RON Nuclear Translocation under Hypoxia Potentiates Chemoresistance to DNA Double-Strand Break-Inducing Anticancer Drugs

Molecular Cancer Therapeutics
Hong-Yi ChangNan-Haw Chow

Abstract

Tumor hypoxia is associated with radioresistance, chemoresistance, and metastasis, which eventually lead to cancer progression and a poor patient prognosis. RON [also known as macrophage-stimulating protein receptor (MST1R)] belongs to the c-MET [also known as hepatocyte growth factor receptor (HGFR)] receptor tyrosine kinase (RTK) superfamily. To identify the interaction partners of RON nuclear translocation in response to hypoxia, the nuclear extract of TSGH8301 bladder cancer cells was immunoprecipitated for tandem mass profiling analysis. Nuclear RON interacted with adenosine triphosphate (ATP)-dependent DNA helicase 2 (Ku70) and DNA-dependent protein kinase catalytic subunit (DNA-PKcs) to activate nonhomologous end joining (NHEJ) DNA repair. The interaction was time dependent, extending 3 to 24 hours posthypoxia or until the components had been exposed to the chemotherapeutic drugs doxorubicin and epirubicin. Stable knockdown experiments in vitro suggest the importance of RON for the chemoresistance of cancer cells under hypoxia. In addition, the tyrosine kinase domain of nuclear RON is crucial for interaction with Ku70 under hypoxia. J82 cells transfected with RON showed a survival advantage in the presence of epirubicin ...Continue Reading

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