Lookup NU author(s): Dr Matthew Barter,
Dr Gary Litherland,
Emeritus Professor Drew Rowan,
Emeritus Professor Tim Cawston,
Professor David Young
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Histone deacetylases (HDACs) regulate the acetylation of histones in the control of gene expression. Many non-histone proteins are also targeted for acetylation, including TGF-beta signalling pathway components such as Smad2, Smad3 and Smad7. Our studies in mouse C3H10T1/2 fibroblasts suggested that a number of TGF-beta-induced genes that regulate matrix turnover are selectively regulated by HDACs. Blockade of HDAC activity with trichostatin A (TSA) abrogated the induction of a disintegrin and metalloproteinase 12 (Adam 12) and tissue inhibitor of metalloproteinases-1 (Timp-1) genes by TGF-beta. whereas plasminogen activator inhibitor-1 (Pai-1) expression was unaffected. Analysis of the activation of cell signalling pathways demonstrated that TGF-beta induced robust ERK and PI3K activation with delayed kinetics compared to the phosphorylation of Smads. The TGF-beta induction of Adam12 and Timp-1 was dependent on such non-Smad signalling pathways and, importantly, HDAC inhibitors completely blocked their activation without affecting Smad signalling. Analysis of TGF-beta-induced Adam12 and Timp-1 expression and ERK/PI3K signalling in the presence of semi-selective HDAC inhibitors valproic acid, MS-275 and apicidin implicated a role for class I HDACs. Furthermore, depletion of HDAC3 by RNA interference significantly down-regulated TGF-beta-induced Adam 12 and Timp-1 expression without modulating Pai-1 expression. Correlating with the effect of HDAC inhibitors, depletion of HDAC3 also blocked the activation of ERK and PI3K by TGF-beta. Collectively, these data confirm that HDACs, and in particular HDAC3, are required for activation of the ERK and PI3K signalling pathways by TGF-beta and for the subsequent gene induction dependent on these signalling pathways. (C). 2010 Elsevier By. All rights reserved.
Author(s): Barter MJ, Pybus L, Litherland GJ, Rowan AD, Clark IM, Edwards DR, Cawston TE, Young DA
Publication type: Article
Publication status: Published
Journal: Matrix Biology
Print publication date: 12/05/2010
ISSN (print): 0945-053X
ISSN (electronic): 1569-1802
Publisher: Elsevier BV
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