Primary brain tumors, gliomas, have thus far evaded effective treatment making them a tremendous challenge clinically. This is in part due to the unusual ability of gliomas to infiltrate surrounding brain making surgical resection difficult. Tumor cells can move through the brain parenchyma, following white matter tracts or along blood vessels. Ultimately many glioma cells associate with blood vessels, presumably to gain enhanced access to nutrients. In a recent study, we show that glioma cells are attracted to cerebral vessels by responding to bradykinin which is produced by vascular endothelial cells. Once associated with blood vessels, glioma cells co-opt the vasculature and eventually induce vessel sprouting and angiogenesis. Understanding how gliomas alter the physiology of the existing cerebral vasculature is the primary objective of this grant. We hypothesize that the vascular association provides an intrinsic advantage and that gliomas actively regulate the behavior of the associated blood vessel. More specifically we hypothesize that (1) vessel associated glioma cells displace astrocytic endfeet from the blood vessels;(2) this disrupts normal astrocyte-vascular coupling as astrocyte-derived vasoactive molecules fail to reach vascular smooth muscle cells;(3) displacement of astrocytic endfeet leads to a breakdown of the blood-brain barrier;and (4) once attached to vessels, glioma cells actively regulate vascular tone through the release of vasoactive compounds. These hypotheses will be tested using a clinically relevant animal model of glioma employing a combination of single- and multi-photon imaging studies in situ and in vivo. These studies have the potential to elucidate novel ways to interfere with the destructive biology of these deadly tumors in the future.

Public Health Relevance

We are investigating whether primary brain tumors that associate with blood vessels disrupt the normal interactions between astrocytes, vascular endothelial and smooth muscle cells and how this may disrupt normal blood flow and breach the blood brain barrier.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
1R01NS082851-01A1
Application #
8630567
Study Section
Cellular and Molecular Biology of Glia Study Section (CMBG)
Program Officer
Fountain, Jane W
Project Start
2013-09-30
Project End
2017-08-31
Budget Start
2013-09-30
Budget End
2014-08-31
Support Year
1
Fiscal Year
2013
Total Cost
$321,563
Indirect Cost
$102,813
Name
University of Alabama Birmingham
Department
Neurosciences
Type
Schools of Medicine
DUNS #
063690705
City
Birmingham
State
AL
Country
United States
Zip Code
35294
Tewari, Bhanu P; Chaunsali, Lata; Campbell, Susan L et al. (2018) Perineuronal nets decrease membrane capacitance of peritumoral fast spiking interneurons in a model of epilepsy. Nat Commun 9:4724
Haring, Alexander P; Sontheimer, Harald; Johnson, Blake N (2017) Microphysiological Human Brain and Neural Systems-on-a-Chip: Potential Alternatives to Small Animal Models and Emerging Platforms for Drug Discovery and Personalized Medicine. Stem Cell Rev 13:381-406
Robel, Stefanie; Sontheimer, Harald (2016) Glia as drivers of abnormal neuronal activity. Nat Neurosci 19:28-33
Thompson, Emily G; Sontheimer, Harald (2016) A role for ion channels in perivascular glioma invasion. Eur Biophys J 45:635-648
Thompson, Emily G; Sontheimer, Harald (2015) A frightening thought: Neuronal activity enhances tumor growth. Cell Res 25:891-2
Kimbrough, Ian F; Robel, Stefanie; Roberson, Erik D et al. (2015) Vascular amyloidosis impairs the gliovascular unit in a mouse model of Alzheimer's disease. Brain 138:3716-33
Robert, Stephanie M; Buckingham, Susan C; Campbell, Susan L et al. (2015) SLC7A11 expression is associated with seizures and predicts poor survival in patients with malignant glioma. Sci Transl Med 7:289ra86
Sontheimer, Harald (2015) Brain cancer: Tumour cells on neighbourhood watch. Nature 528:49-50
Robel, Stefanie; Buckingham, Susan C; Boni, Jessica L et al. (2015) Reactive astrogliosis causes the development of spontaneous seizures. J Neurosci 35:3330-45
Cuddapah, Vishnu Anand; Robel, Stefanie; Watkins, Stacey et al. (2014) A neurocentric perspective on glioma invasion. Nat Rev Neurosci 15:455-65

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