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Survivin initiates cell cycle entry by the competitive interaction with Cdk4/p16(INK4a) and Cdk2/cyclin E complex
1Basic Technology Research Laboratory, Daiichi Pharamceutical Co. Ltd., Tokyo R&D Center, Japan.
Abstract:
Survivin is observed uniquely in tumor cells and developmental cells, which undergo either inappropriate or programmed cell growth. In the current study, we investigated the influence of Survivin on cell cycle. Overexpression of Survivin resulted in accelerated S phase shift, resistance to G1 arrest, and activated Cdk2/Cyclin E complex leading Rb phosphorylation. In addition, nuclear translocation of Survivin followed by an interaction with Cdk4 was detected. Interestingly, Survivin nuclear translocation coincided with S phase shift, and prevention of nuclear transport suppressed Survivin nuclear translocation and S phase shift. Further, we also observed that Survivin competitively interacted with the Cdk4/p16(INK4a) complex in a cell free system and in vivo. These results suggest that Survivin initiates the cell cycle entry as a result of nuclear translocation followed by an interaction with Cdk4.
Insights
Survivin protein promotes cell cycle entry by translocating to the nucleus and interacting with Cdk4. This process accelerates the S phase shift and aids cell growth.
Area of Science:
- Molecular Biology
- Cell Biology
- Cancer Biology
Background:
- Survivin is uniquely expressed in tumor and developmental cells.
- These cells exhibit programmed or inappropriate cell growth.
- The role of Survivin in cell cycle regulation requires further investigation.
Purpose of the Study:
- To investigate the influence of Survivin on the cell cycle.
- To elucidate the mechanism by which Survivin affects cell cycle progression.
Main Methods:
- Overexpression of Survivin in cells.
- Analysis of cell cycle phases (G1 arrest, S phase).
- Investigation of protein-protein interactions (Survivin, Cdk4, p16INK4a, Cdk2/Cyclin E).
- Assessment of nuclear translocation of Survivin.
Main Results:
- Survivin overexpression accelerated S phase and conferred resistance to G1 arrest.
- Activated Cdk2/Cyclin E complex led to Rb phosphorylation.
- Nuclear translocation of Survivin coincided with S phase shift.
- Survivin competitively interacted with the Cdk4/p16INK4a complex.
Conclusions:
- Survivin initiates cell cycle entry through nuclear translocation.
- Survivin interacts with Cdk4, promoting cell cycle progression.
- The findings provide insights into Survivin's role in cell proliferation and cancer development.