Engineered anti-PDL1 with IFNα targets both immunoinhibitory and activating signals in the liver to break HBV immune tolerance
Chao-Yang Meng 1 , Shiyu Sun 1 , Yong Liang 2 , Hairong Xu 1 , Chao Zhang 3 , Min Zhang 4 , Fu-Sheng Wang 3 , Yang-Xin Fu 5 , Hua Peng 6
Affiliations
Affiliations
1
Key Laboratory of Infection and Immunity, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.
2
Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China.
3
Senior Department of Infectious Diseases, 5th Medical Center of Chinese PLA General Hospital, Beijing, China.
4
Senior Department of Liver Disease, 5th Medical Center of Chinese PLA General Hospital, Beijing, China.
5
Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China [email protected][email protected].
6
Key Laboratory of Infection and Immunity, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China [email protected][email protected].
PMID: 36316098 DOI: 10.1136/gutjnl-2022-327059
Free article
Abstract
Objective: The purpose of this study is to develop an anti-PDL1-based interferon (IFN) fusion protein to overcome the chronic hepatitis B virus (HBV)-induced immune tolerance, and combine this immunotherapy with a HBV vaccine to achieve the functional cure of chronic hepatitis B (CHB) infection.
Design: We designed an anti-PDL1-IFNα heterodimeric fusion protein, in which one arm was derived from anti-PDL1 antibody and the other arm was IFNα, to allow targeted delivery of IFNα into the liver by anti-PDL1 antibody. The effect of the anti-PDL1-IFNα heterodimer on overcoming hepatitis B surface antigen (HBsAg) vaccine resistance was evaluated in chronic HBV carrier mice.
Results: The anti-PDL1-IFNα heterodimer preferentially targeted the liver and resulted in viral suppression, the PD1/PDL1 immune checkpoint blockade and dendritic cell activation/antigen presentation to activate HBsAg-specific T cells, thus breaking immune tolerance in chronic HBV carrier mice. When an HBsAg vaccine was administered soon after anti-PDL1-IFNα heterodimer treatment, we observed strong anti-HBsAg antibody and HBsAg-specific T cell responses for efficient HBsAg clearance in chronic HBV carrier mice that received the combination treatment but not in those that received either single treatment.
Conclusions: Targeting the liver with an engineered anti-PDL1-IFNα heterodimer can break HBV-induced immune tolerance to an HBsAg vaccine, offering a promising translatable therapeutic strategy for the functional cure of CHB.
有关于 Vir-2218(一种 sIRNA)、Vir-3434(一种 HBsAg 单克隆抗体)和组合(包括干扰素)的新闻. https://investors.vir.bio/static ... 6-b714-ca4316cd2f56
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结果总结
• 长达 20 周的 VIR-2218 和 VIR-3434 联合方案通常具有良好的耐受性,并且
与大多数轻微的不良事件相关
• VIR-2218 和 VIR-3434 联合方案实现平均 HBsAg 降低 > 2.5 log10 IU/mL
在所有队列中,大多数参与者的绝对 HBsAg 水平 < 10 IU/mL
• 反应模式表明 HBsAg 从互补模式中的附加降低
VIR-2218 和 VIR-3434 的作用
关键要点
• VIR-2218 加 VIR-3434 的组合实现的 HBsAg 下降是在
迄今为止最大的新型 HBV 疗法
• 这些数据支持对包含 VIR-2218 和
VIR-3434 用于慢性 HBV 感染的功能性治愈
• 反应模式表明,更长的治疗时间可能会进一步减少
在 HBsAg
• 使用 VIR-2218 加 VIR-3434 或 VIR-3434 评估更长治疗时间的队列
单一疗法,以及评估干扰素添加的方案,目前正在招募
这项正在进行的试验(NCT04856085)
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Summary of Results
• VIR-2218 and VIR-3434 combination regimens up to 20 weeks were generally well tolerated and
associated with mostly mild adverse events
