title: True Niacin Deficiency in Quinolinic Acid Phosphoribosyltransferase (QPRT) Knockout Mice.
abstract: Pyridine nucleotide coenzymes (PNCs) are involved in over 500 enzyme reactions. PNCs are biosynthesized from the amino acid L-tryptophan (L-Trp), as well as the vitamin niacin. Hence, "true" niacin-deficient animals cannot be "created" using nutritional techniques. We wanted to establish a truly niacin-deficient model animal using a protocol that did not involve manipulating dietary L-Trp. We generated mice that are missing the quinolinic acid phosphoribosyltransferase (QPRT) gene. QPRT activity was not detected in qprt(-/-)mice. The qprt(+/+), qprt(+/-) or qprt(-/-) mice (8 wk old) were fed a complete diet containing 30 mg nicotinic acid (NiA) and 2.3 g L-Trp/kg diet or an NiA-free diet containing 2.3 g L-Trp/kg diet for 23 d. When qprt(-/-)mice were fed a complete diet, food intake and body weight gain did not differ from those of the qprt(+/+) and the qprt(+/-) mice. On the other hand, in the qprt(-/-) mice fed the NiA-free diet, food intake and body weight were reduced to 60% (p<0.01) and 70% (p<0.05) of the corresponding values for the qprt(-/-) mice fed the complete diet at day 23, respectively. The nutritional levels of niacin such as blood and liver NAD concentrations were also lower in the qprt(-/-) mice than in the qprt(+/+) and the qprt(+/-) mice. Urinary excretion of quinolinic acid was greater in the qprt(-/-) mice than in the qprt(+/+) and the qprt(+/-) mice (p<0.01). These data suggest that we generated truly niacin-deficient mice.
authors.affiliation: Department of Nutrition, School of Human Cultures, The University of Shiga Prefecture.
authors.forename: Katsumi
authors.initials: K
authors.lastname: Shibata
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009154:Mutation; D009243:NAD / Q000378:metabolism; D009525:Niacin / Q000172:deficiency* / Q000378:metabolism; D009752:Nutritional Status; D010430:Pentosyltransferases / Q000235:genetics / Q000378:metabolism*; D017378:Quinolinic Acid / Q000378:metabolism*; D014804:Vitamin B Deficiency / Q000201:enzymology / Q000378:metabolism*; D000098553:Nicotinate-Nucleotide Diphosphorylase (Carboxylating)
chemical_list: D009243:NAD; D009525:Niacin; D010430:Pentosyltransferases; D000098553:Nicotinate-Nucleotide Diphosphorylase (Carboxylating); D017378:Quinolinic Acid