Evaluation of therapeutic benefits of HBV nucleocapsid assembly inhibitors

乙型肝炎病毒核衣壳组装抑制剂的治疗效果评估

• 批准号: 9069416
• 负责人: Yanming Du
• 金额: $ 57.86万
• 依托单位: BARUCH S. BLUMBERG INSTITUTE
• 依托单位国家: 美国
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-06-01 至 2019-05-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9069416
• 关键词: Animal Model; Antiviral Agents; Antiviral Response; Antiviral Therapy; Benzamides; Biological; Biological Availability; Capsid; Capsid Proteins; Chemicals; Chronic Hepatitis B; Circular DNA; Clinical; Combined Modality Therapy; Complement; Complex; Core Protein; DNA Polymerase Inhibitor; DNA biosynthesis; DNA-Directed DNA Polymerase; Development; Drug Kinetics; Excretory function; FDA approved; Goals; Health; Hepadnaviridae; Hepatitis B; Hepatitis B Virus; Hepatocyte; Human; Immune; Immune response; In Vitro; Kinetics; Knowledge; Laboratories; Late Effects; Lead; Maximum Tolerated Dose; Metabolism; Modification; Molecular; Mono-S; Mus; Nucleocapsid; Pathway interactions; Pharmaceutical Preparations; Pharmacotherapy; Process; Production; RNA; RNA-Directed DNA Polymerase; Reporting; Research; Resistance; Safety; Testing; Therapeutic; Therapeutic Agents; Time; Transcriptional Regulation; Viral Genome; Virion; Virus Assembly; Virus Replication; Woodchuck; Woodchuck Hepatitis B Virus; Work; absorption; cytotoxicity; design; drug candidate; entecavir; hepatoma cell; in vivo; inhibitor/antagonist; insight; mutant; nucleoside analog; pgRNA; pre-clinical; response; scale up; therapeutic evaluation; viral DNA; virus host interaction

DESCRIPTION (provided by applicant): This is a proposal to determine the feasibility and therapeutic benefits of newly discovered benzamide derivatives (BAs) as mono-therapeutic agents or in combination with nucleoside analogues for the treatment of chronic hepatitis B. BAs were identified in our laboratory as inhibitors of hepatitis B virus (HBV) pregenomic (pg) RNA encapsidation, which is essential for the subsequent viral DNA synthesis. They are mechanistically distinct from, and should thus complement, the currently FDA-approved antiviral medications. In addition, inhibition of pgRNA encapsidation, or the nucleocapsid assembly, should not only preclude HBV genome replication and virion production, it might also disrupt the metabolism of HBV pgRNA-reverse transcriptase (RT) complex and core protein, which could consequentially interfere with the host innate antiviral immune response and cccDNA function in the infected hepatocytes. Unlike other pgRNA encapsidation inhibitors reported thus far, our benzamide pgRNA encapsidation inhibitors also effectively inhibit woodchuck hepatitis virus (WHV), which allows for the evaluation of the therapeutic benefits of this class of antivirals in a hepadnavirus chronically infected animal model for the first time. We, therefore, propose in this project to perform further lead optimization, and advance compounds with the most favorable ADME, safety and pharmacokinetic (PK) profiles for antiviral efficacy study in the WHV-infected woodchucks in vivo. Meanwhile, we will continue our efforts toward understanding the molecular mechanism by which BAs inhibit HBV nucleocapsid assembly and their consequential impacts on the interaction between HBV and its host hepatocytes. At the completion of this project, we will have a better understanding of the potential clinical benefits of pgRNA encapsidation-targeted antiviral therapy, either alone or in combination with nucleoside analogues in particular, and strategic insights in to the development of antiviral regimes for the cure of chronic hepatitis B infection in general. A decision on further preclinical/clinical development of the lead BAs compounds will be made accordingly.

描述（由申请人提供）：这是一项确定新发现的苯甲酰胺衍生物（BA）作为单一治疗药物或与核苷类似物联合治疗慢性乙型肝炎的可行性和治疗益处的提案。BA在我们的研究中被鉴定。实验室作为乙型肝炎病毒 (HBV) 前基因组 (pg) RNA 衣壳化的抑制剂，这对于随后的病毒 DNA 合成至关重要。它们在机制上不同于目前 FDA 批准的抗病毒药物，因此应该补充它们。此外，抑制 pgRNA 衣壳化或核衣壳组装不仅会阻止 HBV 基因组复制和病毒颗粒产生，还可能破坏 HBV pgRNA-逆转录酶 (RT) 复合物和核心蛋白的代谢，从而干扰宿主先天抗病毒免疫反应和受感染肝细胞中的 cccDNA 功能。与迄今为止报道的其他 pgRNA 衣壳化抑制剂不同，我们的苯甲酰胺 pgRNA 衣壳化抑制剂还可以有效抑制土拨鼠肝炎病毒 (WHV)，这使得可以评估此​​类抗病毒药物的治疗效果。 首次建立嗜肝DNA病毒慢性感染动物模型。因此，我们建议在该项目中进一步进行先导化合物优化，并开发具有最有利的 ADME、安全性和药代动力学 (PK) 特征的化合物，用于 WHV 感染土拨鼠体内的抗病毒功效研究。同时，我们将继续努力了解BAs抑制HBV核衣壳组装的分子机制及其对HBV与其宿主肝细胞之间相互作用的影响。该项目完成后，我们将更好地了解 pgRNA 衣壳化靶向抗病毒疗法的潜在临床益处，无论是单独使用还是与核苷类似物联合使用，特别是， 以及开发治疗慢性肝炎的抗病毒方案的战略见解 一般感染B。将相应地做出有关先导 BA 化合物的进一步临床前/临床开发的决定。