Effects of Vagal Dysfunction on Gastrointestinal and Inflammatory Pathways in HIV

迷走神经功能障碍对 HIV 胃肠道和炎症通路的影响

• 批准号: 10819353
• 负责人: Jessica Robinson-Papp
• 金额: $ 9.95万
• 依托单位: ICAHN SCHOOL OF MEDICINE AT MOUNT SINAI
• 依托单位国家: 美国
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-02-11 至 2024-05-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/10819353
• 关键词: Acetylcholine; Acetylcholinesterase Inhibitors; Affect; Age; Bacterial Translocation; Biological Markers; Blood; Breath Tests; Chronic; Collection; Development; Disease Progression; Dose; Double-Blind Method; Eligibility Determination; Functional disorder; Gastric Acid; Gastrointestinal Transit; Gastrointestinal tract structure; Gender; Goals; Growth; HIV; HIV Infections; HIV Seronegativity; High Prevalence; Hydrogen; Hypochlorhydria; Immune; Individual; Inflammation; Inflammation Mediators; Inflammatory; Interleukin-6; Intervention; Link; Logistic Regressions; Macrophage; Macrophage Activation; Measurement; Mediating; Medical; Methane; Modification; Morbidity - disease rate; Mucous Membrane; Nerve; Neuropathy; Oral; Participant; Pathologic; Pathway interactions; Patients; Persons; Pharmaceutical Preparations; Phase; Pilot Projects; Placebos; Procedures; Process; Production; Proxy; Randomized; Research; Rodent Model; Signal Transduction; Small Intestines; Stimulus; Swab; TNF gene; Testing; Time; Vagus nerve structure; Viral; Work; antiretroviral therapy; capsule; cell motility; cholinergic; cohort; comorbidity; cytokine; follow-up; gastrointestinal; gastrointestinal function; gut microbiome; immune function; inflammatory marker; mortality; motility disorder; open label; pyridostigmine; recruit; sample collection; stool sample; vagus nerve stimulation; wireless

Project summary Chronic HIV infection produces pathologic inflammation which drives disease progression and contributes to the development of serious co-morbid medical conditions, even in the setting of effective combination antiretroviral therapy (CART); translocation of bacterial products across the gastrointestinal (GI) mucosa is a major antigenic stimulus for this process. Our research focuses on how vagal dysfunction (VD), which occurs commonly as part of HIV-associated neuropathy, affects GI and immune function in HIV. Our prior work has shown that HIV+ individuals with VD have a high prevalence of small intestinal bacterial overgrowth (SIBO), and that SIBO is associated with elevation of the pro-inflammatory cytokine IL-6, which predicts morbidity and mortality in HIV. We have also demonstrated that treatment with the acetylcholinesterase inhibitor pyridostigmine, reduces indirect markers of bacterial translocation (sCD14) and the pro-inflammatory cytokine TNFα. The current proposal builds on this work, with the overarching goal of examining vagally-mediated GI mechanisms which could contribute to chronic inflammation in individuals with well-controlled HIV. Specifically we will seek to establish that small intestinal dysmotility and hypochlorhydria mediate the relationship between VD and SIBO, and to describe the changes in the GI microbiome in PLWH with SIBO. We will also determine whether VD is associated with elevations in IL-6 and TNFα independent of SIBO, establish to what degree the strength of these relationships depend on the presence of HIV infection, and whether they are reversible using pyridostigmine and/or non-invasive vagal nerve stimulation (nVNS). To achieve these aims, we will recruit 150 HIV+ participants who will undergo autonomic function tests for VD, hydrogen methane breath testing for SIBO, Wireless Motility Capsule (WMC, Smartpill) testing for GI regional transit times and pH measurements, oral and stool sample collection for characterization of the GI microbiome, and blood draw for quantification of inflammatory biomarkers. HIV-negative controls (N=100) will undergo the same assessments. Then a subset of 96 HIV+ participants will enter one of two eight-week interventional phases followed by repetition of the same testing battery: 1) double-blind treatment with pyridostigmine vs. placebo (N=86), or 2) open label treatment with non-invasive vagal nerve stimulation (N=10). These procedures will shed light on mechanisms linking VD to immune dysregulation in HIV, and provide support for potential therapies.

项目摘要 慢性HIV感染会产生病理性炎症，导致疾病进展， 即使在有效组合的情况下，也会出现严重的合并症 抗逆转录病毒治疗（CART）;细菌产物穿过胃肠道（GI）粘膜的易位是一种 主要抗原刺激这个过程。我们的研究重点是迷走神经功能障碍（VD）， 通常作为HIV相关神经病变的一部分，影响HIV患者的GI和免疫功能。我们之前的工作 显示患有VD的HIV+个体具有小肠细菌过度生长（SIBO）的高患病率， 并且SIBO与促炎细胞因子IL-6的升高相关，其预测发病率， 艾滋病死亡率。我们还证明了用乙酰胆碱酯酶抑制剂治疗 吡啶斯的明，减少细菌易位的间接标志物（sCD 14）和促炎细胞因子 TNFα。目前的建议建立在这项工作的基础上，其总体目标是检查迷走神经介导的GI 这些机制可能导致HIV控制良好的个体的慢性炎症。具体 我们将试图建立小肠动力障碍和低氯血症介导的关系， VD和SIBO，并描述PLWH伴SIBO的GI微生物组的变化。我们还将确定 VD是否与IL-6和TNFα的升高相关，而不依赖于SIBO， 这些关系的强度取决于艾滋病毒感染的存在，以及它们是否是可逆的， 吡啶斯的明和/或非侵入性迷走神经刺激（nVNS）。为了实现这些目标，我们将招募150名 HIV+参与者将接受VD自主功能测试，氢甲烷呼吸测试， SIBO，用于GI区域通过时间和pH测量的无线运动胶囊（WMC，Smartpill）测试， 采集口腔和粪便样本以表征GI微生物组，并抽血以定量 炎症生物标志物。HIV阴性对照（N=100）将接受相同的评估。那么一个子集 的96名艾滋病毒阳性参与者将进入两个为期八周的干预阶段之一，然后重复 相同的试验组合：1）吡啶斯的明与安慰剂的双盲治疗（N=86），或2）开放标签 非侵入性迷走神经刺激治疗（N=10）。这些程序将有助于了解 将VD与HIV中的免疫失调联系起来，并为潜在的治疗提供支持。