Silencing Mediator of Retinoic Acid and Thyroid Hormone Receptor Regulates Enhanced Activation of Signal Transducer and Activator of Transcription 3 by Epstein–Barr Virus-Derived Epstein–Barr Nuclear Antigen 2

The Epstein–Barr virus (EBV)-encoded latency protein Epstein–Barr nuclear antigen 2 (EBNA2) is a nuclear transcriptional activator that is essential for EBV-induced cellular transformation. In a previous study, we demonstrated that EBNA2 interacts with signal transducer and activator of transcriptio...

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Veröffentlicht in:Biological & Pharmaceutical Bulletin 2009/07/01, Vol.32(7), pp.1283-1285
Hauptverfasser: Ikeda, Osamu, Togi, Sumihito, Kamitani, Shinya, Muromoto, Ryuta, Sekine, Yuichi, Nanbo, Asuka, Fujimuro, Masahiro, Matsuda, Tadashi
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container_issue 7
container_start_page 1283
container_title Biological & Pharmaceutical Bulletin
container_volume 32
creator Ikeda, Osamu
Togi, Sumihito
Kamitani, Shinya
Muromoto, Ryuta
Sekine, Yuichi
Nanbo, Asuka
Fujimuro, Masahiro
Matsuda, Tadashi
description The Epstein–Barr virus (EBV)-encoded latency protein Epstein–Barr nuclear antigen 2 (EBNA2) is a nuclear transcriptional activator that is essential for EBV-induced cellular transformation. In a previous study, we demonstrated that EBNA2 interacts with signal transducer and activator of transcription 3 (STAT3), a signal transducer for an interleukin (IL)-6 family cytokine, and enhances its transcriptional activity. Here, we show that overexpression of a corepressor, silencing mediator of retinoic acid and thyroid hormone receptor (SMRT), decreases the EBNA2-mediated enhanced STAT3 activation. Furthermore, small-interfering RNA-mediated reduction of endogenous SMRT expression augments the EBNA2-mediated enhanced STAT3 activation. Importantly, EBNA2 reduces interactions between STAT3 and SMRT. These data demonstrate that EBNA2 acts as a transcriptional coactivator of STAT3 by influencing the SMRT corepressor complex.
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subjects Antibodies, Monoclonal - pharmacology
DNA-Binding Proteins - biosynthesis
DNA-Binding Proteins - metabolism
Epstein-Barr virus
Epstein-Barr Virus Nuclear Antigens - metabolism
Epstein–Barr nuclear antigen 2
HeLa Cells
Humans
Immunoblotting
Immunoprecipitation
Interleukin-6 - biosynthesis
Luciferases - genetics
Nuclear Receptor Co-Repressor 2
Repressor Proteins - biosynthesis
Repressor Proteins - metabolism
Reverse Transcriptase Polymerase Chain Reaction
RNA, Small Interfering - genetics
SMRT
STAT3
STAT3 Transcription Factor - biosynthesis
STAT3 Transcription Factor - genetics
Transcriptional Activation
Transfection
Viral Proteins - metabolism
title Silencing Mediator of Retinoic Acid and Thyroid Hormone Receptor Regulates Enhanced Activation of Signal Transducer and Activator of Transcription 3 by Epstein–Barr Virus-Derived Epstein–Barr Nuclear Antigen 2
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