
[Cancer Research 61, 931-934, February 1, 2001]
© 2001 American Association for Cancer Research
MS-275, A Histone Deacetylase Inhibitor, Selectively Induces Transforming Growth Factor ß Type II Receptor Expression in Human Breast Cancer Cells
Byoung Ick Lee1,
Seok Hee Park1,
Jin Woo Kim,
Edward A. Sausville,
Heung Tae Kim,
Osamu Nakanishi,
Jane B. Trepel and
Seong-Jin Kim2
Laboratory of Cell Regulation and Carcinogenesis [B. I. L., S. H. P., H. T. K., S-J. K.], Developmental Therapeutics Program [E. A. S.], and the Medicine Branch [J. W. K., J. B. T.], National Cancer Institute, Bethesda, Maryland 20892, and Mitsui Pharmaceuticals, Chiba 297-0017, Japan [O. N.]
 |
ABSTRACT
|
|---|
Transcriptional repression of the transforming growth factor (TGF)-ß
type II receptor (TßRII) gene
appears to be a major mechanism to inactivate TGF-ß responsiveness in
many human cancers. Because histone acetylation/deacetylation plays a
role in transcriptional regulation, we have examined the effect of
MS-275, a synthetic inhibitor of histone deacetylase, in human breast
cancer cell lines. MS-275 showed antiproliferative activity against all
human breast cancer cell lines examined and induced TßRII mRNA, but
not TGF-ß type I receptor mRNA. MS-275 caused an accumulation of
acetylated histones H3 and H4 in total cellular chromatin. An increase
in the accumulation of acetylated histones H3 and H4 was detected in
the TßRII promoter after treatment with MS-275. However, the level of
histone acetylation did not change in chromatin associated with the
TGF-ß type I receptor gene. MS-275 treatment enhanced
TGF-ß1-induced plasminogen activator inhibitor 1 expression. Thus,
antitumor activity of MS-275 may be mediated in part through the
induction of TßRII expression and consequent potentiation
of TGF-ß signaling.
 |
Introduction
|
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Alterations in chromatin structure by histone modification appear
to play a central role in the regulation of gene transcription.
Acetylation of core nucleosomal histones is regulated by the opposing
activities of histone acetyltransferases and
HDACs3
(1, 2, 3)
. HDACs catalyze the removal of an acetyl group from
the
-amino group of lysine side chains of histone H2A, H2B, H3, and
H4 and thereby reconstitute the positive charge on lysine. Inhibitors
of HDACs have been shown to induce differentiation and/or apoptosis of
transformed cells, suggesting that alterations in chromatin structure
may also be important in the process of neoplasia (1
, 2)
.
HDAC inhibitors such as sodium butyrate, suberoylanilide hydroxamic
acid, and trichostatin A appear to arrest human tumor cells at
G1 and G2-M phase and
induce expression of the cell cycle kinase inhibitor
p21WAF1 (4, 5, 6, 7, 8)
. Increased expression
of p21WAF1 may be one of the critical factors in
the growth arrest induced in transformed cells by these agents.
TGF-ß, the prototypic multifunctional cytokine, participates in the
regulation of vital cellular activities such as proliferation and
differentiation (9
, 10)
. Another essential function of
TGF-ß is its tumor suppressor activity in a variety of different
human cell types. Human cancer cells frequently demonstrate resistance
to the normal growth-inhibitory effects of TGF-ß, and it has been
proposed that the development of such TGF-ß resistance represents a
significant step during carcinogenesis (11, 12, 13)
. Many
human cancer cell lines including breast and prostate cancer cell lines
have TGF-ß resistance without detectable alterations in the
TßRII gene (13)
. These cells
express low or undetectable levels of TßRI and
TßRII genes, suggesting that abnormalities of
transcriptional regulation, altered mRNA processing, or decreased mRNA
stability might be involved.
