title: Effects of dietary polyamine precursors on the metabolism and tissue concentrations of amino acids in the rat.
abstract: Experiments were conducted to determine the effects of dietary supplements of amino acid precursors of polyamines on amino acid metabolism in the rat in order to better understand comparative aspects of polyamine metabolism. Rats were fed isonitrogenous combinations of methionine, ornithine, arginine and 2-difluoromethylornithine in casein-based diets. It was observed that hepatic concentrations of methionine, 5'-deoxy-5'-methylthioadenosine and decarboxylated S-adenosylmethionine were more easily influenced by diet than were arginine and metabolites. It was concluded that rats may be more refractory to exogenous polyamine precursor amino acids than are chicks because of the presence of a functional urea cycle.
authors: Department of Biochemistry, University of Kuopio, Finland.
authors: T K
authors: TK
authors: Smith
authors: L
authors: L
authors: Lindqvist
authors: L
authors: L
authors: Alakuijala
authors: T O
authors: TO
authors: Eloranta
mesh_terms: D000241:Adenosine / Q000494:pharmacology; D000596:Amino Acids / Q000378:metabolism* / Q000652:urine; D000818:Animals; D001120:Arginine / Q000494:pharmacology; D015317:Biogenic Polyamines / Q000494:pharmacology*; D003839:Deoxyadenosines; D004032:Diet; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D008297:Male; D008715:Methionine / Q000494:pharmacology; D009132:Muscles / Q000187:drug effects / Q000378:metabolism; D009952:Ornithine / Q000494:pharmacology; D012345:RNA, Transfer, Amino Acid-Specific / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D012436:S-Adenosylmethionine / Q000494:pharmacology / Q000031:analogs & derivatives; D013872:Thionucleosides / Q000494:pharmacology
chemical_list: D000596:Amino Acids; D015317:Biogenic Polyamines; D003839:Deoxyadenosines; D012345:RNA, Transfer, Amino Acid-Specific; D013872:Thionucleosides; C012702:S-adenosyl-3-methylthiopropylamine; C008500:5'-methylthioadenosine; D012436:S-Adenosylmethionine; D001120:Arginine; D008715:Methionine; D009952:Ornithine; D000241:Adenosine