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Myeloid sphingolipid regulation of tissue resolution and regeneration responses

骨髓鞘脂对组织分辨率和再生反应的调节

基本信息

批准号：
10562518
负责人：
Timothy Tun Hla
金额：
$ 57.66万
依托单位：
BOSTON CHILDREN'S HOSPITAL
依托单位国家：
美国
项目类别：
财政年份：
2022
资助国家：
美国
起止时间：
2022-09-21 至 2027-07-31
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10562518
关键词：
Acetaminophen Acute Liver Failure Agonist Anti-Inflammatory Agents Atherosclerosis Attenuated Autoimmune Diseases Biological Blood Vessels CXCR4 gene Cells Chemicals Chromatin Chronic Complex Coupled Cytoplasmic Granules Data Development Disease Eicosanoids Engineering Epithelial Event Exhibits FDA approved FPR2 gene Fibrosis Foundations Functional disorder G protein coupled receptor kinase G-Protein-Coupled Receptors GTP-Binding Protein alpha Subunits, Gs GTP-Binding Proteins Gene Expression Genetic Genetic Models Genetic Transcription Goals Health Health system Hematopoietic Hepatocyte High Density Lipoproteins Homeostasis Homing Immune Inflammation Inflammatory Inflammatory Response Injury Innate Immune System Knowledge LTB4R gene Laboratories Lead Liver Lung Lysophospholipids Mediating Medicine Methods Molecular Molecular Chaperones Myelogenous Myeloid Cells Natural regeneration Neutrophil Activation Nuclear Organ Pathology Pathway interactions Phagocytosis Pharmaceutical Preparations Pharmacology Phase Phenotype Physiology Play Process Prostaglandins Recovery Regenerative response Regulation Research Resolution Role Seminal Signal Transduction Sphingolipids Sphingosine-1-Phosphate Receptor Testing Therapeutic Time Tissues Transgenic Mice Vascular Endothelium Viral Virus Virus Diseases Work antagonist attenuation base beta-arrestin body system chronic inflammatory disease desensitization extracellular innovation lipid mediator liver injury lung injury lung regeneration macrophage mouse genetics mouse model neutrophil novel novel strategies novel therapeutic intervention oxidant stress particle programs receptor regenerative repair repaired response single-cell RNA sequencing small molecule sphingosine 1-phosphate targeted treatment tissue injury tissue regeneration trafficking transcriptome

项目摘要

SUMMARY Myeloid cells of the innate immune system (neutrophils and macrophages) interact closely with the vascular endothelium to modulate inflammatory and resolution responses. During early stages of the inflammatory response, inappropriate neutrophils activation causes vascular and parenchymal injury. However, in late stages of inflammation, precisely-controlled neutrophil resolution mechanisms are now considered to be critical to limit tissue damage and initiate regeneration of new vascular channels and parenchymal tissues. Even though neutrophil function in early stages of inflammatory processes is well understood, their involvement in resolution responses is poorly understood. We have found that the sphingosine 1-phosphate (S1P) receptor-1 (S1PR1), a G protein-coupled receptor (GPCR) with well-established functions in vascular and adaptive immune (T and B) cells, regulates neutrophil resolution responses. Specifically, S1PR1 signaling induces a non-inflammatory, long-lived neutrophil phenotype that undergoes efficient phagocytosis. We also found that this novel and unappreciated function of neutrophil S1PR1 signaling axis is critical for efficient recovery from virus-induced lung injury and chemical-induced acute liver failure. To activate this beneficial process, we developed a novel biologic based on our knowledge of S1P chaperones. We hypothesize that local S1PR1 signaling in neutrophils is a general mechanism that resolves inflammatory tissue injury and thus enable vascular and parenchymal regeneration in multiple organ systems. Furthermore, we posit that therapeutic activation of this signaling axis may provide a novel strategy to control chronic smoldering inflammation that lead to fibrotic diseases and organ dysfunction. To test this hypothesis, we will examine GPCR proximal mechanisms and nuclear transcriptional events that are regulated by S1PR1 in tissue neutrophils during resolution responses. Second, we will examine the importance of this signaling axis in resolution responses that are induced after virus-induced lung injury and chemical-induced liver injury in mouse models. Third, we will obtain proof-of-concept data to activate this signaling axis that utilize engineered designer HDL particles that contain ApoA1 and ApoM to stimulate neutrophil resolution responses and enhance vascular endothelial survival and regeneration. These data are anticipated to reveal novel mechanisms of resolution processes and enable innovative therapeutic strategies to control chronic inflammatory diseases.

总结