Exit characteristics of 14C-labeled leucine from ehrlich ascites tumor cells.

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Abstract
The exit mechanisms of D- and L-leucine compared with those of D- and L-alanine were examined. The exit processes of D- and L-amino acids appear to be unsaturable under physiological conditions. The exit velocities of D-leucine and D-alanine were slower than those of the corresponding L-amino acid under various conditions. A marked increase in the exit velocity of L-leucine was observed in the presence of gramicidin D. This may be due to the operation of a Na+-dependent carrier process. The exit of D-leucine was not accelerated, suggesting that the exit of D-leucine is little mediated by a Na+-dependent process though the influx of D-leucine as well as that of L-leucine was partly mediated by a Na+-dependent process.

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