BORA regulates cell proliferation and migration in bladder cancer.

BACKGROUND

Bladder cancer is having a gradually increasing incidence in China. Except for the traditional chemotherapy drugs, there are no emerging new drugs for almost 30 years in bladder cancer. New potential therapeutic targets and biomarkers are urgently needed.

METHODS

BORA is the activator of kinase Aurora A and plays an important role in cell cycle progression. To investigate the function of BORA in BCa, we established knockdown and overexpression cell models for in vitro studies, xenograft and pulmonary metastasis mouse models for in vivo studies.

RESULTS

Our results indicated that BORA was upregulated in human bladder cancer (BCa) compared to the normal bladder and paracancerous tissues at transcriptional and translational levels. We found that BORA was positively related to BCa cell proliferation. Furthermore, knockdown induced cell cycle arrest in G2/M phase while overexpression decreased the proportion of cells in G2/M, associated with PLK1-CDC25C-CDK1 alteration. Interestingly, we observed that knockdown of inhibited BCa cell migration and invasion, accompanied with alterations of epithelial-mesenchymal transition (EMT) pathway related proteins. In vivo studies confirmed the inhibition effect of knockdown on BCa cell growth and migration.

CONCLUSIONS

Our study indicates that BORA regulates BCa cell cycle and growth, meanwhile influences cell motility by EMT, and could be a novel biomarker and potential therapeutic target in BCa.