Abstract
We investigated the effects of vitamin E deficiency on the monoamine metabolism in the rat brain. Male Wistar rats fed on the vitamin E deficient diet for 24 weeks were analyzed. At 28 weeks, they showed a reduced growth rate (52% of reduction), muscle atrophy, a motor weakness of hind limbs and disturbance of gait. The concentrations of monoamines, their precursors and metabolites in the brain were simultaneously determined using high performance liquid chromatography (HPLC) coupled with a coulometric detection with electrode array system. In addition, tryptophan hydroxylase activity was measured. The dopamine (p = 0.009) and serotonin (p = 0.04) levels in the brain stem of vitamin E deficients rats were significantly lower than in the controls, whereas their precursors tyrosine (p = 0.0009) and tryptophan (p = 0.0065) levels in the brain stem were significantly higher than in the controls. Moreover, tryptophan hydroxylase activity (p = 0.0005) in the brain stem of vitamin E deficient brains was significantly lower than in the controls. All statistical comparisons were done using non-parametric tests (Mann-Whitney U test). These results suggest that vitamin E deficiency may play a role in the disturbance of monoamine metabolism in rat brain.
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Adachi, K., Izumi, M. & Mitsuma, T. Effect of Vitamin E Deficiency on Rat Brain Monoamine Metabolism. Neurochem Res 24, 1307–1311 (1999). https://doi.org/10.1023/A:1020937409855
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DOI: https://doi.org/10.1023/A:1020937409855