期刊
BMC CANCER
卷 7, 期 -, 页码 -出版社
BMC
DOI: 10.1186/1471-2407-7-59
关键词
-
类别
资金
- NCI NIH HHS [P30-CA82103, P30 CA082103, R01 CA036773, P50-CA58207, R01-CA71468, P50 CA058207, R01-CA36773, R01 CA071468] Funding Source: Medline
- NIA NIH HHS [R01-AG020521, R01 AG020521] Funding Source: Medline
Background: Signaling pathways that converge on two different transcription factor complexes, NF kappa B and AP-1, have been identified in estrogen receptor (ER)-positive breast cancers resistant to the antiestrogen, tamoxifen. Methods: Two cell line models of tamoxifen-resistant ER-positive breast cancer, MCF7/HER2 and BT474, showing increased AP-1 and NF kappa B DNA-binding and transcriptional activities, were studied to compare tamoxifen effects on NF kappa B and AP-1 regulated reporter genes relative to tamoxifen-sensitive MCF7 cells. The model cell lines were treated with the IKK inhibitor parthenolide (PA) or the proteasome inhibitor bortezomib (PS341), alone and in combination with tamoxifen. Expression microarray data available from 54 UCSF node-negative ER-positive breast cancer cases with known clinical outcome were used to search for potential genes signifying upregulated NF kappa B and AP-1 transcriptional activity in association with tamoxifen resistance. The association of these genes with patient outcome was further evaluated using node-negative ER-positive breast cancer cases identified from three other published data sets (Rotterdam, n = 209; Amsterdam, n = 68; Basel, n = 108), each having different patient age and adjuvant tamoxifen treatment characteristics. Results: Doses of parthenolide and bortezomib capable of sensitizing the two endocrine resistant breast cancer models to tamoxifen were capable of suppressing NF kappa B and AP-1 regulated gene expression in combination with tamoxifen and also increased ER recruitment of the transcriptional co-repressor, NCoR. Transcript profiles from the UCSF breast cancer cases revealed three NF kappa B and AP-1 upregulated genes - cyclin D1, uPA and VEGF - capable of dichotomizing node-negative ER-positive cases into early and late relapsing subsets despite adjuvant tamoxfien therapy and most prognostic for younger age cases. Across the four independent sets of node-negative ER-positive breast cancer cases (UCSF, Rotterdam, Amsterdam, Basel), high expression of all three NF kappa B and AP-1 upregulated genes was associated with earliest metastatic relapse. Conclusion: Altogether, these findings implicate increased NF kappa B and AP-1 transcriptional responses with tamoxifen resistant breast cancer and early metastatic relapse, especially in younger patients. These findings also suggest that agents capable of preventing NF kappa B and AP-1 gene activation may prove useful in restoring the endocrine responsiveness of such high-risk ER-positive breast cancers.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据