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2017 ; 9
(1
): 34-44
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Mouse modelling of the MDM2/MDMX-p53 signalling axis
#MMPMID28096294
Tackmann NR
; Zhang Y
J Mol Cell Biol
2017[Feb]; 9
(1
): 34-44
PMID28096294
show ga
It is evident that p53 activity is critical for tumour prevention and stress
response through its transcriptional activation of genes affecting cellular
senescence, apoptosis, cellular metabolism, and DNA repair. The regulation of p53
is highly complex, and MDM2 and MDMX are thought to be critical for deciding the
fate of p53, both through inhibitory binding and post-translational modification.
Many mouse models have been generated to study the regulation of p53 in vivo, and
they have altered our interpretations of how p53 is regulated by MDM2 and MDMX.
Although MDM2 is absolutely required for p53 regulation, certain functions are
dispensable under unstressed conditions, including the ability of MDM2 to degrade
p53. MDMX, on the other hand, may only be required in select situations, like
embryogenesis. These models have also clarified how cellular stress signals
modify the p53-inhibiting activities of MDM2 and MDMX in vivo. It is clear that
more work will need to be performed to further understand the contexts for each
of these signals and the requirements of various MDM2 and MDMX functions. Here,
we will discuss what we have learned from mouse modelling of MDM2 and MDMX and
underscore the ways in which these models could inform future therapies.