Molecular and Cellular Biology, April 2001, p. 2259-2268, Vol. 21, No. 7
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.7.2259-2268.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Departments of Molecular Pathology1 and Biochemistry and Molecular Biology,3 The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, and The H. Lee Moffitt Cancer Center and Research Institute, University of South Florida, Tampa, Florida 336122
Received 22 September 2000/Returned for modification 2 November 2000/Accepted 9 January 2001
The growth suppressor promyelocytic leukemia protein (PML) is
disrupted by the chromosomal translocation t(15;17) in acute promyelocytic leukemia (APL). PML plays a key role in multiple pathways
of apoptosis and regulates cell cycle progression. The present study
demonstrates that PML represses transcription by functionally and
physically interacting with histone deacetylase (HDAC). Transcriptional
repression mediated by PML can be inhibited by trichostatin A, a
specific inhibitor of HDAC. PML coimmunoprecipitates a significant
level of HDAC activity in several cell lines. PML is associated with
HDAC in vivo and directly interacts with HDAC in vitro. The fusion
protein PML-RAR
encoded by the t(15;17) breakpoint interacts with
HDAC poorly. PML interacts with all three isoforms of HDAC through
specific domains, and its expression deacetylates histone H3 in vivo.
Together, the results of our study show that PML modulates histone
deacetylation and that loss of this function in APL alters chromatin
remodeling and gene expression. This event may contribute to the
development of leukemia.
Present address: Division of Genetics, Department of Biology,
Faculty of Science, Isfahan University, Isfahan, Iran.
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