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O2⋅− and H2O2-Mediated Disruption of Fe Metabolism Causes the Differential Susceptibility of NSCLC and GBM Cancer Cells to Pharmacological Ascorbate
Journal article   Open access   Peer reviewed

O2⋅− and H2O2-Mediated Disruption of Fe Metabolism Causes the Differential Susceptibility of NSCLC and GBM Cancer Cells to Pharmacological Ascorbate

Joshua D Schoenfeld, Zita A Sibenaller, Kranti A Mapuskar, Brett A Wagner, Kimberly L Cramer-Morales, Muhammad Furqan, Sonia Sandhu, Thomas L Carlisle, Mark C Smith, Taher Abu Hejleh, …
Cancer cell, Vol.31(4), pp.487-500.e8
04/10/2017
DOI: 10.1016/j.ccell.2017.02.018
PMCID: PMC6512344
PMID: 28366679
url
https://doi.org/10.1016/j.ccell.2017.02.018View
Published (Version of record) Open Access

Abstract

Pharmacological ascorbate has been proposed as a potential anti-cancer agent when combined with radiation and chemotherapy. The anti-cancer effects of ascorbate are hypothesized to involve the autoxidation of ascorbate leading to increased steady-state levels of H2O2; however, the mechanism(s) for cancer cell-selective toxicity remain unknown. The current study shows that alterations in cancer cell mitochondrial oxidative metabolism resulting in increased levels of O2⋅− and H2O2 are capable of disrupting intracellular iron metabolism, thereby selectively sensitizing non-small-cell lung cancer (NSCLC) and glioblastoma (GBM) cells to ascorbate through pro-oxidant chemistry involving redox-active labile iron and H2O2. In addition, preclinical studies and clinical trials demonstrate the feasibility, selective toxicity, tolerability, and potential efficacy of pharmacological ascorbate in GBM and NSCLC therapy. [Display omitted] •High-dose ascorbate sensitizes NSCLC and GBM cells to radio-chemotherapy•O2⋅− and H2O2 increase labile iron causing cancer cell-selective ascorbate toxicity•Therapeutic levels of ascorbate are achievable and well tolerated in GBM and NSCLC•Cancer cell oxidative metabolism can be targeted with ascorbate for cancer therapy Schoenfeld et al. show that cancer cells are selectively sensitive to ascorbate due to their altered redox-active iron metabolism. They present preclinical and clinical data demonstrating the feasibility, tolerability, and potential efficacy of pharmacological ascorbate for treating glioblastoma and non-small cell lung cancer.
Oxidative Stress non-small cell lung cancer glioblastoma multiforme ferritin labile iron metabolism superoxide dismutase hydrogen peroxide pharmacological ascorbate transferrin receptor superoxide

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