Neutrophil recruitment to sites of inflammation is a multi-step process mediated by the interactions between several receptors and ligands. Although the major receptors and ligands mediating neutrophil-endothelial cell interactions have been identified, it remains poorly understood how receptor-ligand interactions are regulated under inflammatory conditions. This project will provide novel fundamental knowledge of how neutrophil surface- localized ERO1?-thiol isomerase complexes target allosteric disulfide bonds in different surface receptors and promote the ligand-binding function under inflammatory conditions. Our preliminary data demonstrated that neutrophil surface-bound ERp57 and PDI cooperatively and distinctly regulate the process of neutrophil recruitment and extracellular ERO1? coordinates this regulatory mechanism. Using biochemical, cellular, and in vivo studies with novel blocking antibodies, peptides and mouse models, we will test the hypothesis that two structurally-similar thiol isomerases, ERp57 and PDI and their oxidase ERO1? facilitate modification of allosteric disulfide bonds in different surface molecules and enhance neutrophil adhesive function, contributing to tissue damage under thromboinflammatory conditions.
In Aim 1, we will determine how PDI and ERp57 distinctly regulate the adhesive function of different neutrophil receptors. Also, we will test whether extracellular ERO1? controls the activity of those thiol isomerases.
In Aim 2, we will test how inflammatory environments influence the function of extracellular PDI, ERp57 and ERO1?.
In Aim 3, using in vivo live imaging techniques, we will study the pathological roles of extracellular PDI, ERp57 and ERO1? in intravascular cell-cell interactions and tissue damage in thromboinflammation. Our studies will provide insights into novel molecular and cellular mechanisms of neutrophil-endothelial cell interactions, which can be used to design new strategies for the treatment of thromboinflammatory disease.

Public Health Relevance

The goal of the proposed studies is to study the molecular and cellular mechanisms whereby extracellular ERp57 and PDI in concert with their oxidase ERO1? regulate neutrophil adhesive function cooperatively and distinctly, contributing to neutrophil recruitment and tissue damage under inflammatory conditions. This project will provide important evidence that extracellular ERO1?-thiol isomerase redox-relay signaling occurs outside activated neutrophils and targeting the signaling pathway will effectively block excessive neutrophil recruitment to sites of thromboinflammation.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
2R01HL130028-05
Application #
9862840
Study Section
Atherosclerosis and Inflammation of the Cardiovascular System Study Section (AICS)
Program Officer
Charette, Marc F
Project Start
2016-09-01
Project End
2025-06-30
Budget Start
2020-07-01
Budget End
2021-06-30
Support Year
5
Fiscal Year
2020
Total Cost
Indirect Cost
Name
University of Illinois at Chicago
Department
Pharmacology
Type
Schools of Medicine
DUNS #
098987217
City
Chicago
State
IL
Country
United States
Zip Code
60612
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Tseng, Alan; Kim, Kyungho; Li, Jing et al. (2018) Myeloperoxidase Negatively Regulates Neutrophil-Endothelial Cell Interactions by Impairing ?M?2 Integrin Function in Sterile Inflammation. Front Med (Lausanne) 5:134
Kim, Young-Mee; Youn, Seock-Won; Sudhahar, Varadarajan et al. (2018) Redox Regulation of Mitochondrial Fission Protein Drp1 by Protein Disulfide Isomerase Limits Endothelial Senescence. Cell Rep 23:3565-3578
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Cho, Jaehyung (2017) Downstream Regulatory Element Antagonist Modulator (DREAM), a target for anti-thrombotic agents. Pharmacol Res 117:283-287
Kim, Kyungho; Tseng, Alan; Barazia, Andrew et al. (2017) DREAM plays an important role in platelet activation and thrombogenesis. Blood 129:209-225
Kim, Kyungho; Li, Jing; Barazia, Andrew et al. (2017) ARQ 092, an orally-available, selective AKT inhibitor, attenuates neutrophil-platelet interactions in sickle cell disease. Haematologica 102:246-259