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Small-molecule kinase inhibitors provide insight into Mps1 cell cycle function.
Nicholas Kwiatkowski1, Nannette Jelluma, Panagis Filippakopoulos
1Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, USA.
Nature Chemical Biology
|April 13, 2010
Summary
New small-molecule inhibitors targeting Mps1 kinase disrupt spindle assembly and cause aneuploidy, offering insights into cell cycle regulation and cancer cell viability.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Mps1 (Monaster of the Spindle 1) is a crucial dual-specificity kinase.
- It plays a vital role in spindle assembly checkpoint (SAC) function and chromosomal stability.
- Mps1's involvement across multiple cell cycle phases necessitates specific inhibitors for detailed study.
Purpose of the Study:
- To develop and characterize potent, selective small-molecule inhibitors of Mps1.
- To investigate the cellular consequences of Mps1 inhibition.
- To elucidate Mps1-related biological processes using these novel inhibitors.
Main Methods:
- Synthesis and cellular evaluation of novel Mps1 inhibitors.
- Cocrystallization of Mps1 with inhibitors to determine structural basis of inhibition.
- Analysis of cellular phenotypes including kinetochore protein localization, kinase activity, mitotic progression, and cell viability.
- Assessment of effects in cancer cell lines with supernumerary centrosomes.
Main Results:
- Chemical inhibition of Mps1 recapitulates RNAi findings, causing defects in Mad1/Mad2 kinetochore localization and reduced Aurora B activity.
- Mps1 inhibition leads to premature mitotic exit and widespread aneuploidy.
- In cells with extra centrosomes, Mps1 inhibition increases multipolar mitoses.
- Mps1 inhibitor treatment significantly reduces cancer cell viability.
Conclusions:
- Selective Mps1 inhibitors are effective tools for dissecting Mps1's role in cell cycle regulation.
- Mps1 inhibition disrupts SAC function, leading to aneuploidy and impacting cancer cell survival.
- These inhibitors hold potential for understanding and targeting Mps1 in cancer biology.
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