Plasma and liver metformin and imatinib concentrations in Oct1-deficient mice. A, plasma concentrations of imatinib in wild-type (black circles) and Oct1/2(−/−) knockout mice (open circles) after tail vein injection of imatinib (50 mg/kg). Animals were sacrificed at indicated time points. Data are means ± SD of 5 (1, 5, 10 minutes) or 2 (30 minutes) animals per group. B, plasma and liver metformin (left scale) and imatinib (right scale) concentrations after tail vein injection of metformin (i.v., 5 mg/kg) or imatinib (i.v. 50 mg/kg) into wild-type or Oct1/2(−/−) knockout mice or after oral gavage to wild-type or Oct1(−/−) knockout mice (imatinib oral, 50 mg/kg). Animals were sacrificed after 10 minutes and 60 minutes after i.v. or oral application, respectively. Data are means ± SD of animals treated with imatinib (n=5) or metformin.