PKCε Controls Mitotic Progression by Regulating Centrosome Migration and Mitotic Spindle Assembly
Silvia Martini1,2, Tanya Soliman2, Giuliana Gobbi1
1Department of Medicine and Surgery, University of Parma, Parma, Italy.
Molecular Cancer Research : MCR
|October 13, 2017
Summary
Protein kinase C epsilon (PKCε) coordinates centrosome migration and mitotic spindle assembly in cancer cells. This regulation is crucial for cell-cycle progression, highlighting PKCε as a potential cancer therapeutic target.
Area of Science:
- Cell Biology
- Cancer Research
- Molecular Oncology
Background:
- Proper mitotic spindle formation requires timely centrosome duplication and poleward movement.
- Errors in spindle assembly and centrosome separation can cause chromosome instability, a cancer hallmark.
- Protein kinase C epsilon (PKCε) regulates later cell-cycle events, but its role in early mitosis was unknown.
Purpose of the Study:
- To investigate the role of PKCε in earlier (pre)mitotic events.
- To determine if PKCε influences centrosome migration and spindle assembly.
- To explore the link between PKCε function and cancer cell-specific checkpoints.
Main Methods:
- Studied PKCε function in transformed cells.
- Investigated coordination of centrosome migration and mitotic spindle assembly.
- Assessed the role of cytoplasmic dynein.
- Examined the correlation with TOPO2A-dependent G2 checkpoint functionality.
Main Results:
- PKCε controls prophase-to-metaphase progression by coordinating centrosome migration and spindle assembly in transformed cells.
- This control is mediated through cytoplasmic dynein.
- PKCε dependency for spindle organization correlates with a nonfunctional TOPO2A-dependent G2 checkpoint, common in transformed cells.
Conclusions:
- PKCε is engaged in cell-cycle progression controls specifically in transformed cells.
- PKCε plays a critical role in organizing the mitotic spindle in cancer cells.
- PKCε represents a potential therapeutic target for cancer treatment.
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