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- W2095280500 abstract "The estrogen receptor (ER) is a major prognostic and therapeutic marker that is expressed in nearly 75% of breast tumors. We have previously shown that the presence of inflammatory mediators can alter the genomic function of the estrogen receptor (ER) in a gene specific manner. In particular, 17β-estradiol (E2) works in combination with the pro-inflammatory cytokines to enhance the expression of a number of pro-survival factors, including the Inhibitor of Apoptosis (IAP) family member, cIAP2. Here we confirm that mRNA and protein levels for cIAP2, but not the related family members cIAP1 and XIAP, are highly up-regulated in MCF-7 breast cancer cells by E2 and cytokines. Similar regulation of cIAP2 is evident in other ER positive but not ER negative cell lines. In agreement with its role as a pro-survival factor, cIAP2 is highly expressed in a subset of invasive breast carcinomas but not in normal breast tissue or ductal carcinoma in situ. Antagonizing IAPs with mimetics of SMAC, which is a known endogenous IAP antagonist, or knockdown of IAPs by siRNA led to greater cell death by TNFα and prevented E2 from promoting cell survival. In addition, a SMAC mimetic reversed TNFα resistance in ER positive breast cancer cells that express high levels of endogenous IAPs. In summary, our findings indicate a new mechanism by which E2 allows breast cancer cells to evade cell death and suggest that an antagonist of IAPs may be a potential therapeutic option for a subset of ER positive breast tumors." @default.
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- W2095280500 date "2010-06-01" @default.
- W2095280500 modified "2023-09-27" @default.
- W2095280500 title "Estrogen Promotes Breast Cancer Cell Survival in an Inhibitor of Apoptosis (IAP)-dependent Manner" @default.
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- W2095280500 doi "https://doi.org/10.1007/s12672-010-0018-6" @default.
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