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

Yukari Egashira, Mayuki Sato, Kuniaki Saito, Hiroo Sanada

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)142-148
Number of pages7
JournalInternational Journal for Vitamin and Nutrition Research
Volume77
Issue number2
DOIs
Publication statusPublished - 01-03-2007
Externally publishedYes

Fingerprint

Quinolinic Acid
Carboxy-Lyases
Dietary Proteins
Caseins
dietary protein
casein
Diet
Linoleic Acid
Tryptophan
acids
tryptophan
rats
linoleic acid
Serum
diet
Fatty Acids
stearic acid
fatty acids
diet-related diseases
liver

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Food Science

Cite this

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title = "Dietary protein level and dietary interaction affect quinolinic acid concentration in rats",
abstract = "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.",
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Dietary protein level and dietary interaction affect quinolinic acid concentration in rats. / Egashira, Yukari; Sato, Mayuki; Saito, Kuniaki; Sanada, Hiroo.

In: International Journal for Vitamin and Nutrition Research, Vol. 77, No. 2, 01.03.2007, p. 142-148.

Research output: Contribution to journalArticle

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AU - Egashira, Yukari

AU - Sato, Mayuki

AU - Saito, Kuniaki

AU - Sanada, Hiroo

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