Differential effects of histone deacetylase inhibitors on
phorbol ester- and TGF-b1 induced murine tissue inhibitor
of metalloproteinases-1 gene expression
David A. Young*, Olivia Billingham, Clara L. Sampieri, Dylan R. Edwards and Ian M. Clark
School of Biological Sciences, University of East Anglia, Norwich, UK
Remodelling of the extracellular matrix (ECM) is an
essential physiological process in, e.g. development,
wound healing and angiogenesis. Aberrant ECM turn-
over is also associated with a number of pathological
processes such as joint destruction in the arthritides,
tumour metastasis, and fibrosis [1]. Central to the
turnover of ECM is the matrix metalloproteinase
(MMP) family; these number 23 enzymes in man
which, between them, have the capability of degrading
the majority of ECM proteins [2]. Four tissue inhibi-
tors of metalloproteinases (TIMPs) safeguard ECM
integrity by virtue of their ability to inhibit the
MMPs [3]. The TIMPs display a high degree of func-
tional overlap, but show dramatic differences in their
Keywords
acetylation; c-Jun;TGFb; TIMP; trichostatin A
Correspondence
I. M. Clark, School of Biological Sciences,
University of East Anglia, Norwich, NR4
7TJ, UK
Tel: +44 1603 592760
Fax: +44 1603 592250
E-mail:
*Present address
Department of Rheumatology, University of
Newcastle- upon-Tyne, NE2 4HH, UK

have demonstrated specific protein binding to two of these regions which
contain either an avian erythroblastosis virus E26 (v-ets) oncogene homo-
logue (Ets) or Sp1 binding motif.
Abbreviations
AP-1, activating protein-1; EMSA, electrophoretic mobility-shift assay; Ets, avian erythroblastosis virus E26 (v-ets) oncogene homologue;
HAT, histone acetyltransferase; HDAC, histone deacetylase; HDACi, histone deacetylase inhibitor; MMP, matrix metalloproteinase;
NaB, sodium butyrate; PMA, phorbol myristate acetate; TIMP, tissue inhibitor of metalloproteinases; TGF, transforming growth factor;
TSA, trichostatin A; VPA, valproic acid.
1912 FEBS Journal 272 (2005) 1912–1926 ª 2005 FEBS
patterns of expression both during development and in
response to stimuli. Timp-1 gene expression can be
induced by a variety of stimuli including phorbol esters
(PMA), serum, transforming growth factor b (TGFb),
retinoids and interleukin-6 family members; where it
has been assessed, induction is at the level of transcrip-
tion [4]. The expression of Timp-1 has been implicated
in many disease processes including tumour progres-
sion, fibrosis, cardiovascular disease and arthritis [3].
Modulation of Timp-1 may therefore have therapeutic
potential in several pathologies [5], and an understand-
ing of the mechanisms impacting upon Timp-1 gene
expression is paramount.
Dissection of the Timp-1 gene promoter has revealed
several important cis-acting sequences. An AP-1 site
located at )59 ⁄ )53 in the murine gene is important in
both basal and inducible Timp-1 gene expression, with
a neighbouring avian erythroblastosis virus E26 (v-ets)
oncogene homologue (Ets)-binding site playing a more
minor role [6–8]. Many other regions of the gene pro-
moter and first intron have been shown to be import-

erally repressive to transcription, hindering access of
the transcriptional apparatus [12]. However, two major
mechanisms exist that modulate chromatin structure to
allow transcriptional activity: first, ATP-dependent
nucleosome remodellers such as the Swi⁄ Snf complex
[13,14] and second, the enzymatic modification of
histones, via acetylation, methylation and phosphory-
lation [15–18].
Acetylation by histone acetyltransferases (HATs)
occurs on specific lysine residues on the N-terminal tails
of histone H2A, H2B, H3 and H4. This neutralization
of positive charge leads to a loosening of the his-
tone:DNA structure, allowing access of the trans-
criptional machinery; furthermore, the acetyl groups
may associate with and recruit factors containing
bromo-domains [12]. Many transcriptional activators or
coactivators have (or recruit) HAT activity, giving a
mechanism whereby acetylation can be targeted to
specific gene promoters [15,16]. Conversely, histone
deacetylases (HDACs) have also been characterized.
Hypoacetylation of histones associates with transcrip-
tional silence, and several transcriptional repressors and
corepressors have been identified which have (or recruit)
HDAC activity [17,19]. Non-histone substrates of HATs
have also been described, e.g. p53, E2F, NF-jB, Sp3
and c-Jun; these latter two transcription factors are
known to be important in Timp-1 expression [20,21].
Trichostatin A (TSA), sodium butyrate (NaB) and
valproic acid (VPA) are HDAC inhibitors (HDACi)
[22–24]. Addition of these reagents to cells should there-

