Abstract
Epstein–Barr virus (EBV) latent membrane protein 1 (LMP1) has been suggested to be involved in tumor metastasis. However, the molecular mechanism of LMP1-induced metastasis is largely unknown. In this study, we investigated the effect of LMP1 on the expression of RECK, a metastasis suppressor gene, in an EBV-negative nasopharyngeal carcinoma (NPC) cell line. Our data demonstrated that LMP1 induced downregulation of RECK via transcription repression in TW04 cells. In addition, we found that LMP1 acted via an Sp1 site to inhibit RECK promoter activity. We next studied the signaling pathway that mediated the effect of LMP1 on RECK expression. Our results showed that LMP1 potently stimulated the activity of extracellular signal-regulated kinases (ERKs) and inhibition of ERK activity by PD98059 antagonized LMP1-induced downregulation of RECK. Conversely, the c-Jun N-terminal kinase inhibitor SP600125 and p38HOG kinase inhibitor SB203580 had little effect. We also found that the expression of LMP1 increased the invasive ability of TW04 cells. The importance of RECK in LMP1-induced invasiveness was supported by three observations. First, restoration of RECK expression by PD98059 reduced LMP1-induced release of active MMP-9. Second, suppression of PD98059-induced RECK expression by small interference RNA abolished the inhibitory action of PD98059 on LMP1-induced invasiveness. Third, coexpression of RECK with LMP1 in TW04 cells effectively suppressed cell invasiveness induced by LMP1. Taken together, these results suggest that LMP1 inhibits RECK expression via the ERK/Sp1 signaling pathway and this inhibition is a critical step for LMP1-induced tumor metastasis.
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Acknowledgements
We deeply thank Dr CT Lin for providing TW04 EBV-negative NPC cell line, and Dr YS Chang and Dr M Noda for providing the plasmids. We also thank Ms CH Fu for technical assistance. This study was supported by Grant NSC92-2314-B037-117 of the National Science Council of Republic of China to Wen-Chun Hung.
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Liu, LT., Peng, JP., Chang, HC. et al. RECK is a target of Epstein–Barr virus latent membrane protein 1. Oncogene 22, 8263–8270 (2003). https://doi.org/10.1038/sj.onc.1207157
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DOI: https://doi.org/10.1038/sj.onc.1207157
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