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Rho-Associated Protein Kinase (ROCK) Inhibitors Inhibit Survivin Expression and Sensitize Pancreatic Cancer Stem Cells to Gemcitabine.

BACKGROUND: Targeting pathways regulating survivin expression, which has been implicated in multidrug resistance of cancer cells, is a promising strategy to overcome cancer chemoresistance. To date, the role of rho-associated protein kinases (ROCKs) in survivin expression remains largely unknown.

MATERIALS AND METHODS: The effects of ROCK inhibitors Y-27632 and fasudil on survivin expression and cell viability were determined by immunoblot analysis and dye exclusion, respectively, in PANC-1 CSLC, a cancer stem cell line derived from a serum-cultured, gemcitabine-sensitive pancreatic cancer cell line, PANC-1.

RESULTS: siRNA-mediated knockdown of survivin revealed that the gemcitabine resistance of PANC-1 CSLC was dependent on survivin expression. Both Y-27632 and fasudil, reduced survivin expression in PANC-1 CSLC cells and sensitized them to gemcitabine. ROCK inhibition also reduced survivin expression in various other human cancer cell lines.

CONCLUSION: Small molecule inhibitor-mediated targeting of ROCK may be a viable strategy to overcome cancer chemoresistance through down-regulation of survivin.

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