ビタミンC栄養研究と遺伝的アスコルビン酸合成不能ラット : 生体異物との関連を中心として

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  • 堀尾 文彦
    名古屋大学農学部農芸化学科栄養化学研究室
  • 吉田 昭
    名古屋大学農学部農芸化学科栄養化学研究室

書誌事項

タイトル別名
  • Nutritional Studies of Ascorbic Acid with a Rat Mutant Unable to Synthesize Ascorbic Acid (ODS Rat).
  • ビタミン C エイヨウ ケンキュウ ト イデンテキ アスコルビンサン ゴウセイ

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1. ODS-od/ od rats (ODS rats) hereditarily unable to synthesize ascorbic acid have no hepatic L-gulonolactone oxidase activity. In ODS rats, the dietary requirement of ascorbic acid to maintain normal growth and to prevent scurvy is about 300 mg per kilogram diet. 2. In normal rats able to synthesize ascorbic acid, the administration of several types of xenobiotics caused a marked increase in urinary excretion of ascorbic acid and in the concentrations (of ascorbic acid) in various tissues. The administration of xenobiotics increased the biosynthesis of ascorbic acid in liver, and accelerated concomitantly the turnover of ascorbic acid in body. In guinea pigs unable to synthesize ascorbic acid, the dietary requirement of ascorbic acid was increased severalfold for improving the growth depression and the mortality due to xenobiotics, such as PCB. In ODS rats, the dietary requirement of ascorbic acid was increased several-fold by the administration of xenobiotics for the maximum induction of hepatic drug-metabolizing enzymes. 3. Acute ascorbic acid deficiency caused a hypercholesterolemia and an elevation of hepatic concentration of cholesterol due to the deppression of bile acid synthesis in ODS rats fed a cholesterol-containing diet or a PCB-containing diet. Moreover, the concentration of LDL-cholesterol in serum was higher in ascorbic acid-deficient ODS rats than in ODS rats fed a diet supplemented with an appropriate amount of ascorbic acid.

収録刊行物

  • ビタミン

    ビタミン 62 (7), 317-333, 1988

    公益社団法人 日本ビタミン学会

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