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PMID: 17709388 Published · ppublish English Journal Article Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't

NRF2 modulates aryl hydrocarbon receptor signaling: influence on adipogenesis.

Molecular and cellular biology ·Vol. 27 ·No. 20 ·2007-10-00 ·Pages 7188-97

Shin S, Wakabayashi N, Misra V, Biswal S, Lee GH, Agoston ES, Yamamoto M, Kensler TW

Abstract

The NF-E2 p45-related factor 2 (NRF2) and the aryl hydrocarbon receptor (AHR) are transcription factors controlling pathways modulating xenobiotic metabolism. AHR has recently been shown to affect Nrf2 expression. Conversely, this study demonstrates that NRF2 regulates expression of Ahr and subsequently modulates several downstream events of the AHR signaling cascade, including (i) transcriptional control of the xenobiotic metabolism genes Cyp1a1 and Cyp1b1 and (ii) inhibition of adipogenesis in mouse embryonic fibroblasts (MEFs). Constitutive expression of AHR was affected by Nrf2 genotype. Moreover, a pharmacological activator of NRF2 signaling, CDDO-IM {1-[2-cyano-3,12-dioxooleana-1,9(11)-dien-28-oyl]imidazole}, induced Ahr, Cyp1a1, and Cyp1b1 transcription in Nrf2+/+ MEFs but not in Nrf2-/- MEFs. Reporter analysis and chromatin immunoprecipitation assay revealed that NRF2 directly binds to one antioxidant response element (ARE) found in the -230-bp region of the promoter of Ahr. Since AHR negatively controls adipocyte differentiation, we postulated that NRF2 would inhibit adipogenesis through the interaction with the AHR pathway. Nrf2-/- MEFs showed markedly accelerated adipogenesis upon stimulation, while Keap1-/- MEFs (which exhibit higher NRF2 signaling) differentiated slowly compared to their congenic wild-type MEFs. Ectopic expression of Ahr and dominant-positive Nrf2 in Nrf2-/- MEFs also substantially delayed differentiation. Thus, NRF2 directly modulates AHR signaling, highlighting bidirectional interactions of these pathways.

MeSH Terms
Adaptor Proteins, Signal Transducing/genetics,metabolism Adipocytes/physiology Adipogenesis/physiology Animals Cell Differentiation/physiology Cells, Cultured Cytoskeletal Proteins/genetics,metabolism Fibroblasts/cytology,physiology Gene Expression Regulation Genes, Reporter Kelch-Like ECH-Associated Protein 1 Mice Mice, Inbred C57BL Mice, Knockout NF-E2-Related Factor 2/genetics,metabolism Promoter Regions, Genetic Receptors, Aryl Hydrocarbon/genetics,metabolism Signal Transduction/physiology Transcription, Genetic
Chemicals
Adaptor Proteins, Signal Transducing Cytoskeletal Proteins Keap1 protein, mouse Kelch-Like ECH-Associated Protein 1 NF-E2-Related Factor 2 Receptors, Aryl Hydrocarbon
Authors & Affiliations
8 authors, click to expand affiliations / ORCID
Shin Soona
Department of Pharmacology and Molecular Sciences, School of Medicine, The Johns Hopkins University, Baltimore, MD 21205, USA.
Wakabayashi Nobunao
Misra Vikas
Biswal Shyam
Lee Gum Hwa
Agoston Elin S
Yamamoto Masayuki
Kensler Thomas W
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Article Info
Journal
Molecular and cellular biology
Abbr.
Mol Cell Biol
ISSN
0270-7306
Published
2007-10-00
Epub
2007-00-20
Pages
7188-97
Language
English
Region
United States
NLM ID
8109087
PMCID
PMC2168916
Subset
IM
Grants
NHLBI NIH HHS · R01 HL081205-03 · United States
NCI NIH HHS · R01 CA094076 · United States
NHLBI NIH HHS · R01 HL081205 · United States
NIEHS NIH HHS · ES03819 · United States
NHLBI NIH HHS · HL081205 · United States
NCI NIH HHS · CA94076 · United States
NIEHS NIH HHS · P30 ES003819 · United States
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