Long-term nicotine exposure-induced chemoresistance is mediated by activation of Stat3 and downregulation of ERK1/2 via nAChR and beta-adrenoceptors in human bladder cancer cells

Toxicological Sciences : an Official Journal of the Society of Toxicology
Rong-Jane ChenYing-Jan Wang

Abstract

Previous reports suggested that bladder cancer patients who continue to smoke while receiving chemotherapy have poorer outcomes than their nonsmoking counterparts. Nicotine, the major addictive compound in cigarette smoke, is known to induce chemoresistance in some cancer cells. Chemoresistance has been linked to the activation of Stat3 (signal transducer and activator of transcription). The objective of this study was to identify the role of Stat3 in chemoresistance induced by nicotine in human bladder cancer cell line, T24 cells. Chemoresistant T24 cells were established by persistent nicotine treatment. Apoptosis and cell cycle parameters were analyzed by Annexin V staining, poly(ADP-ribose) polymerase degradation, caspase activity, and propidium iodide staining. Signal transduction mediating the chemoresistance was detected by Western blotting and small interfering RNA (siRNA) transfection. We provide evidence for the first time that nicotine strongly activated Stat3, leading to Cyclin D1 overexpression, cell cycle perturbations, and chemoresistance. Furthermore, nicotine mobilized Stat3 signaling, resulting in the loss of extracellular signal-regulated protein kinase 1/2 (ERK 1/2) activation and reduced chemosensitivity vi...Continue Reading

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