In this study, we have examined the effect of a synthetic inhibitor of
HDAC, MS-275, on the growth of human breast cancer cells and expression
of TßRII (14)
. We found that MS-275 induces
the accumulation of acetylated histones in the chromatin of the
TßRII gene and that this increase is associated
with an increase in TßRII expression in human breast
cancer cell lines. In addition, MS-275 treatment enhanced
TGF-ß1-induced PAI-1 expression. These findings indicate that the
growth inhibition of human breast cancer cells by MS-275 may be due, at
least in part, to the restoration of TGF-ß signaling by inducing
TßRII.
 |
Materials and Methods
|
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Cell Culture.
The human breast cancer cell lines MCF-7, ZR-75, HS-578t, and SKBR3
were cultured in RPMI 1640 without phenol red with 10%
charcoal-treated fetal bovine serum and incubated at 37°C with 5%
CO2.
N-(2-Aminophenyl)-4-[N-(pyridine-3-yl-methoxy-carbonyl)aminomethyl]benzamide
(MS-275), an inhibitor of HDAC, was kindly provided by Mitsui
Pharmaceuticals (Chiba, Japan; Ref. 14
).
Northern Blot Analysis.
Total RNA was isolated using Trizol (Life Technologies, Inc.,
Rockville, MD) according to the manufacturers instructions,
transferred onto Zeta-Probe blotting membrane (Bio-Rad Laboratories,
Hercules, CA), and hybridized with 32P-labeled
cDNA for human TßRII, TßRI, PAI-1, or ß-actin.
Acid-soluble Nuclear Protein Preparation and Western Blot
Analysis.
Acid-soluble proteins were prepared as described previously (8
, 15)
. Cells (5 x 106) were
cultured with and without MS-275 (0.5 µM). Protein
concentrations of histone preparations were determined using the
Bio-Rad Protein Assay Kit with BSA as the standard. Proteins (20 µg
protein) were denatured and electrophoresed in 15% polyacrylamide gels
for histones. After electrophoresis, samples were transferred onto
nitrocellulose. To verify equal protein loading, a parallel protein gel
was run and stained with Coomassie Blue. The blots were probed with
rabbit antiacetylated histone H3 and rabbit antiacetylated histone H4
(Upstate Biotechnology, Lake Placid, NY) and detected by using the
enhanced chemiluminescence method (Pierce).
ChIP Assay.
Cells were plated at a density of 5 x 106 cells/15-cm dish and incubated overnight. The
next day, cells were cultured with 0 or 1 µM MS-275 for
24 h. ChIP assay was performed using the method described by
Richon et al. (8)
. TßRI- and TßRII-specific
primers were used to carry out PCR from DNA isolated from ChIP
experiments and Input samples. The optimal reaction conditions for PCR
were determined for each primer pair. Parameters were denaturation at
95°C for 1 min and annealing at 58°C for 1 min, followed by
elongation at 72°C for 1 min. PCR products were analyzed by 2.5%
agarose/ethidium bromide gel electrophoresis. The primers of the TßRI
promoter (16)
for ChIP analysis were
5'-GTGGGGCGTGGCCAGAAAC-3' (-26/-44; uP1) and
5'-GCCCTTTGTAACTGCTCGGAGGAC-3' (+102/+125; dP2). The primers of the
TßRII promoter (17)
were 5'-CTGGTCTAGGAAACATGATTGG-3'
(-77/-98; uP1) and 5'-CGAGTGACTCACTCAACTTCAACTCAG-3' (+54/+33; dP2).
 |
Results
|
|---|
MS-275 Inhibits Proliferation of Human Breast Cancer Cells and
Induces Accumulation of Acetylated Histones.
We examined the effect of the HDAC inhibitor MS-275 on the
proliferation of human breast cancer cells. Cells were cultured with
and without 1 µM MS-275 for 15 days. MS-275 inhibited
proliferation at 1 µM over the duration of culture (Fig. 1a)
. MS-275 at 1 µM inhibited the
proliferation of HS-578t cells without loss of cell viability (>95%
viable) as determined by trypan blue exclusion, whereas MS-275 at 1
µM caused a 50% loss of cell viability in
MCF-7, ZR-75, and SKBR3 cells after 3 days. When the concentration of
MS-275 was decreased to a nontoxic dose of 0.5, 0.25, and 0.5
µM in MCF-7, ZR-75, and SKBR3, respectively, no
increase in cell density was detected over the duration of culture
(Fig. 1, bd)
.

