RNA was isolated using the Isol-RNA lysis procedure (5 Prime, Hamburg, Germany). 25 μg of breast, kidney, liver and lung RNA of normal human samples were obtained from Agilent Technologies (Waldbronn, Germany). RNA was DNase (Fermentas GmbH, St.Leon-Rot, Germany) digested and then reversely transcribed19 (link). RT-PCR was performed with primers: ABCB4RTF1: GCAGACGGTGGCCCTGGTTGG, ABCB4RTR1: TGGAAAACAGCACCGGCTCCTG, ACTFW: CCTTCCTTCCTGGGCATGGAGTC and ACTRV: CGGAGTACTTGCGCTCAGGAGGA. For mouse mABCB4RTF1: CCCTCCAGCCGGCTTTCTCCA, mABCB4RTR1: GGACCGGAGCCTTGTGGTGAGG, mGAPDHRTF1: GCCGCCTGGAGAAACCTGCC and mGAPDHRTF1: CCCCGGCATCGAAGGTGGAA were utilized. Quantitative PCR (qRT-PCR) was performed in triplicates with PerfeCTa SYBR® Green (Quanta BioSciences, Gaithersburg, USA) using Rotor-Gene 3000 (Corbett Research, Qiagen, Hilden, Germany).
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