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Cyclin-dependent kinases (CDKs) play important roles in the development of many types of cancers by binding with their paired cyclins. However, the function of CDK11 larger protein isomer, CDK11 p110 , in the tumorigenesis of human breast cancer remains unclear. In the present study, we explored the effects and molecular mechanisms of CDK11 p110  in the proliferation and growth of breast cancer cells by determining the expression of CDK11 p110  in breast tumor tissues and examining the phenotypic changes of breast cancer cells after CDK11 p110  knockdown. We found that CDK11 p110  was highly expressed in breast tumor tissues and cell lines. Tissue microarray analysis showed that elevated CDK11 p110  expression in breast cancer tissues significantly correlated with poor differentiation, and was also associated with advanced TNM stage and poor clinical prognosis for breast cancer patients.  In vitro  knockdown of CDK11 p110  by siRNA significantly inhibited cell growth and migration, and dramatically induced apoptosis in breast cancer cells. Flow cytometry demonstrated that cells were markedly arrested in G1 phase of the cell cycle after CDK11 p110  downregulation. These findings suggest that CDK11 p110  is critical for the proliferation and growth of breast cancer cells, which highlights CDK11 p110  may be a promising therapeutic target for the treatment of breast cancer.

Cyclin-dependent kinase 11p110 (CDK11p110) is crucial for human breast cancer cell proliferation and growth