ation in the control of Timp-1 gene expression by PMA
vs. TGFb1. Figure 1C shows a comparison between
two cell lines, C3H10T1 ⁄ 2 and Swiss3T3, stimulated
with TGF-b1 or PMA, in the presence or absence of
TSA to confirm the original observations were not a
cell-type dependent phenomenon. The fold induction by
TSA above the PMA-induced level is higher in
C3H10T1 ⁄ 2 than Swiss 3T3 as the response to PMA
alone is greater in the latter cell line. The effect of NaB
on induced Timp-1 expression in Swiss 3T3 cells also
mirrors that seen in C3H10T1 ⁄ 2 (data not shown).
Using an anti-(acetyl-lysine) Ig, TSA could be seen to
cause an increase in acetylation of total histones from
C3H10T1 ⁄ 2 nuclear cell extracts (Fig. 1C; lower panel).
PMA- vs. TGF-b1 induction of Timp-1 display
differential sensitivity to HDACi
Representative dose–response curves of the effect of
HDACi’s on either PMA- or TGF-b1-induced Timp-1
gene expression are shown in Fig. 2A–C. For PMA
induction of Timp-1 expression, TSA superinduces
this expression with an optimum dose of 250 > 1000
ngÆmL
)1
(0.8–3.3 lm, depending upon experiment),
whilst for NaB the optimum dose is 5 mm. Another
known HDACi, VPA, had no effect on PMA-induced
Timp-1 expression until a concentration greater than
2mm was added. In contrast to this, TGF-b1-induced
Timp-1 expression is more sensitive to HDACi, with an
optimum dose of TSA being less than 50 ngÆmL

M PMA
or 4 ngÆmL
)1
TGF-b1 for 6 h in the presence or absence of
500 ngÆmL
)1
TSA. Isolated total RNA subjected to qRT-PCR and
normalized as described above. Nuclear extracts (10 lg) from the
C3H10T1 ⁄ 2 cells were western blotted with an anti-(acetyl–lysine)
Ig to monitor acetylation (histone band assigned by molecular mass
and abundance).
HDAC inhibitors and Timp-1 expression D. A. Young et al.
1914 FEBS Journal 272 (2005) 1912–1926 ª 2005 FEBS
These data show that different HDACs are involved in
the TGFb vs. PMA induction of Timp-1. Two specific
inhibitors of the Sir2 family of deacetylases (class 3
HDACs), sirtinol and nicotinamide, had no effect on
induced or basal Timp-1 expression (data not shown)
showing that class 3 HDACs are not involved.
Induction of the Timp-1 gene by PMA or TGF-b1
requires new protein synthesis
In order to assess the possibility that the effects of
HDACi are secondary, acting to modulate the
expression of an intermediate, the requirement for
new protein synthesis in the induction of Timp-1 was
assessed. Figure 3 shows that addition of the protein
synthesis inhibitor, emetine, completely abrogates both
PMA- and TGF-b1-induction of the Timp-1 gene. In the
presence of emetine, the HDACi have no further effect
(data not shown). The action of HDACi could therefore

TGF-b1 for 6 h in the
presence or absence of (A) 0–1000 ngÆmL
)1
TSA; (B) 0–10 mM
NaB, or (C) 0–8 mM VPA. Total RNA was isolated and subjected to
real-time qRT-PCR for Timp-1; data were normalized to the 18S
rRNA housekeeping gene. Data is representative of at least two
independent experiments in all cases.
Fig. 3. The induction of Timp-1 by PMA or TGF-b1 is protein synthe-
sis dependent. C3H10T1 ⁄ 2 murine fibroblasts were serum starved
for 24 h, then stimulated with 10
)7
M PMA or 2 ngÆmL
)1
TGF-b1for
6 h in the presence or absence of the protein synthesis inhibitor
emetine at 10 l gÆmL
)1
. Total RNA was isolated and subjected to
real-time qRT-PCR for Timp-1; data were normalized to the 18S
rRNA housekeeping gene. Data is plotted mean + SEM, n ¼ 3.
D. A. Young et al. HDAC inhibitors and Timp-1 expression
FEBS Journal 272 (2005) 1912–1926 ª 2005 FEBS 1915
expression of the AP-1 family member c-fos, over the
same time course experiment (Fig. 4A). Previously, we
have shown that c-fos overexpression induces Timp-1
expression [11]; c-fos is a known immediate early gene
induced by PMA. We initially confirmed this using the
protein synthesis inhibitor cycloheximide, which as
B

