Modification by Exercise Training of Activity and Enzyme Expression of Hepatic Branched-Chain α-Ketoacid Dehydrogenase Complex in Streptozotocin-Induced Diabetic Rats

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The branched-chain a-ketoacid dehydrogenase (BCKDH) complex is the rate-limiting enzyme in the catabolism of branched-chain amino acids. In the present study, we examined the effects of exercise training on the activity and enzyme expression of the he-patic BCKDH complex in diabetic rats. The rats were prepared by intravenous injections of streptozotocin (50 mg/kg BWW), and exercise training was accomplished by treadmill run-ning for 45 min/d for 4 wk. The total and actual activities of hepatic BCKDH complex were significantly increased to 160% by 4 wk of diabetes. On the other hand, diabetic rats in the trained group had the same level of activities as those in the normal rats, indicating that ex-ercise training inhibited the diabetes-induced increase in the enzyme activities. The activity state (% active form) of the enzyme complex was about 100% in all groups and was not af-fected by diabetes or training. The protein amounts of the enzyme subunits (El a and E2) and the abundance of mRNA for the E2 subunit, but not for the other subunits, in the liver had the same trend as the activities. These results suggest that the capacity for branched-chain amino acid catabolism in streptozotocin-induced diabetic rats is reduced by exercise training and that this modification is associated with the suppression of diabetes-induced BCKDH complex expression in the liver.

収録刊行物

  • Journal of nutritional science and vitaminology

    Journal of nutritional science and vitaminology 47(5), 345-350, 2001-10-01

    財団法人 学会誌刊行センター

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各種コード

  • NII論文ID(NAID)
    10008015707
  • NII書誌ID(NCID)
    AA00703822
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    03014800
  • NDL 記事登録ID
    5988768
  • NDL 雑誌分類
    ZR2(科学技術--生物学--生化学)
  • NDL 請求記号
    Z53-B484
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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