The p53 and EGFR pathways are frequently altered in bladder cancers, yet their contributions to its progression remain elusive. Here we report that DEAD box polypeptide 31 (DDX31) plays a critical role in the multistep progression of muscle invasive bladder cancer (MIBC) through its sequential interactions with mutant p53 (mutp53) and EGFR. In early MIBC cells, nuclear DDX31 bound mutp53/SP1 and enhanced mutp53 transcriptional activation, leading to migration and invasion of MIBC. Cytoplasmic DDX31 also bound EGFR and phospho-nucleolin (p-NCL) in advanced MIBC, leading to EGFR-Akt signaling activation. High expression of both cytoplasmic DDX31 and p53 proteins correlated with poor prognosis in patients with MIBC, and blocking the DDX31-NCL interaction resulted in downregulation of EGFR-Akt signaling, eliciting an in vivo anti-tumor effect against bladder cancer. These findings reveal that DDX31 cooperates with mutp53 and EGFR to promote progression of MIBC, and inhibition of DDX31-NCL formation may lead to potential treatment strategies for advanced MIBC.
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Τρίτη 13 Φεβρουαρίου 2018
A DDX31/mutant-p53/EGFR axis promotes multistep progression of muscle invasive bladder cancer
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