本帖最后由 StephenW 于 2011-7-24 20:57 编辑
FIGURE 1 | The three main 'pathways' of HBV replication in HBeAg-positive patients: replication of HBV DNA, HBsAg production and HBeAg secretion.
Two major approaches for the treatment of chronic hepatitis B exist: immune-based therapies such as pegylated interferon (PEG-IFN) and antiviral nucleoside or nucleotide analogs (NAs). Orally administered NAs inhibit HBV DNA replication by blocking reverse transcription (Figure 1). This class of drug can be further categorized by degree of potency and by the barrier of the agent to the genetic development of drug resistance. Lamivudine, adefovir and telbivudine have low potency and a low genetic barrier to resistance, whereas newer agents, such as entecavir and tenofovir, are highly potent and have a high genetic barrier to resistance.3 The main goal of antiviral therapy for chronic hepatitis B is the permanent and complete suppression of active viral replication.3 In the context of the viral life cycle, NAs only block the viral DNA replication pathway (Figure 1) and have no direct inhibitory effect on the production of hepatitis B surface antigen (HBsAg), or the secretion of hepatitis B e antigen (HBeAg). By contrast, immune-based therapies such as PEG-IFN have both antiviral and immune-modulating activity.
治疗慢性肝炎的主要方法乙存在:免疫疗法,如聚乙二醇干扰素(PEG-干扰素)和抗病毒药物核苷或核苷酸类似物(NAS)。口服定居抑制HBV DNA复制,阻止反转录(图1)。这一类药物可进一步分为效力的程度和代理耐药性的基因发展的障碍。拉米夫定,阿德福韦和替比夫定有低的效价和低耐药性的基因屏障,而新制剂,如恩替卡韦和替诺福韦,高度有效的,具有高基因屏障resistance.[3]慢性乙型肝炎抗病毒治疗的主要目标是:的永久性和完整的抑制,在病毒的生命周期中的活跃病毒replication[3] NAS只阻断病毒DNA复制的途径(图1),并没有直接的抑制作用,对乙肝表面抗原(HBsAg)的生产,或B型肝炎e抗原(HBeAg)的分泌。相比之下,免疫疗法,如PEG-干扰素具有抗病毒和免疫调节活性。
Extract from:
Nature Reviews Gastroenterology and Hepatology 6, 565-567 (October 2009) | doi:10.1038/nrgastro.2009.160 Subject Categories: Hepatitis | Liver Hepatitis: Monitoring drug therapy for hepatitis B—a global challenge?Tin Nguyen1 & Stephen Locarnini2
Author affiliations- Department of Gastroenterology, St Vincent's Hospital, Fitzroy, Victoria, Australia.
- Research & Molecular Development, Victorian Infectious Diseases Reference Laboratory, North Melbourne, Victoria, Australia.
Correspondence to: S. Locarnini, Research & Molecular Development, Victorian Infectious Diseases, Reference Laboratory, North Melbourne, Victoria, Australia
Email: [email protected]
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