The normal functioning of the adult nervous system relies critically on the proper structure and function of the vascular system. Blood vessels provide neurons with oxygen and nutrients and protect them from toxins and pathogens. Nerves, in turn, control blood vessel dilation and contraction and also heart rate. Key to this functional interdependence is an extraordinarily tight physical association between nervous and vascular systems. In the periphery, nerves and vessels often run parallel to one another and in the central nervous system neural activity and vascular dynamics are tightly coupled. Indeed, emerging evidence shows that some neurodegenerative diseases, such as Alzheimer's disease (AD), amyotrophic lateral sclerosis (ALS), and multiple sclerosis (MS), once thought to be caused by intrinsic neuronal defects, are in fact initiated and perpetuated by vascular abnormalities. Despite these important connections between the nervous and vascular systems, little is known about how the nervous system becomes so closely aligned with the vascular system during development. In this proposal, we have established a simple system using developing mouse somatosensory peripheral target innervation as a model to study this question.
In Aim1, we will dissect the molecular mechanisms underlying the organization of the tight nerve/vessel association, particularly focusing on the role of a recently identified ligand-receptor pair, Sema3E-Pelxin-D1. We will apply both in vitro assays and in vivo mouse genetics approaches to address the function of Sema3E-Pelxin-D1 signaling in establishing the nerve/vessel association.
In Aim 2, we will identify and characterize the intracellular signaling mechanisms downstream of Sema3E-Pelxin-D1 in neurons and endothelial cells. Using a novel image-based RNAi genome-wide screen, we have identified and validated several potential candidates mediate Sema3E-Plexin-D1 signaling. We will characterize their roles in Sema3E-Plexin-D1 signaling and compare whether similar signaling mechanisms are used in Sema3E -mediated axon guidance and endothelial cell migration. Together, these proposed experiments will uncover cellular and molecular mechanisms underlying neuro-vascular interactions. These results may also improve our ability to diagnose, treat, and prevent neurological disorders that affect both neurons and vessels, including: peripheral neuropathies, Alzheimer's Disease (AD), amyotrophic lateral sclerosis (ALS), and multiple sclerosis (MS).

Public Health Relevance

Understanding the interactions between vascular and nervous systems will advance the diagnosis, therapy, and prevention of several neurological diseases, including diabetic neuropathy and trigeminal neuralgia. Moreover, emerging evidence shows some neurodegenerative diseases, such as Alzheimer's disease, amyotrophic lateral sclerosis (ALS), and multiple sclerosis (MS), that once were thought to be caused primarily by intrinsic neuronal defects, actually may be related to vascular abnormalities. Finally, since mechanisms that control angiogenesis during development are likely to be essential for neovascularization in tumors, this study may have a direct impact on cancer treatment.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS064583-02
Application #
8015983
Study Section
Neurodifferentiation, Plasticity, and Regeneration Study Section (NDPR)
Program Officer
Riddle, Robert D
Project Start
2010-02-01
Project End
2015-01-31
Budget Start
2011-02-01
Budget End
2012-01-31
Support Year
2
Fiscal Year
2011
Total Cost
$363,366
Indirect Cost
Name
Harvard University
Department
Biology
Type
Schools of Medicine
DUNS #
047006379
City
Boston
State
MA
Country
United States
Zip Code
02115
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Keskin, Doruk; Kim, Jiha; Cooke, Vesselina G et al. (2015) Targeting vascular pericytes in hypoxic tumors increases lung metastasis via angiopoietin-2. Cell Rep 10:1066-81
Chow, Brian Wai; Gu, Chenghua (2015) The molecular constituents of the blood-brain barrier. Trends Neurosci 38:598-608
Lacoste, Baptiste; Gu, Chenghua (2015) Control of cerebrovascular patterning by neural activity during postnatal development. Mech Dev 138 Pt 1:43-9
Ben-Zvi, Ayal; Lacoste, Baptiste; Kur, Esther et al. (2014) Mfsd2a is critical for the formation and function of the blood-brain barrier. Nature 509:507-11
Lacoste, Baptiste; Comin, Cesar H; Ben-Zvi, Ayal et al. (2014) Sensory-related neural activity regulates the structure of vascular networks in the cerebral cortex. Neuron 83:1117-30
Gelfand, Maria V; Hagan, Nellwyn; Tata, Aleksandra et al. (2014) Neuropilin-1 functions as a VEGFR2 co-receptor to guide developmental angiogenesis independent of ligand binding. Elife 3:e03720
Tritsch, Nicolas X; Oh, Won-Jong; Gu, Chenghua et al. (2014) Midbrain dopamine neurons sustain inhibitory transmission using plasma membrane uptake of GABA, not synthesis. Elife 3:e01936
Oh, Won-Jong; Gu, Chenghua (2013) The role and mechanism-of-action of Sema3E and Plexin-D1 in vascular and neural development. Semin Cell Dev Biol 24:156-62

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