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Mechanisms of oncogene cooperation: activation and inactivation of a growth antagonist
M M Ragozzino1, A Kuo, J DeGregori
1Center for Cancer Research, Massachusetts Institute of Technology, Cambridge 02139.
Abstract:
Gene transfer experiments have defined limitations with regard to the ability of individual oncogenes to transform cultured cells to a tumorigenic state. The stable transformation of REF52 cells by either the ras or sis oncogenes requires the continuous expression of a second collaborating oncogene, such as adenovirus-5 E1A or SV40 large T-antigen. Our studies suggest that the function of the nuclear collaborators is to antagonize dominant growth controls which limit the ability of REF52 cells to proliferate in response to mitogenic stimuli.
Insights
Oncogenes like ras and sis need collaborating oncogenes to make cells tumorigenic. Nuclear collaborators overcome growth limits, enabling cell proliferation and tumor formation.
Area of Science:
- Molecular biology
- Cellular biology
- Cancer research
Background:
- Individual oncogenes have limited ability to induce tumorigenic transformation in cultured cells.
- Stable transformation often requires cooperation between multiple oncogenes.
- Previous studies highlighted the necessity of collaborating oncogenes for cell transformation.
Purpose of the Study:
- To investigate the role of collaborating oncogenes in cellular transformation.
- To understand how oncogenes cooperate to overcome cellular growth limitations.
- To elucidate the mechanism by which nuclear collaborators enable sustained cell proliferation.
Main Methods:
- Gene transfer experiments were performed using REF52 cells.
- The oncogenes ras and sis were introduced into REF52 cells.
- The expression of collaborating oncogenes, such as adenovirus-5 E1A or SV40 large T-antigen, was assessed.
Main Results:
- Stable transformation of REF52 cells by ras or sis oncogenes necessitated continuous expression of a second collaborating oncogene.
- Nuclear collaborators were found to antagonize dominant growth controls.
- These collaborators facilitate REF52 cell proliferation in response to mitogenic stimuli.
Conclusions:
- Cooperation between oncogenes is essential for overcoming cellular growth constraints.
- Nuclear collaborators play a critical role in promoting sustained cell proliferation and tumorigenesis.
- Understanding these collaborative mechanisms is key to developing targeted cancer therapies.