

“…, K ? -ATPase activity in the gills (Guynn et al 2002). However, individuals of N. angustata that had been acclimated to a temperature of ?14°C did not show a significant change in serum osmolality (&380 mOsm kg -1 ) or in gill Na ?…”

Section: Afps In Other Tissuesmentioning

confidence: 99%

Environmental influences on regulation of blood plasma/serum components in teleost fishes: a review

Nordlie

2009

Rev Fish Biol Fisheries

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“…Four to 6 weeks of warm‐acclimation results in plasma hypo‐osmoregulation in two benthic Antarctic nototheniids (Gonzalez‐Cabrera et al ., 1995; Guynn et al ., 2002), and a secondary objective of this study was to determine whether the more active P. borchgrevinki conformed to this trend.…”

Section: Introductionmentioning

confidence: 99%

Plasma osmolarity, glucose concentration and erythrocyte responses of two Antarctic nototheniid fishes to acute and chronic thermal change

Lowe

Davison

2005

Journal of Fish Biology

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Haematocrit, haemoglobin concentration, plasma osmolarity and plasma glucose concentration of the Antarctic nototheniid fishes Pagothenia borchgrevinki and Trematomus bernacchii were monitored during 24 h periods of exposure to 3 and 6 C. The same haematological variables were also measured in P. borchgrevinki following a 5-6 week period of 4 C acclimation. The first plasma glucose measurements in acutely thermally-stressed Antarctic nototheniids revealed a delayed hyperglycaemia which related well to the relatively slow stress-related elevation of plasma cortisol in these species. Plasma osmolarity of both species was unchanged by acute 3 C exposure, but exhibited a delayed and transient increase during acute exposure to 6 C. Haematocrit was unaltered in T. bernacchii during the acute temperature increases but was elevated in the relatively active P. borchgrevinki. Following 5-6 weeks of warm-acclimation (4 C) the plasma glucose concentration, haematocrit and haemoglobin concentration of P. borchgrevinki were not significantly different from fish at À1 C, but plasma osmolarity decreased toward the level found in temperate-water teleosts. # 2005 The Fisheries Society of the British Isles

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“…Recent studies have demonstrated that several Antarctic fishes like the zoarcid, Pachycara brachycephalum (6,11,33), and the notothenioids Pagothenia borchgrevinki (6,18), Harpagifer antarcticus (61), and even T. bernacchii (6,9,21) are able to acclimate to warmer temperatures. The Antarctic eelpout, P. brachycephalum ranged between high Antarctic and Subantarctic notothenioids with respect to heat tolerance and acclimation capacity (6).…”

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confidence: 99%

Thermal acclimation in Antarctic fish: transcriptomic profiling of metabolic pathways

Windisch

Kathöver

Pörtner

et al. 2011

American Journal of Physiology-Regulatory, Integrative and Comp

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It is widely accepted that adaptation to the extreme cold has evolved at the expense of high thermal sensitivity. However, recent studies have demonstrated significant capacities for warm acclimation in Antarctic fishes. Here, we report on hepatic metabolic reorganization and its putative molecular background in the Antarctic eelpout (Pachycara brachycephalum) during warm acclimation to 5°C over 6 wk. Elevated capacities of cytochrome c oxidase suggest the use of warm acclimation pathways different from those in temperate fish. The capacity of this enzyme rose by 90%, while citrate synthase (CS) activity fell by 20% from the very beginning. The capacity of lipid oxidation by hydroxyacyl-CoA dehydrogenase remained constant, whereas phosphoenolpyruvate carboxykinase as a marker for gluconeogenesis displayed 40% higher activities. These capacities in relation to CS indicate a metabolic shift from lipid to carbohydrate metabolism. The finding was supported by large rearrangements of the related transcriptome, both functional genes and potential transcription factors. A multivariate analysis (canonical correspondence analyses) of various transcripts subdivided the incubated animals in three groups, one control group and two responding on short and long timescales, respectively. A strong dichotomy in the expression of peroxisome proliferator-activated receptors-1α and -β receptors was most striking and has not previously been reported. Altogether, we identified a molecular network, which responds sensitively to warming beyond the realized ecological niche. The shift from lipid to carbohydrate stores and usage may support warm hardiness, as the latter sustain anaerobic metabolism and may prepare for hypoxemic conditions that would develop upon warming beyond the present acclimation temperature.

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Characterization of gill Na/K-ATPase activity and ouabain binding in Antarctic and New Zealand nototheniid fishes

Cited by 28 publications

References 27 publications

Environmental influences on regulation of blood plasma/serum components in teleost fishes: a review

Environmental influences on regulation of blood plasma/serum components in teleost fishes: a review

Plasma osmolarity, glucose concentration and erythrocyte responses of two Antarctic nototheniid fishes to acute and chronic thermal change

Thermal acclimation in Antarctic fish: transcriptomic profiling of metabolic pathways

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