Reduced EZH1/2 expression in imipridone-treated cells correlates with synergy following combinations with EZH1/2 or HDAC inhibitors in diffuse glioma and other tumors.

ABSTRACT: Small molecule imipridones including ONC201, ONC206 and ONC212 have anti-cancer activity mediated in part through the integrated stress response, induction of TRAIL and its receptor DR5, and activation of mitochondrial caseinolytic protease ClpP with impaired oxidative phosphorylation. ONC201 provides clinical benefit in a subset of patients with histone H3K27M-mutated diffuse glioma (DG). We hypothesized that EZH2 inhibitors (EZH2i) may sensitize tumors to imipridones by mimicking H3K27M mutation. EZH1 is a homolog and alternative for EZH2 in assembling PRC2 complex. We combined ONC201, ONC206 or ONC212 plus dual EZH1/2i in tumors and observed synergy. We observed synergies with imipridones combined with HDACi or triple combination of ONC201/ONC206, EZH2i and HDACi in DG, GBM, prostate ca

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC11982711 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature