KDM6 histone demethylase inhibitor GSK-J4 induces metal and stress responses in multiple myeloma cells [ZNSO]

ABSTRACT: Thioneins are cysteine-rich, evolutionary conserved apoproteins that regulate divalent metal homeostasis by virtue of their metal-chelation properties resulting in the ligand-bound metallothionein state. Previous studies have demonstrated a transient upregulation (102- 103-fold) of a cluster of metallothionein genes as part of a transcriptional response to a class of histone demethylase tool compounds targeting human Fe2+ dependent ketoglutarate oxygenases KDM6A (UTX) and KDM6B (JmjD3). Exposure of multiple myeloma cells to the prototypic bioactive KDM6 inhibitor GSK-J4 induces apoptotic cell death and transcriptomic profiles that are dominated by metal and metabolic stress response signatures. We here investigate the hypothesis that the metal-chelating property of GSK-J4 provides the means for transport and intracellular release of Zn2+ leading to a metallothionein transcriptomic response signature. Live cell imaging upon myeloma cell exposure to GSK-J4 shows a transient increase of intracellular free Zn2+ concentrations upon KDM6 inhibitor treatment consistent with a model of inhibitor mediated metal transport. Comparison of KDM6 inhibitor and ZnSO4 treatments in the presence or absence of metal chelators show that both treatment conditions induce different transcription factor repertoires with an overlapping MTF1 transcriptional regulation responsible for metallothionein and metal ion transport regulation.

ORGANISM(S): Homo sapiens

PROVIDER: GSE213292 | GEO | 2022/09/16

REPOSITORIES: GEO