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The oncometabolite R-2-hydroxyglutarate activates NF-?B-dependent tumor-promoting stromal niche for acute myeloid leukemia cells.


ABSTRACT: Mutations of isocitrate dehydrogenase 1 (IDH1) and IDH2 in acute myeloid leukemia (AML) cells produce the oncometabolite R-2-hydroxyglutarate (R-2HG) to induce epigenetic alteration and block hematopoietic differentiation. However, the effect of R-2HG released by IDH-mutated AML cells on the bone marrow microenvironment is unclear. Here, we report that R-2HG induces I?B kinase-independent activation of NF-?B in bone marrow stromal cells. R-2HG acts via a reactive oxygen species/extracellular signal-regulated kinase (ERK)-dependent pathway to phosphorylate NF-?B on the Thr254 residue. This phosphorylation enhances the interaction of NF-?B and the peptidyl-prolyl cis-trans isomerase PIN1 and increases the protein stability and transcriptional activity of NF-?B. As a consequence, R-2HG enhances NF-?B-dependent expression of cytokines including IL-6, IL-8 and complement 5a to stimulate proliferation of AML cells. In addition, R-2HG also upregulates vascular endothelial adhesion molecule 1 and CXCR4 in stromal cells to enhance the contact between AML and stromal cells and attenuates chemotherapy-induced apoptosis. More importantly, we validated the R-2HG-activated gene signature in the primary bone marrow stromal cells isolated from IDH-mutated AML patients. Collectively, our results suggest that AML cell-derived R-2HG may be helpful for the establishment of a supportive bone marrow stromal niche to promote AML progression via paracrine stimulation.

SUBMITTER: Chen JY 

PROVIDER: S-EPMC5006242 | BioStudies | 2016-01-01

REPOSITORIES: biostudies

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