L-AP3 is a potent antagonist of metabotropic glutamate receptor (mGluR), demonstrating inhibitory effects on D-phosphoserine and L-phosphoserine with IC50 values of 368 μM and 2087 μM, respectively.
20-O-Demethyl-AP3 is a secondary metabolite derived from Ansamitocin P-3, and Ansamitocin P-3 is a macrocyclic antitumor antibiotic exerting its therapeutic effects by inhibiting microtubules.
AEG40826 (HGS1029) is the hydrochloride salt of a small-molecule inhibitor of IAP (Inhibitor of Apoptosis Protein) family proteins with potential antineoplastic activity. IAP inhibitor HGS1029 selectively inhibits the biological activity of IAP proteins, which may restore apoptotic signaling pathways; this agent may work synergistically with cytotoxic drugs to overcome tumor cell resistance to apoptosis. IAPs are overexpressed by many cancer cell types, suppressing apoptosis by binding and inhibiting active caspases-3, -7 and -9 via their BIR (baculoviral lAP repeat) domains.