Insufficient dietary vitamin e increases the concentration of 7beta-hydroxycholesterol in tissues of rats fed salmon oil.
This study was conducted to determine the interaction between the type of dietary fat (coconut oil or salmon oil) and the vitamin E concentration of the diet [10, 20, 40 or 240 mg alpha-tocopherol equivalents (alpha-toc)/kg] in relation to the concentration of 7beta-hydroxycholesterol (7beta-OH) in liver, plasma, LDL and erythrocytes of rats. In the rats whose diet contained salmon oil, the concentration of 7beta-OH was dependent on the dietary vitamin E concentration. Rats whose diet contained 10 mg alpha-toc/kg had significantly higher concentrations of 7beta-OH in all samples studied than those whose diet contained 20, 40 or 240 mg alpha-toc/kg. Increasing the dietary vitamin E concentration from 40 to 240 mg alpha-toc/kg did not reduce the concentration of 7beta-OH in any samples. In the rats whose diet contained coconut oil, the concentration of 7beta-OH was independent of the dietary vitamin E concentration in all samples. The study shows that insufficient vitamin E in the diet increases the formation of 7beta-OH in rats fed salmon oil, whereas a dietary vitamin E supply in excess of the requirement does not lower 7beta-OH concentrations compared with an adequate vitamin E supply.
Ringseis
Robert
R
Institut für Ernährungswissenschaften, Martin-Luther-Universität Halle-Wittenberg, Emil-Abderhaldenstraszligbeta;e 26, D-06108 Halle/Saale, Germany.
Eder
Klaus
K
D000818:Animals; D001835:Body Weight; D005247:Feeding Behavior; D005395:Fish Oils / Q000008:administration & dosage*; D006888:Hydroxycholesterols / Q000097:blood / Q000378:metabolism*; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D012474:Salmon; D014810:Vitamin E / Q000008:administration & dosage* / Q000378:metabolism
D005395:Fish Oils; D006888:Hydroxycholesterols; D014810:Vitamin E; C011724:cholest-5-en-3 beta,7 alpha-diol