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E1AF, an ets-oncogene family transcription factor
Masanobu Shindoh1, Fumihiro Higashino, Takao Kohgo
1Department of Oral Pathobiological Science, Hokkaido University Graduate School of Dental Medicine, N 13 W7, Kita-ku, Sapporo 060-8586, Japan. mshindoh@den.hokudai.ac.jp
Cancer Letters
|October 27, 2004
Summary
E1AF, a transcription factor, promotes cancer metastasis by upregulating matrix metalloproteinase genes. It also regulates cell cycle arrest and telomerase activity, suggesting complex roles in cancer progression.
Area of Science:
- Molecular Biology
- Cancer Research
- Cell Biology
Background:
- E1AF (ets-oncogene family transcription factor) drives cancer cell invasion and metastasis by upregulating matrix metalloproteinase (MMP) genes.
- E1AF is implicated in cell motility via hepatocyte growth factor (HGF) signaling and can induce cell cycle arrest.
- EWS/ETS fusions are common in Ewing's sarcoma, with EWS/ETS activating telomerase by upregulating hTERT.
Purpose of the Study:
- To investigate the role of EWS/E1AF in hTERT transcription.
- To understand the mechanism by which EWS/ETS influences telomerase activity.
Main Methods:
- DNA immunoprecipitation (DNA-IP) assays were used to assess EWS/E1AF binding to the hTERT promoter.
- Analysis of EWS/E1AF responsiveness to EWS/ETS fusion proteins.
Main Results:
- EWS/E1AF complexes were found to bind to the hTERT promoter.
- Mutations in the Ets binding site (EBS) did not alter responsiveness to EWS/E1AF, indicating a co-activator role.
- EWS/ETS functions as a co-activator for TERT transcription.
Conclusions:
- EWS/ETS acts as a transcriptional co-factor, highlighting the importance of transcription factor interactions in regulating gene expression.
- Findings suggest a novel regulatory pathway involving EWS/ETS in TERT transcription and potentially in Ewing's sarcoma pathogenesis.