Status epilepticus (SE) in man and rodents can produce cognitive deficits and trigger a series of molecular and cellular events that eventually culminate in the appearance of spontaneous seizures, i.e., epilepsy. An early event in this process appears to be engaged by the transcriptional repressor, REST. Our hypothesis, supported by preliminary evidence, is that REST induction by status epilepticus regulates many aspects of epileptogenesis, including neurodegeneration, cognitive impairments, neurogenesis and the development of spontaneous seizures.
Specific aims are 1) To identify the principal set of genes expressed by dentate granule cells that are directly regulated by REST after SE, and to compare the effect of conditional mutation of HDAC2 and G9a, and inhibition of class I HDACs, G9a histone methyltransferase and LSD1/SMCX histone demethylase, on their SE-induced, REST-mediated transcriptional profile. 2) To determine whether conditional mutation of REST in a subset of forebrain neurons blunts the neurodegeneration, cognitive deficits, and neurogenesis that occur after SE. 3) To compare the ability of conditional mutation of REST and (depending on the outcome of aim 1) conditional mutation or post-SE inhibition of HDAC2, G9a, and LSD1, to reduce the development of epilepsy after SE. A comparison of the pilocarpine and kainate SE models will be done to minimize model-specific conclusions. Both genetic and pharmacologic approaches will be used to pursue these aims. Strategies will involve conditional mutations of REST, HDAC2 and G9a, together with selective inhibitors of the REST epigenetic effector enzymes.

Public Health Relevance

Epilepsy acquired after head injury, status epilepticus, or other triggers can be a devastating neurologic disorder. Currently no therapies exist to prevent the development of epilepsy in someone at risk. Our work aims to examine carefully the potential involvement of one of the most likely mediators of this process. If successful our work will identify novel targets for new drug development.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS076775-03
Application #
8522323
Study Section
Clinical Neuroplasticity and Neurotransmitters Study Section (CNNT)
Program Officer
Whittemore, Vicky R
Project Start
2011-09-01
Project End
2015-08-31
Budget Start
2013-09-01
Budget End
2014-08-31
Support Year
3
Fiscal Year
2013
Total Cost
$328,040
Indirect Cost
$92,881
Name
Emory University
Department
Pharmacology
Type
Schools of Medicine
DUNS #
066469933
City
Atlanta
State
GA
Country
United States
Zip Code
30322
Jiang, Yindi; Hsieh, Jenny (2014) HDAC3 controls gap 2/mitosis progression in adult neural stem/progenitor cells by regulating CDK1 levels. Proc Natl Acad Sci U S A 111:13541-6
Dingledine, Ray; Varvel, Nicholas H; Dudek, F Edward (2014) When and how do seizures kill neurons, and is cell death relevant to epileptogenesis? Adv Exp Med Biol 813:109-22