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Molecular and Cellular Biology, March 2002, p. 1844-1857, Vol. 22, No. 6
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.6.1844-1857.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Precipitous Release of Methyl-CpG Binding Protein 2 and Histone Deacetylase 1 from the Methylated Human Multidrug Resistance Gene (MDR1) on Activation{dagger}

Assam El-Osta,1,2* Phillip Kantharidis,1 John R. Zalcberg,1 and Alan P. Wolffe3

Sir Donald & Lady Trescowthick Research Laboratories, Peter MacCallum Cancer Institute, East Melbourne, Victoria 3002, Australia,1 Laboratory of Molecular Embryology, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892-5431,2 Sangamo BioSciences, Inc., Point Richmond Technical Center, Richmond, California 948043

Received 17 September 2001/ Returned for modification 5 November 2001/ Accepted 30 November 2001

Overexpression of the human multidrug resistance gene 1 (MDR1) is a negative prognostic factor in leukemia. Despite intense efforts to characterize the gene at the molecular level, little is known about the genetic events that switch on gene expression in P-glycoprotein-negative cells. Recent studies have shown that the transcriptional competence of MDR1 is often closely associated with DNA methylation. Chromatin remodeling and modification targeted by the recognition of methylated DNA provide a dominant mechanism for transcriptional repression. Consistent with this epigenetic model, interference with DNA methyltransferase and histone deacetylase activity alone or in combination can reactivate silent genes. In the present study, we used chromatin immunoprecipitation to monitor the molecular events involved in the activation and repression of MDR1. Inhibitors of DNA methyltransferase (5-azacytidine [5aC]) and histone deacetylase (trichostatin A [TSA]) were used to examine gene transcription, promoter methylation status, and the chromatin determinants associated with the MDR1 promoter. We have established that methyl-CpG binding protein 2 (MeCP2) is involved in methylation-dependent silencing of human MDR1 in cells that lack the known transcriptional repressors MBD2 and MBD3. In the repressed state the MDR1 promoter is methylated and assembled into chromatin enriched with MeCP2 and deacetylated histone. TSA induced significant acetylation of histones H3 and H4 but did not activate transcription. 5aC induced DNA demethylation, leading to the release of MeCP2, promoter acetylation, and partial relief of repression. MDR1 expression was significantly increased following combined 5aC and TSA treatments. Inhibition of histone deacetylase is not an overriding mechanism in the reactivation of methylated MDR1. Our results provide us with a clearer understanding of the molecular mechanism necessary for repression of MDR1.

* Corresponding author. Mailing address: Sir Donald & Lady Trescowthick Research Laboratories, Peter MacCallum Cancer Institute, St. Andrews Place, East Melbourne, Victoria 3002, Australia. Phone: 613-9-656-1100. Fax: 613-9-656-1411. E-mail: s.el-osta{at}pmci.unimelb.edu.au.

{dagger} A.E.-O. dedicates this work to the living memory of his good friend and mentor Alan P. Wolffe.

Molecular and Cellular Biology, March 2002, p. 1844-1857, Vol. 22, No. 6
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.6.1844-1857.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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