Induction of UDP-glucuronosyltransferase 2B15 gene expression by the major active metabolites of tamoxifen, 4-hydroxytamoxifen and endoxifen, in breast cancer cells.

Drug Metabolism and Disposition : the Biological Fate of Chemicals
Apichaya ChanawongRoss A McKinnon

Abstract

We previously reported upregulation of UGT2B15 by 17β-estradiol in breast cancer MCF7 cells via binding of the estrogen receptor α (ERα) to an estrogen response unit (ERU) in the proximal UGT2B15 promoter. In the present study, we show that this ERα-mediated upregulation was significantly reduced by two ER antagonists (fulvestrant and raloxifene) but was not affected by a third ER antagonist, 4-hydroxytamoxifen (4-OHTAM), a major active tamoxifen (TAM) metabolite. Furthermore, we found that, similar to 17β-estradiol, 4-OHTAM and endoxifen (another major active TAM metabolite) elevated UGT2B15 mRNA levels, and that this stimulation was significantly abrogated by fulvestrant. Further experiments using 4-OHTAM revealed a critical role for ERα in this regulation. Specifically; knockdown of ERα expression by anti-ERα small interfering RNA reduced the 4-OHTAM-mediated induction of UGT2B15 expression; 4-OHTAM activated the wild-type but not the ERU-mutated UGT2B15 promoter; and chromatin immunoprecipitation assays showed increased ERα occupancy at the UGT2B15 ERU in MCF7 cells upon exposure to 4-OHTAM. Together, these data indicate that both 17β-estradiol and the antiestrogen 4-OHTAM upregulate UGT2B15 in MCF7 cells via the same ERα-s...Continue Reading

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Citations

Dec 14, 2016·Pharmacological Research : the Official Journal of the Italian Pharmacological Society·Peter I MackenzieJohn O Miners
Feb 7, 2019·Physiological Reviews·Robyn MeechPeter I Mackenzie
Apr 14, 2017·The Journal of Pharmacology and Experimental Therapeutics·Apichaya ChanawongRobyn Meech
May 5, 2020·Glycobiology·Krzysztof MikolajczykMarcin Czerwinski
Feb 13, 2020·British Journal of Cancer·Eric P AllainChantal Guillemette

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