Estrogen receptor alpha 46 is reduced in tamoxifen resistant breast cancer cells and re-expression inhibits cell proliferation and estrogen receptor alpha 66-regulated target gene transcription.
Estrogen receptor alpha 46 is reduced in tamoxifen resistant breast cancer cells and re-expression inhibits cell proliferation and estrogen receptor alpha 66-regulated target gene transcription.
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DOI:
10.1016/j.mce.2010.03.013
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发表时间:
2010-07-29
影响因子:
4.1
通讯作者:
Magnusen, Joan E.
中科院分区:
文献类型:
--
作者:
Klinge, Carolyn M.;Riggs, Krista A.;Wickramasinghe, Nalinie S.;Emberts, Celia G.;McConda, David B.;Barry, Parul N.;Magnusen, Joan E.
Resistance to endocrine therapy is a major clinical problem in breast cancer. The role of ERα splice variants in endocrine resistance is largely unknown. We observed reduced protein expression of an N-terminally truncated ERα46 in endocrine- resistant LCC2, LCC9, and LY2 compared to MCF-7 breast cancer cells. Transfection of LCC9 and LY2 cells with hERα46 partially restored growth inhibition by TAM. Overexpression of hERα46 in MCF-7 cells reduced estradiol (E2)-stimulated endogenous pS2, Cyclin D1, nuclear respiratory factor-1 (NRF-1), and progesterone receptor transcription. Expression of oncomiR miR-21 was lower in TAM-resistant LCC9 and LY2 cells compared to MCF-7 cells. Transfection with ERα46 altered the pharmacology of E2 regulation of miR-21 expression from inhibition to stimulation, consistent with the hypothesis that hERα46 inhibits ERα activity. Established miR-21 targets PTEN and PDCD4 were reduced in ERα46-transfected, E2-treated MCF-7 cells. In conclusion, ERα46 appears to enhance endocrine responses by inhibiting selected ERα66 responses.
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影响因子:
3.5
作者:
Kulakosky, PC;McCarty, MA;Klinge, CM
通讯作者:
Klinge, CM
DOI:
10.1073/pnas.0831079100
发表时间:
2003-04-15
影响因子:
11.1
作者:
Li, L;Haynes, MP;Bender, JR
通讯作者:
Bender, JR
DOI:
10.1016/j.jsbmb.2008.03.032
发表时间:
2008-05-01
影响因子:
4.1
作者:
Carreau, Charlotte;Flouriot, Gilles;Potier, Mylene
通讯作者:
Potier, Mylene
影响因子:
6.1
作者:
Jiang Hai-ping;Teng Rong-yue;Teng Li-song
通讯作者:
Teng Li-song
DOI:
10.1093/toxsci/kfn141
发表时间:
2008-10
期刊:
Toxicological sciences : an official journal of the Society of Toxicology
影响因子:
--
作者:
Sotoca AM;van den Berg H;Vervoort J;van der Saag P;Ström A;Gustafsson JA;Rietjens I;Murk AJ
通讯作者:
Murk AJ