Renal L-gulono-1,4-lactone oxidase activity as affected by dietary ascorbic acid in lake sturgeon (Acipenser fulvescens)
Identifieur interne : 000373 ( PascalFrancis/Checkpoint ); précédent : 000372; suivant : 000374Renal L-gulono-1,4-lactone oxidase activity as affected by dietary ascorbic acid in lake sturgeon (Acipenser fulvescens)
Auteurs : R. Moreau [États-Unis] ; K. Dabrowski [États-Unis] ; P. H. Sato [États-Unis]Source :
- Aquaculture : (Amsterdam) [ 0044-8486 ] ; 1999.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Sturgeon can synthesize L-ascorbic acid (vitamin C) as they possess in their kidney L-gulono-1,4-lactone oxidase, the enzyme catalyzing the last step of AA biosynthesis. The effect of increasing dietary ascorbic acid on gulonolactone oxidase activity was studied in lake sturgeon. Two-year-old lake sturgeon (body weight 253 ± 89 g) were fed in triplicate groups with casein-based semipurified diets supplemented with either 0. 50, 250 or 1250 mg ascorbic acid/kg in the form of ascorbyl-2-monophosphate Mg for 38 days at 19.8°C. At the end of the trial, there were no significant differences in growth rate and survival among groups, Tissue total ascorbic acid concentrations increased significantly with dietary ascorbic acid. Renal gulonolactone oxidase activity was inconsistently affected by dietary treatment. These results suggested that, in sturgeon kidney unlike in the livers of ascorbic acid-synthesizing mammals, dietary ascorbic acid did not exert a negative feedback control on gulonolactone oxidase activity and thus on ascorbic acid synthesized. Using in vitro kinetics data we estimated a theoretical biosynthetic rate of ascorbic acid of 17 μmol (or 3 mg) per kilogram body weight per day at 15°C in juvenile lake sturgeon.
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Pascal:99-0496905Le document en format XML
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Ascorbic acid</term>
<term>Biosynthesis</term>
<term>Diet</term>
<term>Enzymatic activity</term>
<term>Growth rate</term>
<term>Kidney</term>
<term>L-Gulonolactone oxidase</term>
<term>Metabolism</term>
<term>Nutrient requirement</term>
<term>Survival</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Acide ascorbique</term>
<term>Régime alimentaire</term>
<term>Activité enzymatique</term>
<term>L-Gulonolactone oxidase</term>
<term>Rein</term>
<term>Besoin nutritif</term>
<term>Biosynthèse</term>
<term>Métabolisme</term>
<term>Taux croissance</term>
<term>Survie</term>
<term>Acipenser fulvescens</term>
<term>Acipenseridae</term>
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<front><div type="abstract" xml:lang="en">Sturgeon can synthesize L-ascorbic acid (vitamin C) as they possess in their kidney L-gulono-1,4-lactone oxidase, the enzyme catalyzing the last step of AA biosynthesis. The effect of increasing dietary ascorbic acid on gulonolactone oxidase activity was studied in lake sturgeon. Two-year-old lake sturgeon (body weight 253 ± 89 g) were fed in triplicate groups with casein-based semipurified diets supplemented with either 0. 50, 250 or 1250 mg ascorbic acid/kg in the form of ascorbyl-2-monophosphate Mg for 38 days at 19.8°C. At the end of the trial, there were no significant differences in growth rate and survival among groups, Tissue total ascorbic acid concentrations increased significantly with dietary ascorbic acid. Renal gulonolactone oxidase activity was inconsistently affected by dietary treatment. These results suggested that, in sturgeon kidney unlike in the livers of ascorbic acid-synthesizing mammals, dietary ascorbic acid did not exert a negative feedback control on gulonolactone oxidase activity and thus on ascorbic acid synthesized. Using in vitro kinetics data we estimated a theoretical biosynthetic rate of ascorbic acid of 17 μmol (or 3 mg) per kilogram body weight per day at 15°C in juvenile lake sturgeon.</div>
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<fC01 i1="01" l="ENG"><s0>Sturgeon can synthesize L-ascorbic acid (vitamin C) as they possess in their kidney L-gulono-1,4-lactone oxidase, the enzyme catalyzing the last step of AA biosynthesis. The effect of increasing dietary ascorbic acid on gulonolactone oxidase activity was studied in lake sturgeon. Two-year-old lake sturgeon (body weight 253 ± 89 g) were fed in triplicate groups with casein-based semipurified diets supplemented with either 0. 50, 250 or 1250 mg ascorbic acid/kg in the form of ascorbyl-2-monophosphate Mg for 38 days at 19.8°C. At the end of the trial, there were no significant differences in growth rate and survival among groups, Tissue total ascorbic acid concentrations increased significantly with dietary ascorbic acid. Renal gulonolactone oxidase activity was inconsistently affected by dietary treatment. These results suggested that, in sturgeon kidney unlike in the livers of ascorbic acid-synthesizing mammals, dietary ascorbic acid did not exert a negative feedback control on gulonolactone oxidase activity and thus on ascorbic acid synthesized. Using in vitro kinetics data we estimated a theoretical biosynthetic rate of ascorbic acid of 17 μmol (or 3 mg) per kilogram body weight per day at 15°C in juvenile lake sturgeon.</s0>
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<s5>05</s5>
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<s5>08</s5>
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<s5>08</s5>
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<s5>09</s5>
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<s5>10</s5>
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<s5>10</s5>
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<s5>64</s5>
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<s2>NS</s2>
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<s5>70</s5>
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<s5>14</s5>
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<s5>60</s5>
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<s2>NS</s2>
<s5>60</s5>
</fC07>
<fC07 i1="06" i2="X" l="SPA"><s0>Pisces</s0>
<s2>NS</s2>
<s5>60</s5>
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<fC07 i1="07" i2="X" l="FRE"><s0>Vertebrata</s0>
<s2>NS</s2>
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<fC07 i1="07" i2="X" l="ENG"><s0>Vertebrata</s0>
<s2>NS</s2>
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<fC07 i1="07" i2="X" l="SPA"><s0>Vertebrata</s0>
<s2>NS</s2>
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<fN21><s1>319</s1>
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