Abstract
Lymph node metastasis (N classification) is one of the most important prognostic factors of nasopharyngeal carcinoma (NPC), and nerve involvement is associated with the transition of the N category in NPC patients. Although the nervous system has been reported to participate in many types of cancer progression, its functions in NPC progression remains unknown. Through analysis of gene profiling data, we demonstrate an enrichment of genes associated with neuronal development and differentiation in NPC tissues and cell lines. Among these genes, Nogo receptor 3 (NgR3), which was originally identified in the nervous system and plays a role in nerve development and regeneration, was inappropriately overexpressed in NPC cells and tissues. Immunohistochemical analysis demonstrated that the overexpression of NgR3 was correlated with poor prognosis in NPC patients. Overexpression of NgR3 promoted, and knocking down NgR3 inhibited, NPC cell migration and invasion in vitro and metastasis in vivo. The ability of NgR3 to promote cell migration was triggered by the downregulation of E-cadherin and enhanced cytoskeletal rearrangement and cell polarity, which were correlated with the activation of focal adhesion kinase (FAK). Collectively, NgR3 is a novel indicator of poor outcomes in NPC patients and plays an important role in driving the progression of NPC. These results suggest a potential link between the nervous system and NPC progression.
Key messages
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Genes involved in the neuronal biological process are enriched in nasopharyngeal carcinoma.
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Overexpression of NgR3 correlates with poor prognosis of nasopharyngeal carcinoma.
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NgR3 promotes NPC cell migration by downregulating E-cadherin.
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NgR3 promotes NPC cell polarity and enhances the formation of NPC cell pseudopodia by activating FAK/Src pathway.
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This study was approved by the Institute Research Ethics Committee at the Sun Yat-Sen Memorial Hospital. Written informed consent was obtained from each patient.
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Supplementary Figure S1
RTN4RL1 expression in NPC cell lines. (a) RTN4RL1 mRNA expression level in nasopharyngeal epithelial cell lines, data set GSE15903. (GIF 48 kb)
Supplementary Figure S2
The role of NgR3 in proliferation and clonal formation of NPC cells. (a and b) MTT assay of NgR3 stably overexpressed CNE1 and S26 cell lines cultured in 5% FBS RPMI 1640. (c) MTT assay of NgR3 stably knockdown CNE2 cell line, cultured in 5% FBS 1640. (d and f) Clonal formation assay of CNE1 and S26 cell lines stably overexpression of NgR3. (e and g) Statistical results of D and F. All experiments were performed in biological triplicates with three technical replicates and values represented the mean ± S.E.M. *P < 0.05, **P < 0.01, ***P < 0.001, ns, no significant. (GIF 266 kb)
Supplementary Figure S3
Expression level of classical ligands and co-receptors of NgR3 are not changed in nasopharyngeal tissues and cell lines. (a) Expression of NogoA in nasopharyngeal epithelial cell lines. (b) Expression of MAG in nasopharyngeal epithelial cell lines. (c) Expression of OMgP in nasopharyngeal epithelial cell lines. (d) Expression of TROY in nasopharyngeal epithelial cell lines. (e) Hot-map of NgR3 ligands and co-receptors expression in data set GSE53819. (f) Fold change of NgR3’s ligands and co-receptors. (g-k) qPCR to detect expression of RTN4RL1’s ligands and co-receptors in non-cancerous nasopharyngeal tissues and NPC tissues. All experiments were performed in biological triplicates with three technical replicates and values represented the mean ± S.E.M. *P < 0.05, **P < 0.01, ***P < 0.001, ns, no significant. (GIF 262 kb)
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He, JY., Han, P., Zhang, Y. et al. Overexpression of Nogo receptor 3 (NgR3) correlates with poor prognosis and contributes to the migration of epithelial cells of nasopharyngeal carcinoma patients. J Mol Med 96, 265–279 (2018). https://doi.org/10.1007/s00109-017-1618-1
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DOI: https://doi.org/10.1007/s00109-017-1618-1