Nutrition Research and Practice

The Korean Nutrition Society (한국영양학회)
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Alpha-Tocopherol Transfer Protein (${\alpha}$-TTP): Insights from Alpha-Tocopherol Transfer Protein Knockout Mice

  • Lim, Yun-Sook (Department of Food and Nutrition, Kyung Hee University) ;
  • Traber, Maret G. (Department of Nutrition and Food Management, Linus Pauling Institute, Oregon State University)
  • Published : 2007.12.31
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Abstract

Alpha-tocopherol transfer protein (${\alpha}$-TTP) is a liver cytosolic transport protein that faciliates ${\alpha}$-tocopherol (${\alpha}$-T) transfer into liver secreted plasma lipoproteins. Genetic defects in ${\alpha}$-TTP, like dietary vitamin E deficiency, are associated with infertility, muscular weakness and neurological disorders. Both human and ${\alpha}$-TTP deficient (${\alpha}-TTP^{-/-}$) mice exhibit severe plasma and tissue vitamin E deficiency that can be attenuated by sufficient dietary ${\alpha}$-T supplementations. In this review, we summarize the literature concerning studies utilizing the ${\alpha}-TTP^{-/-}$ mice. Levels of vitamin E in the ${\alpha}-TTP^{-/-}$ mice do not appear to be directly related to the amounts of dietary ${\alpha}$-T or to the levels of ${\alpha}$-TTP protein in tissues. The ${\alpha}-TTP^{-/-}$ mice appear to present a good model for investigating the specific role of ${\alpha}$-T in tissue vitamin E metabolism. Furthermore, ${\alpha}-TTP^{-/-}$ mice appear to be useful to elucidate functions of ${\alpha}$-TTP beyond its well recognized functions of transferring ${\alpha}$-T from liver to plasma lipoprotein fractions.

Keywords

References

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