Article
A reduced folate carrier mutation produces substrate-dependent alterations in carrier mobility in murine leukemia cells and methotrexate resistance with conservation of growth in 5-formyltetrahydrofolate.
The Journal of biological chemistry - 3 Apr 1998
Zhao R, Assaraf Y G, Goldman I D
Abstract excerpt
With 5-formyltetrahydrofolate (5-CHO-THF) as the folate source a methotrexate (MTX) transport-deficient murine leukemia cell line, L1210-G1a, was isolated after chemical mutagenesis and MTX selection. This cell line was 10-fold resistant to MTX in comparison to parental L1210 cells, yet the EC50 for 5-CHO-THF was increased by a factor of only 2. The initial uptake of MTX, at a concentration of 1 microM, was...
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