期刊
TOXICOLOGY LETTERS
卷 120, 期 1-3, 页码 1-7出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/S0378-4274(01)00301-0
关键词
AhR; ER alpha; crosstalk; antiestrogenicity; breast cancer
类别
资金
- NCI NIH HHS [CA64081] Funding Source: Medline
- NIEHS NIH HHS [ES09106] Funding Source: Medline
The aryl hydrocarbon receptor (AhR) is a ligand-activated nuclear transcription factor that mediates responses to toxic halogenated aromatic toxins such as 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), polynuclear aromatic hydrocarbons, combustion products, and numerous phytochemicals such as flavonoids and indole-3-carbinol (I3C). The nuclear AhR complex is a heterodimer containing the AhR and AhR nuclear translocator (Arnt) proteins, and the molecular mechanism of AhR action is associated with binding of the heterodimer to dioxin responsive elements (DREs) in regulatory regions of Ah-responsive genes. TCDD, a 'xenodioxin', is a multi-site carcinogen in several species and possibly in humans, whereas natural AhR ligands including I3C and flavonoids tend to protect against cancer. Both TCDD and phytochemicals inhibit estrogen-induced breast and endometrial cancer, and the molecular mechanisms of this common response will be described. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.
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