The proliferation effects of MTA-cooperative PRMT5 inhibitors, TNG908 or TNG462, and a SAM-cooperative PRMT5 inhibitor, GSK3326595, on MTAP-deleted and MTAP-intact MPNST cell lines were determined using CellTiter-Glo (CTG) assays. The clinical stage MTA-cooperative PRMT5 inhibitors TNG908 (NCT05275478) and TNG462 (NCT05732831) are efficacious in MPNST models in vitro and in vivo and are therefore promising therapeutic agents for patients with MTAP-deleted MPNST.
By binding to and inhibiting PRMT5 cooperatively with MTA, TNG462 leverages the synthetic lethal relationship between MTAP deletion and PRMT5 to selectively kill MTAP-deleted cells with a mean 45-fold selectivity over MTAP-proficient cells. Herein we report on the discovery of TNG462, a potential best-in-class, potent, and selective MTA-cooperative PRMT5 inhibitor for the treatment of MTAP-deleted cancer.