1916 FEBS Journal 272 (2005) 1912–1926 ª 2005 FEBS
expected, did not block the induction of c-fos mRNA by
PMA. The kinetics of c-fos induction closely precedes
that of Timp-1.At1h,c-fos was dramatically induced
by PMA. Further, this induction was superinduced by
TSA; by 3 h the PMA induction was lost, but TSA in
the presence of PMA still superinduced c-fos expression.
Compared to PMA, TGF-b1 induction of c-fos was
delayed, only becoming apparent by 3 h; this induction
remained at 6 h but was lost by 12 h. Similar to Timp-1
expression, TSA blocked TGF-b1 induced c-fos at all
time points where TGF-b1 alone induced c-fos expres-
sion. Interestingly, TSA alone induced c-fos but only
after 12 h of stimulation.
The Timp-1 gene contains an AP-1 motif at
)59 ⁄ )53 bp relative to the transcription start site [6].
Nuclear proteins were isolated from cells stimulated
for either 1 or 3 h with TGF-b1 or PMA, with or
without TSA. In an electrophoretic mobility-shift assay
(EMSA), AP-1 factors could be seen to bind a 30 bp
sequence encompassing the Timp-1 AP-1 motif and
this binding was induced by PMA (at both 1 and 3 h)
or TGF-b1 stimulation (at 3 h) (Fig. 4B). As with the
induction of c-fos mRNA, AP-1 protein binding activ-
ity was greater with PMA than TGF-b1, and the
induction by PMA occurred earlier than that by TGF-
b1. Stimulation with TSA alone or in the presence of
PMA or TGF-b1 appeared to have little effect on the
overall amount of AP-1 protein binding the Timp-1
AP-1 sequence; this was in marked contrast to that

To establish unequivocally the role of specific AP-1
family members upon Timp-1 expression, qRT-PCR
was performed on RNA from c-fos, c-Jun or junD defi-
cient cells (– ⁄ –) stimulated with PMA or TGF-b1 with
or without TSA; Swiss-3T3 cells were used as a
control. Surprisingly, Swiss-3T3, c-fos– ⁄ – and junD – ⁄ –
cells had the same Timp-1 expression profile as each
other and as that seen previously for C3H10T1 ⁄ 2 cells
(Fig. 5A). The fold induction by PMA or TGF-b1 was
remarkably similar between the different cell types and
for each of those three cell lines, TSA superinduced
PMA-induced Timp-1 expression and repressed TGF-
b1-induced Timp-1 expression. This shows that neither
c-fos nor junD are essential for the observed affects of
TSA on Timp-1 expression. However, although the
expression of Timp-1 in c-Jun– ⁄ – cells was induced by
either PMA or TGF-b1, TSA was unable to super-
induce the PMA-induced Timp-1 expression whilst
retaining the ability to repress the TGF-b1 induced
Timp-1 expression. In fact, in c-Jun– ⁄ – cells, much like
for the TGF-b1 response, TSA repressed PMA-
induced Timp-1, indicating that in the absence of c-Jun
(or a c-Jun-regulated factor), the default pathway for
the effect of TSA on induced Timp-1 expression is
repressive.
Many AP-1 members are differentially regulated
in response to PMA or TGF-b1 with or without
TSA
As even in the absence of c-fos, c-Jun or junD mouse
fibroblast cells are able to induce Timp-1 in response

