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- W1972279589 abstract "Abstract Histone deacetylase inhibitors (HDACI) are promising anticancer agents and their use in combination with conventional anticancer drugs is currently under investigation. We previously reported cell line–specific upregulation of ABCG2, a multidrug resistance transporter shown to control oral bioavailability and CNS penetration, by the HDACI romidepsin, although the precise mechanism in a particular cell line remains to be determined. The aryl hydrocarbon receptor (AhR) is a ligand-dependent transcription factor that can be activated by numerous environmental contaminants and has been shown to be a client protein of heat shock protein 90 (Hsp90). A xenobiotic response element was defined in the ABCG2 promoter and was shown to mediate AhR signaling. Activated AhR was found to be associated with the ABCG2 promoter only in cell line models that respond to romidepsin with ABCG2 upregulation. Our data suggest that romidepsin acetylated Hsp70 and inhibited the chaperone function of Hsp90, thereby allowing the dissociation of AhR from Hsp90. The dissociation of AhR from Hsp90 may be a prerequisite for the differential upregulation of ABCG2 by romidepsin. Increasing our understanding of the mechanism(s) governing differential upregulation of ABCG2 in response to romidepsin could provide an insight into strategies needed to tackle resistance to HDACIs in cancer therapeutics. Mol Cancer Res; 9(4); 516–27. ©2011 AACR." @default.
- W1972279589 created "2016-06-24" @default.
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- W1972279589 date "2011-04-01" @default.
- W1972279589 modified "2023-10-17" @default.
- W1972279589 title "Upregulation of ABCG2 by Romidepsin via the Aryl Hydrocarbon Receptor Pathway" @default.
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- W1972279589 doi "https://doi.org/10.1158/1541-7786.mcr-10-0270" @default.
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