Cellular and viral determinants of the persistent HIV reservoir

持久性艾滋病毒储存库的细胞和病毒决定因素

• 批准号: 10512041
• 负责人: Nadejda S Beliakova-Bethell
• 金额: --
• 依托单位: VA SAN DIEGO HEALTHCARE SYSTEM
• 依托单位国家: 美国
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-10-01 至 2025-09-30
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10512041
• 关键词: Address; Adherence; Antibodies; Biological Assay; Biological Markers; Biological Specimen Banks; Blood; Blood specimen; CCR5 gene; CD4 Positive T Lymphocytes; CXCR4 gene; Cell model; Cells; Centers for Disease Control and Prevention (U.S.); Chronic; Clinical; Collaborations; Coupled; DNA; Data; Development; Diagnosis; Enrollment; Experimental Designs; Flow Cytometry; Future; Gene Expression; Genes; Genetic Transcription; Gifts; Goals; HIV; HIV Infections; Healthcare Systems; Heterogeneity; Human body; Immunophenotyping; In Vitro; Individual; Infection; Length; Lymphoid Tissue; Membrane Proteins; Memory; Outcome; Pathway interactions; Patients; Persons; Phenotype; Population; Proteins; Proviruses; RNA; RNA Splicing; Research; Sampling; Stimulus; T-Lymphocyte; T-Lymphocyte Subsets; Technology; Testing; Tissue Sample; Tissues; Transcript; Translating; Treatment-related toxicity; Tropism; United States; Variant; Veterans; Viral; Virus; antiretroviral therapy; biomarker identification; biomarker selection; cell type; cohort; cost; improved; in vivo; innovation; latent HIV reservoir; protein biomarkers; purge; response; single-cell RNA sequencing; transcriptome sequencing; transcriptomics; viral rebound

Eradication of the latent HIV reservoir remains the major stumbling block to achieving cure. To eliminate this reservoir, accurate definition (a biomarker) of latently infected cells of different types and within different tissues is highly needed. Several biomarkers proposed previously were able to very modestly enrich (~10-fold) for latently infected cells, but failed to capture the substantial portion of the latent reservoir. Without the detailed characterization of latently infected cells, identification of a suitable biomarker to capture the majority of the reservoir cells will remain challenging. Our long-term goal is to identify a biomarker of HIV latency that can be translated into strategies to target latently infected cells for elimination. The overall objectives of this application are to identify cellular and viral determinants of the persistent HIV reservoir and to test selected biomarkers for their ability to capture latently infected cells in vitro and ex vivo. Our central hypothesis is that a successful biomarker will be represented by reservoir determinants identified individually for cells of different phenotypes and states. The term “phenotype” refers to the canonical phenotypic subsets defined with widely used surface protein markers (for example, maturation phenotype – central memory; functional phenotype – T helper 17). The term “state” refers to a cell state more broadly defined by the cell's total transcriptomic signature: gene sets and pathways that are actively expressed. The rationale of the proposed research is the expected improvement in the efficiency of the reservoir capture when heterogeneity of the reservoir cells is taken into account. We will test our central hypothesis by pursuing the following specific aims: (1) Identify cellular determinants of different reservoir subsets and test selected biomarkers for cell enrichment in vitro; (2) Identify viral determinants of different reservoir subsets in vitro; (3) Validate the reservoir determinants and selected biomarkers using samples from people with HIV. To identify cellular and viral determinants of the persistent reservoir, latest innovations in RNA sequencing (RNA-Seq) technologies will be used. Single cell RNA-Seq coupled with immunophenotyping will be used to characterize the phenotypes and states of cells that can be infected with either CXCR4- or CCR5-tropic virus. Genes that can discriminate between latently infected and uninfected cells will be identified individually within each cell type. To inform on how the identified cellular determinants of the persistent reservoir relate to the type of provirus that they define, proviral activity in different cell types will be characterized using single cell RNA-Seq data, full length sequencing of HIV transcripts, and the PrimeFlow assay to quantify responsiveness of provirus to reactivation stimuli. Biomarkers will be selected from sets of cellular determinants of the HIV reservoir in different cell subsets. Antibodies against these proteins will be tested for the ability to efficiently capture the latently infected cells. Our ultimate goal is to ensure that identified biomarkers can accurately define latently infected cells in clinical samples, and specifically in different tissue compartments, where as much as 98% of the persistent reservoir resides in vivo. In collaboration with the Last Gift cohort, we will have a unique opportunity to conduct studies to validate the identified determinants and biomarkers using blood and lymphoid tissue samples from persons with HIV. When these studies are complete, we will have identified biomarkers that can be used to capture latently infected cells in vitro and ex vivo, with the efficiency of at least 500-fold greater than is currently achievable. These results will be significant because identified biomarkers can be used to isolate reservoir cells from different tissues to provide better characterization of the latent reservoir across the human body. In the future, these biomarkers can serve as a platform for development of strategies to target latently infected cells for elimination. Such research is important to address the needs of people living with HIV, including the large cohort of HIV- infected patients within the national VA Healthcare System.

