At present, there is a lack in the understanding of how antioxidants impact radioprotection. The cellular redox balance is maintained through a number of antioxidant enzymes such as heme oxygenase 1, superoxide dimutase, catalase, and glutathione. Oxidative stress and ionizing radiation activate transcriptional factors such as AP-1, NF-kB, and NRF-2 and PI-3K, PKC, and MAPK signaling cascades resulting in the induction of cellular antioxidants. Exploring the effects of ionizing radiation on antioxidant expression at the cellular level is essential before these pathways can be used to enhance radioprotection. We hypothesize that there is a hierarchal response to oxidative stress, inflammation, and cellular death in response to radiation dose. In addition to characterizing the antioxidant expression, we will explore the potential of modifying these redox responses in terms of their radioprotective effects. This project aims to improve the understanding of antioxidants in response to ionizing radiation and will clarify the importance of these mechanisms for radioprotection. ? ? ?

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Predoctoral Individual National Research Service Award (F31)
Project #
5F31CA126501-02
Application #
7295970
Study Section
Special Emphasis Panel (ZRG1-EMNR-E (29))
Program Officer
Bini, Alessandra M
Project Start
2006-09-30
Project End
2009-09-29
Budget Start
2007-09-30
Budget End
2008-09-29
Support Year
2
Fiscal Year
2007
Total Cost
$30,102
Indirect Cost
Name
University of California Los Angeles
Department
Radiation-Diagnostic/Oncology
Type
Schools of Medicine
DUNS #
092530369
City
Los Angeles
State
CA
Country
United States
Zip Code
90095
McDonald, J Tyson; Kim, Kwanghee; Norris, Andrew J et al. (2010) Ionizing radiation activates the Nrf2 antioxidant response. Cancer Res 70:8886-95