性成熟と血中および肝組織内ビタミンK濃度

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  • Sexual Maturation and Vitamin K Levels in Plasma and the Liver

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The concentration of vitamin K in the hepatic tissues and plasma, and that of the sex steroid hormones in plasma of Wistar-lmamichi rats fed with a commercial diet were measured at 2, 4, 6 and 10 weeks of age in the male rats and at 2, 4, 6 and 9 weeks of age in the female rats.<br>At 6 week-old, the level of PK and MK-4 in the hepatic tissues were 23.37±3.51ng/g, and 10.89±2.24ng/g, respectively, in the female rats, which were significantly higher than those in the age-matched male rats. The plasma levels of PK and MK-4 in female rats were also higher than those in the male rats.<br>The plasma estradiol level at 6 week-old (42.35±18.17pg/ml) in female rats were higher than those at 4 week-old. The plasma progesterone level at 6 week-old (29.00±19.96ng/ml) in female rats were higher than those at 4 week-old. In male rats, the plasma testosterone level were 0.18±0.12ng/ml at 6 week-old, and 2.16±0.65ng/ml at 10 weekold. The plasma estradiol level also icreased in accordance with sexual maturation.<br>In both male and female rats, the liver PK and MK-4 level increased in accordance with sexual maturation (Fig. 7, 8). These findings suggest that estradiol and testosterone are engaged in increasing the vitamin K level in the hepatic tissues.

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