Histone H4 deacetylation down-regulates catalase gene expression in doxorubicin-resistant AML subline.

Abstract:

:We explored if epigenetic mechanisms could be involved in the down-regulated expression of catalase gene (CAT) in the doxorubicin-resistant acute myelogenous leukemia (AML)-2/DX100 cells. Down-regulated CAT expression in AML-2/DX100 cells was completely recovered after treatment of hydrogen peroxide (H(2)O(2)) and histone deacetylase inhibitor, trichostatin A (TSA) but was increased slightly by the treatment of DNA methylation inhibitor, 5-aza-2'-deoxycytidine (5-AdC). Bisulfite-sequencing PCR revealed that a CpG island of CAT was not methylated in AML-2/DX100 cells. Chromatin immunoprecipitation assay confirmed that acetylation of histone H4 in AML-2/DX100 cells significantly decreased as compared with that in AML-2/WT cells, which was significantly increased by TSA more than 5-AdC. Meanwhile, overexpression of other up-regulated peroxidase genes appears to make compensation for decreased H(2)O(2)-scavenging activity for the down-regulated CAT expression in AML-2/DX100 cells. These results suggest that histone H4 deacetylation is responsible for the down-regulated CAT expression in AML-2/DX100 cells, which are well adapted to oxidative stress.

journal_name

Cell Biol Toxicol

authors

Lee TB,Moon YS,Choi CH

doi

10.1007/s10565-011-9201-y

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

11-8

issue

1

eissn

0742-2091

issn

1573-6822

journal_volume

28

pub_type

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