L-778,123 showed no significant cytotoxicity (IC50:>100 μM) against HT-29 and A549 cell lines when used alone, but exhibited a synergistic effect with Doxorubicin, with IC50 values reduced to 1.72 and 1.52 μM, respectively.
L-778,123 inhibits the proliferation of myeloid leukemia cell lines, with IC50 values ranging from 0.2 μM to 1.8 μM, and IC50 values in primary samples ranging from 0.1 μM to 61.8 μM.
L-778,123 (0-1 μM, 12 hours; Or 5 μM, 6 hours) inhibits H-RAS isoprenoidization in HL-60 cells and suppresses phosphorylation of MEK-1/2 levels (5 μM, 24 hours).
L-778,123 (0-100 μM, 72 hours) inhibits lymphocyte activation (markers: CD71 or CD25) and function in human PBMCs.