PT - JOURNAL ARTICLE AU - David W. Hein AU - Jean Bendaly AU - Jason R. Neale AU - Mark A. Doll TI - Systemic Functional Expression of <em>N</em>-Acetyltransferase Polymorphism in the F344 <em>Nat2</em> Congenic Rat AID - 10.1124/dmd.108.023960 DP - 2008 Dec 01 TA - Drug Metabolism and Disposition PG - 2452--2459 VI - 36 IP - 12 4099 - http://dmd.aspetjournals.org/content/36/12/2452.short 4100 - http://dmd.aspetjournals.org/content/36/12/2452.full SO - Drug Metab Dispos2008 Dec 01; 36 AB - Rat lines congenic for the rat N-acetyltransferase 2 [(RAT)Nat2] gene were constructed and characterized. F344 (homozygous Nat2 rapid) males were mated to Wistar Kyoto (homozygous Nat2 slow) females to produce heterozygous F1. F1 females were then backcrossed to F344 males. Heterozygous acetylator female progeny from this and each successive backcross were identified by rat Nat2 genotyping and mated with F344 rapid acetylator males. After 10 generations of backcross mating, heterozygous acetylator brother/sister progeny were mated to produce the homozygous rapid and slow acetylator Nat2 congenic rat lines. p-Aminobenzoic acid (selective for rat NAT2) and 4-aminobiphenyl N-acetyltransferase activities were expressed in all tissues examined (liver, lung, esophagus, stomach, small intestine, colon, pancreas, kidney, skin, leukocytes, and urinary bladder in male and female rats and in breast of female and prostate of male rats). NAT2 expression in rat extrahepatic tissues was much higher than that in liver. In each tissue, activities were Nat2-genotype-dependent, with the highest levels in homozygous rapid acetylators, intermediate levels in heterozygous acetylators, and lowest in homozygous slow acetylators. Sulfamethazine (selective for rat NAT1) N-acetyltransferase activities were observed in all tissues examined in both male and female rats except for breast (females), bladder, and leukocytes. In each tissue, the activity was Nat2 genotype-independent, with similar levels in homozygous rapid, heterozygous, and homozygous slow acetylators. These congenic rat lines are useful for investigating the role of NAT2 genetic polymorphisms in susceptibility to cancers related to arylamine carcinogen exposures. The American Society for Pharmacology and Experimental Therapeutics