Nutr Res Pract.  2007 Dec;1(4):247-253.

Alpha-Tocopherol Transfer Protein (alpha-TTP): Insights from Alpha-Tocopherol Transfer Protein Knockout Mice

Affiliations
  • 1Department of Food and Nutrition, Kyung Hee University, Seoul 130-701, Korea. ylim@khu.ac.kr
  • 2Department of Nutrition and Food Management, Linus Pauling Institute, Oregon State University, Corvallis, OR 97330, USA.

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.

Keyword

alpha-tocopherol; alpha-tocopherol transfer protein; vitamin E

MeSH Terms

alpha-Tocopherol*
Animals
Cytosol
Humans
Infertility
Lipoproteins
Liver
Metabolism
Mice
Mice, Knockout*
Muscle Weakness
Nervous System Diseases
Plasma
Vitamin E
Vitamin E Deficiency
Vitamins
Lipoproteins
Vitamin E
Vitamins
alpha-Tocopherol

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