根除潜伏的艾滋病毒储存库仍然是实现治愈的主要障碍。 储存库，不同类型和不同内部的潜伏感染细胞的准确定义（生物标志物） 之前提出的几种生物标志物能够非常适度地富集（约 10 倍）。 潜伏感染细胞，但未能捕获潜伏病毒库的大部分。 潜伏感染细胞的详细特征，识别合适的生物标志物以捕获大多数细胞 我们的长期目标是确定 HIV 潜伏期的生物标志物，这仍然具有挑战性。 可以转化为针对潜在感染细胞进行消除的策略。 应用是识别持久性HIV储存库的细胞和病毒决定因素并测试选定的 生物标志物能够在体外和离体捕获潜伏感染的细胞。 成功的生物标志物将由针对不同细胞单独识别的储存库决定因素来代表。 表型和状态 术语“表型”是指广泛定义的规范表型子集。 使用表面蛋白标记（例如，成熟表型 - 中央记忆；功能表型 - T 辅助因子 17) 术语“状态”是指由细胞的总转录组更广泛地定义的细胞状态。 签名：活跃表达的基因集和途径。拟议研究的基本原理是。 当储层细胞的异质性降低时，储层捕获效率的预期提高 我们将通过追求以下具体目标来检验我们的中心假设：（1）确定。 (2)不同储库亚群的细胞决定因素，并测试选定的体外细胞富集生物标志物； (3) 验证储层决定因素 使用艾滋病毒感染者的样本选择生物标志物来识别艾滋病毒的细胞和病毒决定因素。 持久性储存库，将使用 RNA 测序 (RNA-Seq) 技术的最新创新。 RNA-Seq 与免疫表型分析相结合将用于表征细胞的表型和状态 可以被CXCR4-或CCR5-嗜性病毒感染，这些病毒可以区分潜伏的基因。 将在每种细胞类型中单独识别感染和未感染的细胞，以告知如何识别。 持久储存库的细胞决定因素与它们定义的原病毒类型有关，原病毒活性 将使用单细胞 RNA-Seq 数据、HIV 全长测序来表征不同的细胞类型 转录本和 PrimeFlow 测定可量化原病毒对重新激活生物标志物的反应性。 将从不同细胞亚群中的HIV储存库的细胞决定簇中选择。 我们将测试针对这些蛋白质有效捕获潜伏感染细胞的能力。 目标是确保已识别的生物标志物能够准确定义临床样本中的潜伏感染细胞，以及 特别是在不同的组织隔室中，其中 98% 的持久性储存库驻留在体内。 通过与“最后的礼物”队列合作，我们将有一个独特的机会进行研究来验证 使用艾滋病毒感染者的血液和淋巴组织样本确定了决定因素和生物标志物。 这些研究已经完成，我们将确定可用于捕获潜伏感染的生物标志物 体外和离体细胞，其效率比目前可实现的至少高 500 倍。 结果将具有重要意义，因为已鉴定的生物标志物可用于从不同的细胞中分离出储存细胞。 未来，这些研究可以更好地表征人体中的潜在储存库。 生物标志物可以作为开发策略的平台，以消除潜在感染的细胞。 此类研究对于满足艾滋病毒感染者（包括大批艾滋病毒感染者）的需求非常重要。 国家 VA 医疗系统内的感染患者。