增强乙型肝炎病毒的表观遗传抑制由干扰素-α和小干扰RNA协同作用的共闭环形DNA
Kongying Hu1, Wenjing Zai1, Mingzhu Xu1
1Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS), Research Unit of Cure of Chronic Hepatitis B Virus Infection (CAMS), Shanghai Frontiers Science Center of Pathogenic Microbes and Infection, School of Basic Medical Sciences, Shanghai Medical College Fudan University, Shanghai, China.
mBio
|November 21, 2024
概括
使用干扰素 (IFN) 和小干扰RNA (siRNA) 的组合疗法提供了一种强有力的策略,可以在表观遗传上抑制乙型肝炎病毒 (HBV) 协同封闭圆形DNA (cccDNA) 持久性. 这种方法在临床前模型中显示,与单一治疗相比,病毒活动的抑制效果优越且持续.
科学领域:
- 肝病学 肝病学是一种肝病学.
- 病毒学 病毒学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 乙型肝炎病毒 (HBV) 的共闭环形DNA (cccDNA) 持久性是实现功能治愈的主要障碍.
- 目前的治疗策略很难有效地准和沉默ccccDNA,从而限制了治疗的有效性.
研究的目的:
- 综合评估干扰素α (IFNα) 和小干扰RNA (siRNA) 对HBVccDNA活性,可访问性和表观遗传状态的联合抑制作用.
- 使用细胞和小鼠模型,比较组合治疗与单一治疗的疗效.
主要方法:
- 使用了携带HBVcccDNA的细胞和小鼠模型.
- 使用的IFNα2,HBx向性siRNA (siHBx),以及它们的组合.
- 评估病毒RNA和抗原水平,SMC5/6染色体调节器复制,ccDNA表观遗传修饰 (H3Ac,H4Ac) 和ccDNA可访问性.
- 使用人性化的IFNAR小鼠模型在体内验证基化IFNα2和GalNac-siHBx组合.
主要成果:
- 单独使用IFNα治疗可使病毒标志物减少50%左右,并部分恢复SMC5/6.5.
- siHBx显著抑制病毒抗原并恢复SMC5/6,但效应是可逆的.
- 结合疗法实现了>95%的病毒标记抑制,减少了ccccDNA上的表观遗传激活标记,并降低了ccccDNA的可访问性,具有持续的影响.
- 在体内研究证实了组合治疗的优越和持久的ccccDNA活性抑制.
结论:
- 与单独治疗相比,IFNα和siRNA的组合提供了更强大和更持久的HBVccDNA表观遗传抑制.
- 这些发现支持开发组合疗法,以获得更有效的HBV功能治愈.
- 这项研究增强了对ccDNA表观遗传调制及其治疗向的理解.
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