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.