TSA can no longer repress this); however, some PMA
induction of the deleted construct remains, and this is
superinduced by TSA (Fig. 6B). These data were con-
firmed using point mutation of the AP-1 site in a
)223 ⁄ +47 Timp-1 promoter construct (in the pGL3
vector); here, some PMA- and TGF-b1-induction of
the mutant construct remains. TSA superinduces
PMA-induced expression of the wild-type and mutant
AP-1 constructs, but TSA no longer represses the
residual TGF-b1-induction (Fig. 6C,D). This suggests
that the effect of TSA on TGF-b1-induced Timp-1
expression is mediated through the promoter proximal
AP-1 site, whilst the effect of TSA on PMA-induced
Fig. 5. TSA superinduction of PMA-induced
Timp-1 requires c-Jun but other AP-1
members may compensate for the loss of
c-fos. (A) Swiss-3T3, c-fos– ⁄ –, c-Jun– ⁄ –and
junD– ⁄ – mouse fibroblast cells were serum
starved for 24 h, then stimulated with 10
)7
M
PMA or 4 ngÆmL
)1
TGF-b1 in the presence or
absence of 500 ngÆmL
)1
TSA. Total RNA was
isolated after 6 h and subjected to real-time
qRT-PCR for Timp-1. Data were normalized
to the 18S rRNA housekeeping gene. Data is

(data not shown). The more robust expression levels
from this pGL3 compared to pGL2 (which is not
induced by TSA) make the data more reliable despite
this difference, and the effects of TSA upon PMA-
and TGF-b1-stimulated promoter-reporter expression
remain clear.
TSA superinduction of PMA-induced Timp-1
is lost by mutation of a GC-box or Ets binding
motif within the Timp-1 promoter
In order to establish if promoter elements downstream
of the AP-1 site can mediate the TSA superinduction
of PMA-induced Timp-1, a series of insertion mutants
were prepared in )223 ⁄ +47. In this set of constructs,
the AP-1 site at )59 ⁄ )53 remains intact, but down-
stream of this, blocks of five bases are replaced with
adenosine; these mutants overlap by two bases, giving
a set of 20 mutant constructs. Figure 7A shows that
only mutants m4, m16 and m20 lose the superinduc-
tion of PMA-induced expression by TSA. Mutant m4
alters a canonical Ets binding site, shown previously to
be important for basal expression of the Timp-1 gene;
mutant 16 alters a canonical Sp1 binding site (GC-
box); mutant 20 does not alter any known consensus
for transcription factor binding.
EMSA was used to determine the protein factors
binding to the ‘wild-type’ m4, m16 and m20 or the
mutated sequences. Specific factors binding to both the
‘wild-type’ m4 and m16 sequences could be seen
(Fig. 7B,C), however, the binding of these factors did
not change upon TSA stimulation (data not shown).

Discussion
HDACs usually act as transcriptional repressors, there-
fore HDAC inhibitors should induce expression of
susceptible genes, and this is the typical experimental
finding. However, in yeast, deletion of the HDAC
Rpd3 down-regulates a subset of genes, and many of
these are also repressed by treatment with TSA [27].
There are also many individual instances of HDAC
inhibitors acting as repressors of gene expression, e.g.
TSA and NaB cause a reduction in mRNA levels for
the cdk1 gene [28]; TSA represses b-casein expression
in mammary epithelial cells [29]; TSA represses cyclin
B1 and A [30]; TSA inhibits MMTV transcription [31].
One could postulate that these effects are indirect, with
TSA leading to the induction of a factor (or factors)
involved in the repression of a downstream target;
alternatively, a direct effect on either the acetylation of a
transcription factor, or recruitment of repressive factors
to acetyl–histones via bromodomain interactions could
be envisaged. In support of the latter notion the down-
B
A
C
Fig. 7. The impact of TSA on PMA-induced
Timp-1 gene expression is mediated via
three sites in the proximal promoter. (A)
C3H10T1 ⁄ 2 murine fibroblasts were transi-
ently transfected with a )223 ⁄ +47 Timp-1
promoter construct in pGL3 and 20mutant
constructs as shown. Following serum

of an anti-Sp1 Ig or anti-Sp3 Ig prior to
electrophoresis.
HDAC inhibitors and Timp-1 expression D. A. Young et al.
1920 FEBS Journal 272 (2005) 1912–1926 ª 2005 FEBS
regulation of cyclin A and B1 upon TSA treatment is
via diminished activity of NF-Y-associated HAT and
is mediated through CCAAT motifs; further, the
diminished HAT activity is mediated by phosphoryla-
tion of hGCN5 [30]. Moreover, the inhibition of
MMTV transcription by TSA does not depend on
changes in chromatin remodelling or increased histone
acetylation, but is mediated via the TATA-box region
[31].
Both TGF-b1- and PMA-induction of Timp-1
require new protein synthesis. As both events have at
least some dependency on a promoter proximal AP-1
site, this could reflect in part the synthesis of Fos and
Jun family members. Immediate early gene induction
correlates with a nucleosomal response whereby gene-
associated nucleosomes are subject to both phosphory-
lation and acetylation on histone H3 and acetylation
on histone H4 [16]. Whilst it is reported that TSA does
not activate c-fos or c-Jun expression in C3H10T1 ⁄ 2
cells [32], TSA can clearly modulate these genes in the
additional presence of TGF-b1 or PMA (Figs 4A and
5B). Moreover, TSA alone did induce c-fos expression
in our experiments after 12 h of stimulation. As the
kinetics of c-fos induction so clearly preceded that of
Timp-1, we analysed the expression of Timp-1 in c-fos
deficient mouse fibroblasts (Fig. 5A). Surprisingly,

