Delaying mitotic exit downregulates FLIP expression and strongly sensitizes tumor cells to TRAIL.

Abstract:

:Many of the current antitumor therapeutic strategies are based on the perturbation of the cell cycle, especially during mitosis. Antimitotic drugs trigger mitotic checkpoint activation, mitotic arrest and eventually cell death. However, mitotic slippage represents a major mechanism of resistance to these treatments. In an attempt to circumvent the process of slippage, targeting mitotic exit has been proposed as a better strategy to kill tumor cells. In this study, we show that treatments that induce mitotic checkpoint activation and mitotic arrest downregulate FLICE-like inhibitory protein (FLIP) levels and sensitize several tumor cell lines to TRAIL (tumor necrosis factor-related apoptosis-inducing ligand)-induced apoptosis. Interestingly, we also demonstrate that in absence of mitotic checkpoint activation, mitotic arrest induced either by Cdc20 knockdown or overexpression of nondegradable cyclin B is sufficient to induce both FLIP downregulation and sensitivity to TRAIL. In summary, our data suggest that a combination of antimitotic drugs targeting cyclin B degradation and TRAIL might prevent mitotic slippage and allow tumor cells to reach the threshold for apoptosis induction, thereby facilitating tumor suppression.

journal_name

Oncogene

journal_title

Oncogene

authors

Sánchez-Pérez T,Medema RH,López-Rivas A

doi

10.1038/onc.2013.601

subject

Has Abstract

pub_date

2015-01-29 00:00:00

pages

661-9

issue

5

eissn

0950-9232

issn

1476-5594

pii

onc2013601

journal_volume

34

pub_type

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