Inhibition of NOTCH3 signalling significantly enhances sensitivity to cisplatin in EBV-associated nasopharyngeal carcinoma
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AbstractNasopharyngeal carcinoma (NPC) is an EBV-associated epithelial malignancy which is prevalent in south-east Asia and southern China. Despite the multiple genetic and epigenetic changes reported, the contribution of dysregulated signalling pathways to this distinct type of head and neck cancer is not well understood. Here we demonstrate the up-regulation of NOTCH ligands (JAG1 or DLL4) and effector (HEY1) in the majority of EBV-positive tumour lines and primary tumours. Among the NOTCH receptors, NOTCH3 was over-expressed in all EBV-positive tumour lines and 92.5% of primary tumours. Aberrant activation of NOTCH3 signalling was consistently detected in all these samples. These findings imply that NOTCH3 may play an crucial role in the development of NPC. By NOTCH3 specific siRNA, NOTCH3 signalling was suppressed and thereby significant growth inhibition and apoptosis induction occurred in NPC cells. Down-regulation of a number of targets involved in cell proliferation, eg CCND1, C-MYC,NFKB1, and survival, eg BCL2, BCL-XL, SURVIVIN, was confirmed in the NOTCH3 knockdown NPC cells. Importantly, NOTCH3 knockdown highly enhanced the sensitivity of NPC cells to cisplatin treatment. Furthermore, we revealed that the ability of NPC cells to form spheroids in vitro and tumours in nude mice was also significantly decreased after knockdown of NICD3 expression. These findings indicate that activation of NOTCH3 pathway is a critical oncogenic event in NPC tumourigenesis. Targeting NOTCH3 signalling may serve as a potential therapeutic approach for treating patients suffering from EBV-associated NPC. Copyright © 2011 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
All Author(s) ListMan C.-H., Wei-Man Lun S., Hui J.W.-Y., To K.-F., Choy K.-W., Wing-Hung Chan A., Chow C., Tin-Yun Chung G., Tsao S.-W., Tak-Chun Yip T., Busson P., Lo K.-W.
Journal nameJournal of Pathology
Year2012
Month2
Day1
Volume Number226
Issue Number3
PublisherJohn Wiley & Sons Inc.
Place of PublicationUnited States
Pages471 - 481
ISSN0022-3417
eISSN1096-9896
LanguagesEnglish-United Kingdom
Keywordscisplatin, Epstein-Barr virus, nasopharyngeal carcinoma, NOTCH3

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