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Fig. 1. Antiproliferative effect of MS-275. Cells were incubated
with the indicated concentrations of MS-275 for 5 subsequent days in
triplicate. Each day, cells were trypsinized and counted. *,
P < 0.01. a, HS-578t
incubated with 1 µM MS-275; b, MCF-7
incubated with 0.5 µM MS-275;
c, ZR-75 incubated with 0.25 µM
MS-275; d, SKBR3 incubated with 0.5
µM MS-275.
|
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We next examined the level of histone acetylation in MCF-7 and ZR-75
human breast cancer cells after treatment with MS-275. Histones were
isolated from cells treated with MS-275 (0.5 µM) for 0,
1, 3, 6, 9, and 24 h. Western blot analysis showed that before
incubation with MS-275 (0 h), the levels of acetylated histone H3 and
H4 in MCF-7 and ZR-75 breast cancer cells were low, with the exception
of the acetylated H3 protein in ZR-75 (Fig. 2, a and b)
. The accumulation of acetylated
histones H3 and H4 was increased after 6 h, and the maximum levels
of acetylated H3 and H4 proteins were detected after 24 h of
incubation (Fig. 2, a and b)
.

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Fig. 2. Western blot analysis of acetylated histone H3 and
H4 protein in MCF-7 and ZR-75 human breast cancer cells. Histones were
isolated by acid-soluble extraction from MCF-7 (a) and
ZR-75 (b) cells cultured for the indicated times with 0.
5 µM MS-275.
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MS-275 Induces Expression of TßRII mRNA.
To test the hypothesis that TßRII gene
expression is suppressed by deacetylation of histones or transcription
factors, we treated these breast cancer cell lines with MS-275, an
inhibitor of HDACs. As shown in Fig. 3
, such treatment resulted in a markedly enhanced expression of the
TßRII transcript. However, the TßRI transcript was not induced in
cell lines. Receptor cross-linking assays further demonstrated that
MS-275 treatment increases the level of TßRII protein (data not
shown).

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Fig. 3. MS-275 induces TßRII mRNA expression in human breast
cancer cell lines. Cells were treated with 1 µM MS-275
for 24 h, and TßRII induction was examined by Northern analysis.
Fifteen µg of total RNA were loaded in each lane, with equal loading
verified by ethidium bromide staining and
ß-actin gene expression.
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MS-275 Induces Accumulation of Acetylated Histones in Chromatin
Associated with the TßRII Gene.
The effect of HDAC inhibition on the acetylation of histone H4 or H3
associated with the TßRII gene promoter was examined using ChIP assay
in MCF-7 and ZR-75 human breast cancer cells. Chromatin fragments from
cells cultured with and without MS-275 (0.5 µM) for
24 h were immunoprecipitated with an antibody to acetylated
histone H3 or H4. DNA from the immunoprecipitate was isolated. As shown
in Fig. 4a
, a 152-bp fragment of the TßRII promoter region was
amplified. After treatment with MS-275, approximately 5.5-fold more
TßRII promoter DNA in ZR-75 cells and 8-fold more TßRII promoter
DNA in MCF-7 cells using antiacetylated H4 antibodies and 6.5-fold more
TßRII promoter DNA in MCF-7 cells using antiacetylated H3 antibodies
were associated with highly acetylated histones, compared with the same
region isolated from cells cultured without MS-275 (Fig. 4)
. The
acetylation of histone H4 associated with the
TßRII gene was increased in both MCF-7 and
ZR-75 cells by treatment with MS-275, whereas the acetylation of
histone H3 associated with TßRII was only
increased in MCF-7 cells.

