Metabolism and disposition of 2-methoxy-4-nitroaniline in male and female Harlan Sprague Dawley rats and B6C3F1/N mice
Mathews, J., Zhan, Q., Etheridge, A., Patel, P., Black, S. R., Banks, T. T., ... Waidyanatha, S. (2012). Metabolism and disposition of 2-methoxy-4-nitroaniline in male and female Harlan Sprague Dawley rats and B6C3F1/N mice. Xenobiotica, 42(12), 1213-1224. DOI: 10.3109/00498254.2012.697211
1. The disposition of 2-Methoxy-4-nitroaniline (MNA) was investigated in male and female Harlan Sprague Dawley rats and B6C3F(1)/N mice following oral, intravenous, and dermal exposure to [(14)C]MNA at 2, 15, or 150 mg/kg. Clearance of MNA was investigated in male and female rat, mouse, and human hepatocytes. 2. MNA was cleared slowly in hepatocytes from rat (t(1/2) = 152-424 min) and human (t(1/2) = 118-403 min) but faster in mouse (t(1/2)= 70-106 min). 3. MNA was well-absorbed in rats and mice following oral administration and eliminated chiefly in urine (rats, 75-79%; mice, 55-68%) 72 h post dosing. Less than 1% of the radioactivity remained in tissues at 72 h. MNA was poorly absorbed following dermal application in rats (5.5%) and mice (10%) over 24 h. 4. The major pathway of metabolism of MNA was via hydroxylation of the phenyl ring to form 6-hydroxy MNA; major metabolites detected were sulfate and glucuronide conjugates of 6-hydroxy MNA. 5. Following oral administration, the percent of total radioactivity bound in tissues bound was highest in liver (43%) and red blood cells (30%), whereas the radioactivity bound to DNA was highest in cecum (160 pmol/mg DNA).