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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
Published on: May 3, 2018
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PLK1 stabilizes a MYC-dependent kinase network in aggressive B cell lymphomas
Yuan Ren1, Chengfeng Bi2, Xiaohong Zhao1
1Department of Laboratory Medicine and Hematopathology, Moffitt Cancer Center & Research Institute, Tampa, Florida, USA.
The Journal of Clinical Investigation
|September 28, 2018
Summary
Polo-like kinase-1 (PLK1) drives aggressive double-hit lymphoma (DHL) by stabilizing MYC. Targeting PLK1 degrades MYC and MCL-1, offering a new therapeutic strategy for DHL.
Area of Science:
- Oncology
- Molecular Biology
- Proteomics
Background:
- Double-hit lymphoma (DHL) is characterized by aggressive disease due to concordant MYC and BCL-2 oncoprotein activation.
- Current treatments for DHL are often ineffective, highlighting the need for novel therapeutic targets.
Purpose of the Study:
- To identify essential regulators of the MYC-dependent kinome in DHL.
- To investigate the role of polo-like kinase-1 (PLK1) in DHL pathogenesis and its potential as a therapeutic target.
Main Methods:
- Activity-based proteomic profiling and drug screens were employed to identify key regulators in DHL.
- Expression levels of PLK1 and MYC were analyzed in DHL patient samples.
- The regulatory relationship between MYC and PLK1 was investigated.
- The effects of PLK1 inhibition on MYC and MCL-1 stability were assessed.
- Synergy between PLK1 inhibitors and BCL-2 antagonists was evaluated in vitro.
Main Results:
- PLK1 was identified as an essential regulator of the MYC-dependent kinome in DHL.
- High PLK1 expression in DHL correlated with MYC expression and predicted poor patient outcomes.
- A feed-forward circuit was established where PLK1 enhances MYC stability, and MYC induces PLK1 transcription.
- PLK1 inhibition led to the degradation of MYC and MCL-1.
- PLK1 inhibitors demonstrated synergistic effects with BCL-2 antagonists in inhibiting DHL cell growth and survival.
Conclusions:
- PLK1 plays a critical role in the aggressive behavior of DHL by regulating MYC stability and promoting cell survival.
- The identified MYC-PLK1 feed-forward circuit represents a key vulnerability in DHL.
- Targeting PLK1, particularly in combination with BCL-2 antagonists, holds significant promise for the clinical treatment of DHL.
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