发明名称 |
Coactivators in the diagnosis and treatment of breast cancer |
摘要 |
This invention relates to the AIB1 protein as a coactivator that potentiates the transcriptional activity of nuclear hormone receptors. The gene is amplified in a subset of human breast cancers. One splice variant of AIB1 transcribes a mRNA that lacks the exon 3 sequence. Delta3-AIB1 mRNA encodes a 130 kDa protein that lacks the N-terminal basic helix-loop-helix and a portion of the PAS dimerization domain. This 130 kDa protein was detected in MCF-7 breast cancer cells at levels 5-10% of the full length protein, whereas in non transformed mammary epithelium lines the Delta3-AIB1 protein is present at significantly lower levels compared to the full length AIB1. The abundance of Delta3-AIB1 mRNA is increased in human breast cancer specimens relative to that in normal breast tissue. Functional reporter gene assays revealed that the ability of Delta3-AIB1 to promote transcription mediated by the estrogen or progesterone receptors was significantly greater than that of the full-length protein. The Delta3-AIB1 isoform was also more effective than AIB1 in promoting transcription induced by epidermal growth factor. Thus, over expression of Delta3-AIB1 plays an important role in sensitizing breast tumor cells to hormone or growth factor stimulation.
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申请公布号 |
US2004259114(A1) |
申请公布日期 |
2004.12.23 |
申请号 |
US20040751113 |
申请日期 |
2004.01.05 |
申请人 |
RIEGEL ANNA T.;REITER RONALD;WELLSTEIN ANTON |
发明人 |
RIEGEL ANNA T.;REITER RONALD;WELLSTEIN ANTON |
分类号 |
A61K38/00;C07H21/04;C07K14/47;C07K16/18;C12Q1/68;G01N33/574;(IPC1-7):C12Q1/68;C07K14/72 |
主分类号 |
A61K38/00 |
代理机构 |
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