circ_100984-miR-432-3p axis regulated c-Jun/YBX-1/β-catenin feedback loop promotes bladder cancer progression.

Bladder cancer (BC) is one of the most commonly diagnosed cancers globally. Recently, circular RNAs (circRNAs) have been revealed to participate in BC progression with diverse mechanisms. However, mechanisms of circ_100984 in BC have not been determined. Here, we found that circ_100984 and YBX-1 were high presented, while miR-432-3p was low presented in BC. Silencing of circ_100984 and YBX-1 repressed BC tumor growth, migration, and invasion in vitro and in vivo. Mechanistically, we revealed that circ_100984 served as a competing endogenous RNA that sponged miR-432-3p to indirectly regulate YBX-1 and epithelial-mesenchymal transition (EMT)-related molecules. Moreover, we confirmed that YBX-1 or c-Jun acted as a transcription regulatory factor for β-catenin or YBX-1, respectively, in BC cells. Knockdown of YBX-1 inhibited the expression of β-catenin and c-Jun, whereas downregulated c-Jun inversely repressed the expression of YBX-1 and β-catenin. Our results suggested that circ_100984-miR-432-3p axis regulated c-Jun/YBX-1/β-catenin feedback loop promotes BC progression, providing a potential therapeutic axis for BC progression.

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