The pregenomic RNA(pgRNA)of hepatitis B virus(HBV)serves not only as a bicistronic message RNA to translate core protein(Cp)and DNA polymerase(Pol),but also as the template for reverse transcriptional replication of v...The pregenomic RNA(pgRNA)of hepatitis B virus(HBV)serves not only as a bicistronic message RNA to translate core protein(Cp)and DNA polymerase(Pol),but also as the template for reverse transcriptional replication of viral DNA upon packaging into nucleocapsid.Although it is well known that pgRNA translates much more Cp than Pol,the molecular mechanism underlying the regulation of Cp and Pol translation efficiency from pgRNA remains elusive.展开更多
Treatment of chronic hepatitis B virus(HBV)infection with the viral DNA polymerase inhibitors or pegylated alpha-interferon has led to a significant retardation in HBV-related disease progression and reduction in mort...Treatment of chronic hepatitis B virus(HBV)infection with the viral DNA polymerase inhibitors or pegylated alpha-interferon has led to a significant retardation in HBV-related disease progression and reduction in mortality related to chronic hepatitis B associated liver decompensation and hepatocellular carcinoma.However,chronic HBV infection remains not cured.The reasons for the failure to eradicate HBV infection by long-term antiviral therapy are not completely understood.However,clinical studies suggest that the intrinsic stability of the nuclear form of viral genome,the covalently closed circular(ccc)DNA,sustained low level viral replication under antiviral therapy and homeostatic proliferation of hepatocytes are the critical virological and pathophysiological factors that affect the persistence and therapeutic outcomes of HBV infection.More importantly,despite potent suppression of HBV replication in livers of the treated patients,the dysfunction of HBV-specific antiviral immunity persists.The inability of the immune system to recognize cells harboring HBV infection and to cure or eliminate cells actively producing virus is the biggest challenge to finding a cure.Unraveling the complex virus–host interactions that lead to persistent infection should facilitate the rational design of antivirals and immunotherapeutics to cure chronic HBV infection.展开更多
2',3'-dideoxyguanosine(DoG) has been demonstrated to inhibit duck hepatitis B virus(DHBV) replication in vivo in a duck model of HBV infection. In the current study, the in vitro antiviral effects of DoG on hu...2',3'-dideoxyguanosine(DoG) has been demonstrated to inhibit duck hepatitis B virus(DHBV) replication in vivo in a duck model of HBV infection. In the current study, the in vitro antiviral effects of DoG on human and animal hepadnaviruses were investigated. Our results showed that DoG effectively inhibited HBV, DHBV, and woodchuck hepatitis virus(WHV)replication in hepatocyte-derived cells in a dose-dependent manner, with 50% effective concentrations(EC50) of 0.3 ± 0.05, 6.82 ± 0.25, and 23.0 ± 1.5 lmol/L, respectively. Similar to other hepadnaviral DNA polymerase inhibitors,DoG did not alter the levels of intracellular viral RNA but induced the accumulation of a less-than-full-length viral RNA species, which was recently demonstrated to be generated by RNase H cleavage of pgRNA. Furthermore, using a transient transfection assay, DoG showed similar antiviral activity against HBV wild-type, 3TC-resistant rtA181 V, and adefovirresistant rtN236T mutants. Our results suggest that DoG has potential as a nucleoside analogue drug with anti-HBV activity.展开更多
基金This work is supported by grants from the National Natural Science Foundation of China(82272315)the Natural Science Foundation of Beijing Municipality(7222108)National Key R&D Program of China(2022YFA1303600).
文摘The pregenomic RNA(pgRNA)of hepatitis B virus(HBV)serves not only as a bicistronic message RNA to translate core protein(Cp)and DNA polymerase(Pol),but also as the template for reverse transcriptional replication of viral DNA upon packaging into nucleocapsid.Although it is well known that pgRNA translates much more Cp than Pol,the molecular mechanism underlying the regulation of Cp and Pol translation efficiency from pgRNA remains elusive.
文摘Treatment of chronic hepatitis B virus(HBV)infection with the viral DNA polymerase inhibitors or pegylated alpha-interferon has led to a significant retardation in HBV-related disease progression and reduction in mortality related to chronic hepatitis B associated liver decompensation and hepatocellular carcinoma.However,chronic HBV infection remains not cured.The reasons for the failure to eradicate HBV infection by long-term antiviral therapy are not completely understood.However,clinical studies suggest that the intrinsic stability of the nuclear form of viral genome,the covalently closed circular(ccc)DNA,sustained low level viral replication under antiviral therapy and homeostatic proliferation of hepatocytes are the critical virological and pathophysiological factors that affect the persistence and therapeutic outcomes of HBV infection.More importantly,despite potent suppression of HBV replication in livers of the treated patients,the dysfunction of HBV-specific antiviral immunity persists.The inability of the immune system to recognize cells harboring HBV infection and to cure or eliminate cells actively producing virus is the biggest challenge to finding a cure.Unraveling the complex virus–host interactions that lead to persistent infection should facilitate the rational design of antivirals and immunotherapeutics to cure chronic HBV infection.
基金supported in part by the Program for New Century Excellent Talents in University (Program No. NCET-12-0975)the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry+1 种基金Jiangsu Overseas research & training program for University Prominent Young and Middle-aged Teachers and Presidents (for Pinghu Zhang)Qinghai Province High-end Innovative Talent Thousand Talents Program (for Pinghu Zhang)
文摘2',3'-dideoxyguanosine(DoG) has been demonstrated to inhibit duck hepatitis B virus(DHBV) replication in vivo in a duck model of HBV infection. In the current study, the in vitro antiviral effects of DoG on human and animal hepadnaviruses were investigated. Our results showed that DoG effectively inhibited HBV, DHBV, and woodchuck hepatitis virus(WHV)replication in hepatocyte-derived cells in a dose-dependent manner, with 50% effective concentrations(EC50) of 0.3 ± 0.05, 6.82 ± 0.25, and 23.0 ± 1.5 lmol/L, respectively. Similar to other hepadnaviral DNA polymerase inhibitors,DoG did not alter the levels of intracellular viral RNA but induced the accumulation of a less-than-full-length viral RNA species, which was recently demonstrated to be generated by RNase H cleavage of pgRNA. Furthermore, using a transient transfection assay, DoG showed similar antiviral activity against HBV wild-type, 3TC-resistant rtA181 V, and adefovirresistant rtN236T mutants. Our results suggest that DoG has potential as a nucleoside analogue drug with anti-HBV activity.
