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J. Biol. Chem., Vol. 278, Issue 9, 6838-6847, February 28, 2003
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From the The CBP and p300 proteins are
transcriptional co-activators that are involved in a variety of
transcriptional pathways in development and in response to
specific signaling pathways. We have previously demonstrated
that the ability of both these factors to stimulate transcription is
greatly enhanced by treatment of cardiac cells with the hypertrophic
agent phenylephrine (PE). Here, we show that inhibition of either CBP
or p300 with antisense or dominant negative mutant constructs inhibits
PE-induced hypertrophy as assayed by atrial naturetic protein
production, cardiac cell protein:DNA ratio and cell size. Furthermore,
we show that overexpression of CBP or p300 can induce hypertrophy and
that this effect requires their histone acetyltransferase (HAT)
activity. Moreover, we show that PE can directly enhance CBP HAT
activity and that artificial enhancement of HAT activity is sufficient
to induce hypertrophy. Hence, CBP and p300 play an essential role in
hypertrophy induced by PE, and this effect is mediated via
PE-induced enhancement of their HAT activity. This is the first time a
role for these factors, and their HAT activity, in hypertrophy has been
directly demonstrated.
The Transcriptional Co-activators CREB-binding Protein (CBP) and
p300 Play a Critical Role in Cardiac Hypertrophy That Is Dependent on
Their Histone Acetyltransferase Activity*
§,
Institute of Child Health, University
College London, 30 Guilford St., London WC1N 1EH and the
¶ National Heart and Lung Institute, Imperial College School of
Medicine, Dovehouse St., London SW3 6LY, United Kingdom
*
This work was supported in part by the British Heart
Foundation.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
To whom correspondence should be addressed. Tel.:
44-20-7905-2189; Fax: 44-20-7242-8437; E-mail:
d.latchman@ich.ucl.ac.uk.
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