The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 2007
Filed:
Jan. 05, 2004
Anna T. Riegel, Washington, DC (US);
Ronald Reiter, Sølzburg, AT;
Anton Wellstein, Washington, DC (US);
Anna T. Riegel, Washington, DC (US);
Ronald Reiter, Sølzburg, AT;
Anton Wellstein, Washington, DC (US);
Georgetown University, Washington, DC (US);
Abstract
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. Δ3-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 Δ3-AIB1 protein is present at significantly lower levels compared to the full length AIB1. The abundance of Δ3-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 Δ3-AIB1 to promote transcription mediated by the estrogen or progesterone receptors was significantly greater than that of the full-length protein. The Δ3-AIB1 isoform was also more effective than AIB1 in promoting transcription induced by epidermal growth factor. Thus, over expression of Δ3-AIB1 plays an important role in sensitizing breast tumor cells to hormone or growth factor stimulation.