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in Human Breast Cancer Cells by Histone Deacetylase Inhibition1
The Johns Hopkins Oncology Center, Johns Hopkins University, Baltimore, Maryland 21231 [X. Y., A. T. F., S. J. N., D. L. P., K. A. B., J. G. H., N. E. D.], and Section of Hematology/Oncology, University of Chicago Medical Center, Chicago, Illinois 60637 [S. M. W.]
Recent
findings have established a connection between DNA methylation and
transcriptionally inactive chromatin characterized by deacetylated
histones. Because the absence of estrogen receptor
(ER
) gene expression has been associated with
aberrant methylation of its CpG island in a significant fraction of
breast cancers, we tested whether histone deacetylase activity
contributes to the transcriptional inactivation of the methylated
ER gene in a panel of ER-negative human breast cancer
cells. Treatment of these cells with trichostatin A, a specific histone
deacetylase inhibitor, led to dose- and time-dependent re-expression of
ER mRNA as detected by reverse transcription-PCR without alteration in
ER
CpG island methylation. Trichostatin A-induced ER
re-expression was associated with increased sensitivity to DNase I at
the ER locus in MDA-MB-231 cells. These data implicate
inactive chromatin mediated by histone deacetylation as a critical
component of ER gene silencing in human breast cancer
cells. Therefore, histone deacetylation may be a potential target for
therapeutic intervention in the treatment of a subset of ER-negative
breast cancers.
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