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Neuro Oncol. 2013 Dec;15(12):1652-63. doi: 10.1093/neuonc/not118. Epub 2013 Oct 24.

A miR-297/hypoxia/DGK-α axis regulating glioblastoma survival.

Author information

  • 1Corresponding Authors: Benjamin Kefas, B. Pharm, MSc, PhD, University of Virginia Health System, Old Medical School, Rooms 4885/4881, 21 Hospital Drive, Charlottesville, VA 22908. bak4x@virginia.edu); Benjamin Purow, MD, University of Virginia Health System, Old Medical School, Rooms 4885/4881, 21 Hospital Drive, Charlottesville, VA 22908 (bwp5g@virginia.edu.

Abstract

BACKGROUND:

Despite advances in the treatment of the most aggressive form of brain tumor, glioblastoma, patient prognosis remains disappointing. This failure in treatment has been attributed to dysregulated oncogenic pathways, as observed in other tumors. We and others have suggested the use of microRNAs (miRs) as therapeutic tools able to target multiple pathways in glioblastoma.

METHODS:

This work features PCR quantification of miRs and transient transfection of many glioblastoma cell lines with miRs, followed by cell number analysis, trypan blue staining, alamarBlue assay of cell viability, caspase-3/-7 activity assay, immunoblot of cleaved poly(ADP-ribose) polymerase and fluorescence activated cell sorting and imaging of apoptotic nuclei, cell invasion assays, MRIs of glioblastoma xenografts in mice using transiently transfected cells as well as posttumor treatment with lentiviral vector encoding miR-297, and analysis of miR-297 target diacylglycerol kinase (DGK)-α including immunoblot, 3'UTR luciferase activity, and rescue with DGK-α overexpression. Cell counts and DGK-α immunoblot were also analyzed in the context of hypoxia and with overexpression of heterogeneous ribonucleoprotein L (hnRNPL).

RESULTS:

We identified miR-297 as a highly cytotoxic microRNA in glioblastoma, with minimal cytotoxicity to normal astrocytes. miR-297 overexpression reduced in vitro invasiveness and in vivo tumor formation. DGK-α is shown to be a miR-297 target with a critical role in miR-297 toxicity. In addition, hypoxia and its mediator hnRNPL upregulated DGK-α and buffered the cytotoxic effects of miR-297.

CONCLUSION:

This work shows miR-297 as a novel and physiologic regulator of cancer cell survival, largely through targeting of DGK-α, and also indicates that hypoxia ameliorates miR-297 toxicity to cancer cells.

KEYWORDS:

apoptosis; cancer; diacylglycerol kinase-alpha; glioblastoma; hypoxia; microRNA-297

PMID:
24158111
[PubMed - indexed for MEDLINE]
PMCID:
PMC3829588
[Available on 2014/12/1]
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