Abstract
EBV-associated gastric carcinoma (EBVaGC) is a specific subgroup of gastric carcinoma, and the multifunctional transcriptional factor NF-κB may contribute to its tumorigenesis. In this study, we comprehensively characterized NF-κB signaling in EBVaGC using qRT-PCR, western blot, immunofluorescence assays, ELISA, and immunohistochemistry staining. NF-κB-signaling inhibitors may inhibit the growth of EBVaGC cells and induce significant apoptosis. IκBα is a key regulatory molecule, and repression of IκBα can contribute to aberrant NF-κB activation. Overexpression of LMP1 and LMP2A in the EBV-negative GC cell line SGC7901 could inhibit the expression of IκBα and induce NF-κB activation. These findings indicate that the canonical NF-κB signal is constitutively activated and plays an important role in EBVaGC tumorigenesis.
Keywords:
Epstein-Barr virus; Gastric carcinoma; IκBα; LMP1; LMP2A; NF-κB; TRAF1.
Copyright © 2019 Elsevier Inc. All rights reserved.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Carcinogenesis / genetics*
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Carcinogenesis / metabolism
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Carcinogenesis / pathology
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Carcinoma / genetics*
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Carcinoma / metabolism
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Carcinoma / pathology
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Cell Line, Tumor
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Cell Proliferation / drug effects
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Epstein-Barr Virus Infections / genetics*
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Epstein-Barr Virus Infections / metabolism
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Epstein-Barr Virus Infections / pathology
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Epstein-Barr Virus Nuclear Antigens / genetics
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Epstein-Barr Virus Nuclear Antigens / metabolism
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Gene Expression Regulation, Neoplastic*
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Herpesvirus 4, Human / genetics*
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Herpesvirus 4, Human / growth & development
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Herpesvirus 4, Human / pathogenicity
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Humans
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Leupeptins / pharmacology
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NF-KappaB Inhibitor alpha / genetics
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NF-KappaB Inhibitor alpha / metabolism
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NF-kappa B / antagonists & inhibitors
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NF-kappa B / genetics*
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NF-kappa B / metabolism
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Nitriles / pharmacology
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RNA, Small Interfering / genetics
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RNA, Small Interfering / metabolism
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Signal Transduction
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Stomach Neoplasms / genetics*
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Stomach Neoplasms / metabolism
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Stomach Neoplasms / pathology
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Sulfones / pharmacology
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TNF Receptor-Associated Factor 1 / antagonists & inhibitors
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TNF Receptor-Associated Factor 1 / genetics*
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TNF Receptor-Associated Factor 1 / metabolism
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Viral Matrix Proteins / genetics
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Viral Matrix Proteins / metabolism
Substances
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3-(4-methylphenylsulfonyl)-2-propenenitrile
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EBV-associated membrane antigen, Epstein-Barr virus
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Epstein-Barr Virus Nuclear Antigens
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Leupeptins
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NF-kappa B
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Nitriles
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RNA, Small Interfering
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Sulfones
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TNF Receptor-Associated Factor 1
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Viral Matrix Proteins
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NF-KappaB Inhibitor alpha
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EBV-encoded nuclear antigen 1
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benzyloxycarbonylleucyl-leucyl-leucine aldehyde