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dc.contributor.advisorYang, Xiao-Feng
dc.creatorLi, Xinyuan
dc.date.accessioned2020-11-04T16:10:05Z
dc.date.available2020-11-04T16:10:05Z
dc.date.issued2015
dc.identifier.other931912162
dc.identifier.urihttp://hdl.handle.net/20.500.12613/3191
dc.description.abstractLysophosphatidylcholines (LPCs) are a class of pro-inflammatory lipids that play important roles in atherogenesis. LPC activates endothelial cells (ECs) to upregulate adhesion molecules, cytokines and chemokines, which is the initiation step of atherogenesis. However, the mechanisms underlying LPC-triggered EC activation are not fully understood. Previously considered as the toxic by-products of cellular metabolism, mitochondrial reactive oxygen species (mtROS) are recently found to directly contribute to both the innate and adaptive immune responses. Here we tested a novel hypothesis that mtROS serve as signaling mediators for LPC-induced EC activation. Using electron spin resonance and flow cytometry with mtROS-specific fluorescence probe MitoSOX, we found that several LPC species including LPC 16:0, 18:0, and 18:1 induced mtROS in human primary aortic ECs (HAECs). Mechanistically, our analysis using confocal microscopy and Seahorse XF96 mitochondrial function analyzer showed that LPC induced mtROS via increasing mitochondrial calcium-mediated increase of mitochondrial respiration. In addition, we found that mtROS scavenger MitoTEMPO abolished LPC-induced EC activation by downregulating Intercellular adhesion molecule 1 (ICAM-1) in HAECs. Moreover, our analysis with mass spectrometer analysis of histone H3 lysine acetylation and electrophoretic mobility shift assay (EMSA) showed that MitoTEMPO acts by blocking LPC-induced histone H3 lysine 14 acetylation (H3K14ac) and nuclear translocation of pro-inflammatory transcription factor activator protein-1 (AP-1). Remarkably, all the above effects can be inhibited by anti-inflammatory cytokines interleukin (IL-35) and IL-10. Our results indicate that mtROS are responsible for LPC-induced EC activation, which can be inhibited by anti-inflammatory cytokines. MtROS targeting therapies and anti-inflammatory cytokines such as IL-35 may serve as novel therapeutic targets for vascular inflammation and cardiovascular diseases. The studies in this dissertation were supported by grants from the National Institutes of Health (NIH) funded to Dr. Xiao-Feng Yang.
dc.format.extent139 pages
dc.language.isoeng
dc.publisherTemple University. Libraries
dc.relation.ispartofTheses and Dissertations
dc.rightsIN COPYRIGHT- This Rights Statement can be used for an Item that is in copyright. Using this statement implies that the organization making this Item available has determined that the Item is in copyright and either is the rights-holder, has obtained permission from the rights-holder(s) to make their Work(s) available, or makes the Item available under an exception or limitation to copyright (including Fair Use) that entitles it to make the Item available.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectPharmacology
dc.subjectImmunology
dc.subjectCellular Biology
dc.subjectAtherosclerosis
dc.subjectEndothelial Cell
dc.subjectInflammation
dc.subjectLysophosphatidylcholine
dc.subjectMitochondria
dc.subjectReactive Oxygen Species
dc.titleMitochondrial Reactive Oxygen Species Mediate Lysophosphatidylcholine-induced Endothelial Cell Activation
dc.typeText
dc.type.genreThesis/Dissertation
dc.contributor.committeememberWang, Hong, 1956 September 19-
dc.contributor.committeememberAshby, Barrie
dc.contributor.committeememberTilley, Douglas G.
dc.contributor.committeememberMuniswamy, Madesh
dc.contributor.committeememberSheu, Shey-Shing
dc.description.departmentPharmacology
dc.relation.doihttp://dx.doi.org/10.34944/dspace/3173
dc.ada.noteFor Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact scholarshare@temple.edu
dc.description.degreePh.D.
refterms.dateFOA2020-11-04T16:10:05Z


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