乙型肝炎病毒中国流行株B2、C2基因型模型的人工构建与siRNA化合物评估
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四川省科技计划资助项目(2022JDRC0050);四川省科技创新苗子工程项目(2021037)


Establishment of B2 and C2 genotype models of hepatitis B virus epidemic strain in China and evaluating of siRNA compounds
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    目的 为评估对中国乙型肝炎病毒(HBV)感染人群具有潜在疗效的siRNA化合物,构建一种针对中国流行株代表性HBV的细胞模型。方法 选择中国大范围流行的1 416条B2 HBV基因组序列和1 636条C2 HBV基因组序列整合构建中国HBV参考基因组。在此基础上构建中国参考HBV体外细胞评价模型,通过考察细胞中HBV DNA和细胞上清液中HBsAg、HBeAg的表达用来评估系统是否构建成功。通过该细胞模型评估得到最优siRNA化合物,进一步在HBV 转基因小鼠体内中进行评估。结果 中国HBV参考基因组构建的两个细胞模型的HBV DNA和乙肝表面抗原(HBsAg)、乙肝e抗原(HBeAg)均能正常表达,B2型表达值分别为50 585 copies/μL、0.55 PEIU/mL、55.88 IU/mL,C2型表达值分别为45 302 copies/μL、35.31 PEIU/mL、56.9 IU/mL。通过该体外细胞模型评估得到的化合物BPR2030以3 mg/kg单次皮下注射到HBV转基因小鼠体内,小鼠血清中HBV DNA、HBsAg、HBeAg的最大抑制活性相比自身基线分别下调1.82(log10 IU/mL)、2.55(log10 IU/mL)、0.95(log10 PEIU/mL),给药后7~35 d对HBV的抑制活性均显著优于阳性参照物(P<0.05)。结论 成功构建了中国HBV流行株代表基因型表达的细胞模型,基于该细胞模型评估后得到的siRNA化合物在转基因小鼠体内表现出对HBV病毒高效的抑制活性,表明该细胞模型稳定可靠,有利于有针对性地开发更适合中国HBV患者的基因类药物

    Abstract:

    Objective In order to evaluate the potential efficacy of siRNA compounds for hepatitis B virus (HBV) infected population in China, a representative cell model for HBV in China was constructed. Methods The Chinese HBV reference genome was constructed by selected 1 416 B2 HBV genome sequences and 1 636 C2 HBV genome sequences that were epidemic in China. And on this basis, the cell model of the representative HBV in China was constructed. The expression of cellular HBV DNA and cellular supernatants hepatitis B surface antigen (HBsAg) and Hepatitis e antigen (HBeAg) was used to evaluate whether the system was successfully constructed. The siRNA compounds evaluated by this system were further tested in HBV transgenic mice. Results HBV DNA, HBsAg and HBeAg were all expressed normally in the two cell models, and the expression values of B2 type were 50 585 copies/μl, 0.55 PEIU/mL and 55.88 IU/mL. And the expression values of type C2 were 45 302 copies/μl, 35.31 PEIU/mL and 56.9 IU/mL, respectively. Compound BPR2030, which was evaluated by the B2 and C2 cell model, was injected subcutaneously into HBV transgenic mice with a single dose of 3mg/kg. The maximum expression of HBV DNA, HBsAg and HBeAg in mice serum was decreased by 1.82 (log10 IU/mL), 2.55 (log10 IU/mL) and 0.95 (log10 PEIU/mL) compared with the baseline, and the activity was significantly better than the positive control 7-35 days after dosing (P<0.05). Conclusion The Chinese representative HBV expressing cells are successfully constructed, and the siRNA evaluated by the cell model shown high activity against HBV virus in HBV transgenic mice, indicating that the cell model is stable and reliable, and favors more targeted development of gene-based drugs suitable for HBV patients in China

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  • 在线发布日期: 2025-02-19
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