• VIR-2218 and VIR-3434 combination regimens achieved mean HBsAg reductions > 2.5 log10 IU/mL
in all cohorts, and absolute HBsAg levels < 10 IU/mL were achieved in most participants
• Patterns of response demonstrate additive HBsAg reduction from the complementary modes of
action of VIR-2218 and VIR-3434
Key Takeaways
• The HBsAg declines achieved with the combination of VIR-2218 plus VIR-3434 are among the
largest seen to date with novel HBV therapies
• These data support the continued evaluation of combination regimens containing VIR-2218 and
VIR-3434 for the functional cure of chronic HBV infection
• Patterns of response suggest that longer durations of treatment may achieve additional reduction
in HBsAg
• Cohorts evaluating longer durations of treatment with VIR-2218 plus VIR-3434 or VIR-3434
monotherapy, as well as regimens evaluating the addition of interferon, are currently recruiting in
this ongoing trial (NCT04856085)作者: StephenW 时间: 2022-11-7 15:26
关键要点
• 较长时间(48 周)的 VIR-2218 与 PEG-IFNα 治疗可实现更高的
治疗结束时 HBsAg 血清学清除和抗 HBs 血清学转换(30.8%)
• PEG-IFNα 可能增强 VIR-2218 的抗病毒活性,支持未来评估
与免疫调节剂组合
• 研究正在进行中,参与者正在被进一步跟踪
Vir-2218 + 干扰素
Summary of Results
• VIR-2218 alone or in combination with PEG-IFNα was generally well-tolerated
– Majority of TEAEs were Grade 1 or 2
• Ten participants across all cohorts receiving VIR-2218 and PEG-IFNα achieved HBsAg
seroclearance by Week 48
– 9 of the 10 participants achieved anti-HBs levels >10 mIU/mL
• Longer duration of concurrently initiated VIR-2218 and PEG-IFNα regimen (Cohort 5) resulted in
– 30.8% participants achieved HBsAg seroclearance and anti-HBs seroconversion
– Deepest mean HBsAg reductions (-2.9 Log10 IU/mL) at EOT
Key Takeaways
• Longer duration (48 weeks) of VIR-2218 with PEG-IFNα treatment achieves higher rates of
HBsAg seroclearance with anti-HBs seroconversion by end of treatment (30.8%)
• Antiviral activity of VIR-2218 may be potentiated by PEG-IFNα, supporting future evaluation of
combination with immunomodulators
• Study is ongoing and participants are being followed further作者: StephenW 时间: 2022-11-7 15:32
单剂量 VIR-3434(一种研究中和单克隆抗体)给药后乙型肝炎病毒 DNA 和乙型肝炎表面抗原的减少:病毒血症人群的首次体验
AASLD 2022 年 11 月 4 日至 8 日
Kosh Agarwal,1 Man-Fung Yuen,2 Heiner Wedemeyer,3 Daniel Cloutier,4 Ling Shen,4 Andre Arizpe,4 Sneha V. Gupta,4
Marie Fanget、4 Lillian Seu、4 Andrea L. Cathcart、4 Audrey H. Lau、4 Carey Hwang、4 Edward Gane5
1 英国伦敦国王学院医院肝脏研究所; 2大学玛丽医院
香港,香港,中国; 3德国汉诺威医学院胃肠病学、肝病学和内分泌学系; 4Vir Biotechnology, Inc.,旧金山,加利福尼亚州,美国; 5奥克兰大学医学院,奥克兰,新西兰
Reduction in Hepatitis B Viral DNA and Hepatitis B Surface Antigen Following Administration of a Single Dose of VIR-3434, an Investigational Neutralizing Monoclonal Antibody: First Experience in a Population With Viremia
AASLD Nov 4-8 2022
Kosh Agarwal,1 Man-Fung Yuen,2 Heiner Wedemeyer,3 Daniel Cloutier,4 Ling Shen,4 Andre Arizpe,4 Sneha V. Gupta,4
Marie Fanget,4 Lillian Seu,4 Andrea L. Cathcart,4 Audrey H. Lau,4 Carey Hwang,4 Edward Gane5
1Institute of Liver Studies, King’s College Hospital, London, United Kingdom; 2Queen Mary Hospital, The University
of Hong Kong, Hong Kong, China; 3Department of Gastroenterology, Hepatology, and Endocrinology, Hannover Medical School, Hannover, Germany; 4Vir Biotechnology, Inc., San Francisco, CA, USA; 5Faculty of Medicine, University of Auckland, Auckland, New Zealand作者: newchinabok 时间: 2022-11-7 15:41