presence of TSA (data not shown). We propose that
lactacystin prevents the degradation of ubiquitinated
c-Jun thus leading to its accumulation and preventing
its activation by JNK and subsequent downstream acti-
vation events that would lead to Timp-1 up-regulation.
A possible explanation for the lack of a TSA super-
induction of PMA-induced Timp-1 in c-Jun– ⁄ – cells is
that the expression of one or more HDACs is c-Jun-
dependent. To test this, we monitored the expression
of HDACs 1–11 in response to TGF-b1 or PMA, with
or without TSA, between C3H10T1 ⁄ 2, Swiss-3T3 and
c-Jun– ⁄ – cells by RT-PCR. The expression of class 1
HDACs is reported to be ubiquitous while class 2
HDAC appear more tissue-specific [39]. All three cell
lines expressed the majority of HDACs, with only
expression of HDAC9 and )10 being undetectable and
HDAC8 was up-regulated in c-Jun– ⁄ – cells compared
to C3H10T1 ⁄ 2 or Swiss-3T3 (data not shown). Only
HDAC7 and HDAC11 were regulated differentially by
any of the stimuli, and this was identical between all
three cell lines. HDAC7 was, in all cell lines, repressed
by the presence of TSA while HDAC11 expression was
interestingly induced only by the combination of TGF-
b1 and TSA (data not shown). Hence, none of the
HDACs exhibit c-Jun dependent expression.
Although the induction by PMA alone was partially
abrogated upon mutation or deletion of the )59 ⁄ )53
AP-1 motif of Timp-1, TSA was still able to superin-
duce reporter expression in the presence of PMA
(Fig. 7). This suggests that the impact of c-Jun on the

to turn Sp3 from a transcriptional repressor into an
activator [44]. We were unable to detect whether Sp3 or
Sp1 in our C3H10T1 ⁄ 2 cell system were acetylated
using the anti-(acetyl–lysine) Ig (data not shown).
Unlike many genes, Timp-1 induction by TGF- b1is
largely independent of the Smad signalling pathway in
C3H10T1 ⁄ 2 cells and is instead AP-1-dependent [11].
It has been shown previously that the AP-1 site at
)59 ⁄ )53 can act in concert with the neighbouring Ets
site at )45 ⁄ )41 (mutant m4) [45]. TGF-b1 causes the
acetylation of Ets1 and this is proposed to contribute
to the ability of Ets1 overexpression to abrogate TGF-
b1 induction of the Timp-1 gene [46]. HDACi would
probably increase the level of Ets1 acetylation by
TGF-b1, though the functional outcome of this is
unclear. The consequences of any potential PMA-
mediated acetylation of Ets1 are also unknown, but of
future interest, as mutation of the Ets binding motif
(m4) results in both a loss of protein binding and the
TSA superinduction of Timp-1.
Eleven NAD-independent HDACs have been des-
cribed in human and mouse, although few have been
characterized in detail. These have been subdivided
recently into three groups based upon phylogenetic
analysis [47]. Class 1 HDACs are structurally related
to yeast scRPD3, and contain HDAC1, )2, )3 and
)8, while class 2 HDACs, containing HDAC4, )5, )6,
)7, )9 and )10 are similar to yeast scHDA1.
HDAC11 alone represents class 4 HDACs and
HDAC11 related proteins have been described in all

