Role of NOD2 in Acute Lung Injury Following Ischemic Kidney Injury

NOD2 在缺血性肾损伤后急性肺损伤中的作用

• 批准号: 10315532
• 负责人: Sean Edward DeWolf
• 金额: $ 7.51万
• 依托单位: UNIVERSITY OF CALIFORNIA, SAN DIEGO
• 依托单位国家: 美国
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-07-01 至 2025-06-30
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10315532
• 关键词: Role; NOD2; Acute; Lung; Injury

Abstract Acute respiratory distress syndrome (ARDS) is characterized by pulmonary endothelial inflammation that leads to alveolar edema and poor gas exchange. It has a high mortality, and effective treatment options to date are limited. Acute kidney injury increases the mortality from ARDS and there is substantial evidence that kidney injury can directly worsen the lung injury. The mechanisms underlying this kidney-lung interaction are not well understood and could hold therapeutic potential. Following renal ischemia reperfusion injury (IRI), endogenous stress molecules (DAMPs or damage associated molecular patterns) are released from dying renal tubular cells and bind to pathogen recognition receptors (PRRs) on neighboring cells, initiating an inflammatory cascade that worsens renal injury. In preliminary data we have already seen that renal derived DAMPs cause upregulation of inflammatory cytokines and MAPK activation in uninjured renal tubular epithelial cells. Expanding this model to kidney-lung cross talk, human pulmonary endothelial cells exposed to renal tubule-derived DAMPs were found to upregulate inflammatory cytokines and specific PRRs. These preliminary data also revealed that NOD2, a PRR known to play a key role in acute kidney injury, was disproportionately upregulated when compared to other PRRs. Our lab has previously shown that NOD2 knockout protects mice from renal IRI, and preliminary data suggest that inhibition of NOD2 via pharmacologic blockade decreases the inflammatory response of renal tubular epithelial cells to renal derived DAMPs. The hypothesis of this proposal is that NOD2 plays a critical role in lung injury following renal IRI by inducing proinflammatory responses in the pulmonary microendothelium, contributing to ARDS. Given the importance of microvascular endothelial cells in the pathogenesis of ARDS, this proposal focuses on the role of NOD2 on injurious responses in pulmonary microvascular endothelial cells after renal IRI. I will focus on the canonical NOD2 signaling pathways in pulmonary microvascular endothelial cells in response to renal derived DAMPs and also use an in vivo model of renal IRI to correlate NOD2 activation with lung injury. This proposal will provide important new knowledge and skill sets needed to set the stage for the development of my career as a physician-scientist. The work proposed in this application will be conducted in a rich training environment at UC San Diego and the Scripps Research Institute with an exceptional interdisciplinary mentoring team including leaders in the field of innate immunity, endothelial cell biology, and ARDS.

抽象的 急性呼吸窘迫综合征（ARDS）的特点是肺内皮炎症，导致 导致肺泡水肿和气体交换不良。它的死亡率很高，迄今为止有效的治疗方案是 有限的。急性肾损伤会增加 ARDS 的死亡率，并且有大量证据表明肾损伤 损伤可直接加重肺损伤。这种肾肺相互作用的机制尚不清楚 理解并具有治疗潜力。肾缺血再灌注损伤（IRI）后，内源性 垂死的肾小管细胞释放应激分子（DAMP 或损伤相关分子模式） 并与邻近细胞上的病原体识别受体（PRR）结合，引发炎症级联反应， 加重肾损伤。在初步数据中，我们已经看到肾源性 DAMP 会导致 未损伤的肾小管上皮细胞中的炎症细胞因子和 MAPK 激活。将这个模型扩展为 肾肺串扰，发现暴露于肾小管来源的 DAMP 的人肺内皮细胞 上调炎症细胞因子和特定的 PRR。这些初步数据还表明，NOD2 已知 PRR 在急性肾损伤中起关键作用，与其他药物相比，其表达不成比例地上调 PRR。我们的实验室之前已经证明 NOD2 敲除可以保护小鼠免受肾 IRI 的影响，初步数据 表明通过药物阻断抑制 NOD2 可降低肾脏炎症反应 肾小管上皮细胞转化为肾源性 DAMP。该提案的假设是NOD2发挥着关键作用 通过诱导肺微内皮细胞的促炎症反应来治疗肾 IRI 后的肺损伤， 导致ARDS。鉴于微血管内皮细胞在 ARDS 发病机制中的重要性， 该提案重点关注NOD2在肺微血管内皮细胞损伤反应中的作用 肾 IRI。我将重点关注肺微血管内皮细胞中典型的 NOD2 信号通路 对肾源性 DAMP 的反应，并使用肾 IRI 的体内模型将 NOD2 激活与 肺损伤。该提案将提供重要的新知识和技能，为未来的发展奠定基础。 我作为一名医师科学家的职业发展。本申请中提议的工作将在 加州大学圣地亚哥分校和斯克里普斯研究所拥有丰富的培训环境 跨学科指导团队，包括先天免疫、内皮细胞生物学和 ARDS。