2017 Fiscal Year Final Research Report
Mechanism of sex difference on vitamin E absorption and metabolism
| Project/Area Number |
15K07444
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Food science
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| Research Institution | Meiji University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | ビタミンE / α-tocopherol / 性差 / NPC1L1 / SR-BI / ラット |
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| Outline of Final Research Achievements |
Mechanisms for sex differences in intestinal absorption of vitamin E (α-tocopherol) were investigated with rats. First, we investigated fecal α-tocopherol excretion in male and female rats, castrated male rats and testosterone administered rats, and clarified that testosterone reduces α-tocopherol absorption. Next, Niemann-Pick C1-Like 1 (NPC1L1) activity was not demonstrated to be a cause for the sex difference of α-tocopherol absorption with rats administered with NPC1L1 inhibitor. Finally, we found that intestinal scavenger receptor class B type 1 (SR-BI) level was higher in females than in males and decreased by castration. From these results, we conclude that testosterone reduces intestinal SR-BI and α-tocopherol absorption, resulting in lower vitamin E concentration in male rats than female rats.
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| Free Research Field |
食品栄養化学、分子栄養学
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