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- W2097699863 abstract "Abstract Pheochromocytomas (PHEOs) and paragangliomas (PGLs) are specific types of neuroendocrine tumors that originate in the adrenal medulla or sympathetic/parasympathetic paraganglia, respectively. Although these tumors are intensively studied, a very effective treatment for metastatic PHEO or PGL has not yet been established. Preclinical evaluations of novel therapies for these tumors are very much required. Therefore, in this study we tested the effect of triptolide (TTL), a potent nuclear factor‐kappaB (NF‐κB) inhibitor, on the cell membrane norepinephrine transporter (NET) system, considered to be the gatekeeper for the radiotherapeutic agent 131I‐metaiodobenzylguanidine (131I‐MIBG). We measured changes in the mRNA and protein levels of NET and correlated them with proapoptotic factors and metastasis inhibition. The study was performed on three different stable PHEO cell lines. We found that blocking NF‐κB with TTL or capsaicin increased both NET mRNA and protein levels. Involvement of NF‐κB in the upregulation of NET was verified by mRNA silencing of this site and also by using NF‐κB antipeptide. Moreover, in vivo treatment with TTL significantly reduced metastatic burden in an animal model of metastatic PHEO. The present study for the first time shows how NF‐κB inhibitors could be successfully used in the treatment of metastatic PHEO/PGL by a significant upregulation of NET to increase the efficacy of 131I‐MIBG and by the induction of apoptosis." @default.
- W2097699863 created "2016-06-24" @default.
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- W2097699863 date "2012-08-20" @default.
- W2097699863 modified "2023-10-18" @default.
- W2097699863 title "NF-κB inhibition significantly upregulates the norepinephrine transporter system, causes apoptosis in pheochromocytoma cell lines and prevents metastasis in an animal model" @default.
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- W2097699863 doi "https://doi.org/10.1002/ijc.27524" @default.
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