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Pre-exposure Immunologic Health and Linkages to SARS-COV2 Serologic Responses, Endothelial Cell Resilience, and Cardiovascular Complications: Defining the mechanistic basis of high risk endotypes.

暴露前免疫健康及其与 SARS-COV2 血清学反应、内皮细胞弹性和心血管并发症的联系：定义高风险内型的机制基础。

基本信息

批准号：
10855043
负责人：
Timothy An-thy Chan
金额：
$ 80.69万
依托单位：
CASE WESTERN RESERVE UNIVERSITY
依托单位国家：
美国
项目类别：
财政年份：
2020
资助国家：
美国
起止时间：
2020-09-30 至 2024-11-30
项目状态：
已结题

项目摘要

Abstract The objective of this proposal is to understand the immunologic foundations of heart disease which can occur as a result of COVID19. Cardiac impairment, when it develops is often fatal, and our hypothesis is that the maintenance of endothelial function is critical to surviving the protracted nature of COVID19 pneumonia, especially in those with reduced or delayed antibody responses. Our first aim will be to analyze those differences in immune function which pre-date infection but appear to impact the risk of fatal COVID. This will be done by enrolling those at high risk for developing COVID19 (frontline healthcare workers), and performing serially assessments of their immunologic function if they develop COVID. We will specifically investigate the mechanisms that link pre-infection inflammatory pathways to protective serologic responses and symptom severity and recovery. Our second aim will be to perform in vitro experiments to assess the requirements for endothelial cell dysfunction and infectivity. We will compare various inflammatory and cardiovascular stimuli which seem to play a role in promoting COVID19-related cardiovascular complications. Our third aim is to characterize immune cells, endothelial cells, and cardiomyocytes in heart tissue from those with COVID19-induced left ventricular dysfunction. Using single cell sequencing techniques, we will determine cellular and molecular signatures that characterize the microenvironment of the COVID19-affected heart, compared to appropriate controls. Our conceptual model is that pre-existing immune dysfunction 1) reduces the efficiency of neutralizing antibody responses, and 2) in conjunction with cardiovascular disease risk factors, induces endothelial downregulation/depletion of nodal regulators which protect against inflammatory insults. This renders endothelial cells unable to withstand COVID-specific stimuli. Once completed, this study will provide the necessary information to improve the identification of those at risk for COVID-related heart disease and develop rationale approaches to improve the improve survival in the setting of COVID.

摘要本提案的目的是了解可能发生的心脏病的免疫学基础因为COVID 19。心脏受损，当它发展时通常是致命的，我们的假设是，维持内皮功能对于在COVID 19肺炎的长期性质中存活至关重要，特别是在那些抗体应答降低或延迟的患者中。我们的第一个目标将是分析那些在感染前出现的免疫功能差异，来影响致命的COVID的风险。这将通过招募那些患有COVID 19的高风险人群来实现（前线医护人员），并进行连续评估他们的免疫功能，如果他们发展 COVID.我们将专门研究感染前炎症通路与保护性血清学应答和症状严重程度及恢复。我们的第二个目标是进行体外实验，以评估内皮细胞的需求，功能障碍和传染性。我们将比较各种炎症和心血管刺激，在促进COVID 19相关心血管并发症中的作用。我们的第三个目标是表征心脏组织中的免疫细胞、内皮细胞和心肌细胞，患有COVID 19引起的左心室功能障碍的患者。使用单细胞测序技术，我们将确定表征受COVID 19影响的微环境的细胞和分子特征与适当的对照相比。我们的概念模型是，预先存在的免疫功能障碍1）降低了中和的效率抗体反应，2）与心血管疾病危险因素结合，诱导内皮细胞下调/耗尽保护免受炎性损伤的淋巴结调节因子。这使得内皮细胞无法承受COVID特异性刺激。一旦完成，这项研究将提供必要的信息，以改善对那些处于COVID相关心脏病风险的识别，并制定合理的方法来改善在COVID环境下的生存。