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Fig. 4. MS-275 induces accumulation of acetylated histone H3 or
H4 in chromatin associated with the
TßRII gene. a, schematic
representation of the promoter and 5' untranslated regions of the human
TßRI and
TßRII genes. Chromatin fragments from
cells cultured with and without MS-275 (0.5 µM) for
24 h were immunoprecipitated with antibody to acetylated histone
H3 or H4 in MCF-7 (b) and ZR-75 (c) human
breast cancer cells. PCR primers for the region of
TßRII and
TßRI genes were used to amplify the DNA
isolated from the immunoprecipitated chromatin as indicated in
"Materials and Methods." b and c were
scanned and quantified by a densitometer. The ratio between input DNA
and precipitated DNA by H3 and H4 antibody was calculated for each
treatment and each primer set. Fold increases were calculated by
dividing the signal intensity of the MS-275-treated sample by the
signal intensity of the untreated sample.
|
|
To determine whether this effect is selective for TßRII, we examined
the level of histone H4 or H3 acetylation in the
TßRI gene. The expression of
TßRI gene was not altered by treatment with
MS-275 (Figs. 3
and 4)
. No change in the levels of histone H3 or H4
acetylation was detected after exposure to MS-275 (Fig. 4)
. These
results suggest that TßRII but not TßRI expression is modulated by
the histone deacetylation.
MS-275 Treatment Enhances TGF-ß Signaling.
Because an inhibitor of HDACs has profound effects on cell growth, we
could not examine the effect of the enhanced expression of
TßRII gene by the treatment of MS-275 on the
autocrine and paracrine growth-regulatory activities of TGF-ß in
these cells. Therefore, to determine whether reduced expression of
TßRII gene by histone deacetylation was
responsible for blocking TGF-ß signaling in human breast cancer
cells, we examined the expression of the PAI-1 in ZR-75 and HS-578t
cells cultured with MS-275 with or without TGF-ß1. MS-275 treatment
enhanced expression of PAI-1 mRNA (Fig. 5)
. However, treatment with both MS-275 and TGF-ß1 markedly enhanced
expression of PAI-1 mRNA (Fig. 5)
. These results suggest that treatment
with MS-275 enhances TGF-ß1 signaling through the induction of
TßRII gene expression.

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Fig. 5. MS-275 enhances PAI-1 mRNA expression induced by TGF-ß1.
Cells were treated with both MS-275 (1 µM) and TGF-ß1
(5 ng/ml) for 24 h. Total RNA was isolated from these cells and
analyzed by Northern blot analysis using 32P-labeled PAI-1
and ß-actin probes.
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 |
Discussion
|
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TGF-ß plays a critical role in many cellular processes by
regulating the cell cycle and cell differentiation (9
, 10)
. Because the effects of TGF-ß are dependent on the
expression of specific cell surface receptors, it has been proposed
that the regulation of the expression of these receptors will emerge as
an important mechanism for determining cellular responsiveness to
TGF-ß. We have recently identified a subset of human gastric cancer
cell lines that is resistant to TGF-ß. Further analysis revealed that
the cells lack TßRII mRNA expression despite the presence of a normal
gene (11)
. Transfection of cyclin D1, a gene overexpressed
in human malignancies, into human esophageal cells leads to the
down-regulation of TßRII expression and TGF-ß resistance
(18)
. The cause and effect relationship between the loss
of TßRII expression and the resistance to TGF-ß has been firmly
established by published studies that reported that transfecting
breast, colon, liver, and gastric cells with wild-type TßRII
successfully restored TGF-ß growth-inhibitory activity (19
, 20)
. These observations suggest that the transcriptional
repression of TßRII expression may be important in modulating
responsiveness to TGF-ß during carcinogenesis.
