Neutrophil Collagenase in Sepsis and Ventilator Induced Lung Injury

脓毒症和呼吸机引起的肺损伤中的中性粒细胞胶原酶

基本信息

批准号：
7662659
负责人：
A. Murat Kaynar
金额：
$ 12.05万
依托单位：
UNIVERSITY OF PITTSBURGH AT PITTSBURGH
依托单位国家：
美国
项目类别：
财政年份：
2009
资助国家：
美国
起止时间：
2009-09-17 至 2014-07-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/7662659
关键词：
Acute Acute Lung Injury Address Adult Respiratory Distress Syndrome Anti-Inflammatory Agents Anti-inflammatory Attenuated Bacteria Biological Biology Blood Bone Marrow Transplantation Bronchoalveolar Lavage Cells Chemotaxis Critical Care Cytology Data Development Disease model Dose Fostering Gene Targeting Goals Hand Hematopoietic In Vitro Individual Infection Inflammation Inflammatory Injury Laboratories Lead Ligation Lipopolysaccharides Lung Lung diseases Macrophage Inflammatory Proteins Matrix Metalloproteinases Measures Mechanical ventilation Mediating Medicine Mentors Mentorship Modeling Morbidity - disease rate Multiple Organ Failure Mus Neutrophil Collagenase Organ Outcome Pathogenesis Patients Pattern Peptide Hydrolases Peritoneal Peritoneal lavage Peritoneum Phagocytosis Play Predisposition Principal Investigator Process Property Proteomics Puncture procedure Research Research Proposals Resolution Resources Role Sampling Scientist Secondary to Sepsis Sepsis Syndrome Severities Site Societies Source Structure of parenchyma of lung Supportive care System Systemic infection Testing Therapeutic Tidal Volume Time Tissues Training Programs Universities Ventilator-induced lung injury Wild Type Mouse Work base career chemokine clinically relevant cytokine design effective therapy high risk improved insight killings lung injury migration mortality mouse model neutrophil novel prevent proteinase In reconstitution research study response

项目摘要

DESCRIPTION (provided by applicant): Sepsis is a major cause of morbidity and mortality occurring in around 700,000 individuals per year in US. Acute lung injury (All) in patients with sepsis is common, and carries a high mortality (-40%). Adequate and timely neutrophil response to the site of infection could limit sepsis in patients, yet uncontrolled accumulation of these cells could also lead to end-organ damage, one of the major reasons for multiple organ failure, including ALL Chemotaxis of neutrophils to the site of infection or inflammation are essential to this process. In this proposal we are going to study the central role of matrix metalloproteinase (MMP)-8 in neutrophil chemotaxis in models of sepsis, ventilator-induced lung injury (VILI) and the combination of sepsis-induced lung injury with subsequent VILI. Our preliminary data suggests that MMP-8 limits the neutrophil chemotaxis into sites of inflammation/infection. This property of MMP-8 is deleterious in our sepsis model of cecal- ligation and puncture, where the MMP-8 deficient mice had a significant survival advantage. On the other hand, the lack of MMP-8 led to inappropriate accumulation of neutrophils in the lung tissues in mice on mechanical ventilation and led to significant VILI. The research proposal will serve as a training program for the applicant with a focus on MMP-8 biology in the setting of clinically relevant questions, a perfect fit for a candidate on the path of becoming a clinician-scientist. This application takes advantage of the diversity of resources available within the Department of Medicine and Critical Care Medicine at the University of Pittsburgh to provide the principal investigator with a unique training program designed to foster a successful research career under the mentorship of Dr. Steven D. Shapiro. The experimental approach is unique in that it utilizes a murine model of (i) extra-pulmonary sepsis, (ii) ventilator-induced lung injury, and (iii) the modulating effects of concomitant mechanical ventilation in the setting of sepsis-related ALI to study the role of MMP-8. Specific aims include: 1) mechanism of MMP-8 dependent bacterial clearance in a sepsis model, 2) role of MMP-8 in VILI, and 3) MMP-8 dependent cytokine inactivation, including proteomic approaches. Results are expected to yield fundamental insights into the MMP-8 biology in clinically relevant disease models and possibly provide the basis for development of novel anti-inflammatory therapeutic strategies for sepsis and ALI. Acute lung injury in the setting of systemic infection and inflammation such as sepsis carries a high risk for mortality. In this proposal, we will study a key molecule, namely matrix metalloproteinase (MMP)-8 in mouse models of sepsis, acute lung injury and the possible injury inflicted by the use of mechanical ventilation.

描述（由申请人提供）：脓毒症是美国每年约 700,000 人发病和死亡的主要原因。脓毒症患者的急性肺损伤（全部）很常见，死亡率很高（-40%）。中性粒细胞对感染部位的充分和及时的反应可以限制患者的败血症，但这些细胞不受控制的积累也可能导致终末器官损伤，这是多器官衰竭的主要原因之一，包括所有中性粒细胞向感染部位的趋化性感染或炎症对于这个过程至关重要。在本提案中，我们将研究基质金属蛋白酶 (MMP)-8 在脓毒症、呼吸机引起的肺损伤 (VILI) 模型以及脓毒症引起的肺损伤与后续 VILI 相结合的模型中中性粒细胞趋化中的核心作用。我们的初步数据表明，MMP-8 限制中性粒细胞趋化至炎症/感染部位。 MMP-8 的这一特性在我们的盲肠结扎和穿刺脓毒症模型中是有害的，其中 MMP-8 缺陷的小鼠具有显着的生存优势。另一方面，MMP-8的缺乏导致机械通气小鼠肺组织中中性粒细胞的不适当积累，并导致严重的VILI。该研究计划将作为申请人的培训计划，重点关注临床相关问题中的 MMP-8 生物学，非常适合正在成为临床医生科学家的候选人。该应用程序利用匹兹堡大学医学和重症监护医学系内可用的资源多样性，为首席研究员提供独特的培训计划，旨在在 Steven D. 博士的指导下促进成功的研究生涯。夏皮罗。该实验方法的独特之处在于它利用了以下小鼠模型：（i）肺外脓毒症，（ii）呼吸机引起的肺损伤，以及（iii）脓毒症相关 ALI 中伴随机械通气的调节作用研究MMP-8的作用。具体目标包括：1) 脓毒症模型中 MMP-8 依赖性细菌清除机制，2) MMP-8 在 VILI 中的作用，3) MMP-8 依赖性细胞因子失活，包括蛋白质组学方法。预计结果将为临床相关疾病模型中的 MMP-8 生物学提供基础见解，并可能为脓毒症和 ALI 的新型抗炎治疗策略的开发提供基础。全身感染和炎症（如脓毒症）引起的急性肺损伤具有很高的死亡风险。在本提案中，我们将在脓毒症、急性肺损伤以及使用机械通气可能造成的损伤的小鼠模型中研究一种关键分子，即基质金属蛋白酶（MMP）-8。