Parenteral multivitamin supplementation induces both oxidant and antioxidant responses in the liver of newborn guinea pigs.
BACKGROUND
The multivitamin solution is a major component of photo-induced generation of peroxides in parenteral nutrition. The aim of this study was to determine whether the parenteral multivitamin preparation induces in the liver a peroxide-induced oxidant challenge or an antioxidant protection associated with the antiradical components of the solution.


METHODS
Newborn guinea pigs were infused with dextrose supplemented with peroxides (250 micromol/L H2O2 or 350 micromol/L tert-butylhydroperoxide) or with a multivitamin preparation (MVP, 1% vol/vol). After 4 days, total glutathione and a free radical-sensitive eicosanoid marker (prostaglandin I2 [PGI2]/total prostaglandins) were measured in livers.


RESULTS
There was a significant decrease in the PGI2/total prostaglandin ratio (mean +/- SEM) [dextrose: 0.068 +/- 0.007 vs. (dextrose + H2O2: 0.048 +/- 0.001, dextrose + TBH: 0.043 +/- 0.001)] and glutathione concentrations decreased [dextrose: 55 +/- 7 vs. (dextrose + H2O2: 37 +/- 7, dextrose + TBH: 18 +/- 7 nmol/mg protein)] after infusion of peroxides. Despite the peroxide load in the multivitamin solution, it did not alter the measured variables as prostanoid ratio remained at control concentrations (dextrose: 0.066 +/- 0.008 vs. dextrose + MVP: 0.065 +/- 0.006), as did glutathione levels (dextrose: 52 +/- 6 vs. dextrose + MVP: 45 +/- 7 nmol/mg prot).


CONCLUSIONS
In the liver of guinea pig pups, infused peroxides cause oxidation of membrane-derived prostanoids. The decrease in glutathione in response to administration of peroxides suggests consumption rather than a response to a free radical attack. Despite the oxidant load associated with peroxides generated in MVP, the multivitamin preparation protected membranes as the prostanoid ratio, and glutathione levels remained at control levels.
Chessex
P
P
Perinatal Service and Research Center, H pital Ste-Justine, University of Montreal, Quebec, Canada. brassard@justine.umontreal.ca
Lavoie
J C
JC
Laborie
S
S
Rouleau
T
T
D000818:Animals; D000831:Animals, Newborn; D019587:Dietary Supplements; D004195:Disease Models, Animal; D005978:Glutathione / Q000378:metabolism; D006168:Guinea Pigs; D007263:Infusions, Parenteral; D008099:Liver / Q000378:metabolism*; D010084:Oxidation-Reduction; D018384:Oxidative Stress / Q000187:drug effects; D010545:Peroxides / Q000008:administration & dosage / Q000494:pharmacology; D011453:Prostaglandins / Q000032:analysis; D014815:Vitamins / Q000008:administration & dosage* / Q000494:pharmacology
D010545:Peroxides; D011453:Prostaglandins; D014815:Vitamins; D005978:Glutathione