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Effects of HBV X gene and arsenic trioxide on the expression of p53 in cultured HepG2 cells

Background Hepatitis B virus (HBV) X protein (HBx) and p53 could mutually down-regulate at transcriptional level and HBx could bind with p53 protein within its transactivation domain and inhibit the function of p53 protein. In recent years, effects of arsenic trioxide (As2O3) on the expression of p5... Full description

Journal Title: Chinese medical journal 2007, Vol.120 (24), p.2181-2184
Main Author: Lei, Jian-hua
Other Authors: He, Xing-e , Yang, Xu , Zhang, Min , Lian, Jun , Luo, Hong-Yu , Wang, Wen-long
Format: Electronic Article Electronic Article
Language: English
Subjects:
Publisher: China: Liver Disease Research Center,Second Xiangya Hospital,Central South University,Changsha 410011,China
ID: ISSN: 0366-6999
Link: https://www.ncbi.nlm.nih.gov/pubmed/18167198
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recordid: cdi_wanfang_journals_zhcmj200724004
title: Effects of HBV X gene and arsenic trioxide on the expression of p53 in cultured HepG2 cells
format: Article
creator:
  • Lei, Jian-hua
  • He, Xing-e
  • Yang, Xu
  • Zhang, Min
  • Lian, Jun
  • Luo, Hong-Yu
  • Wang, Wen-long
subjects:
  • Arsenicals - pharmacology
  • Cell Line, Tumor
  • Enzyme-Linked Immunosorbent Assay
  • Humans
  • Oxides - pharmacology
  • RNA Interference
  • Trans-Activators - genetics
  • Tumor Suppressor Protein p53 - analysis
  • X基因
  • 三氧化砷
  • 乙肝病毒
  • 基因表达
  • 肿瘤抑制蛋白
ispartof: Chinese medical journal, 2007, Vol.120 (24), p.2181-2184
description: Background Hepatitis B virus (HBV) X protein (HBx) and p53 could mutually down-regulate at transcriptional level and HBx could bind with p53 protein within its transactivation domain and inhibit the function of p53 protein. In recent years, effects of arsenic trioxide (As2O3) on the expression of p53 protein have been widely studied, while little is known about the activity of p53 protein. This study was undertaken to delineate the effect of HBV X gene and AS203 on p53 protein expression (level and activity) in HepG2 cells by small hairpin RNA (shRNA)-mediated RNA interference (RNAi) technique. Methods Cell line HepG2 and cells with stable expression of HBV X gene (HepG2-X) were treated with 2 pmol/L AS203, with corresponding untreated cells serving as controls. Cell lysates and nuclear extracts were extracted. Total level and the relative activity of p53 protein were detected by modified enzyme-linked immunosorbent assay (ELISA). HBV X gene sequence-specific shRNA expression vector (pXi-1 and pXi-2) and sequence-unrelated control (pXi-3) were transfected into HepG2-X. Single cell clone with stable expression of shRNA was selected and exposed to propagating culture. The effect of As2O3 on p53 protein expression and activity was re-observed. Results Total p53 protein level was up-regulated and its relative activity ratio was enhanced by As2O3 in HepG2 and HepG2-X cells. The total p53 protein level induced by As2O3 was up-regulated by HBV X gene expression, while its relative activity was significantly suppressed. The suppression was removed after HBV X gene expression was repressed by shRNA. Conclusions As2O3 up-regulates p53 protein expression and enhance its activity. HBV X up-regulates As2O3 induced-p53 protein expression while suppresses its activity.
language: eng
source:
identifier: ISSN: 0366-6999
fulltext: no_fulltext
issn:
  • 0366-6999
  • 2542-5641
url: Link


