Abstract:
:Trichostatin A (TSA), a histone deacetylase inhibitor, strongly increases acetylation of the N-terminal tails of histone H3. Many studies have correlated the function of TSA with the hyperacetylation of histone. Although histone H3 is known to be phosphorylated, the effect of acetylation on phosphorylation is not known. Here, we report that in JB6 cells, TSA induces both acetylation at lysine 9 and phosphorylation at serine 28 of histone H3. UVB irradiation, which is known to induce phosphorylation at serine 28, did not significantly affect phosphorylation of histone H3 in TSA-pretreated JB6 cells. In contrast, TSA markedly increased phosphorylation and acetylation of histone H3 in UVB-pretreated JB6 cells. TSA strongly activated MAP kinases. Moreover, PD98059 and SB202190 inhibited TSA-induced phosphorylation but not acetylation of histone H3. Dominant negative mutant ERK2 and dominant negative mutant p38 kinase blocked TSA-stimulated phosphorylation of histone H3 at serine 28. The results indicate that TSA-induced phosphorylation of histone H3 at serine 28 occurs through activation of the MAP kinase pathway and phosphorylated histone H3 is more sensitive to TSA-induced hyperacetylation. The facilitation of phosphorylation and acetylation of histone H3 induced by TSA may play a critical regulatory role in chromatin remodeling and gene expression.
journal_name
Oncogenejournal_title
Oncogeneauthors
Zhong S,Goto H,Inagaki M,Dong Zdoi
10.1038/sj.onc.1206507subject
Has Abstractpub_date
2003-08-14 00:00:00pages
5291-7issue
34eissn
0950-9232issn
1476-5594pii
1206507journal_volume
22pub_type
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