Aristolochic acid (AA) decreased renal mRNA expression of proximal tubule amino acid transporters. Kidney mRNA expression of Slc6a19 (B0AT1; A), Slc6a15 (B0AT2; B), Slc6a18 (B0AT3; C), and Slc7a9 (D) in mice treated with vehicle or AA. mRNA expression was normalized to the ribosomal protein L19 (Rpl19) gene. Values are means ± SE and dots show individual mouse data. Two-way ANOVA was performed to probe for a significant effect of treatment (PAA), genotypes (PSlc6a19), or the interaction between the two factors (Pinter). If the interaction was statistically significant, then a pair-wise multiple comparison procedure (Holm–Sidak method) identified the significant effects. *P < 0.05 vs. wild-type (WT) mice; #P < 0.05 vs. vehicle. n = 7–14 mice/group.