Gene expression can be suppressed by either a reduced expression of
positive transcription factors or an increased expression of
transcriptional suppressors. We have shown that the expression of
TßRII is regulated by the ets family of transcription
factors and that loss of expression of ERT/ESE-1/ESX/jen/Lef-3, a
member of the ets transcription factor family, leads to the
loss of TßRII expression (21, 22, 23)
. In this study, we
have shown that MS-275, an inhibitor of HDACs, induces the
transcription of TßRII and an accumulation of acetylated histones
associated with the promoter of that gene. The accumulation of
acetylated histones by MS-275 appears to be specific to TßRII (Fig. 4)
. The TßRI gene is not transcriptionally
activated, and there is no change in the level of acetylated histone in
chromatin associated with this gene in response to MS-275 (Fig. 4)
. We
have recently shown that TßRI expression is transcriptionally
repressed by DNA methylation and that the treatment with a
demethylating agent, 5-aza-2'-deoxycytidine, resulted in an increased
expression of the TßRI gene, but not the
TßRII gene (24)
. These results
suggest that the expression of TGF-ß receptors is actively
inactivated by two distinct epigenetic mechanisms, DNA methylation and
histone deacetylation.
HDAC inhibitors such as MS-275, sodium butyrate, and trichostatin
induce the expression of p21WAF1 in a
p53-independent manner (4, 5, 6, 7, 8)
. The promoter region of the
p21WAF1 gene responsive to sodium butyrate is
required for the activation of the p21WAF1
promoter by TGF-ß (25
, 26)
. However, Sp1, but not Sp3,
mediates the p21WAF1 promoter activation by
TGF-ß, whereas Sp3, but not Sp1, mediates the transcriptional
activation of the p21WAF1 promoter by
trichostatin A (7)
. These findings suggest that HDAC
inhibitors may induce the expression of the
p21WAF1 gene through both TGF-ß-dependent and
-independent mechanisms. The TGF-ß-independent pathway involves Sp3,
whereas the TGF-ß-dependent pathway is mediated through the
TGF-ß-responsive element in the p21WAF1
promoter by inducing TGF-ß signaling through the induction of TßRII
expression.
Several HDAC inhibitors, including oxamflatin (27)
,
MS-275 (14)
, and the hydroxamic acid-based hybrid
polar compounds (4
, 5)
, inhibit tumor growth in animal
models. However, the detailed mechanisms of inhibition of tumor growth
are not known. Our present study suggests that the restoration of
TGF-ß signaling through the induction of TßRII is a major target of
HDAC inhibitors in suppressing tumor growth.
 |
ACKNOWLEDGMENTS
|
|---|
We thank I. Kim and S. P. Patel for helpful discussion and
critical review of the manuscript.
 |
FOOTNOTES
|
|---|
The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
1 These two authors equally contributed to this
work. 
2 To whom requests for reprints should be
addressed, at Laboratory of Cell Regulation and Carcinogenesis,
National Cancer Institute, Bethesda, MD 20892-5055. Phone:
(301) 496-8350; Fax: (301) 496-8395; E-mail: kims{at}dce41.nci.nih.gov 
3 The abbreviations used are: HDAC, histone
deacetylase; TGF, transforming growth factor; TßRII, TGF-ß type II
receptor; TßRI, TGF-ß type I receptor; PAI, plasminogen activator
inhibitor; ChIP, chromatin immunoprecipitation. 
Received 11/14/00.
Accepted 12/ 4/00.
 |
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K. Song, T. L. Krebs, and D. Danielpour
Novel Permissive Role of Epidermal Growth Factor in Transforming Growth Factor beta (TGF-beta) Signaling and Growth Suppression: MEDIATION BY STABILIZATION OF TGF-beta RECEPTOR TYPE II
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R. W. Robey, Z. Zhan, R. L. Piekarz, G. L. Kayastha, T. Fojo, and S. E. Bates
Increased MDR1 Expression in Normal and Malignant Peripheral Blood Mononuclear Cells Obtained from Patients Receiving Depsipeptide (FR901228, FK228, NSC630176)
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S. E. Witta, R. M. Gemmill, F. R. Hirsch, C. D. Coldren, K. Hedman, L. Ravdel, B. Helfrich, R. Dziadziuszko, D. C. Chan, M. Sugita, et al.
Restoring E-Cadherin Expression Increases Sensitivity to Epidermal Growth Factor Receptor Inhibitors in Lung Cancer Cell Lines
Cancer Res.,
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Q. C. Ryan, D. Headlee, M. Acharya, A. Sparreboom, J. B. Trepel, J. Ye, W. D. Figg, K. Hwang, E. J. Chung, A. Murgo, et al.
