In:
Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 30, No. 15_suppl ( 2012-05-20), p. e13545-e13545
Abstract:
e13545 Background: Our previous studies demonstrated that the human androgen receptor (AR) is an acetylated protein, and acetylation of the AR in the hinge region is essential for its ligand-dependent transactivation. The AR acetylation mimic mutant, ARK630Q, and a somatic mutation from the prostate cancer patient at the AR acetylating motif, ARK630T, showed enhanced receptor/coactivator binding and led to accelerated prostate cancer cell growth. SirT1, an NAD+-dependent class III HDAC, suppresses AR and inhibits prostate cell proliferation via deacetylation of AR. Deletion of the SirT1 gene in mice resulted in prostatic intraepithelial neoplasia (PIN) lesion formation associated with reduced autophagy. Our hypothesis is that small molecules with SirT1 activating properties could be potential novel agents for treatment of AR-expressing prostate cancer. Methods: We performed in-silico screening for small molecule antagonists of SirT1 based on computational model prediction of a known SirT1 activator, resveratrol, and identified potential activators for SirT1. The cytotoxicity of these compounds to the prostate cancer cell lines was tested by MTT assay. Results: Among the twelve compounds tested, three compounds, C5, C6 and C10, were found to inhibit AR expression in LNCaP cells and have cytotoxicity in several prostate cell lines including LNCaP, C4W2 and NeuT-transformed prostate epithelial cell line at concentration of 50 µM. Conclusions: Currently, we are testing the effects of these small molecules on the NAD+-dependent deacetylation activity of SirT1 and their effects on AR acetylation as its molecular mechanism of cell growth inhibition. The ultimate goal of this study is to develop early phase clinical trials in prostate cancer patients by blocking AR acetylation using these SirT1 activators.
Type of Medium:
Online Resource
ISSN:
0732-183X
,
1527-7755
DOI:
10.1200/jco.2012.30.15_suppl.e13545
Language:
English
Publisher:
American Society of Clinical Oncology (ASCO)
Publication Date:
2012
detail.hit.zdb_id:
2005181-5
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