Contributions of different NaPi cotransporter isoforms to dietary regulation of P transport in the pyloric caeca and intestine of rainbow trout

Sugiura, Shozo; Ferraris, Ronaldo P.

doi:10.1242/jeb.00971

Cited by 32 publications

(35 citation statements)

References 37 publications

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“…In case of fish, it is most likely that degradation of IP6 occurs in stomach since the pH of stomach is between 2.0 and 4.0 depending on the species. Sugiura & Ferraris (2004) reported that stomach of rainbow trout filled with feed had pH of chime around 4 and remained at the same unit even 6-9 h after feeding. Similarly, stomach pH of juvenile Japanese flounder after 1 h feeding was around 4.19 and became alkaline in intestine (Laining et al, 2010a).…”

Section: Fluctuation Of Post-prandial Plasma Mineral Level Of Juvenilmentioning

confidence: 98%

FLUCTUATION OF POST-PRANDIAL PLASMA MINERAL LEVEL OF JUVENILE JAPANESE FLOUNDER, Paralichthys olivaceus FED DIETARY PHOSPHORUS AND PHYTASE SUPPLEMENTATION

Laining

Rachmansyah

Lideman³

et al. 2010

Indonesian Aquaculture Journal

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In order to investigate the phytic acid degradation in the gut of post juvenile Japanese flounder, indirect method was carried out by measuring the pre-prandial and postprandial plasma mineral and alkaline phosphatase (ALP) level as well as liver phosphorus content. The experiment was designed into a Randomized Block in which experiment units were grouped according to sampling days at 10, 20 and 30 days of feeding time. Experimental diets contained three levels of dietary inorganic phosphorus at 0.0; 0.25 and 0.5% combined with two levels of dietary phytase at 0 and 2000 FTU/kg diet. Juvenile Japanese flounder (IBW = 36.2 g) were randomly distributed into 6 tanks of a 200 L capacity with density of 15 fish/tank. Blood sampling was carried out at 0 hour (before feeding or pre-prandial) and at 1, 3, 6 and 12 hour post feeding (post-prandial) time in three sampling days, respectively. Plasma was measured for mineral and ALP levels, while liver was analyzed for P content. The observation showed that fish fed without both dietary IP and phytase supplements had the lowest postprandial plasma IP, Mg and ALP levels during 12-h postprandial period. Plasma IP level at 6-h post-feeding in groups fed dietary 0.25 and 0.5% IP were significant higher when diet supplemented with phytase than those without phytase supplement. Peak level of plasma IP in fish fed 0.25% IP was similar to fish fed 0.5% with the presence of dietary phytase. At 1 and 3-h post-feeding, plasma Ca level increased in all groups, but significant difference was only observed between group fed diet without both dietary IP and phytase and other groups. Similar to plasma IP level, peak of plasma Mg and ALP concentration occurred in fish fed 0.25% IP together with phytase, and did not significantly differ from fish fed with 0.5% IP even when phytase was included in diet.

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Section: Fluctuation Of Post-prandial Plasma Mineral Level Of Juvenilmentioning

confidence: 98%

FLUCTUATION OF POST-PRANDIAL PLASMA MINERAL LEVEL OF JUVENILE JAPANESE FLOUNDER, Paralichthys olivaceus FED DIETARY PHOSPHORUS AND PHYTASE SUPPLEMENTATION

Laining

Rachmansyah

Lideman³

et al. 2010

Indonesian Aquaculture Journal

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“…First, postprandial gastric acidity tends to be low in fish. Our laboratory has shown that when the rainbow trout stomach was filled with food, the pH of the chyme was high and remained high (~4.0) even 6-9·h after feeding (Sugiura and Ferraris, 2004). It is well known that postprandial pH of mammalian stomach can reach 2 or less (Berne and Levy, 2000).…”

Section: Introductionmentioning

confidence: 94%

“…The pellets were dried at room temperature for 1.5·days, stored at 4°C, and fed within 2·weeks. Diets were analyzed for proximate compositions (Table·1) and P and calcium (Ca) concentrations (Table·2) according to the method described previously (Sugiura and Ferraris, 2004).…”

Section: Experimental Dietsmentioning

confidence: 99%

“…In the acidification (second) experiment, fecal samples were collected at the end of the feeding period by dissection from the rectum from six fish per dietary treatment, and analyzed individually for P, Ca and acid-insoluble ash (AIA) contents to determine digestibility of P, Ca and dry matter according to the method described previously (Sugiura and Ferraris, 2004).…”