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titleEffects of HBV X gene and arsenic trioxide on the expression of p53 in cultured HepG2 cells
creatorLei, Jian-hua ; He, Xing-e ; Yang, Xu ; Zhang, Min ; Lian, Jun ; Luo, Hong-Yu ; Wang, Wen-long
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descriptionBackground Hepatitis B virus (HBV) X protein (HBx) and p53 could mutually down-regulate at transcriptional level and HBx could bind with p53 protein within its transactivation domain and inhibit the function of p53 protein. In recent years, effects of arsenic trioxide (As2O3) on the expression of p53 protein have been widely studied, while little is known about the activity of p53 protein. This study was undertaken to delineate the effect of HBV X gene and AS203 on p53 protein expression (level and activity) in HepG2 cells by small hairpin RNA (shRNA)-mediated RNA interference (RNAi) technique. Methods Cell line HepG2 and cells with stable expression of HBV X gene (HepG2-X) were treated with 2 pmol/L AS203, with corresponding untreated cells serving as controls. Cell lysates and nuclear extracts were extracted. Total level and the relative activity of p53 protein were detected by modified enzyme-linked immunosorbent assay (ELISA). HBV X gene sequence-specific shRNA expression vector (pXi-1 and pXi-2) and sequence-unrelated control (pXi-3) were transfected into HepG2-X. Single cell clone with stable expression of shRNA was selected and exposed to propagating culture. The effect of As2O3 on p53 protein expression and activity was re-observed. Results Total p53 protein level was up-regulated and its relative activity ratio was enhanced by As2O3 in HepG2 and HepG2-X cells. The total p53 protein level induced by As2O3 was up-regulated by HBV X gene expression, while its relative activity was significantly suppressed. The suppression was removed after HBV X gene expression was repressed by shRNA. Conclusions As2O3 up-regulates p53 protein expression and enhance its activity. HBV X up-regulates As2O3 induced-p53 protein expression while suppresses its activity.
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subjectArsenicals - pharmacology ; Cell Line, Tumor ; Enzyme-Linked Immunosorbent Assay ; Humans ; Oxides - pharmacology ; RNA Interference ; Trans-Activators - genetics ; Tumor Suppressor Protein p53 - analysis ; X基因 ; 三氧化砷 ; 乙肝病毒 ; 基因表达 ; 肿瘤抑制蛋白
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descriptionBackground Hepatitis B virus (HBV) X protein (HBx) and p53 could mutually down-regulate at transcriptional level and HBx could bind with p53 protein within its transactivation domain and inhibit the function of p53 protein. In recent years, effects of arsenic trioxide (As2O3) on the expression of p53 protein have been widely studied, while little is known about the activity of p53 protein. This study was undertaken to delineate the effect of HBV X gene and AS203 on p53 protein expression (level and activity) in HepG2 cells by small hairpin RNA (shRNA)-mediated RNA interference (RNAi) technique. Methods Cell line HepG2 and cells with stable expression of HBV X gene (HepG2-X) were treated with 2 pmol/L AS203, with corresponding untreated cells serving as controls. Cell lysates and nuclear extracts were extracted. Total level and the relative activity of p53 protein were detected by modified enzyme-linked immunosorbent assay (ELISA). HBV X gene sequence-specific shRNA expression vector (pXi-1 and pXi-2) and sequence-unrelated control (pXi-3) were transfected into HepG2-X. Single cell clone with stable expression of shRNA was selected and exposed to propagating culture. The effect of As2O3 on p53 protein expression and activity was re-observed. Results Total p53 protein level was up-regulated and its relative activity ratio was enhanced by As2O3 in HepG2 and HepG2-X cells. The total p53 protein level induced by As2O3 was up-regulated by HBV X gene expression, while its relative activity was significantly suppressed. The suppression was removed after HBV X gene expression was repressed by shRNA. Conclusions As2O3 up-regulates p53 protein expression and enhance its activity. HBV X up-regulates As2O3 induced-p53 protein expression while suppresses its activity.
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0hepatitis B virus; gene X; arsenic trioxide; RNA interference; tumor suppressor protein p53
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abstractBackground Hepatitis B virus (HBV) X protein (HBx) and p53 could mutually down-regulate at transcriptional level and HBx could bind with p53 protein within its transactivation domain and inhibit the function of p53 protein. In recent years, effects of arsenic trioxide (As2O3) on the expression of p53 protein have been widely studied, while little is known about the activity of p53 protein. This study was undertaken to delineate the effect of HBV X gene and AS203 on p53 protein expression (level and activity) in HepG2 cells by small hairpin RNA (shRNA)-mediated RNA interference (RNAi) technique. Methods Cell line HepG2 and cells with stable expression of HBV X gene (HepG2-X) were treated with 2 pmol/L AS203, with corresponding untreated cells serving as controls. Cell lysates and nuclear extracts were extracted. Total level and the relative activity of p53 protein were detected by modified enzyme-linked immunosorbent assay (ELISA). HBV X gene sequence-specific shRNA expression vector (pXi-1 and pXi-2) and sequence-unrelated control (pXi-3) were transfected into HepG2-X. Single cell clone with stable expression of shRNA was selected and exposed to propagating culture. The effect of As2O3 on p53 protein expression and activity was re-observed. Results Total p53 protein level was up-regulated and its relative activity ratio was enhanced by As2O3 in HepG2 and HepG2-X cells. The total p53 protein level induced by As2O3 was up-regulated by HBV X gene expression, while its relative activity was significantly suppressed. The suppression was removed after HBV X gene expression was repressed by shRNA. Conclusions As2O3 up-regulates p53 protein expression and enhance its activity. HBV X up-regulates As2O3 induced-p53 protein expression while suppresses its activity.
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pubLiver Disease Research Center,Second Xiangya Hospital,Central South University,Changsha 410011,China
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doi10.1097/00029330-200712020-00004
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