Journal article
Copper-Induced Enhancement of Glioblastoma Tumorigenicity via Cytochrome C Oxidase
Antioxidants, Vol.14(2), 142
01/24/2025
DOI: 10.3390/antiox14020142
PMCID: PMC11851629
PMID: 40002329
Abstract
Copper is an essential trace element, yet chronic copper exposure can lead to toxicity in humans, and high levels of copper have been found in the blood or tumors of patients with various forms of cancer and may affect cancer severity and response to treatment. Copper is required for the activation of cytochrome c oxidase (CcO), the mitochondrial complex that facilitates oxidative phosphorylation (OXPHOS)-mediated ATP production. We recently reported that the increased activation of CcO underlies the acquisition of treatment resistance in glioblastoma (GBM) cells. However, the potential role of copper in GBM progression or treatment resistance has not been investigated. Here, we present evidence that exposure to 20 µM copper, the maximum allowable limit for public water supplies set by the U.S. Environmental Protection Agency, promotes GBM tumor growth and reduces overall survival in vivo and increases GBM cell resistance to radiation and chemotherapy in vitro. In vitro exposure to 20 µM copper substantially increased the activity of CcO, elevated the rate and level of ATP production, and triggered a metabolic shift to an OXPHOS phenotype in GBM cells. Furthermore, copper exposure led to a substantial increase in the accumulation of glutathione and glutathione precursors in these cells. These findings establish copper as a tumor promoter in GBM and suggest that copper mediates these effects through the upregulation of CcO activity, which enhances OXPHOS metabolism and glutathione production.
Details
- Title: Subtitle
- Copper-Induced Enhancement of Glioblastoma Tumorigenicity via Cytochrome C Oxidase
- Creators
- Claudia R. Oliva - University of IowaMd Yousuf AliSusanne Flor - University of IowaCorinne E. Griguer - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Antioxidants, Vol.14(2), 142
- DOI
- 10.3390/antiox14020142
- PMID
- 40002329
- PMCID
- PMC11851629
- NLM abbreviation
- Antioxidants (Basel)
- ISSN
- 2076-3921
- eISSN
- 2076-3921
- Publisher
- MDPI
- Grant note
- National Institute for Environmental Health Sciences through the University of Iowa Environmental Health Sciences Research Center: P30 ES005605 National Institute for Environmental Health Sciences through the University of Iowa Environmental Health Sciences Research Center, NIEHS/NIH: R01NS129702 National Institute of Neurological Disorders and Stroke (NINDS) of the National Institutes of Health (NIH)
This research was funded by the National Institute for Environmental Health Sciences through the University of Iowa Environmental Health Sciences Research Center, NIEHS/NIH P30 ES005605 and the National Institute of Neurological Disorders and Stroke (NINDS) of the National Institutes of Health (NIH) under award number R01NS129702.
- Language
- English
- Date published
- 01/24/2025
- Academic Unit
- Radiation Oncology
- Record Identifier
- 9984781376802771
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