Uptake of L-[3H]amino acids (PerkinElmer Life Sciences) was measured in oocytes expressing wild-type and mutant ASCT1, and uninjected oocytes. Five oocytes were incubated in Cl-containing buffer with 10 µM L-[3H]amino acids at room temperature. After 10 min, uptake was terminated by three rapid washes in ice-cold Cl-containing buffer followed by lysis in 50 mM NaOH and 1% SDS. L-[3H]amino acids were measured by scintillation counting using a Trilux beta counter (PerkinElmer Life Sciences).
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