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  • Forced mitotic entry of S-phase cells as a therapeutic strategy induced by inhibition of WEE1.

Forced mitotic entry of S-phase cells as a therapeutic strategy induced by inhibition of WEE1.

Cancer discovery (2012-05-26)
Marieke Aarts, Rachel Sharpe, Isaac Garcia-Murillas, Heidrun Gevensleben, Melissa S Hurd, Stuart D Shumway, Carlo Toniatti, Alan Ashworth, Nicholas C Turner
ABSTRACT

Inhibition of the protein kinase WEE1 synergizes with chemotherapy in preclinical models and WEE1 inhibitors are being explored as potential cancer therapies. Here, we investigate the mechanism that underlies this synergy. We show that WEE1 inhibition forces S-phase-arrested cells directly into mitosis without completing DNA synthesis, resulting in highly abnormal mitoses characterized by dispersed chromosomes and disorganized bipolar spindles, ultimately resulting in mitotic exit with gross micronuclei formation and apoptosis. This mechanism of cell death is shared by CHK1 inhibitors, and combined WEE1 and CHK1 inhibition forces mitotic entry from S-phase in the absence of chemotherapy. We show that p53/p21 inactivation combined with high expression of mitotic cyclins and EZH2 predispose to mitotic entry during S-phase with cells reliant on WEE1 to prevent premature cyclin-dependent kinase (CDK)1 activation. These features are characteristic of aggressive breast, and other, cancers for which WEE1 inhibitor combinations represent a promising targeted therapy.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Anti-phospho-Histone H2A.X (Ser139) Antibody, clone JBW301, clone JBW301, Upstate®, from mouse
Sigma-Aldrich
Monoclonal Anti-β-Tubulin antibody produced in mouse, clone TUB 2.1, ascites fluid
Sigma-Aldrich
Anti-EZH2 Antibody, clone BD43, clone BD43, from mouse
Sigma-Aldrich
Anti-phospho-Histone H3 (Ser10) Antibody, Mitosis Marker, Upstate®, from rabbit