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Supraphysiologic Shear Stresses Associated with Cardiopulmonary Bypass are Sufficient to Activate RIKP3 Signaling

与心肺绕道相关的超生理剪切应力足以激活 RIKP3 信号传导

基本信息

批准号：
10606640
负责人：
VISHAL NIGAM
金额：
$ 80.16万
依托单位：
SEATTLE 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：
2022-04-11 至 2027-02-28
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10606640
关键词：
Adrenal Cortex Hormones Animal Model Biomechanics Blood Blood Cells Bypass Calcium Calcium Signaling Cardiac Surgery procedures Cardiopulmonary Bypass Cell Death Cells Cellular Structures Cessation of life Childhood Clinical Congenital Heart Defects Critical Pathways Data Drug usage Exposure to Functional disorder Gene Expression Goals Health Care Costs Impairment In Vitro Infant Inflammation Inflammatory Inflammatory Response Knowledge Leukocytes Lytic Mediating Mediator Membrane Molecular Morbidity - disease rate Myeloid Cells Neonatal Operative Surgical Procedures Organ Outcome Pathway interactions Patients Pattern Phenotype Phosphorylation Phosphotransferases Physiological Plasma Play Process Protein-Serine-Threonine Kinases Publishing RIPK3 gene Receptor Activation Research Role STIM1 gene Signal Pathway Signal Transduction Techniques Temperature Testing Tissues Translating Tube candidate identification cell cortex cytokine effectiveness evaluation experience experimental study improved outcome in vivo inhibitor insight migration monocyte mortality neonatal patient novel novel strategies palliation porcine model preclinical development receptor repaired response shear stress small molecule systemic inflammatory response treatment strategy

项目摘要

The vast majority of pediatric open-heart surgeries require the patient to be supported by cardiopulmonary bypass (CPB). Exposure to CPB causes systemic inflammation and resultant multi-organ dysfunction. Post-CPB inflammation is believed to be caused by exposure of the patient’s blood cells to the plastic tubing of the CPB circuit and unphysiological high shear stress. However, the mechanisms underlying this process are unclear. Our long-term goal is to understand how these insults contribute to post-CPB inflammation and translate this knowledge into novel treatment strategies. The scientific premise for this project is that Receptor-Interacting serine/threonine-Protein Kinase 3 (RIPK3) signaling is a novel mediator of CPB associated inflammation that can be targeted to improve outcomes for neonatal cardiac surgery patients. Data from neonatal CBP patients, a large animal model of CPB, and in vitro experiments form the basis of our scientific premise. We recently published that RIPK3 and necroptosis play a role in post-CPB inflammation. Our data demonstrate that RIPK3 plays a role in post-CPB inflammation. We established that supraphysiologic shear stresses present during CPB are sufficient to activate RIPK3 signaling in vitro and in a piglet model of CPB. Mechanistically, we found that shear stress-initiated calcium signaling pathways are critical to the activation of monocytic cells. We have identified specific pathways that can be targeted with small molecules to reduce CPB-activation of RIPK3 with goal of reducing systemic inflammatory response and organ dysfunction. We hypothesize that CPB-associated shear stress activates RIPK3 mediated inflammation. The objectives of this proposal are 1) to determine how CPB activates RIPK3 signaling, 2) elucidate how RIPK3 signaling contributes to CPB-associated inflammation/organ dysfunction, and 3) determine if blocking RIPK3 signaling is sufficient to reduce CPB- associated inflammation and organ dysfunction. Our approach will consist of two specific aims: Aim 1. Determine how shear stress activates RIPK3 signaling in circulating myeloid cells. We postulate that supraphysiologic shear stress is sufficient to activate RIPK3 signaling. We will characterize the shear stress thresholds and molecular mechanism responsible for RIPK3 activation during CPB with a focus on the roles that the cell cortex, calcium signaling cascade, and shear responsive kinases play in this response. Aim 2. Demonstrate that RIPK3 signaling mediates CPB-associated inflammation and organ dysfunction. We postulate that RIPK3 signaling is required for the inflammatory response to CPB. RIPK3 can help propagate inflammation via necroptosis, the release of cytokines, and leukocyte migration. We will perform in vitro and in vivo experiments to demonstrate that targeting RIPK3 signaling reduces CPB-associated inflammation. This research is novel and significant – elucidating how CPB activates RIPK3 signaling and necroptosis could enable a new treatment paradigm for CPB patients, improve outcomes, and reduce healthcare costs, since the proposed signaling pathways can be targeted by small molecules in clinical use or pre-clinical development.

绝大多数儿科心内直视手术都需要心肺辅助