Entecavir combined with furin inhibitor simultaneously reduces hepatitis B virus replication and e antigen secretion

被引：8
作者：
Yang, Hui Y. [1 ,2 ]
Zheng, Nai Q. [1 ,2 ]
Li, Dong M. [1 ,2 ]
Gu, Lin [3 ]
Peng, Xiao M. [1 ,3 ]
机构：
[1] Sun Yat Sen Univ, Hosp Liver Dis, Hepatol Lab, Guangzhou 510630, Guangdong, Peoples R China
[2] Sun Yat Sen Univ, Affiliated Hosp 3, Dept Infect Dis, Guangzhou 510630, Guangdong, Peoples R China
[3] Liver Dis Key Lab Guangdong Prov, Guangzhou, Guangdong, Peoples R China
来源：
VIROLOGY JOURNAL | 2014年 / 11卷
关键词：
Hepatitis B virus; Viral replication; Hepatitis B e antigen; Proprotein convertase; Furin; Antiviral therapy; PROPROTEIN CONVERTASE FURIN; NATURAL-HISTORY; PRECORE PROTEIN; CORE PROTEIN; IN-VIVO; INFECTION; SEROCONVERSION; THERAPY; DISEASE; IDENTIFICATION;
D O I：
10.1186/1743-422X-11-165
中图分类号：
Q93 [微生物学];
学科分类号：
071005 ; 100705 ;
摘要：
Background: The antiviral therapy of chronic hepatitis B virus (HBV) infection pursues the dual goals, virological response (undetectable serum HBV DNA) and hepatitis B e antigen (HBeAg) serological response (serum HBeAg loss/seroconversion). It is relatively difficult, however, to realize the serological response, especially for nucleotide/nucleoside analogs. Furin, a proprotein convertase, is involved in HBeAg maturation. The suppression of furin using inhibitors accordingly reduces HBeAg secretion, but possibly enhances HBV replication. For these reasons, the strategy based on the combination of nucleoside analog entecavir (ETV) and furin inhibitors to inhibit HBV replication and HBeAg secretion simultaneously were studied here. Methods: The suppression of furin was performed using inhibitors decanoyl-RVKR-chloromethylketone (CMK) and hexa-D-arginine (D6R) or the expression of furin inhibitory prosegment. The influence of furin suppression on HBV replication and the effect of CMK combined with nucleoside analog entecavir (ETV) on HBV replication and HBeAg secretion was investigated in HepG2.2.15 cells. HBeAg level in media was detected using enzyme-linked immunosorbent assay. Intracellular viral antigens and HBV DNA were detected using Western and Southern blotting analyses, respectively. Results: CMK, D6R and the expression of inhibitory prosegment all significantly reduced HBeAg secretion, but only CMK enhance HBV replication. Concordantly, only CMK post-transcriptionally accumulated cytosolic HBV replication-essential hepatitis B core antigen (HBcAg). The HBcAg-accumulating effect of CMK was further found to be resulted from its redundant inhibitory effect on the trypsin-like activity of cellular proteasomes that are responsible for HBcAg degradation. Moreover, the viral replication-enhancing effect of CMK was abrogated by ETV and ETV combined with CMK reduced HBV replication and HBeAg secretion simultaneously. Conclusion: The suppression of furin itself does not enhance HBV replication. Nucleotide/nucleoside analogs combined with furin inhibitors may be a potential easy way to realize the dual goals of the antiviral therapy for chronic hepatitis B in the future.
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页数：9
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