ONX-0912 (as known as oprozomib), discovered during a medicinal chemistry effort using tripeptide epoxyketones, is an orally bio-available and potent proteasome inhibitor that inhibits growth and induces apoptosis in bortezomib resistant multiple myeloma (MM) cells. Although ONX-0912, an analog of carfilzomib, is structurally distinct from bortezomib, it possesses the same ability as bortezomib to predominantly inhibit chymotrypsin-like activity of the proteasome. ONX-0912 exhibits significant anti-MM activities to reduce tumor progression and prolong survival in many animal tumor model studies, which are associated with activation of caspase-3, caspase-8, caspase-9, and poly(ADP) ribose polymerase and inhibition of anglogensis and MM cells migration.
Reference
[1]Dharminder Chauhan, Ajita V. Singh, Monette Aujay, Christopher J. Kirk, Madhavi Bandi, Bryan Ciccarelli, Noopur Raje, Paul Richardson, and Kenneth C. Anderson. A novel oraaly active proteasome inhibitor ONX 0912 triggers in vitro and in vivo cytotoxicity in multiple myeloma. Blood 2010; 116(23): 4906-4915