Section: Chemical Analysesmentioning

confidence: 99%

“…The following GI sections were studied for luminal (chyme) and tissue adherent fluid pH: stomach (corpus area); pyloric caeca; pyloric small intestine (immediately posterior to the pyloric sphincter with many caecal junctions); small (proximal) intestine; and large (distal) intestine. Tissue definitions were described previously (Sugiura and Ferraris, 2004).…”

Section: Ph Measurementsmentioning

confidence: 99%

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Dietary acidification enhances phosphorus digestibility but decreases H+/K+-ATPase expression in rainbow trout

Sugiura

Roy

Ferraris

2006

Journal of Experimental Biology

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+/bicarbonate cotransporter (NBC), and had no effect on gastrin-like mRNA and somastostatin (SST) mRNA abundance. Gastrin-like mRNA and SST-2 mRNA were equally distributed between corpus and antrum. ATP4A mRNA and NBC mRNA were in the corpus, whereas SST-1 mRNA was in the antrum. Trout gastrin-like EST had modest homology to halibut and pufferfish gastrin, whereas trout ATP4A mRNA had у у95% amino acid homology with mammalian, Xenopus and flounder ATP4A. Although ATP4A seems highly conserved among vertebrates, gastric acidity is much less in trout than in rats, explaining the low digestibility of bone phosphorus, abundant in fish diets. Dietary acidification does not reduce acidity enough to markedly improve phosphorus digestibility, perhaps because exogenous acids may inhibit endogenous acid production.

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Coral Calcification Under Ocean Acidification and Global Change

Erez

Reynaud

Silverman

et al. 2010

Coral Reefs: An Ecosystem in Transition

155

174

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Coral reefs are unique marine ecosystems that form huge morphological structures (frameworks) in today's oceans. These include coral islands (atolls), barrier reefs, and fringing reefs that form the most impressive products of CaCO 3 biomineralization. The framework builders are mainly hermatypic corals, calcareous algae, foraminifera, and mollusks that together are responsible for almost 50% of the net annual CaCO 3 precipitation in the oceans. The reef ecosystem acts as a huge filtration system that extracts plankton from the vast fluxes of ocean water that flow through the framework. The existence of these wave resistant structures in spite of chemical, biological, and physical erosion depends on their exceedingly high rates of calcification. Coral mortality due to bleaching (caused by global warming) and ocean acidification caused by atmospheric CO 2 increase are now the major threats to the existence of these unique ecosystems. When the rates of dissolution and erosion become higher than the rates of precipitation, the entire coral ecosystem starts to collapse and will eventually be reduced to piles of rubble while its magnificent and high diversity fauna will vanish. The loss to nature and to humanity would be unprecedented and it may occur within the next 50 years. In this chapter, we discuss the issue of ocean acidification and its major effects of corals from the cell level to the reef communities. Based on the recently published literature, it can be generalized that calcification in corals is strongly reduced when seawater become slightly acidified. Ocean acidification lowers both the pH and the CO 3 2− ion concentration in the surface ocean, but calcification at the organism level responds mainly to CO 3 2− and not to pH. Most reports show that the symbiotic algae are not sensitive to changes in the carbonate chemistry. The potential mechanisms responsible for coral sensitivity to acidification are either direct input of seawater to the biomineralization site or high sensitivity of the enzymes involved in calcification to pH and/or CO 2 concentrations. Increase in pH at the biomineralization site is most probably the most energy demanding process that is influenced by ocean acidification. While hermatypic corals and other calcifiers reduce their rates of calcification, chemical and biological dissolution increase and hence net calcification of the entire coral reef is decreasing dramatically. Community metabolism in several sites and in field enclosures show in some cases net dissolution. Using the relations between aragonite saturation (W arag ) and community calcification, it is possible to predict that coral reefs globally may start to dissolve when atmospheric CO 2 doubles.

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Contributions of different NaPi cotransporter isoforms to dietary regulation of P transport in the pyloric caeca and intestine of rainbow trout

Cited by 32 publications

References 37 publications

FLUCTUATION OF POST-PRANDIAL PLASMA MINERAL LEVEL OF JUVENILE JAPANESE FLOUNDER, Paralichthys olivaceus FED DIETARY PHOSPHORUS AND PHYTASE SUPPLEMENTATION

FLUCTUATION OF POST-PRANDIAL PLASMA MINERAL LEVEL OF JUVENILE JAPANESE FLOUNDER, Paralichthys olivaceus FED DIETARY PHOSPHORUS AND PHYTASE SUPPLEMENTATION

Dietary acidification enhances phosphorus digestibility but decreases H+/K+-ATPase expression in rainbow trout

Coral Calcification Under Ocean Acidification and Global Change

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