Radiotherapy remains as a major component of treatment modalities for controlling tumor progression and the majority of glioblastoma multiforme (GBM) tumors recur within or at the margin of the radiation field. The unexpected biological effect of irradiation involves an altered profile of MMP-2 and MMP-9 expression and activity and provides evidence of a scenario where irradiation might promote angiogenic and invasion-related gene expression, thereby increasing invasive and angiogenic glioma cell behavior. To elucidate the interactions between radiation and MMPs in glioblastomas, we propose the following specific aims:
Specific Aim 1. Determine the effects of irradiation on MMPs/TEMPs in human endothelial and glioblastoma cells, a) Increases in MMP expression and activity during radiation therapy have potential therapeutic implications. We will determine the effects of radiation and glioblastoma-endothelial interactions on MMPs/TIMPs expression, secretion and angiogenesis in vitro in endothelial cells, b) Increased expression and activity of MMPs in irradiated tumor and endothelial cells will be modulated by antagonists and antisense RNAs of MMP-2 and MMP-9 through expression plasmids and adenoviral vectors and will be evaluated in co-cultures for the modulation of angiogenesis in vitro in endothelial cells with and without irradiation.
Specific Aim 2. Determine the effects of antisense MMP-2 and MMP-9 inhibition on glioma angiogenesis in vivo. Malignant glioma is one of the most radioresistant tumor types and tumor vascular endothelium is resilient to cytotoxic effects of ionizing radiation. In this aim, we will study the effect of a) adenoviral-mediated antisense suppression of MMP-9 expression under the control of a radiation-responsive (Erg/CMV) chimeric promoter with and without radiation treatment and b) adenoviral-mediated antisense suppression of MMP-9 expression under the control of an endothelial-specific (flt-1) promoter on tumor growth delay, microvessel density, apoptotic index and relative MMPs/TIMPs levels in tumors during tumor growth in the mouse brain. The proposed studies should generate major insights into the pathogenesis of radiation-induced alterations in GBM tumors and, in turn, demonstrate that MMPs inhibition during radiotherapy may represent a new therapeutic approach in improving the therapeutic efficacy of radiotherapy for malignant gliomas.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
1R01NS051625-01
Application #
6909534
Study Section
Special Emphasis Panel (ZRG1-CNBT (01))
Program Officer
Fountain, Jane W
Project Start
2005-02-01
Project End
2009-02-28
Budget Start
2005-02-01
Budget End
2006-02-28
Support Year
1
Fiscal Year
2005
Total Cost
$250,906
Indirect Cost
Name
University of Illinois at Chicago
Department
Other Basic Sciences
Type
Schools of Medicine
DUNS #
098987217
City
Chicago
State
IL
Country
United States
Zip Code
60612
Ezhilarasan, Ravesanker; Jadhav, Unmesh; Mohanam, Indra et al. (2009) The hemopexin domain of MMP-9 inhibits angiogenesis and retards the growth of intracranial glioblastoma xenograft in nude mice. Int J Cancer 124:306-15
Ezhilarasan, Ravesanker; Mohanam, Indra; Govindarajan, Kathiravan et al. (2007) Glioma cells suppress hypoxia-induced endothelial cell apoptosis and promote the angiogenic process. Int J Oncol 30:701-7
Jadhav, Unmesh; Ezhilarasan, Ravesanker; Vaughn, Steven F et al. (2007) Iberin induces cell cycle arrest and apoptosis in human neuroblastoma cells. Int J Mol Med 19:353-61
Jadhav, Unmesh; Mohanam, Sanjeeva (2006) Response of neuroblastoma cells to ionizing radiation: modulation of in vitro invasiveness and angiogenesis of human microvascular endothelial cells. Int J Oncol 29:1525-31
Chen, Shawei; Lee, Jin-Moo; Zeng, Chenbo et al. (2006) Amyloid beta peptide increases DP5 expression via activation of neutral sphingomyelinase and JNK in oligodendrocytes. J Neurochem 97:631-40
Xiao, Qingli; Hsu, Chung Y; Chen, Hong et al. (2005) Characterization of cis-regulatory elements of the vascular endothelial growth inhibitor gene promoter. Biochem J 388:913-20
Yin, Ke-Jie; Lee, Jin-Moo; Chen, Hong et al. (2005) Abeta25-35 alters Akt activity, resulting in Bad translocation and mitochondrial dysfunction in cerebrovascular endothelial cells. J Cereb Blood Flow Metab 25:1445-55