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c-myb effects on kinetic events during MEL cell differentiation
R Danish1, O el-Awar, B L Weber
1Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor 48109-0668.
Oncogene
|May 1, 1992
Summary
High c-myb gene expression blocks mouse erythroleukemia cell differentiation late in the process. A late decrease in c-myb is necessary for cells to differentiate and stop proliferating.
Area of Science:
- * Molecular Biology
- * Cell Differentiation
- * Gene Regulation
Background:
- * Friend mouse erythroleukemia (MEL) cells undergo differentiation when treated with dimethylsulfoxide (DMSO).
- * Differentiation involves a biphasic decrease in c-myb messenger RNA (mRNA) levels.
- * Constitutive expression of c-myb has been shown to inhibit this differentiation process.
Purpose of the Study:
- * To pinpoint the specific stage at which Myb protein inhibits MEL cell differentiation.
- * To investigate the role of c-myb downregulation in the later stages of erythroid differentiation.
Main Methods:
- * Transfection of MEL cells with a human c-myb construct regulated by the beta-globin promoter and enhancers.
- * Induction of differentiation using DMSO in culture media.
- * Monitoring of exogenous c-myb expression and phenotypic differentiation markers.
Main Results:
- * Transfected MEL cells exhibited delayed expression of exogenous c-myb (3-5 days post-DMSO induction).
- * These c-myb-transformed clones failed to show differentiation markers and continued proliferation.
- * Early differentiation events, including chromatin condensation, were not blocked by constitutive c-myb expression.
Conclusions:
- * A late reduction in c-myb levels is essential for MEL cell differentiation to proceed.
- * c-myb appears to act late in the differentiation pathway, not affecting early commitment events.
- * These findings clarify the role of c-myb in erythroid differentiation timing.