Abstract:
BACKGROUND:Hepatitis C virus (HCV) core protein is known to cause oxidative stress and alter apoptosis pathways. However, the apoptosis results are inconsistent, and the real significance of oxidative stress is not well known. The aim of this study was twofold. First, we wanted to confirm whether core-induced oxidative stress was really significant enough to cause DNA damage, and whether it induced cellular antioxidant responses. Second, we wanted to evaluate whether this core-induced oxidative stress and the antioxidant response to it was responsible for apoptosis changes. METHODS:HCV core protein was expressed under control of the Tet-Off promoter in Huh-7 cells and HeLa cells. We chose to use deoxycholic acid (DCA) as a model because it is known to produce both reactive oxygen species (ROS) and apoptosis. RESULTS:Core expression uniformly increased ROS and 8-hydroxy-2'-deoxyguanosine (8-OHdG) under basal and DCA-stimulated conditions. Core protein expression also increased manganese superoxide dismutase levels. Core protein inhibited DCA-mediated mitochondrial membrane depolarization and DCA-mediated activation of caspase-9 and caspase-3, despite the increase in ROS by DCA. Core protein inhibited DCA-mediated apoptosis by increasing Bcl-x(L) protein and decreasing Bax protein, without affecting the proportion of Bax between mitochondria and cytosol, resulting in suppression of cytochrome c release from mitochondria into cytoplasm. CONCLUSIONS:HCV core protein induces oxidative DNA damage, whereas it inhibits apoptosis that is accompanied by enhancement of ROS production. Thus, oxidative stress and apoptosis modulation by core protein are independent of each other.
journal_name
J Gastroenteroljournal_title
Journal of gastroenterologyauthors
Hara Y,Hino K,Okuda M,Furutani T,Hidaka I,Yamaguchi Y,Korenaga M,Li K,Weinman SA,Lemon SM,Okita Kdoi
10.1007/s00535-005-1738-1subject
Has Abstractpub_date
2006-03-01 00:00:00pages
257-68issue
3eissn
0944-1174issn
1435-5922journal_volume
41pub_type
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pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
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更新日期:1998-01-01 00:00:00
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pub_type: 杂志文章,评审
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