p53 induces senescence through Lamin A/C stabilization-mediated nuclear deformation
Min-Ho Yoon1, So-Mi Kang1, Su-Jin Lee1
1Department of Molecular Biology, College of Natural Science, Pusan National University, Busan, 46241, Republic of Korea.
Cell Death & Disease
|February 8, 2019
Summary
The tumor suppressor p53 stabilizes Lamin A/C, which reduces BMI-1/MEL-18 and induces p16/INK4A expression, promoting cellular senescence. This p53-Lamin A/C network is crucial for p16-mediated senescence.
Area of Science:
- Cellular senescence
- Tumor suppression
- Molecular biology
Background:
- p53 and p16/INK4A are critical for tumor suppression via cellular senescence.
- The precise molecular link between p53 and p16-mediated senescence remains unclear.
Purpose of the Study:
- To elucidate the molecular mechanism connecting p53 and p16/INK4A in cellular senescence.
- To investigate the role of Lamin A/C in mediating p53's effect on p16 expression.
Main Methods:
- Investigated the interaction between p53 and Lamin A/C.
- Assessed the impact of Lamin A/C stabilization on BMI-1 and MEL-18 (Polycomb repressor complex 1, PRC1) levels.
- Analyzed p16/INK4A promoter activity and expression in response to p53 and Lamin A/C manipulation.
Main Results:
- p53 directly interacts with and stabilizes Lamin A/C.
- Stabilized Lamin A/C promotes the degradation of BMI-1 and MEL-18, which normally repress p16.
- p53 induces p16 expression via Lamin A/C stabilization, and this effect is abolished by Lamin A/C elimination.
- This mechanism is relevant for selective senescence induction in non-stem cells during differentiation.
Conclusions:
- A novel p53-Lamin A/C regulatory network is identified.
- This network is essential for p53-induced p16/INK4A expression and subsequent cellular senescence.
- The findings highlight Lamin A/C as a key mediator in p53-driven tumor suppression.
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