Oscillations by the p53-Mdm2 feedback loop.
@article{Lahav2008OscillationsBT,
title={Oscillations by the p53-Mdm2 feedback loop.},
author={Galit Lahav},
journal={Advances in experimental medicine and biology},
year={2008},
volume={641},
pages={
28-38
}
}The p53 network is perhaps the most important pathway involved in preventing the initiation of cancer, p53 levels and activity are upregulated in response to various stresses including DNA damage, hypoxia, and oncogene activation. Active p53 initiates different transcriptional programs that result in cell cycle arrest, cellular senescence or apoptosis. p53 also activates the transcription of Mdm2, which in turns target p53 for degradation, therefore creating a negative feedback loop on p53…
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References
SHOWING 1-10 OF 57 REFERENCES
Dynamics of the p53-Mdm2 feedback loop in individual cells
- BiologyNature Genetics
- 2004
It is found that p53 was expressed in a series of discrete pulses after DNA damage, and it is suggested that the p53-Mdm2 feedback loop generates a 'digital' clock that releases well-timed quanta of p53 until damage is repaired or the cell dies.
The p53 pathway: positive and negative feedback loops
- BiologyOncogene
- 2005
The p53 pathway responds to stresses that can disrupt the fidelity of DNA replication and cell division by activation of the p53 protein as a transcription factor that initiates a program of cell cycle arrest, cellular senescence or apoptosis.
Regulation of p53 stability by Mdm2
- BiologyNature
- 1997
It is shown that interaction with Mdm2 can also result in a large reduction in p53 protein levels through enhanced proteasome-dependent degradation, which may contribute to the maintenance of low p53 concentrations in normal cells.
p53-Mdm2 loop controlled by a balance of its feedback strength and effective dampening using ATM and delayed feedback.
- BiologySystems biology
- 2005
This approach yields an improved understanding of the global dynamics and bifurcation structure of the time-delayed, negative feedback model and allows for predictions of the behaviour of the p53 system under different perturbations.
Generation of oscillations by the p53-Mdm2 feedback loop: a theoretical and experimental study.
- BiologyProceedings of the National Academy of Sciences of the United States of America
- 2000
A simple mathematical model is presented suggesting that, under certain circumstances, oscillations in p53 and Mdm2 protein levels can emerge in response to a stress signal, and oscillations may allow cells to repair their DNA without risking the irreversible consequences of continuous excessive p53 activation.
Steady States and Oscillations in the p53/Mdm2 Network
- BiologyCell cycle
- 2005
A mathematical model of p53 oscillations based on positive and negative feedbacks in the p53/Mdm2 network is developed, which guarantees an all-or-none response to damage.
Mdm2 promotes the rapid degradation of p53
- BiologyNature
- 1997
It is proposed that the Mdm2-promoted degradation of p53 provides a new mechanism to ensure effective termination of the p53 signal.
Rapid ATM-dependent phosphorylation of MDM2 precedes p53 accumulation in response to DNA damage.
- BiologyProceedings of the National Academy of Sciences of the United States of America
- 1999
It is shown that after treatment of cells with ionizing radiation or a radiomimetic chemical, but not UV radiation, MDM2 is phosphorylated rapidly in an ATM-dependent manner, independent of p53 and the DNA-dependent protein kinase.
The negative role of cyclin G in ATM-dependent p53 activation
- BiologyOncogene
- 2004
Evidence is presented that cyclin G-mediated p53 regulation is dependent upon the status of ataxia-telangiectasia mutated (ATM) protein, which activates p53 in response to DNA damage, and that translocation ofcyclin G to the nucleus requires functional ATM.
A plausible model for the digital response of p53 to DNA damage.
- BiologyProceedings of the National Academy of Sciences of the United States of America
- 2005
In this model, double-strand break sites induced by IR interact with a limiting pool of DNA repair proteins, forming DSB-protein complexes at DNA damage foci, which exhibit a coordinated oscillatory dynamics upon IR stimulation in single cells with a stochastic number of oscillations whose mean increases with IR dose.



