Effect of plasma alpha-tocopherol on leukotriene E4 excretion in genetic vitamin E deficiency.

Studying the biological effects of vitamin e in humans is difficult because conditions involving vitamin E deficiency are usually associated with chronic multiple pathology. Genetic vitamin E deficiency caused by a deficient alpha-tocopherol transport protein offers unique possibilities for study of vitamin E effects since the patients can be studied in good general health. In such a patient we manipulated plasma alpha-tocopherol levels in a wide range by varying oral alpha-tocopherol supplements and measured urinary leukotriene E4 (LTE4) concentrations. LTE4 excretion proved inversely correlated to plasma alpha-tocopherol levels. This strongly suggests that in genetic vitamin E deficiency, alpha-tocopherol influences formation of leukotrienes in vivo.