PMID: 3761021Sep 1, 1986Paper

Urea cycle activity and arginine formation in rainbow trout (Salmo gairdneri)

The Journal of Nutrition
Y N ChiuG L Rumsey

Abstract

Studies were conducted to determine whether rainbow trout fingerlings possess the ability to synthesize arginine via the urea cycle. Several urea cycle enzymes were detected in trout tissues. An experiment was conducted to determine whether the enzymes increase in response to starvation or in response to dietary protein level (0, 30, 40, 50% protein). Although some effects were observed, they did not appear to be consistent with the function of the urea cycle as a mechanism of detoxifying ammonia in the fish. The activities of kidney arginase and liver and muscle carbamoyl phosphate synthetase (CPS) were higher (P less than 0.05) when protein was omitted from the diet (P less than 0.05) than when it was present but were unaffected by protein level otherwise. The activities of liver arginase and kidney and muscle CPS and ornithine transcarbamoylase (OTC) were higher (P less than 0.05) in starved fish than in fish that received adequate levels of protein. Liver CPS and OTC were lower in starved fish than in fish fed 30% protein. L-[l-14C]ornithine hydrochloride and L-[carbamoyl-14C]citrulline, injected intraperitoneally, were incorporated into tissue arginine, a finding consistent with arginine biosynthesis via the urea cycle. Wh...Continue Reading

Citations

Sep 1, 1997·The Journal of Nutrition·R G Twibell, P B Brown
Jan 1, 1988·Nutrition Research Reviews·C B Cowey
May 15, 2020·Amino Acids·Xinyu LiGuoyao Wu
May 22, 2007·The Journal of Nutrition·Ronald O BallPaul B Pencharz
May 22, 2002·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·M F Gouillou-CoustansS J Kaushik
Apr 1, 1996·Comparative Biochemistry and Physiology. Part A, Physiology·G J Tattersall, P A Wright
Mar 20, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·P A Wright, M D Land
Jun 1, 1992·The International Journal of Biochemistry·S Türkoğlu, I Ozer
Aug 1, 2006·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·José Fernando Bibiano MeloGilberto Moraes
Feb 27, 2007·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·F TulliS J Kaushik
Jan 6, 1989·Science·T P Mommsen, P J Walsh

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