The major goals of this project have been to advance genetic and molecular based knowledge of hypoxia induced gene and protein regulation to understand tumor progression and develop more targeted therapeutics for solid tumors. The four projects and two cores that comprise this grant explore how to protect normal tissues to increase the efficacy of hypofractionated and fractionated radiotherapy, and how to specifically increase tumor radiosensitivity by manipulating mitochondrial metabolism and the unfolded protein response pathways. These projects represent a highly integrated effort to translate our understanding of the biology of hypoxia and metabolism to enhance the efficacy of radiotherapy. The first two projects, Project 1 (Project Leader: Giaccia) and Project 2 (Project Leader: Le), wil attempt to mitigate the effects of radiation on the Gl tract and submandibular glands through the exploitation of the PHD/VHL/HIF pathway and metabolic activation of aldehyde dehydrogenase (ALDH3A2). During the last grant period, Project 1 (Project Leader: Giaccia) was focused on the role of CTGF and Lysyl Oxidase in pancreatic growth and metastasis. This project has been quite successful and resulted in a Phase I clinical trial for anti-CTGF in pancreatic cancer. Similarly, Project 2 (Project Leader: Le) has focused her project on using activation of ALDH3A2 to protect and mitigate radiation-induced toxicity to the submandibular gland. This is a new direction from the last submission where she was highly productive in understanding the role of hypoxia induced Osteopontin (OPN) on tumor growth and metastasis. Project 3 (Project Leader: Denko) and Project 4 (Project Leader: Koong) are continuations of the projects from the last grant period and will investigate how manipulating mitochondrial activity and the UPR pathway will increase radiosensitivity and work cooperatively with radiotherapy to control tumor growth, respectively. Both of these projects are also highly translational and have had significant achievements during the last funding cycle. In the competitive renewal, Project 3 will investigate whether correcting the oxygen supply and demand mismatch through the use of papaverine will increase tumor oxygenation and radiosensitivity. If successful, this molecule, which has already been approved clinically as anti-spasmodic, could rapidly enter clinical trial. Project 4 identifie new inhibitors of the IRE1 endonuclease, which controls one branch of the unfolded protein response, and sensitizes hypoxic cells to radiation. The overall hypothesis to be tested in this PPG is whether manipulating hypoxia response pathways will result in increased tumor control and normal tissue protection.

Public Health Relevance

The concept of therapeutic index has two components: the tumor component and the normal tissue component. However, manipulation of either part of this equation can increase the therapeutic index. This program project grant is focused on increasing the therapeutic index of radiotherapy by reducing radiation induced normal tissue toxicity (Projects 1 and 2) and increasing tumor radiosensitivity (Projects 3 and 4).

National Institute of Health (NIH)
National Cancer Institute (NCI)
Research Program Projects (P01)
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Special Emphasis Panel (ZCA1-RPRB-2 (J1))
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Bernhard, Eric J
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Stanford University
Schools of Medicine
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Rankin, Erinn B; Fuh, Katherine C; Castellini, Laura et al. (2014) Direct regulation of GAS6/AXL signaling by HIF promotes renal metastasis through SRC and MET. Proc Natl Acad Sci U S A 111:13373-8
Kariolis, Mihalis S; Miao, Yu Rebecca; Jones 2nd, Douglas S et al. (2014) An engineered Axl 'decoy receptor' effectively silences the Gas6-Axl signaling axis. Nat Chem Biol 10:977-83
Taniguchi, Cullen M; Miao, Yu Rebecca; Diep, Anh N et al. (2014) PHD inhibition mitigates and protects against radiation-induced gastrointestinal toxicity via HIF2. Sci Transl Med 6:236ra64
Xiao, Nan; Lin, Yuan; Cao, Hongbin et al. (2014) Neurotrophic factor GDNF promotes survival of salivary stem cells. J Clin Invest 124:3364-77
Sun, Ramon C; Denko, Nicholas C (2014) Hypoxic regulation of glutamine metabolism through HIF1 and SIAH2 supports lipid synthesis that is necessary for tumor growth. Cell Metab 19:285-92
Giaccia, Amato J (2014) Molecular radiobiology: the state of the art. J Clin Oncol 32:2871-8
Finger, E C; Cheng, C-F; Williams, T R et al. (2014) CTGF is a therapeutic target for metastatic melanoma. Oncogene 33:1093-100
Kuo, Peiwen; Bratman, Scott V; Shultz, David B et al. (2014) Galectin-1 mediates radiation-related lymphopenia and attenuates NSCLC radiation response. Clin Cancer Res 20:5558-69
Vilalta, Marta; Rafat, Marjan; Giaccia, Amato J et al. (2014) Recruitment of circulating breast cancer cells is stimulated by radiotherapy. Cell Rep 8:402-9
Razorenova, Olga V; Castellini, Laura; Colavitti, Renata et al. (2014) The apoptosis repressor with a CARD domain (ARC) gene is a direct hypoxia-inducible factor 1 target gene and promotes survival and proliferation of VHL-deficient renal cancer cells. Mol Cell Biol 34:739-51

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