In order to optimize drug and oxygen delivery to solid tumors, we plan to investigate the mechanisms, which regulate tumor angiogenesis and microcirculation. This project will focus on the role of nitric oxide (NO) in tumor angiogenesis and vessel maturation. Our goal is to improve tumor blood flow and radiation response by judicious modulation of NO levels in tumors. Control of tumor blood flow has not been achieved due to the fact that tumor vessels are functionally impaired and heterogeneous with respect to diameter, length, tortuosity, and inter-capillary distance. However, transformation to a more """"""""normal"""""""" functional phenotype in tumor blood vessels by suppressing NO may realize this goal. Effects of NO on cell proliferation and migration are different in vascular endothelial cells (induction) and smooth muscle cells (inhibition). We hypothesize that NO induces angiogenesis in tumors (Aim 1), but inhibits vessel maturation (Aim 2), and thus, chronic NO inhibition """"""""normalizes"""""""" tumor vessels, making them sensitive to vasodilators. NO production will be manipulated by both pharmacological and genetic approaches. Isoform-selective NO synthase (NOS) inhibitors will clarify the relative contribution of each NOS isoform. With the use of NOS deficient mice, we will examine the contribution of host stromal cells. The tumors will include glioblastoma, melanoma, and breast carcinoma grown in orthotopic sites for primary and metastatic tumors. Intravital microscopy will allow us to monitor vessel density, diameter, tortuosity, blood flow rate, vascular permeability, and response to vasoactive agents. To study endothelial-mural cell interaction in vivo, mice expressing fluorescent protein in mural cells (alphaSMA-RFP to be developed in this project) and endothelial cells (TIE2-GFP) will be visualized by multiphoton laser-scanning microscopy. Finally, improvement of tumor oxygenation and response to radiation by a vasodilator and carbogen (O2 95 percent, CO2 5 percent) breathing after chronic NO suppression will be tested (Aim 3). The insight gained in this project will have significant implications for improving tumor treatment protocols. It will suggest a novel strategy (i.e. normalization of tumor vessels) to overcome some of the physiological barriers to the delivery of therapeutic agents to solid tumors and introduce a new paradigm to study cell-cell interaction in vivo.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA096915-02
Application #
6607130
Study Section
Radiation Study Section (RAD)
Program Officer
Stone, Helen B
Project Start
2002-07-01
Project End
2007-06-30
Budget Start
2003-07-01
Budget End
2004-06-30
Support Year
2
Fiscal Year
2003
Total Cost
$294,946
Indirect Cost
Name
Massachusetts General Hospital
Department
Type
DUNS #
073130411
City
Boston
State
MA
Country
United States
Zip Code
02199
Li, Wende; Liu, Yujiao; Yang, Weining et al. (2018) MicroRNA-378 enhances radiation response in ectopic and orthotopic implantation models of glioblastoma. J Neurooncol 136:63-71
Stylianopoulos, Triantafyllos; Munn, Lance L; Jain, Rakesh K (2018) Reengineering the Physical Microenvironment of Tumors to Improve Drug Delivery and Efficacy: From Mathematical Modeling to Bench to Bedside. Trends Cancer 4:292-319
Incio, Joao; Ligibel, Jennifer A; McManus, Daniel T et al. (2018) Obesity promotes resistance to anti-VEGF therapy in breast cancer by up-regulating IL-6 and potentially FGF-2. Sci Transl Med 10:
Carr, Jessica A; Franke, Daniel; Caram, Justin R et al. (2018) Shortwave infrared fluorescence imaging with the clinically approved near-infrared dye indocyanine green. Proc Natl Acad Sci U S A 115:4465-4470
Fukumura, Dai; Kloepper, Jonas; Amoozgar, Zohreh et al. (2018) Enhancing cancer immunotherapy using antiangiogenics: opportunities and challenges. Nat Rev Clin Oncol 15:325-340
Jung, Keehoon; Heishi, Takahiro; Khan, Omar F et al. (2017) Ly6Clo monocytes drive immunosuppression and confer resistance to anti-VEGFR2 cancer therapy. J Clin Invest 127:3039-3051
Mpekris, Fotios; Baish, James W; Stylianopoulos, Triantafyllos et al. (2017) Role of vascular normalization in benefit from metronomic chemotherapy. Proc Natl Acad Sci U S A 114:1994-1999
Mitchell, Michael J; Jain, Rakesh K; Langer, Robert (2017) Engineering and physical sciences in oncology: challenges and opportunities. Nat Rev Cancer 17:659-675
Askoxylakis, Vasileios; Badeaux, Mark; Roberge, Sylvie et al. (2017) A cerebellar window for intravital imaging of normal and disease states in mice. Nat Protoc 12:2251-2262
Kodack, David P; Askoxylakis, Vasileios; Ferraro, Gino B et al. (2017) The brain microenvironment mediates resistance in luminal breast cancer to PI3K inhibition through HER3 activation. Sci Transl Med 9:

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