NDLI: Antagonism of Aryl Hydrocarbon Receptor Signaling by 6,2′,4′-TrimethoxyflavoneS⃞

Content Provider	PubMed Central
Author	Murray, Iain A. Flaveny, Colin A. Dinatale, Brett C. Chairo, Chris R. Schroeder, Jennifer C. Ann, Kusnadi Perdew, Gary H.
Abstract	The aryl hydrocarbon receptor (AHR) is regarded as an important homeostatic transcriptional regulator within physiological and pathophysiological processes, including xenobiotic metabolism, endocrine function, immunity, and cancer. Agonist activation of the AHR is considered deleterious based on toxicological evidence obtained with environmental pollutants, which mediate toxic effects through AHR. However, a multitude of plant-derived constituents, e.g., polyphenols that exhibit beneficial properties, have also been described as ligands for the AHR. It is conceivable that some of the positive aspects of such compounds can be attributed to suppression of AHR activity through antagonism. Therefore, we conducted a dioxin response element reporter-based screen to assess the AHR activity associated with a range of flavonoid compounds. Our screen identified two flavonoids (5-methoxyflavone and 7,4′-dimethoxyisoflavone) with previously unidentified AHR agonist potential. In addition, we have identified and characterized 6,2′,4′-trimethoxyflavone (TMF) as an AHR ligand that possesses the characteristics of an antagonist having the capacity to compete with agonists, such as 2,3,7,8-tetrachlorodibenzo-p-dioxin and benzo[a]pyrene, thus effectively inhibiting AHR-mediated transactivation of a heterologous reporter and endogenous targets, e.g., CYP1A1, independent of cell lineage or species. Furthermore, TMF displays superior action by virtue of having no partial agonist activity, in contrast to other documented antagonists, e.g., α-napthoflavone, which are partial weak agonists. TMF also exhibits no species or promoter dependence with regard to AHR antagonism. TMF therefore represents an improved tool allowing for more precise dissection of AHR function in the absence of any conflicting agonist activity.
Related Links	http://dx.doi.org/10.1124/jpet.109.158261
Ending Page	144
Page Count	10
Starting Page	135
File Format	PDF
ISSN	00223565
e-ISSN	15210103
Journal	The Journal of Pharmacology and Experimental Therapeutics
Issue Number	1
Volume Number	332
Language	English
Publisher	The American Society for Pharmacology and Experimental Therapeutics
Publisher Date	2010-01-01
Access Restriction	Open
Rights Holder	The American Society for Pharmacology and Experimental Therapeutics
Subject Keyword	Molecular Medicine Pharmacology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Molecular Medicine Pharmacology

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