Over the course of the last several years, we have found that vairous redox related species such as nitric oxide play a major role in the promotion of angiogenesis as well as part of the inflammatory response. A recent study has shown that NO regulates a number of proteins such as TSP-1, TGF beta, metallo matrix proteases (MMP), TIMP, HIF-1alpha, Akt, ERK and p53. We have found a correlation been Akt and Nitric oxide synthase in breast cancer patients. We have begun to correlate our molecular studies in vitro with patient slides. These have begun to provide us insight into the role this small diatomic radical associated with oxidative stress plays in cancer. One of the important extension of our MMP and TIMP-1 work is that we have found that changes in TIMP-1 have major effects in both Alzhiemer?s disease (AD) and Breast cancer. In breast cancer, we found that TIMP-1 predicts poor outcome and increases the association of iNOS with Akt-P. Using in vitro studies we find that TIMP-1 nitration leads to increase binding to CD63 on the tumor cell and increase Src and PI3K activity. In contrast, we find in AD that TIMP1 regulation by NO in the microglia is important for increase MMP9 activity and clearance of the plaque. This contrary behavior in these diseases indicates the importance of knowing the cell type and the molecular and chemical biological mechanism of the disease form which platform can be built to identify new markers and therapies. In animal models, we have found NOS inhibitors can induce a tumor re-growth delay after radiation thus improving the efficacy of these treatments. In collaboration with Dr. Wiltrout, Young and Trincheri we have found that nitric oxide modification after ionizing radiation mediates strong immune response that either polarizes the immune system in a Th1 or Th2 manner. Though NOS inhibition is thought to be associated only with angiogenesis, we have found that this is a minor event. In fact, modulation of nitric oxide and other redox inflammation leads to increase Th1 cytokines such as IL-2 and IL-12 leading to an improve response. These new finding make it possible to generate these Th1 cytokines in situ thereby avoiding systemic administration.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Investigator-Initiated Intramural Research Projects (ZIA)
Project #
1ZIABC010898-06
Application #
8763268
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
6
Fiscal Year
2013
Total Cost
$402,444
Indirect Cost
Name
National Cancer Institute Division of Basic Sciences
Department
Type
DUNS #
City
State
Country
Zip Code
Miller, Thomas W; Soto-Pantoja, David R; Schwartz, Anthony L et al. (2015) CD47 Receptor Globally Regulates Metabolic Pathways That Control Resistance to Ionizing Radiation. J Biol Chem 290:24858-74
Ridnour, Lisa A; Cheng, Robert Y S; Weiss, Jonathan M et al. (2015) NOS Inhibition Modulates Immune Polarization and Improves Radiation-Induced Tumor Growth Delay. Cancer Res 75:2788-99
Ridnour, Lisa A; Cheng, Robert Y S; Switzer, Christopher H et al. (2013) Molecular pathways: toll-like receptors in the tumor microenvironment--poor prognosis or new therapeutic opportunity. Clin Cancer Res 19:1340-6
Soto-Pantoja, David R; Ridnour, Lisa A; Wink, David A et al. (2013) Blockade of CD47 increases survival of mice exposed to lethal total body irradiation. Sci Rep 3:1038
Schoenfeld, Michael P; Ansari, Rafat R; Nakao, Atsunori et al. (2012) A hypothesis on biological protection from space radiation through the use of new therapeutic gases as medical counter measures. Med Gas Res 2:8
Ridnour, Lisa A; Barasch, Kimberly M; Windhausen, Alisha N et al. (2012) Nitric oxide synthase and breast cancer: role of TIMP-1 in NO-mediated Akt activation. PLoS One 7:e44081
Ridnour, Lisa A; Dhanapal, Sneha; Hoos, Michael et al. (2012) Nitric oxide-mediated regulation of β-amyloid clearance via alterations of MMP-9/TIMP-1. J Neurochem 123:736-49
Soto-Pantoja, David R; Miller, Thomas W; Pendrak, Michael L et al. (2012) CD47 deficiency confers cell and tissue radioprotection by activation of autophagy. Autophagy 8:1628-42
Schoenfeld, Michael P; Ansari, Rafat R; Zakrajsek, June F et al. (2011) Hydrogen therapy may reduce the risks related to radiation-induced oxidative stress in space flight. Med Hypotheses 76:117-8
Wilcock, Donna M; Morgan, Dave; Gordon, Marcia N et al. (2011) Activation of matrix metalloproteinases following anti-Aβ immunotherapy; implications for microhemorrhage occurrence. J Neuroinflammation 8:115

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