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Journal Article
Research Support, Non-U.S. Gov't
Chemo-sensitizing effects of EP4 receptor-induced inactivation of nuclear factor-κB.
European Journal of Pharmacology 2014 November 6
The EP4 receptor conveys growth-inhibitory effects in mature and immature B cells via NF-κB. Herein, the EP4 receptor was evaluated as a potential therapeutic target for leukemia and lymphoma, whose survival depends on the constitutive activity of NF-κB. Utilizing a pharmacological approach, we proved that the EP4 receptor induces caspase-mediated apoptosis in malignantly transformed B cells, with the most prominent effect being on Burkitt׳s lymphoma cells. Since the increased activation of NF-κB underlies multi-drug resistance phenomena, we modulated this signaling pathway via EP4 receptor triggering. Pge1-OH, a specific EP4 receptor agonist, led to decreased NF-κB activity and a consequent decrease in levels of the antiapoptotic gene Bcl-xL in Ramos cells, resulting in an elevated sensitivity of cells towards bortezomib- and doxorubicin-induced chemotherapeutic effects. Our study identifies the as yet unrecognized potential of EP4 receptor agonists as chemo-sensitizing agents in B-cell lymphoma. The specific downregulation of NF-κB-dependent pathways in B-cell malignancies opens new possibilities for treatment and current therapy optimization using specific EP4 receptor agonists.
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