N-acetyl-D-Leucine is not a substrate of LAT1 and PepT1, but rather an inhibitor of PepT1 with an IC50 of 0.74 mM.
N-acetyl-D-Leucine is a substrate of MCT1 with a Km of 1.0 mM and also an inhibitor of MCT1, with an IC50 of 11 mM.
N-acetyl-D-Leucine (1-5 mM; 7 days) did not show a significant dose-dependent effect on LysoTracker signals in NPC1-deficient Chinese hamster ovary cells, but a statistically significant effect was observed at higher concentrations (5 mM).