| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
We have demonstrated that vitamin E deficiency increased anxiety-like behavior in rats. As this anxiogenic effect was not observed in adrenaletomized rats, corticosterone secretion from the adrenal glands may play an important role. Since corticosterone secretion is regulated by the hypothalamic-pituitary-adrenal (HPA) axis, effect of vitamin E deficiency on HPA regulation was investigated in this study. Vitamin E deficiency enhanced corticosterone secretion in response to acute and chronic stress. Administration of ACTH and CRF increased plasma corticosterone while dexamethasone, a synthetic glucocorticoid, decreased corticosterone through negative feedback regulation; vitamin E deficiency did not affect these regulations. Exogenous corticosterone increased anxiety of adrenaletomized rats; this was not affected by vitamin E deficiency. In conclusion, the response of hypothalamus to stress and/or feedback regulation of corticosterone, is possibly altered by vitamin E deficiency.
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