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Bladder cancer (BC) has a high incidence and mortality rate worldwide. Suppressor anaphase-promoting complex domain containing 2 (SAPCDC2) is over-expressed in a variety of tumors.Objectives    This study investigated the effects of SAPCD2 knockdown on BC cells.Methods    T24 and UMUC3 cell models and the xenografted BC tumor model with SAPCD2 knockdown were established to observe the malignant phenotype of BC cells by cell counting kit-8 assay, colony formation test, wound healing, and Transwell assay, mRNA and proteins expressions were measured with quantitative real-time polymerase chain reaction, western blotting, and tissue immunohistochemistry. Lithium chloride agonist on the Wnt/β-catenin pathway was used to clarify the molecular mechanism of SAPCD2 knockdown.Results    SAPCD2 expression was significantly higher in BC cell lines than in SV-HUC-1 cells. SAPCD2 knockdown inhibited viability and cloning, hindered the G0/G1 phase of the cell cycle in UMUC3 and T24 cells, and decreased the migration and invasiveness of BC cells. SAPCD2 knockdown inhibited expression levels of cyclin D1, cyclin B1, N-cadherin, vimentin, Snail, β-catenin, c-Myc, and cyclin-dependent kinase 4, while the P21 and E-cadherin were raised by SAPCD2 knockdown. Furthermore, lithium chloride reversed the effects of SAPCD2 knockdown on the expression levels of the above proteins in UMUC3 and T24 cells.  In vivo , SAPCD2 knockdown inhibited the volume, weight, and expression of Ki-67 and β-catenin in tumors and increased the E-cadherin expression.Conclusion    SAPCD2 knockdown inhibits the malignant phenotype of BC via a pathway involving β-catenin.

Inhibition of proliferation, migration, and invasiveness of bladder cancer cells through SAPCD2 knockdown