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American Journal of Clinical Nutrition, Vol 58, 98-102, Copyright © 1993 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Dietary fish oil-induced changes in the distribution of alpha- tocopherol, retinol, and beta-carotene in plasma, red blood cells, and platelets: modulation by vitamin E

PP Nair, JT Judd, E Berlin, PR Taylor, S Shami, E Sainz and HN Bhagavan
Lipid Nutrition Laboratory, Beltsville Human Nutrition Research Center, USDA, MD 20705.

Healthy men (ages 24-57 y) were fed a controlled basal diet supplemented with 15 g/d of placebo oil (PO) for 10 wk followed by 15 g/d of fish-oil concentrate (FO) (fortified with 15 mg all-rac- tocopherol) for 10 wk without additional alpha-tocopherol and the last 8 wk with 200 mg alpha-tocopherol/d (FO+E). Compared with PO, FO raised plasma malondialdehyde; lowered alpha-tocopherol in plasma, red blood cells, and platelets; and raised plasma and platelet beta-carotene. Supplementation with additional alpha-tocopherol (FO+E) not only restored tocopherol concentrations but also reversed the rise in beta- carotene. The response in retinol, particularly in platelets, showed an inverse relationship to beta-carotene, alpha-tocopherol exhibiting a modulating effect on these changes. From these observations it is postulated that platelets may be a significant extraintestinal site of retinol formation from beta-carotene.


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Copyright © 1993 by The American Society for Nutrition