This application seeks to advance the therapeutic development of a new class of histone deacetylase (HDAC) inhibitors through a performance-screening paradigm, consisting of cell culture, Drosophila and mouse models of Huntington's disease (HD). Clinical candidate testing will include full pre-clinical assessment leading to submission of an Investigational New Drug application to the US FDA. We have identified a novel HDAC inhibitor chemical scaffold (pimelic diphenylamides) that is efficacious in reversing disease phenotype in the R6/2 mouse model for HD, while showing no acute or chronic toxic effects. We have on hand a library of derivatives of this molecule, and in this proposal, we seek to (1) perform a structure-activity relationship screen to identify HDAC inhibitors that reverse gene expression changes and alter histone acetylation in polyQ containing striatal cells as a cellular model for HD;screen our HDAC inhibitor library in a Drosophila model for polyQ expansion to determine in vivo potency in reversing neurodegeneration, and to determine the relationship between HDAC enzyme specificity and in vivo activity;to characterize the in vivo pharmacology properties of HD-active compounds in rodents. (2) Test the top candidate molecules identified in cell and Drosophila screens in R6/2 HD transgenic mice;(3) Create a HD-targeted library of compounds to optimize safety, pharmacology and potency in anticipation of developing long-term oral dose treatments. Compounds will be assessed for HDAC inhibition activity and potency in the cell-based and Drosophila models and in vivo pharmacology;test the top 5 compounds identified above in the R6/2 mouse model, and test the two best compounds in the YAC128 mouse model of HD, which expresses full-length mutant huntingtin protein to reduce potential for animal model bias in surrogate efficacy. (4) Pilot toxicity and safety profiles will be determined with the top two compounds in rodents and non-rodents to help choose the final clinical candidate;methods for production of clinical grade drug product will be developed;and, an IND enabling package of pharmacology, safety and toxicology to guide human testing will be completed.

Public Health Relevance

We recently identified a class of small molecules called histone deacetylase (HDAC) inhibitors that prevent neurodegeneration in a mouse model for Huntington's disease (HD), without toxicity problems that have been encountered with other types of HDAC inhibitors in other studies. In this application we seek to explore these HDAC inhibitors as potential therapeutics for HD.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project--Cooperative Agreements (U01)
Project #
3U01NS063953-01A2S1
Application #
8247872
Study Section
National Institute of Neurological Disorders and Stroke Initial Review Group (NSD)
Program Officer
Sutherland, Margaret L
Project Start
2010-06-15
Project End
2014-05-31
Budget Start
2010-06-15
Budget End
2011-05-31
Support Year
1
Fiscal Year
2011
Total Cost
$32,001
Indirect Cost
Name
Scripps Research Institute
Department
Type
DUNS #
781613492
City
La Jolla
State
CA
Country
United States
Zip Code
92037
Thomas, Elizabeth A (2016) DNA methylation in Huntington's disease: Implications for transgenerational effects. Neurosci Lett 625:34-9
Jia, Haiqun; Wang, Ying; Morris, Charles D et al. (2016) The Effects of Pharmacological Inhibition of Histone Deacetylase 3 (HDAC3) in Huntington's Disease Mice. PLoS One 11:e0152498
Jia, Haiqun; Morris, Charles D; Williams, Roy M et al. (2015) HDAC inhibition imparts beneficial transgenerational effects in Huntington's disease mice via altered DNA and histone methylation. Proc Natl Acad Sci U S A 112:E56-64
Vashishtha, Malini; Ng, Christopher W; Yildirim, Ferah et al. (2013) Targeting H3K4 trimethylation in Huntington disease. Proc Natl Acad Sci U S A 110:E3027-36
Schmidt, Heath D; McGinty, Jacqueline F; West, Anne E et al. (2013) Epigenetics and psychostimulant addiction. Cold Spring Harb Perspect Med 3:a012047
O'Rourke, Jacqueline Gire; Gareau, Jaclyn R; Ochaba, Joseph et al. (2013) SUMO-2 and PIAS1 modulate insoluble mutant huntingtin protein accumulation. Cell Rep 4:362-75
Jia, Haiqun; Kast, Ryan J; Steffan, Joan S et al. (2012) Selective histone deacetylase (HDAC) inhibition imparts beneficial effects in Huntington's disease mice: implications for the ubiquitin-proteasomal and autophagy systems. Hum Mol Genet 21:5280-93
Jia, Haiqun; Pallos, Judit; Jacques, Vincent et al. (2012) Histone deacetylase (HDAC) inhibitors targeting HDAC3 and HDAC1 ameliorate polyglutamine-elicited phenotypes in model systems of Huntington's disease. Neurobiol Dis 46:351-61