Dietary protein level and dietary interaction affect quinolinic acid concentration in rats

Yukari Egashira, Mayuki Sato, Kuniaki Saito, Hiroo Sanada

研究成果: Article査読

4 被引用数 (Scopus)

抄録

During tryptophan-niacin conversion, hepatic α-amino-β- carboxymuconate-ε-semialdehyde decarboxylase (ACMSD) [EC4.1.1.45] plays a key role in regulating NAD biosynthesis. ACMSD activity is greatly affected by many factors such as nutritional status and disease. The tryptophan catabolite quinolinic acid has been reported to be associated with the pathogenesis of various disorders and is a potential endogenous toxin. However the effects of dietary protein levels or dietary interaction between protein levels and fatty acid type to this process have not been investigated and are still unknown. In this study, we examined whether dietary protein level, fatty acid type, namely saturated fatty acid and polyunsaturated fatty acid, and their interaction affect serum quinolinic acid concentration in rats. Male Sprague-Dawley rats (4-weeks old) were fed with 20% casein + 10% stearic acid diet (20C10S), 20% casein + 10% linoleic acid diet (20C10L), 40% casein + 10%stearic acid diet (40C10S), or 40% casein + 10% linoleic acid diet (40C10L) for 8 days, and serum quinolinic acid concentration and ACMSD activity were determined. Serum quinolinic acid concentration was significantly increased in the 40C10L group compared with other three groups. There was also the negative correlation between the sum of liver and kidney ACMSD activities, and serum quinolinic acid concentration per tryptophan intake (r = 0.8209, p < 0.01). Increased serum QA concentrations are probably due to a decreased ACMSD activity.

本文言語English
ページ(範囲)142-148
ページ数7
ジャーナルInternational Journal for Vitamin and Nutrition Research
77
2
DOI
出版ステータスPublished - 03-2007
外部発表はい

All Science Journal Classification (ASJC) codes

  • 医学(その他)
  • 内分泌学、糖尿病および代謝内科学
  • 栄養および糖尿病

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