Phase I and Pharmacokinetic Study of MS-275, a Histone Deacetylase Inhibitor, in Patients With Advanced and Refractory Solid Tumors or Lymphoma
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K. N. Bhalla
Epigenetic and Chromatin Modifiers As Targeted Therapy of Hematologic Malignancies
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J.-H. Park, Y. Jung, T. Y. Kim, S. G. Kim, H.-S. Jong, J. W. Lee, D.-K. Kim, J.-S. Lee, N. K. Kim, T.-Y. Kim, et al.
Class I Histone Deacetylase-Selective Novel Synthetic Inhibitors Potently Inhibit Human Tumor Proliferation
Clin. Cancer Res.,
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S. Ammanamanchi and M. G. Brattain
Restoration of Transforming Growth Factor-{beta} Signaling through Receptor RI Induction by Histone Deacetylase Activity Inhibition in Breast Cancer Cells
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L. Catley, E. Weisberg, Y.-T. Tai, P. Atadja, S. Remiszewski, T. Hideshima, N. Mitsiades, R. Shringarpure, R. LeBlanc, D. Chauhan, et al.
NVP-LAQ824 is a potent novel histone deacetylase inhibitor with significant activity against multiple myeloma
Blood,
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R. R. Rosato, J. A. Almenara, and S. Grant
The Histone Deacetylase Inhibitor MS-275 Promotes Differentiation or Apoptosis in Human Leukemia Cells through a Process Regulated by Generation of Reactive Oxygen Species and Induction of p21CIP1/WAF1 1
Cancer Res.,
July 1, 2003;
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J. Jaboin, J. Wild, H. Hamidi, C. Khanna, C. J. Kim, R. Robey, S. E. Bates, and C. J. Thiele
MS-27-275, an Inhibitor of Histone Deacetylase, Has Marked in Vitro and in Vivo Antitumor Activity against Pediatric Solid Tumors
Cancer Res.,
November 1, 2002;
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K. B. Glaser, J. Li, M. E. Aakre, D. W. Morgan, G. Sheppard, K. D. Stewart, J. Pollock, P. Lee, C. Z. O'Connor, S. N. Anderson, et al.
Transforming Growth Factor {beta} Mimetics: Discovery of 7-[4-(4-Cyanophenyl)phenoxy]-Heptanohydroxamic Acid, a Biaryl Hydroxamate Inhibitor of Histone Deacetylase
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J. Tsubaki, V. Hwa, S. M. Twigg, and R. G. Rosenfeld
Differential Activation of the IGF Binding Protein-3 Promoter by Butyrate in Prostate Cancer Cells
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M. V. Karamouzis, V. G. Gorgoulis, and A. G. Papavassiliou
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S. H. Park, S. R. Lee, B. C. Kim, E. A. Cho, S. P. Patel, H.-B. Kang, E. A. Sausville, O. Nakanishi, J. B. Trepel, B. I. Lee, et al.
Transcriptional Regulation of the Transforming Growth Factor beta Type II Receptor Gene by Histone Acetyltransferase and Deacetylase Is Mediated by NF-Y in Human Breast Cancer Cells
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Y. A. Elsayed and E. A. Sausville
Selected Novel Anticancer Treatments Targeting Cell Signaling Proteins
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[Abstract]
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J.-W. Han, S. H. Ahn, Y. K. Kim, G.-U. Bae, J. W. Yoon, S. Hong, H. Y. Lee, Y.-W. Lee, and H.-W. Lee
Activation of p21WAF1/Cip1 Transcription through Sp1 Sites by Histone Deacetylase Inhibitor Apicidin. INVOLVEMENT OF PROTEIN KINASE C
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H. Osada, Y. Tatematsu, A. Masuda, T. Saito, M. Sugiyama, K. Yanagisawa, and T. Takahashi
Heterogeneous Transforming Growth Factor (TGF)-{beta} Unresponsiveness and Loss of TGF-{beta} Receptor Type II Expression Caused by Histone Deacetylation in Lung Cancer Cell Lines
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[Abstract]
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