LV-320 is a potent and uncompetitive ATG4B inhibitor with an IC50 of 24.5 μM and a Kd of 16 μM. It inhibits ATG4B enzymatic activity, blocks autophagic flux in cells, and is stable, non-toxic, and active in vivo.
- Increases endogenous LC3B-II and protein p62 levels in SKBR3, MCF7, JIMT1, and MDA-MB-231 cells in a dose-dependent manner.
- Blocks autophagic flux in MDA-MB-231 cells.
- Achieves terminal blood levels of 169 μM and liver levels of 104 μM in GFP-LC3 mice following oral gavage.
- Significantly increases the accumulation of GFP-LC3 puncta and LC3B-II protein in treated animals without causing significant toxicity at tested doses.