AIM: To investigate a specific association between hepatic steatosis and hepatitis C virus (HCV) core. METHODS: HeLa cells and primary mouse hepatocytes were transfected with HCV core plasmid, and conditional transgen...AIM: To investigate a specific association between hepatic steatosis and hepatitis C virus (HCV) core. METHODS: HeLa cells and primary mouse hepatocytes were transfected with HCV core plasmid, and conditional transgenics in which hepatic over-expression of HCV core is regulated by the tetracycline-off system, were developed. The expression of the HCV core was assessed over one to six months after withdrawal of doxycycline (dox) by immunohistochemistry (IHC) and Western blotting and by sequential liver biopsy. Hepatic steatosis was evaluated using oil red stain. 8-hydroxydeoxyguanosine (8-OHdG) stains and caspase levels were conducted to clarify hepatic oxidative stress and apoptosis rate. Serum aminotransferase was checked. RESULTS: The transfected hepatocytes had globular cores under the lipid vesicles. In transgenic mice on control diet, core expression was robust, localized to the cytoplasmic vesicle membrane and strongly associatedwith microvesicular steatosis, which was gradually replaced by macrovesicular steatosis. However, both steatosis and core positive hepatocytes diminished with time. Increases in aminotransferase, caspase and 8-OHdG were associated with peak core expression. CONCLUSION: The core protein was readily detected and morphologically associated with steatosis in individual hepatocytes both in vitro and in vivo. In vivo, oxidative stress caused by the core potentially reduced the number of core positive hepatocytes and in parallel the level of steatosis. To our knowledge, this is the f irst animal model that directly shows topological relationship between HCV core and hepatic lipid vesicles.展开更多
Hepatitis C virus(HCV)is a major cause of chronic hepatitis,liver cirrhosis,and hepatocellular carcinoma(HCC)worldwide.Among the structural proteins of HCV,the HCV core protein has the ability to regulate gene transcr...Hepatitis C virus(HCV)is a major cause of chronic hepatitis,liver cirrhosis,and hepatocellular carcinoma(HCC)worldwide.Among the structural proteins of HCV,the HCV core protein has the ability to regulate gene transcription,lipid metabolism,cell proliferation,apoptosis,and autophagy,all of which are closely related to the development of HCC.Transgenic mice carrying the HCV core gene exhibited age-dependent insulin resistance,hepatic steatosis,and HCC that resembled the clinical characteristics of chronic hepatitis C patients.Several dietary modifications,including calorie restriction and diets rich in saturated fatty acids,trans fatty acids,or cholesterol,were found to influence hepatic steatogenesis and tumorigenesis in HCV core gene transgenic mice.These strategies modulated hepatocellular stress and proliferation,in addition to hepatic fibrotic processes and the microenvironment,thereby corroborating a close interconnection between dietary habits and steatosis-related hepatocarcinogenesis.In this review,we summarize the findings obtained from mouse models transgenic for the HCV genome,with a special focus on HCV core gene transgenic mice,and discuss the mechanisms of steatogenesis and hepatocarcinogenesis induced by the HCV core protein and the impact of dietary habits on steatosis-derived HCC development.展开更多
目的构建丙肝病毒核心基因克隆载体pGEM-HCV/core,为进一步研究外部引导序列(external guide sequence,EGS)引导核糖核酸酶P在RNA水平阻断丙肝病毒核心基因的表达做好前期基础。方法将含HCV全长基因的pBRTM/HCV1-301l质粒于大肠杆菌JMl0...目的构建丙肝病毒核心基因克隆载体pGEM-HCV/core,为进一步研究外部引导序列(external guide sequence,EGS)引导核糖核酸酶P在RNA水平阻断丙肝病毒核心基因的表达做好前期基础。方法将含HCV全长基因的pBRTM/HCV1-301l质粒于大肠杆菌JMl09内扩增;提取pBRTM/HCV1-301l质粒;从pBRTM/HCV1-301l质粒中PCR扩增出HCV核心基因片段并将其插入pGEM-3Z克隆载体;以得到重组的pGEM-HCV/core克隆载体;最后EcoR I and Hind III双酶切鉴定HCV核心基因克隆载体。结果pGEM-HCV/core克隆载体经双酶切、凝胶电泳证明插入片段与HCV核心基因片段大小相符;经测序证明其插入序列与HCV core基因序列一致。结论成功构建了HCV核心基因的克隆载体pGEM-HCV/core。展开更多
