Tissue Distribution of Menaquinone-7 and the Effect of α-Tocopherol Intake on Menaquinone-7 Concentration in Rats

  • IKEDA Saiko
    Department of Nutritional Sciences, Nagoya University of Arts and Sciences
  • HANZAWA Fumiaki
    Department of Nutritional Sciences, Nagoya University of Arts and Sciences
  • TAKAHASHI Saki
    Department of Nutritional Sciences, Nagoya University of Arts and Sciences
  • SUZUKI Norie
    Department of Nutritional Sciences, Nagoya University of Arts and Sciences
  • SANO Kana
    Department of Nutritional Sciences, Nagoya University of Arts and Sciences
  • ODA Hiroaki
    Graduate School of Bioagricultural Sciences, Nagoya University
  • UCHIDA Tomono
    Department of Home Economics, Aichi Gakusen University

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Abstract

<p>We have reported that vitamin E intake lowers phylloquinone (PK) concentration in extrahepatic tissues of rats. In this study, we aimed to clarify the characteristic of the distribution of menaquinone-7 (MK-7), a vitamin K contained in fermented foods, by comparison with other vitamin K distributions and to clarify the effect of vitamin E intake on MK-7 concentration in rats. Rats were fed a vitamin K-free diet (Free group), a diet containing 0.75 mg PK/kg (PK group), a 0.74 mg menaquinone-4 (MK-4)/kg diet (MK-4 group), a 1.08 mg MK-7/kg diet (MK-7 group), or a 0.29 mg menadione (MD)/kg diet (MD group) for 16 wk. MK-7 mainly accumulated in the liver, spleen, and adrenal gland of the MK-7 group, although PK accumulated in the serum and all tissues of the PK group. Conversely, MK-4 was present in all tissues of the PK, MK-4, MK-7, and MD groups. MK-4 concentration in the serum, liver, adipose tissue, and spleen was higher in the MK-4 group than in the other groups; however, MK-4 concentration in the kidney, testis, tibia, and brain was lower in the MK-4 group than in the PK, MK-7, and MD groups. Next, vitamin E- and K-deficient rats were orally administered MK-7 with or without α-tocopherol. α-Tocopherol did not affect MK-7 or MK-4 concentration in the serum and various tissues. These results suggested that MK-7 is particularly liable to accumulate in the liver, and MK-7 concentration is not affected by vitamin E intake.</p>

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