Latent Membrane Protein 1 Antibody Inhibits Cell Migration, Invasion and Epithelial-Mesenchymal Transition of Nasopharyngeal Carcinoma Stem Cell via Regulating Wnt/β-Catenin Signaling Pathway

Objective: In order to investigate the effects of LMP1-Fab antibody on Nasopharyngeal carcinoma (NPC) cancer stem cells (CSCs). Methods/Results: Methods were performed to study the effects of LMP1-Fab antibody on NPC CSCs in vivo and in vitro, for example, transwell chamber assay, wound healing assay, western blot assay, quantitative real-time PCR assay animal experiments, animal fluorescence imaging, H&E staining, immunohistochemistry. We identified that LMP1 activated the migration and invasion of NPC. Whereas the LMP1-Fab antibody inhibited cell invasion, epithelial-mesenchymal transition (EMT) and migration of NPC CSCs in LMP1+ HNE2 cells. Furthermore, LMP1-Fab antibody significantly increased the expression of E-cadherin, and reduced the expressions of vimentin, N-cadherin and Slug in LMP1+ HNE2 CSCs cells. Mechanistically, LMP1-Fab antibody inhibited lung and liver metastasis by regulating the wnt/beta-catenin pathway in the nude mice. Conclusion: These results suggested that the novel antibody-targeting LMP1 is likely to be a potential strategy for the treatment of NPC.