基金grants from National Science Council, Taiwan, China. No. NSC 93-2314-B-182A-148, 94-2314-B-182A-185 and 95-3112-B-182A-002 Chang Gung Memorial Hospital, Taoyuan, Taiwan, China. No. CMRPG 33014, CMRPG 340341 and SMRPG350081
文摘AIM: To investigate a specific association between hepatic steatosis and hepatitis C virus (HCV) core. METHODS: HeLa cells and primary mouse hepatocytes were transfected with HCV core plasmid, and conditional transgenics in which hepatic over-expression of HCV core is regulated by the tetracycline-off system, were developed. The expression of the HCV core was assessed over one to six months after withdrawal of doxycycline (dox) by immunohistochemistry (IHC) and Western blotting and by sequential liver biopsy. Hepatic steatosis was evaluated using oil red stain. 8-hydroxydeoxyguanosine (8-OHdG) stains and caspase levels were conducted to clarify hepatic oxidative stress and apoptosis rate. Serum aminotransferase was checked. RESULTS: The transfected hepatocytes had globular cores under the lipid vesicles. In transgenic mice on control diet, core expression was robust, localized to the cytoplasmic vesicle membrane and strongly associatedwith microvesicular steatosis, which was gradually replaced by macrovesicular steatosis. However, both steatosis and core positive hepatocytes diminished with time. Increases in aminotransferase, caspase and 8-OHdG were associated with peak core expression. CONCLUSION: The core protein was readily detected and morphologically associated with steatosis in individual hepatocytes both in vitro and in vivo. In vivo, oxidative stress caused by the core potentially reduced the number of core positive hepatocytes and in parallel the level of steatosis. To our knowledge, this is the f irst animal model that directly shows topological relationship between HCV core and hepatic lipid vesicles.
基金This review has partially supported by JSPS Grants-in-Aid for Scientific Research(C)(KAKENHI,16K08616,16K08734,and 19K07383).
文摘Hepatitis C virus(HCV)is a major cause of chronic hepatitis,liver cirrhosis,and hepatocellular carcinoma(HCC)worldwide.Among the structural proteins of HCV,the HCV core protein has the ability to regulate gene transcription,lipid metabolism,cell proliferation,apoptosis,and autophagy,all of which are closely related to the development of HCC.Transgenic mice carrying the HCV core gene exhibited age-dependent insulin resistance,hepatic steatosis,and HCC that resembled the clinical characteristics of chronic hepatitis C patients.Several dietary modifications,including calorie restriction and diets rich in saturated fatty acids,trans fatty acids,or cholesterol,were found to influence hepatic steatogenesis and tumorigenesis in HCV core gene transgenic mice.These strategies modulated hepatocellular stress and proliferation,in addition to hepatic fibrotic processes and the microenvironment,thereby corroborating a close interconnection between dietary habits and steatosis-related hepatocarcinogenesis.In this review,we summarize the findings obtained from mouse models transgenic for the HCV genome,with a special focus on HCV core gene transgenic mice,and discuss the mechanisms of steatogenesis and hepatocarcinogenesis induced by the HCV core protein and the impact of dietary habits on steatosis-derived HCC development.
文摘目的构建丙肝病毒核心基因克隆载体pGEM-HCV/core,为进一步研究外部引导序列(external guide sequence,EGS)引导核糖核酸酶P在RNA水平阻断丙肝病毒核心基因的表达做好前期基础。方法将含HCV全长基因的pBRTM/HCV1-301l质粒于大肠杆菌JMl09内扩增;提取pBRTM/HCV1-301l质粒;从pBRTM/HCV1-301l质粒中PCR扩增出HCV核心基因片段并将其插入pGEM-3Z克隆载体;以得到重组的pGEM-HCV/core克隆载体;最后EcoR I and Hind III双酶切鉴定HCV核心基因克隆载体。结果pGEM-HCV/core克隆载体经双酶切、凝胶电泳证明插入片段与HCV核心基因片段大小相符;经测序证明其插入序列与HCV core基因序列一致。结论成功构建了HCV核心基因的克隆载体pGEM-HCV/core。
