tailieunhanh - Báo cáo y học: "Intracytoplasmic stable expression of IgG1 antibody targeting NS3 helicase inhibits replication of highly efficient hepatitis C Virus 2a clone"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Intracytoplasmic stable expression of IgG1 antibody targeting NS3 helicase inhibits replication of highly efficient hepatitis C Virus 2a clone | Chandra et al. Virology Journal 2010 7 118 http content 7 1 118 VIROLOGY JOURNAL RESEARCH Open Access Intracytoplasmic stable expression of IgG1 antibody targeting NS3 helicase inhibits replication of highly efficient hepatitis C Virus 2a clone Partha KChandra 1 Sidhartha Hazari1 Bret Poat1 Feyza Gunduz2 Ramesh Prabhu1 Gerald Liu1 Roberto Burioni3 Massimo Clementi3 Robert F Garry4 and Srikanta Dash 1 2 Abstract Background Hepatitis C virus HCV infection is a major public health problem with more than 170 million cases of chronic infections worldwide. There is no protective vaccine currently available for HCV therefore the development of novel strategy to prevent chronic infection is important. We reported earlier that a recombinant human antibody clone blocks viral NS3 helicase activity and inhibits replication of HCV 1b virus. This study was performed further to explore the mechanism of action of this recombinant antibody and to determine whether or not this antibody inhibits replication and infectivity of a highly efficient JFH1 HCV 2a virus clone. Results The antiviral effect of intracellular expressed antibody against the HCV 2a virus strain was examined using a full-length green fluorescence protein GFP labeled infectious cell culture system. For this purpose a cell line stably expressing the NS3 helicase gene specific IgG1 antibody was prepared. Replication of full-length HCV-GFP chimera RNA and negative-strand RNA was strongly inhibited in cells stably expressing NS3 antibody but not in the cells expressing an unrelated control antibody. cells stably expressing NS3 helicase antibody effectively suppressed infectious virus production after natural infection and the level of HCV in the cell free supernatant remained undetectable after first passage. In contrast cells stably expressing an control antibody against influenza virus had no effect on virus production and high-levels of infectious HCV were detected in