Abstract:
:Histone deacetylases (HDACs) are epigenetic regulators that are important for the control of various pathophysiological events. We found that HDAC inhibitors completely abolished transforming growth factor-β1 (TGF-β1)-induced apoptosis in AML-12 and primary mouse hepatocytes. Expression of a dominant-negative mutant of HDAC1 or downregulation of HDAC1 by RNAi both suppressed TGF-β1-induced apoptosis. In addition, overexpression of HDAC1 enhanced TGF-β1-induced apoptosis, and the rescue of HDAC1 expression in HDAC1 RNAi cells restored the apoptotic response of cells to TGF-β1. These data indicate that HDAC1 functions as a proapoptotic factor in TGF-β1-induced apoptosis. In contrast, downregulation of HDAC2 by RNAi increased spontaneous apoptosis and markedly enhanced TGF-β1-induced apoptosis, suggesting that HDAC2 has a reciprocal role in controlling cell survival. Furthermore, inhibition of extracellular signal-regulated kinase 1/2 (ERK1/2) by MEK1 inhibitor PD98059 or expression of a kinase-dead mutant of MEK1 restored the apoptotic response to TGF-β1 in HDAC1 RNAi cells. Strikingly, HDAC2 RNAi caused an inhibition of ERK1/2, and the spontaneous apoptosis can be abolished by reactivation of ERK1/2. Taken together, our data demonstrate that HDAC1 and 2 reciprocally affect cell viability by differential regulation of ERK1/2; these observations provide insight into the roles and potential mechanisms of HDAC1 and 2 in apoptosis.
journal_name
Cell Death Disjournal_title
Cell death & diseaseauthors
Lei WW,Zhang KH,Pan XC,Wang DM,Hu Y,Yang YN,Song JGdoi
10.1038/cddis.2010.21subject
Has Abstractpub_date
2010-05-20 00:00:00pages
e44issn
2041-4889pii
cddis201021journal_volume
1pub_type
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journal_title:Cell death & disease
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journal_title:Cell death & disease
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journal_title:Cell death & disease
pub_type: 杂志文章
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journal_title:Cell death & disease
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journal_title:Cell death & disease
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journal_title:Cell death & disease
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journal_title:Cell death & disease
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journal_title:Cell death & disease
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journal_title:Cell death & disease
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