The tumor suppressor p53 is recognized as an important regulator of apoptosis in acute and chronic neurological insults and neurodegenerative disorders. However, the downstream molecular consequences of p53 activation in neurons still remain obscure. Our proteomic analyses have demonstrated that DNA damage-induced neuronal apoptosis involves a p53-dependent increase in the expression of proteins that comprise histone deacetylase (HDAC) complexes. This data suggests that p53 might promote neuronal dysfunction/cell death by activating histone deacetylase activity. Our preliminary studies indeed demonstrate that histone deacetylase inhibitors protect against p53-mediated cell death. In contrast HDAC activity is generally elevated in cancer cells, and HDAC inhibition actually induces p53-dependent cell death. In the present application, based on this novel finding of the neuron-specific mode of HDAC inhibitor actions, we propose to test the hypothesis that p53-mediated cell death signaling in neurons is dependent on histone deacetylase activity by examining how HDAC inhibitors block neuronal cell death. We will specifically: 1) Determine if HDAC inhibitors selectively protect neurons from p53-mediated cell death, 2) Determine if HDAC inhibitors directly block p53 activation and/or transcriptional activity required for p53-dependent cell death in neurons; and 3) Determine if HDAC inhibitors prevent p53- dependent changes in mitochondrial integrity.
The aims of this proposal will help us to better understand the molecular sites and mechanism of HDAC inhibitor action, which will enhance the utility of these inhibitors as therapeutic agents for neurological diseases and injury. ?

Public Health Relevance

Histone deacetylase inhibitors protect neurons from dying in several mouse models of human neurodegenerative disease. However, the mechanism by which histone deacetylase inhibitors prevent cell death is not understood. A better understanding of how these compounds work and the types of diseases or injuries that they protect against would enhance their range of action and their effectiveness. We propose to determine how histone deacetylase inhibitors block neuronal cell death which could lead to the development of new therapeutic agents for treating neurological diseases and nervous system injury. ? ?

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
1R01NS056031-01A2
Application #
7461900
Study Section
Neural Oxidative Metabolism and Death Study Section (NOMD)
Program Officer
Sutherland, Margaret L
Project Start
2008-03-01
Project End
2013-02-28
Budget Start
2008-03-01
Budget End
2009-02-28
Support Year
1
Fiscal Year
2008
Total Cost
$341,250
Indirect Cost
Name
University of Washington
Department
Neurosurgery
Type
Schools of Medicine
DUNS #
605799469
City
Seattle
State
WA
Country
United States
Zip Code
98195
Wang, David B; Kinoshita, Chizuru; Kinoshita, Yoshito et al. (2018) Neuronal susceptibility to beta-amyloid toxicity and ischemic injury involves histone deacetylase-2 regulation of endophilin-B1. Brain Pathol :
Wang, David B; Kinoshita, Yoshito; Kinoshita, Chizuru et al. (2015) Loss of endophilin-B1 exacerbates Alzheimer's disease pathology. Brain 138:2005-19
Murphy, Sean P; Lee, Rona J; McClean, Megan E et al. (2014) MS-275, a class I histone deacetylase inhibitor, protects the p53-deficient mouse against ischemic injury. J Neurochem 129:509-15
Wang, David B; Kinoshita, Chizuru; Kinoshita, Yoshito et al. (2014) p53 and mitochondrial function in neurons. Biochim Biophys Acta 1842:1186-97
Wang, David B; Uo, Takuma; Kinoshita, Chizuru et al. (2014) Bax interacting factor-1 promotes survival and mitochondrial elongation in neurons. J Neurosci 34:2674-83
Wang, David B; Garden, Gwenn A; Kinoshita, Chizuru et al. (2013) Declines in Drp1 and parkin expression underlie DNA damage-induced changes in mitochondrial length and neuronal death. J Neurosci 33:1357-65
Baltan, Selva; Murphy, Sean P; Danilov, Camelia A et al. (2011) Histone deacetylase inhibitors preserve white matter structure and function during ischemia by conserving ATP and reducing excitotoxicity. J Neurosci 31:3990-9
Jayadev, Suman; Case, Amanda; Eastman, Alison J et al. (2010) Presenilin 2 is the predominant ?-secretase in microglia and modulates cytokine release. PLoS One 5:e15743
Baltan, Selva; Inman, Denise M; Danilov, Camelia A et al. (2010) Metabolic vulnerability disposes retinal ganglion cell axons to dysfunction in a model of glaucomatous degeneration. J Neurosci 30:5644-52
Uo, Takuma; Dworzak, Jenny; Kinoshita, Chizuru et al. (2009) Drp1 levels constitutively regulate mitochondrial dynamics and cell survival in cortical neurons. Exp Neurol 218:274-85

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