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Originally published In Press as doi:10.1074/jbc.M110122200 on January 22, 2002

J. Biol. Chem., Vol. 277, Issue 14, 11821-11827, April 5, 2002
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Functional Involvement of the Brahma/SWI2-related Gene 1 Protein in Cytochrome P4501A1 Transcription Mediated by the Aryl Hydrocarbon Receptor Complex*

Song Wang and Oliver HankinsonDagger

From the Department of Pathology and Laboratory Medicine, Center for the Health Sciences, University of California, Los Angeles, California 90095-1732

Chromatin remodeling is a key step in overcoming the nucleosomal repression of active transcription in eukaryotes. The mammalian SWI/SNF ATP-dependent chromatin-remodeling complexes contain multiple subunits. The ATPase activities in these complexes are attributable to either BRG-1 or the related Brahma protein. The aryl hydrocarbon receptor (AHR), after binding xenobiotic ligands such as 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), associates with the AHR nuclear translocator (ARNT), and the dimer so formed activates transcription of several genes, including the cytochrome P4501A1 (CYP1A1) gene. We show that BRG-1 potentiates AHR/ARNT-mediated reporter gene activity in a TCDD-dependent fashion in Hepa1c1c7 cells. Introduction of BRG-1 into the BRG-1- and hBrm-deficient SW13 and C33A human cell lines also enhances expression from a transiently transfected AHR/ARNT-dependent reporter gene. Replenishment of BRG-1 to SW13 cells also restores endogenous cytochrome P4501A1 (CYP1A1) gene expression, whereas an ATPase-deficient mutant of BRG-1 is unable to do so. Chromatin immunoprecipitation analysis demonstrated that BRG-1 associates with the enhancer region of the mouse CYP1A1 gene in vivo in a TCDD- and ARNT-dependent fashion, suggesting the specific recruitment of BRG-1 by AHR/ARNT. Finally, we demonstrate that the glutamine-rich subdomain of the transcriptional activation domain of AHR can interact with BRG-1. Together these studies reveal a functional involvement of BRG-1 in activating CYP1A1 gene transcription and implicate the importance of ATP-dependent chromatin remodeling activity on inducible gene expression mediated by AHR/ARNT.

* This work was supported by Grant CA28868 from the NCI, National Institutes of Health and by a predoctoral fellowship from the University of California Toxic Substances Research & Teaching Program (to S. W.).The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Dagger To whom correspondence should be addressed: Dept. of Pathology and Laboratory Medicine, Center for the Health Sciences, University of California, Los Angeles, CA 90095-1732. Tel.: 310-825-2936; Fax: 310-794-9272; E-mail: ohank@mednet.ucla.edu.

Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.


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