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Methods for Evaluating the Role of c-Fos and Dusp1 in Oncogene Dependence
Published on: January 7, 2019
Leukemia suppressor function of Egr-1 is dependent on transforming oncogene
J D Gibbs1, D A Liebermann, B Hoffman
1Fels Institute for Cancer Research and Molecular Biology, Temple University, Philadelphia, PA 19140, USA.
Leukemia
|July 25, 2008
Summary
The transcription factor Egr-1 suppresses certain leukemias by restoring cell differentiation. However, Egr-1
Area of Science:
- Oncology
- Molecular Biology
- Cell Differentiation
Background:
- Deregulation of oncogenes like c-Myb, E2F-1, and c-Myc disrupts myeloid leukemia cell differentiation.
- These oncogenes promote leukemia development in vivo.
- The transcription factor Egr-1 can counteract differentiation blocks caused by c-Myc and E2F-1.
Purpose of the Study:
- To investigate if Egr-1 can also overcome differentiation blocks and suppress leukemia caused by deregulated c-Myb.
- To understand the relationship between Egr-1's tumor suppressor function and the specific oncogene involved.
Main Methods:
- Ectopic expression of Egr-1 in M1 myeloid leukemia cells with deregulated c-Myb.
- Assessment of terminal differentiation.
- Evaluation of leukemic phenotype in vivo (nude mice).
Main Results:
- Egr-1 partially abrogated the differentiation block caused by c-Myb.
- Egr-1 failed to suppress the leukemic phenotype driven by c-Myb.
- Egr-1's effectiveness as a leukemia suppressor is dependent on the specific oncogene (dominant over c-Myc/E2F-1, but not c-Myb).
Conclusions:
- Egr-1's leukemia suppressor function is not solely determined by the stage at which an oncogene blocks differentiation.
- The tumor suppressor activity of Egr-1 is specific to the oncogene driving the leukemia.
- The molecular characteristics of genetic lesions in leukemia influence the efficacy of tumor suppressors like Egr-1.
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