ap-1

AP-1, a miniaturized proteolysis-targeting chimera (PROTAC) incorporating an anaplastic lymphoma kinase (ALK) ligand connected to (±)-thalidomide via an ultrashort linker, effectively degrades ALK fusion proteins such as NPM-ALK in Karpas-299 cells and EML4-ALK and ALKF1174L in SN-N-SH and NCI H3122 cells, respectively. Concentrations ranging from 10 to 300 nM are sufficient for its action, which is hindered by the proteasome inhibitor MG-132. Demonstrating selectivity, AP-1 exhibits cytotoxicity towards ALK-dependent Karpas-299 cells with an IC50 value of 0.1265 nM, while showing significantly less toxicity to non-ALK-dependent THP-1 cells (IC50 = 2,704 nM). Furthermore, it effectively reduces tumor volume in NCI H3122 mouse xenograft models at doses of 25, 50, and 100 mg/kg.

FOSL1 degrader 1 (4) is a potent T-5224-PROTAC that effectively degrades FOSL1 (AP-1), thereby suppressing the expression of cancer stemness genes in HNSCC. By degrading FOSL1, it inhibits tumor growth and effectively eliminates cancer stem cells in HNSCC tumors. This compound demonstrates an efficacy 30 to 100 times greater than that of T-5224.

ALK protein ligand-1 (Compound A1) is an ALK protein ligand, acting as a ligand for the target protein in PROTACs, demonstrating inhibitory effects on ALK. It is also useful in the synthesis of AP-1.