Epstein-Barr virus encoded latent membrane protein 1 induces TRAF1 expression to promote anti-apoptosis activity via NF-kappaB signaling pathway in nasopharyngeal carcinoma / 中华医学杂志(英文版)
Chinese Medical Journal
; (24): 1022-1028, 2003.
Article
in En
| WPRIM
| ID: wpr-294178
Responsible library:
WPRO
ABSTRACT
<p><b>OBJECTIVES</b>To identify whether Epstein-Barr virus (EBV) encoded latent membrane protein 1 (LMP1) can induce tumor necrosis factor receptor-associated factor 1 (TRAF1) expression and promote its anti-apoptosis activity via the NF-kappaB signaling pathway, and assess that LMP1 suppresses apoptosis in nasopharyngeal carcinoma (NPC).</p><p><b>METHODS</b>A stable transfected cell line HNE2-LMP1 was established by introducing LMP1 cDNA into HNE2 cells. Transactivation of TRAF1 was determined by luciferase reporter assay, while expression of TRAF1 mRNA was detected by RT-PCR and expression of TRAF1 protein and caspase 3 by Western blot analysis. Apoptosis activity was observed through fluorescence staining.</p><p><b>RESULTS</b>LMP1 induced TRAF1 expression in NPC cells and caused a decrease in apoptosis. This induction could be blocked by antisense LMP1. Moreover, LMP1-mediated induction of a TRAF1 promoter-driven reporter gene was significantly impaired when the kappaB site kappaB1 or kappaB5 was disrupted, whereas mutation of kappaB3 had only a minor effect on LMP1 dependent up-regulation of the reporter gene.</p><p><b>CONCLUSION</b>LMP1 induces TRAF1 expression and promotes its anti-apoptosis activity via the NF-kappaB signaling pathway, which may be one of the mechanisms that LMP1 uses to suppress apoptosis in NPC cells.</p>
Full text:
1
Index:
WPRIM
Main subject:
Physiology
/
Protein Biosynthesis
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Tumor Cells, Cultured
/
Signal Transduction
/
Viral Matrix Proteins
/
Nasopharyngeal Neoplasms
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NF-kappa B
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Apoptosis
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TNF Receptor-Associated Factor 1
Type of study:
Prognostic_studies
Limits:
Humans
Language:
En
Journal:
Chinese Medical Journal
Year:
2003
Type:
Article