R. Moreau et al., Vitamin C vitamin E interaction in juvenile lake sturgeon (Acipenser fulvescens R.), a fish able to synthesize ascorbic acid, J APP ICHTH, 15(4-5), 1999, pp. 250-257
Citations number
31
Categorie Soggetti
Aquatic Sciences
Journal title
JOURNAL OF APPLIED ICHTHYOLOGY-ZEITSCHRIFT FUR ANGEWANDTE ICHTHYOLOGIE
The hypothesis that vitamin C interacts with vitamin E in vivo was investig
ated in juvenile lake sturgeon. Ten-month old lake sturgeon were fed diets
supplemented with either 0 or 1250 mg ascorbic acid/kg diet concomitantly w
ith either 0 or 200 mg alpha-tocopherol/kg diet for 7 weeks at 17 degrees C
. Dietary vitamin C supplement resulted in significant increases of ascorba
te concentrations in the posterior kidney and liver of sturgeon. Dietary vi
tamin E omission affected liver concentrations of alpha-tocopherol (10.0 +/
- 4.5 mu g/g) in comparison to sturgeon fed a diet supplemented with vitami
n E and vitamin C (99.5 +/- 22.9 mu g/g). Dietary vitamin C supplement decr
eased liver alpha-tocopherol concentration in vitamin E-deprived sturgeon.
Also, vitamin E supplement lowered posterior kidney and fiver ascorbic acid
concentrations in vitamin C-deprived sturgeon. Gulonolactone oxidase and d
ehydroascorbic acid reductase activities were stimulated in groups fed vita
min C. Thiobarbituric acid-reactive substances concentrations (an indicator
of lipid peroxidation) were higher in sturgeon fed either of vitamins as c
ompared to sturgeon deprived of both vitamins. The results suggested that l
arge doses of vitamins C and E may be prooxidant in vivo.