Hw. Chen et al., VITAMIN-E-DEFICIENCY INCREASES SERUM THROMBOXANE-A(2), PLATELET ARACHIDONATE AND LIPID-PEROXIDATION IN MALE SPRAGUE-DAWLEY RATS, Prostaglandins, leukotrienes and essential fatty acids, 51(1), 1994, pp. 11-17
This study was designed to determine whether dietary linoleate and all
-rac-alpha-tocopheryl acetate (vitamin E) interact to affect serum thr
omboxane A(2) (TXA(2)) and prostacyclin (PGI(2)) status and therefore,
thrombogenic potential. 6 groups of 12 weanling male Sprague-Dawley r
ats were fed semipurified diets containing 11 or 18% of energy from li
noleate and 0, 100 or 5000 mg vitamin E/kg diet for 10 weeks. Platelet
and serum a-tocopherol concentrations increased logarithmically with
increasing dietary vitamin E. Serum TXA(2), measured as TXB(2), platel
et arachidonate and thiobarbituric acid reactive substances were signi
ficantly greater in the vitamin E deficient groups than in groups rece
iving vitamin E (p < 0.05). Serum PGI(2) levels, determined as 6-keto-
PGF(1 alpha), were not affected by diets. No interaction was found bet
ween dietary linoleate and vitamin E. However, vitamin E supplementati
on produced significantly less serum TXB(2) than did vitamin E deficie
nt diets (p < 0.05). Vitamin E deficiency may be prothrombogenic by in
creasing platelet arachidonate, lipid peroxidation and serum TXA(2) le
vels while vitamin E supplementation at levels used in this study may
decrease such effects.