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- W2116794457 abstract "The aryl hydrocarbon receptor (AHR) repressor (AHRR) inhibits AHR-mediated transcription and has been associated with reproductive dysfunction and tumorigenesis in humans. Previous studies have characterized the repressor function of AHRRs from mice and fish, but the human AHRR ortholog (AHRR(715)) appeared to be nonfunctional in vitro. Here, we report a novel human AHRR cDNA (AHRRDelta8) that lacks exon 8 of AHRR(715). AHRRDelta8 was the predominant AHRR form expressed in human tissues and cell lines. AHRRDelta8 effectively repressed AHR-dependent transactivation, whereas AHRR(715) was much less active. Similarly, AHRRDelta8, but not AHRR(715), formed a complex with AHR nuclear translocator (ARNT). Repression of AHR by AHRRDelta8 was not relieved by overexpression of ARNT or AHR coactivators, suggesting that competition for these cofactors is not the mechanism of repression. AHRRDelta8 interacted weakly with AHR but did not inhibit its nuclear translocation. In a survey of transcription factor specificity, AHRRDelta8 did not repress the nuclear receptor pregnane X receptor or estrogen receptor alpha but did repress hypoxia-inducible factor (HIF)-dependent signaling. AHRRDelta8-Pro(185) and -Ala(185) variants, which have been linked to human reproductive disorders, both were capable of repressing AHR or HIF. Together, these results identify AHRRDelta8 as the active form of human AHRR and reveal novel aspects of its function and specificity as a repressor." @default.
- W2116794457 created "2016-06-24" @default.
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- W2116794457 date "2009-07-01" @default.
- W2116794457 modified "2023-09-23" @default.
- W2116794457 title "The Active Form of Human Aryl Hydrocarbon Receptor (AHR) Repressor Lacks Exon 8, and Its Pro<sup>185</sup> and Ala<sup>185</sup> Variants Repress both AHR and Hypoxia-Inducible Factor" @default.
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- W2116794457 doi "https://doi.org/10.1128/mcb.00206-09" @default.
- W2116794457 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2698758" @default.
- W2116794457 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19380484" @default.
- W2116794457 hasPublicationYear "2009" @default.
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