10) is involved in the induction of Timp-1 by TGF-b1.
A caveat to this is the HDAC inhibition profiles of all
these HDACi are incomplete and are generally based
upon semipurified protein fractions and in vitro assays.
Finally, it is interesting to note that the HDACi
do not have an obvious effect on basal expression of
Timp-1, only on induced gene expression.
In conclusion, this is to our knowledge, the only
described instance of HDAC inhibitors having oppos-
ite effects on the same gene, depending upon the initial
stimulus used to induce expression. We have shown
that different HDACs are involved in the response of
the Timp-1 gene to PMA compared to TGF-b1. More-
over, c-Jun mediates the effect of HDAC inhibitors on
PMA-induced Timp-1, though not via the promoter
proximal AP-1 site. We have also identified cis-acting
promoter elements essential for the effect of HDAC
inhibitors on PMA-induced Timp-1 expression.
Experimental procedures
Cell culture
Murine C3H10T1 ⁄ 2 fibroblasts and Swiss-3T3 cells were
routinely cultured in Minimal Essential Medium (MEM)
with Earle’s salts and l -glutamine (2 mm) (Invitrogen,
Paisley, UK) containing 10% foetal bovine serum (FBS,
Invitrogen), 1% nonessential amino acids, 100 IUÆmL
)1
penicillin, 100 lgÆmL
)1
streptomycin and 20 unitsÆmL
)1

to the supplier’s instructions. Quantitative RT-PCR (qRT-
PCR) was performed using the Applied Biosystems, War-
rington, UK) ABI Prism 7700 sequence detection system
(TaqManÒ) as described [49]. Table 1 contains sequences of
TaqMan primers and probes for AP-1 family members.
Nuclear extracts and electrophoretic mobility-
shift assays
Nuclear extracts were prepared essentially as described pre-
viously [11] except where indicated cells were stimulated
with TSA (500 ngÆmL
)1
) and TSA (500 ngÆmL
)1
) was inclu-
ded in the all solutions for nuclear extract preparation.
Electrophoretic mobility-shift assays (EMSA) were
performed essentially as previously described [10,11]. Oligo-
nucleotides were synthesized by MWG-Biotech (London,
UK) or Sigma-Genosys (Haverhill, UK) (Table 2). Double-
stranded probes were labelled with [
32
P]ATP[cP] using T4
polynucleotide kinase. Nuclear extracts (2 lg), 0.5 lgof
poly(dIdC.dIdC), and radiolabelled probe (20 000 c.p.m.)
were incubated in 1· binding buffer (10 mm Tris ⁄ HCl,
pH 7.5, 50 mm NaCl, 0.5 mm dithiothreitol, 5 mm MgCl
2
,
and 5% glycerol) with or without competitor DNA for
20 min at 4 °C in a total volume of 10 lLat4°C. For

fosB Forward Primer 5¢-GCTCCCCTATCCTCGATATTTGA-3¢
Reverse Primer 5¢-CAGAACTCGTCTTTGGGACTGA-3¢
Probe 5¢-TTCCCACTATCCCACTCCATCCAATTCC-3¢
fra-1 Forward Primer 5¢-TGAACCGGAAGCACTGCATA-3¢
Reverse Primer 5¢-GTGAAAACCAGACTCGGAGTAAAAG-3¢
Probe 5¢-CACGCTCATGACCACACCCTCTCTGAC-3¢
fra-2 Forward Primer 5¢-CATCACTCCCGGCACTTCA-3¢
Reverse Primer 5¢-CGACGAAGGCGACTCCTG-3¢
Probe 5¢-TTGTCTTCACCTACCCCAATGTCCTGGA-3¢
D. A. Young et al. HDAC inhibitors and Timp-1 expression
FEBS Journal 272 (2005) 1912–1926 ª 2005 FEBS 1923
Southampton, UK); point mutations altered the wild-type
AP-1 site (5¢-TGAGTAA-3 ¢) to a nonfunctional mutant
AP-1 site (5¢-GgAGTgA-3¢) as described previously [11].
Twenty independent overlapping mutants were all gener-
ated in pGL2-223 ⁄ +47 [11], the Timp-1 promoter regions
were HindIII isolated and subcloned into pGL3-basic
(Fig. 7A). All mutagenesis was performed using the Quik-
Change method (Stratagene, Amsterdam, the Netherlands).
All mutations were verified by DNA sequencing.
Cells were seeded in six-well or 24-well plates at a density
of 8850 cellsÆcm
)2
and grown overnight in medium contain-
ing 10% (v ⁄ v) FBS at 37 °C in a 5% (v ⁄ v) CO
2
atmosphere. Cells were transfected overnight in serum-
containing medium with 1 lg per well (six-well plates) or
0.21 lg per well (24-well plates) reporter plasmid using
FuGene6 (Roche, Lewes, UK) according to the manufac-

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