Fbxo6 confers drug-sensitization to cisplatin via inhibiting the activation of Chk1 in non-small cell lung cancer.

Fbxo6 (also called FBG2) is a critical component of the evolutionarily conserved ubiquitin-protein ligase complex SCF (Skp1/Cdc53-Cullin1/F-box). Previous studies have demonstrated that Fbxo6 facilitates the growth and proliferation but inhibits the apoptosis and invasion of gastric cancer cells. However, the role of Fbxo6 in non-small cell lung cancer (NSCLC) is still not clear. Our results revealed that Fbxo6 expression is correlated with early TNM stage and favorable overall survival of NSCLC patients. Further in vitro experiments showed that Fbxo6 inhibits proliferation, facilitates apoptosis and promotes the sensitivity of cisplatin via decreased expression and phosphorylation of Chk1. Thus, Fbxo6 may be a useful prognosis marker and therapeutic target to overcome the chemoresistance of cisplatin-based chemotherapy agents in NSCLC patients.