Cloning and functional characterization of the bile acid–sensitive methotrexate carrier from rat liver cells
Walther Honscha, Kerstin U. Dötsch, Nadine Thomsen, Ernst Petzinger – 30 December 2003 – We have cloned two complementary DNAs (cDNAs), RL‐Mtx‐1 and RL‐Mtx‐2, corresponding to the bile acid‐ sensitive methotrexate carrier from rat liver by direct full‐length rapid amplification of cDNA ends polymerase chain reaction (RACE‐PCR) using degenerated primers that were deduced from published sequences of tumor cell methotrexate transporters. When expressed in Xenopus laevis oocytes and cosM6 cells, both clones mediate methotrexate and bumetanide transport.