Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 114, Issue 12, Pages 3127-3132Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1700234114
Keywords
Mps1/TTK; inhibitor; CFI-402257; cancer
Categories
Funding
- Princess Margaret Cancer Foundation
- Canadian Institutes of Health Research
- Genome Canada
- California Institute for Regenerative Medicine
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Loss of cell-cycle control is a hallmark of human cancer. Cell-cycle checkpoints are essential for maintaining genome integrity and balanced growth and division. They are specifically deregulated in cancer cells and contain regulators that represent potential therapeutic targets. Monopolar spindle 1 (Mps1; also known as TTK protein kinase) is a core component of the spindle assembly checkpoint (SAC), a genome-surveillance mechanism that is important for cell survival, and has emerged as a candidate target for anticancer therapy. Here, we report the cellular and antitumor effects of CFI-402257, a potent (Mps1 K-i = 0.09 +/- 0.02 nM; cellular Mps1 EC50 = 6.5 +/- 0.5 nM), highly selective, and orally active small-molecule inhibitor of Mps1 that was identified through a drug-discovery program. Human cancer cells treated with CFI-402257 exhibit effects consistent withMps1 kinase inhibition, specifically SAC inactivation, leading to chromosome missegregation, aneuploidy, and ultimately cell death. Oral administration of CFI-402257 in monotherapy or in combination with an anti-programmed cell death 1 (PD-1) antibody in mouse models of human cancer results in inhibition of tumor growth at doses that are well-tolerated. Our findings provide a rationale for the clinical evaluation of CFI-402257 in patients with solid tumors.
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