Siderophore based molecular imaging of pulmonary infections

项目摘要 慢性阻塞性肺疾病（COPD）是一种进行性的、使人衰弱的呼吸系统疾病， 由急性加重（AECOPD）打断的病程，范围从自限性发作到潮红 呼吸衰竭AECOPD最常由病毒和/或细菌感染引起。细菌 在AECOPD中通常起致病作用的微生物是假单胞菌属、克雷伯菌属、不动杆菌属和 肠杆菌属、多重耐药假单胞菌属和肺炎克雷伯菌属是引起肺炎的常见原因。 慢性阻塞性肺病住院患者的继发性肺炎。痰液颜色的变化表明 通常用作细菌感染存在的替代标志物的化脓是晚期的，不一致的， 非特异性和不敏感的生物标志物;它不能区分病毒和细菌感染， AECOPD患者根本不产生痰。有针对性的，病原体特异性的， 灵敏的成像方式，可以检测下呼吸道中的细菌并区分细菌和病毒 非侵入性感染将提高我们对AECOPD的认识， 治疗模式在这项提议中，我们打算使用这些独特的细菌膜转运蛋白， 细菌及其不同的金属载体作为PET报告探针定位和鉴定致病性活细菌 在AECOPD。我们还将评估长袍在识别共同细菌方面的特异性和灵敏度， 流感病毒（H3 N2）的感染模型。我们将进一步评估PET成像的反应性 探讨不同抗生素对几种临床分离的克雷伯氏菌的抗菌作用。肺炎假单胞菌和铜绿假单胞菌。 如果成功，探针将能够帮助识别患者的亚临床细菌定植。 与AECOPD，以确定是否最终导致感染的细菌是相同的菌株 被发现是殖民地。该项目将为一个新的技术平台奠定基础， 探索使用不同的金属载体阵列作为造影剂用于成像的可能性的途径 所有病原体感染的全部

PROJECT SUMMARY Chronic obstructive pulmonary disease (COPD) is a progressive, debilitating respiratory condition with a clinical course that is punctuated by acute exacerbations (AECOPD) ranging from self-limited episodes to florid respiratory failure. AECOPD are most often precipitated by viral and/or bacterial infections. The bacterial organisms that commonly play pathogenic role in AECOPD are Pseudomonas, Klebsiella, Acinetobacter, and Enterobacter, and multidrug resistant Pseudomonas and Klebsiella pneumoniae are a common cause of secondary pneumonias in hospitalized patients with COPD. The change in color of sputum indicative of purulence that is often used as a surrogate marker for the presence of bacterial infection is a late, inconsistent, nonspecific and insensitive biomarker; it cannot distinguish between viral and bacterial infection, and many patients with AECOPD do not produce sputum at all. The availability of a targeted, pathogen-specific and sensitive imaging modality that could detect bacteria in the lower airways and differentiation bacterial from viral infection non-invasively would advance our understanding of AECOPD and facilitate development of preemptive treatment paradigms. In this proposal, we intend on using these unique bacterial membrane transporters on bacteria, and their distinct metallophores as PET reporter probes to localize and identify pathogenic live bacteria in AECOPD. We will also evaluate the specificity and sensitivity of the robes in identifying the bacteria in co- infection models with influenza virus (H3N2). We will further evaluate the responsiveness of the PET imaging probe and modality to different antibiotics, against several clinical isolates of K. pneumoniae and P. aeruginosa. If successful, the probes would be able to assist with identifying subclinical bacterial colonization of in patients with AECOPD, to determine if the bacteria that are ultimately responsible for the infection are the same strains that was found to be colonizing. This project will lay the foundation for a new technology platform that will open avenues to explore the possibility of using the diverse array of metallophores as contrast agents for imaging the entire repertoire of pathogenic infections.