Cancer cells in general, relative to normal cells, demonstrate increased glucose metabolism but the mechanism for this is unknown. The clinical utility of these observations has been limited to the use of 2-[F-18]-fluoro-2-deoxy-D-glucose (FDG) and Positron Emission Tomography (PET) to identify cancerous tissues. Head and neck cancers show robust signals using FDG-PET imaging that vary between patients, but the significance of the variability is unknown. Glucose metabolism leads to pyruvate and NADPH formation, which function in hydroperoxide detoxification. This has led to the proposal that cancer cells may increase glucose utilization as a compensatory mechanism protecting from intracellular hydroperoxides formed as byproducts of defects in oxidative metabolism. If tumor glucose metabolism is increased in response to excess production of hydroperoxides, inhibition of glucose and hydroperoxide metabolism should lead to oxidative stress and radiosensitization in cancer cells that is proportional to the rate of glucose utilization. The current proposal tests the hypothesis that: the extent to which human head and neck cancer cells increase their uptake and metabolism of glucose is predictive of cancer cell susceptibility to 2DG-induced radio-/chemo-sensitization and hydroperoxide-mediated oxidative stress.
Aims 1 and 2 will determine if 2DG-induced radiosensitization can be enhanced by inhibitors of hydroperoxide detoxification [i.e., buthionine sulfoximine or manipulations of glucose-6-phosphate dehydrogenase] and/or chemotherapeutic agents believed to increase oxidative stress [i.e., cisplatin and azidothymidine] in human head and neck cancer cells in vitro and in vivo.
Aim 3 will determine if enhancement of 2DG-induced radiosensitization by inhibitors of hydroperoxide detoxification and/or agents that increase oxidative stress is proportional to glucose uptake as determined by FDG-PET imaging in vitro and in vivo. The goal of this work is to provide a novel mechanism based biochemical rationale for the use of glucose metabolic differences and functional imaging to develop biologically guided combined modality therapies to treat head and neck cancer based on tumor specific sensitivity to metabolic oxidative stress.

Public Health Relevance

Increased sensitivity to glucose deprivation-induced oxidative stress in tumor vs. normal cells, has led to the hypothesis that inhibitors of glucose and hydroperoxide metabolism [i.e., 2-deoxyglucose (2DG) and buthionine sulfoximine] could be combined with therapeutic agents that increase oxidative stress (radiation, Cisplatin, and azidothymidine) to improve responses during cancer therapy. Furthermore since FDG-PET imaging can be used as a non-invasive marker of glucose metabolism, tumors with greater FDG uptake should respond better to 2-deoxyglucose-based combined modality therapies via enhancement of oxidative stress. If these hypotheses could be confirmed by the experiments in this proposal, they could provide the first mechanism based biochemical rationale for the use of glucose metabolic differences to develop biologically guided combined modality therapies to treat head and neck cancer.

National Institute of Health (NIH)
National Cancer Institute (NCI)
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Special Emphasis Panel (ZRG1-ONC-H (03))
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Wong, Rosemary S
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University of Iowa
Schools of Medicine
Iowa City
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Brandt, Kristin E; Falls, Kelly C; Schoenfeld, Joshua D et al. (2018) Augmentation of intracellular iron using iron sucrose enhances the toxicity of pharmacological ascorbate in colon cancer cells. Redox Biol 14:82-87
Zahra, Amir; Fath, Melissa A; Opat, Emyleigh et al. (2017) Consuming a Ketogenic Diet while Receiving Radiation and Chemotherapy for Locally Advanced Lung Cancer and Pancreatic Cancer: The University of Iowa Experience of Two Phase 1 Clinical Trials. Radiat Res 187:743-754
Li, Ling; Fath, Melissa A; Scarbrough, Peter M et al. (2015) Combined inhibition of glycolysis, the pentose cycle, and thioredoxin metabolism selectively increases cytotoxicity and oxidative stress in human breast and prostate cancer. Redox Biol 4:127-35
O'Leary, Brianne R; Fath, Melissa A; Bellizzi, Andrew M et al. (2015) Loss of SOD3 (EcSOD) Expression Promotes an Aggressive Phenotype in Human Pancreatic Ductal Adenocarcinoma. Clin Cancer Res 21:1741-51
Schickling, Brandon M; England, Sarah K; Aykin-Burns, Nukhet et al. (2015) BKCa channel inhibitor modulates the tumorigenic ability of hormone-independent breast cancer cells via the Wnt pathway. Oncol Rep 33:533-8
Bayer, Jennifer L; Spitz, Douglas R; Christensen, Desire et al. (2015) Biobehavioral and neuroendocrine correlates of antioxidant enzyme activity in ovarian carcinoma. Brain Behav Immun 50:58-62
Spitz, Douglas R; Hauer-Jensen, Martin (2014) Ionizing radiation-induced responses: where free radical chemistry meets redox biology and medicine. Antioxid Redox Signal 20:1407-9
Moussa, Marwan; Goldberg, S Nahum; Kumar, Gaurav et al. (2014) Radiofrequency ablation-induced upregulation of hypoxia-inducible factor-1? can be suppressed with adjuvant bortezomib or liposomal chemotherapy. J Vasc Interv Radiol 25:1972-82
Zhou, Daohong; Shao, Lijian; Spitz, Douglas R (2014) Reactive oxygen species in normal and tumor stem cells. Adv Cancer Res 122:1-67
Allen, Bryan G; Bhatia, Sudershan K; Anderson, Carryn M et al. (2014) Ketogenic diets as an adjuvant cancer therapy: History and potential mechanism. Redox Biol 2:963-70

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