Stabilization of P/CAF, as a ubiquitin ligase toward MDM2, suppresses mitotic cell death through p53-p21 activation in HCT116 cells with SIRT2 suppression.

Abstract:

:We previously reported that the suppression of SIRT2, an NAD + -dependent protein deacetylases, induces p53 accumulation via degradation of p300 and the subsequent MDM2 degradation, eventually leading to apoptosis in HeLa cells. The present study identified a novel pathway of p53 accumulation by SIRT2 suppression in HCT116(p53+/+) cells in which SIRT2 suppression led to escape from mitotic cell death caused by spindle assembly checkpoint activation induced by microtubule inhibitors such as nocodazole but not apoptosis or G1 or G2 arrest. We found that SIRT2 interacts with P/CAF, a histone acetyltransferase, which also acts as a ubiquitin ligase against MDM2. SIRT2 suppression led to an increase of P/CAF acetylation and its stabilization followed by a decrease in MDM2 and activation of the p53-p21 pathway. Depression of mitotic cell death in HCT116(p53+/+) cells with SIRT2 suppression was released by suppression of P/CAF or p21. Thus, the P/CAF-MDM2-p53-p21 axis enables the escape from mitotic cell death and confers resistance to nocodazole in HCT116(p53+/+) cells with SIRT2 suppression. As SIRT2 has attracted attention as a potential target for cancer therapeutics for p53 regulation, the present study provides a molecular basis for the efficacy of SIRT2 for future cancer therapy based on p53 regulation. These findings also suggest an undesirable function of the SIRT2 suppression associated with activation of the p53-p21 pathway in the suppression of mitotic cell death caused by spindle assembly checkpoint activation.

authors

Li Y,Kokura K,Inoue T

doi

10.1016/j.bbrc.2018.11.136

subject

Has Abstract

pub_date

2019-01-01 00:00:00

pages

230-236

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(18)32568-3

journal_volume

508

pub_type

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