Renal l-gulono-1,4-lactone oxidase activity as affected by dietary ascorbic acid in lake sturgeon ( Acipenser fulvescens )
Identifieur interne : 001614 ( Main/Exploration ); précédent : 001613; suivant : 001615Renal l-gulono-1,4-lactone oxidase activity as affected by dietary ascorbic acid in lake sturgeon ( Acipenser fulvescens )
Auteurs : Régis Moreau [États-Unis] ; Konrad Dabrowski [États-Unis] ; Paul H. Sato [États-Unis]Source :
- Aquaculture [ 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.
Url:
DOI: 10.1016/S0044-8486(99)00211-2
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Sato</name><affiliation wicri:level="4"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Pharmacology and Toxicology, Michigan State University, East Lansing, MI 48824</wicri:regionArea><placeName><region type="state">Michigan</region><settlement type="city">East Lansing</settlement></placeName><orgName type="university">Université d'État du Michigan</orgName></affiliation></author></analytic><monogr></monogr><series><title level="j">Aquaculture</title><title level="j" type="abbrev">AQUA</title><idno type="ISSN">0044-8486</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1999">1999</date><biblScope unit="volume">180</biblScope><biblScope unit="issue">3–4</biblScope><biblScope unit="page" from="359">359</biblScope><biblScope unit="page" to="372">372</biblScope></imprint><idno type="ISSN">0044-8486</idno></series><idno type="istex">9EAF8C1678F93280E58879FD22457BE47BE48924</idno><idno type="DOI">10.1016/S0044-8486(99)00211-2</idno><idno type="PII">S0044-8486(99)00211-2</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0044-8486</idno></seriesStmt></fileDesc><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></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Acide ascorbique</term><term>Acipenser fulvescens</term><term>Acipenseridae</term><term>Activité enzymatique</term><term>Besoin nutritif</term><term>Biosynthèse</term><term>L-Gulonolactone oxidase</term><term>Métabolisme</term><term>Rein</term><term>Régime alimentaire</term><term>Survie</term><term>Taux croissance</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><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></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Michigan</li><li>Ohio</li></region><settlement><li>East Lansing</li></settlement><orgName><li>Université d'État du Michigan</li></orgName></list><tree><country name="États-Unis"><region name="Ohio"><name sortKey="Moreau, Regis" sort="Moreau, Regis" uniqKey="Moreau R" first="Régis" last="Moreau">Régis Moreau</name></region><name sortKey="Dabrowski, Konrad" sort="Dabrowski, Konrad" uniqKey="Dabrowski K" first="Konrad" last="Dabrowski">Konrad Dabrowski</name><name sortKey="Sato, Paul H" sort="Sato, Paul H" uniqKey="Sato P" first="Paul H" last="Sato">Paul H. Sato</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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