TAK-243 (MLN7243) is a selective inhibitor of the ubiquitin-activating enzyme UAE (IC50=1 nM). TAK-243 blocks ubiquitin binding and disrupts mono-ubiquitin signaling as well as overall protein ubiquitination. TAK-243 exhibits antitumor activity and promotes apoptosis.

METHODS: Seven myeloma cells were treated with TAK-243 (6.25-500 nM) for 24 h. Cell viability was measured by WST-1 Assay.
RESULTS: Most myeloma cells are very sensitive to TAK-243 with IC50 of 25-100 nM, e.g. MM1.S cells with IC50 of 25 nM. [1]
METHODS: Human colorectal cancer cells HCT-116 were treated with TAK-243 (0.008-1 µM) for 24 h, and the expression levels of target proteins were detected by Western Blot.
RESULTS: TAK-243 showed strong selectivity for Sumo and autophagic UBL pathways, and TAK-243 inhibited two E1 enzymes (UBA6 and UAE), which are capable of activating ubiquitin, with equal potency. [2]

METHODS: To assay antitumor activity in vivo, TAK-243 (12.5 mg/kg twice weekly; or 25 mg/kg once weekly) was administered intravenously for two weeks to SCID mice bearing myeloma MM1.S or MOLP-8.
S and MOLP-8 models, twice-weekly administration of 12.5 mg/kg produced 60% and 73% tumor growth inhibition at 14 days. 25 mg/kg produced a greater effect. [1]
METHODS: To test the antitumor activity in vivo, TAK-243 (20 mg/kg) was injected intravenously twice weekly into SCID mice bearing the human AML tumor OCI-AML2.
RESULTS: TAK-243 significantly delayed tumor growth (T/C=0.02) in mice without toxicity. [3]