Journal
ANTICANCER RESEARCH
Volume 41, Issue 12, Pages 6067-6076Publisher
INT INST ANTICANCER RESEARCH
DOI: 10.21873/anticanres.15426
Keywords
Glioblastoma; menadione; ascorbate; temozolomide; magnetic resonance imaging
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Funding
- QST/ICM - IC-MedTech Corp., US
- AMED - Japanese Agency for Medical Research and Development [16cm0106202h]
- Kakenhi - Japanese Agency for Promotion of Science [21H04966, 17KK0102]
- Grants-in-Aid for Scientific Research [21H04966, 17KK0102] Funding Source: KAKEN
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The research demonstrates that M/A is a more tolerable pharmacological strategy for selectively targeting glioblastoma, suppressing tumor growth. M/A induces overproduction of mitochondrial superoxide specifically in glioblastoma cells, distinguishing them from normal microglial cells.
Background/Aim: We describe a pharmacological strategy for selectively targeting glioblastoma using a redoxactive combination drug menadione/ascorbate (M/A), compared to the chemotherapeutic standard-of-care temozolomide (TMZ). Materials and Methods: Experiments were conducted on glioblastoma mice (GS9L cell transplants - intracranial model), treated with M/A or TMZ. Tumor growth was monitored by magnetic resonance imaging. Effects of M/A and TMZ on cell viability and overproduction of mitochondrial superoxide were also evaluated on isolated glioblastoma cells (GS9L) and normal microglial cells (EOC2). Results: M/A treatment suppressed tumor growth and increased survival without adverse drug-related side effects that were characteristic of TMZ. Survival was comparable with that of TMZ at the doses we have tested so far, although the effect of M/A on tumor growth was less pronounced than that of TMZ. M/A induced highly specific cytotoxicity accompanied by dose-dependent overproduction of mitochondrial superoxide in glioblastoma cells, but not in normal microglial cells. Conclusion: M/A differentiates glioblastoma cells from normal microglial cells, causing redox alterations and oxidative stress only in the tumor. This easier-to-tolerate treatment has a potential to support the surgery and conventional therapy of glioblastoma.
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