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Transcriptional regulation of the p73 gene by Nrf-2 and promoter CpG methylation in human breast cancer.


ABSTRACT: To understand the transcriptional regulation of p73 by promoter methylation and Nrf-2 in breast carcinogenesis, ChIP assay indicated that Nrf-2 can bind to both promoters and can activate the transcription of TAp73 and ?Np73 in MCF-7 cell line, knockdown of Nrf-2 gene resulted in an abrogation of TAp73 and ?Np73 expression in the cells transfected with sh-Nrf-2 as well as Nrf-2 knock out mouse model. However, we found Nrf-2 induced ?Np73 expression was abolished with 5-aza-dC treatment, thus lead to a down-regulated ?Np73 and an up-regulated TAp73 expression in breast cancer cells lines. Consistent with this model, we detected decreased TAp73 and increased ?Np73 expression in breast cancer tissue, along with increased TAp73 but decreased ?Np73 expression in corresponding surrounding noncancerous tissues (NCTs) in a breast cancer tissue assay. A significant inverse correlation was found between TAp73 and ?Np73 expression in the above tissue-array (P = 0.047) and validated in another set consisting of 128 breast cancer tumor tissue (P = 0.034). Taken together, our findings suggest that Nrf-2 and promoter methylation cooperatively govern the transcriptional regulation of p73, and unbalanced expression of TAp73 and ?Np73 expression plays a critical role in breast cancer development.

SUBMITTER: Lai J 

PROVIDER: S-EPMC4196172 | biostudies-literature | 2014 Aug

REPOSITORIES: biostudies-literature

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Transcriptional regulation of the p73 gene by Nrf-2 and promoter CpG methylation in human breast cancer.

Lai Jing J   Nie Weiwei W   Zhang Wenwen W   Wang Yucai Y   Xie Ruilian R   Wang Yanru Y   Gu Jun J   Xu Jing J   Song Wei W   Yang Fang F   Huang Guichun G   Cao Peng P   Guan Xiaoxiang X  

Oncotarget 20140801 16


To understand the transcriptional regulation of p73 by promoter methylation and Nrf-2 in breast carcinogenesis, ChIP assay indicated that Nrf-2 can bind to both promoters and can activate the transcription of TAp73 and ΔNp73 in MCF-7 cell line, knockdown of Nrf-2 gene resulted in an abrogation of TAp73 and ΔNp73 expression in the cells transfected with sh-Nrf-2 as well as Nrf-2 knock out mouse model. However, we found Nrf-2 induced ΔNp73 expression was abolished with 5-aza-dC treatment, thus lea  ...[more]

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