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CDK9 is dispensable for YAP-driven hepatoblastoma development
Xinyan Chen1,2, Andras Kiss3, Zsuzsa Schaff3
1Department of Pharmacy, Hubei University of Chinese Medicine, Wuhan, China.
Pediatric Blood & Cancer
|March 4, 2020
Summary
Cyclin-dependent kinases 9 (CDK9) is not a key driver in pediatric hepatoblastoma (HB) development. Studies show CDK9 silencing accelerated liver tumorigenesis in mice, suggesting it does not mediate YAP oncogenic functions in HB.
Area of Science:
- Oncology
- Molecular Biology
- Pediatric Medicine
Background:
- Hepatoblastoma (HB) is the most common pediatric liver cancer.
- Coordinated activation of Wnt/β-catenin and YAP/Hippo pathways is frequent in HB.
- Cyclin-dependent kinases 9 (CDK9) is implicated in YAP-driven tumorigenesis.
Purpose of the Study:
- To investigate the role of CDK9 in the molecular pathogenesis of hepatoblastoma.
- To determine if CDK9 mediates YAP oncogenic functions in HB development.
Main Methods:
- CDK9 expression analysis in human HB samples, cell lines, and mouse models.
- CDK9 silencing in HB cell lines to assess effects on growth and YAP targets.
- In vivo studies using hydrodynamic transfection in YAP/β-catenin mice with Cdk9 knockdown.
Main Results:
- CDK9 protein expression was elevated in human and mouse HB tissues and cell lines.
- CDK9 silencing did not consistently affect HB cell growth or YAP target gene expression.
- Surprisingly, CDK9 silencing accelerated liver tumorigenesis in YAP/β-catenin mice.
Conclusions:
- CDK9 is not a major downstream mediator of YAP oncogenic function in hepatoblastoma development.
- The role of CDK9 in HB pathogenesis requires further investigation, as its inhibition accelerated tumor formation in a mouse model.
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