9 results on '"Kassiteridi, Christina"'
Search Results
2. Interferon regulatory factor-5-dependent CD11c+ macrophages contribute to the formation of rupture-prone atherosclerotic plaques.
- Author
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Edsfeldt A, Swart M, Singh P, Dib L, Sun J, Cole JE, Park I, Al-Sharify D, Persson A, Nitulescu M, Borges PDN, Kassiteridi C, Goddard ME, Lee R, Volkov P, Orho-Melander M, Maegdefessel L, Nilsson J, Udalova I, Goncalves I, and Monaco C
- Subjects
- Animals, Apolipoproteins E genetics, Humans, Inflammation metabolism, Mice, Necrosis, Atherosclerosis metabolism, Atherosclerosis pathology, Interferon Regulatory Factors metabolism, Macrophages immunology, Plaque, Atherosclerotic metabolism, Plaque, Atherosclerotic pathology
- Abstract
Aims: Inflammation is a key factor in atherosclerosis. The transcription factor interferon regulatory factor-5 (IRF5) drives macrophages towards a pro-inflammatory state. We investigated the role of IRF5 in human atherosclerosis and plaque stability., Methods and Results: Bulk RNA sequencing from the Carotid Plaque Imaging Project biobank were used to mine associations between major macrophage associated genes and transcription factors and human symptomatic carotid disease. Immunohistochemistry, proximity extension assays, and Helios cytometry by time of flight (CyTOF) were used for validation. The effect of IRF5 deficiency on carotid plaque phenotype and rupture in ApoE-/- mice was studied in an inducible model of plaque rupture. Interferon regulatory factor-5 and ITGAX/CD11c were identified as the macrophage associated genes with the strongest associations with symptomatic carotid disease. Expression of IRF5 and ITGAX/CD11c correlated with the vulnerability index, pro-inflammatory plaque cytokine levels, necrotic core area, and with each other. Macrophages were the predominant CD11c-expressing immune cells in the plaque by CyTOF and immunohistochemistry. Interferon regulatory factor-5 immunopositive areas were predominantly found within CD11c+ areas with a predilection for the shoulder region, the area of the human plaque most prone to rupture. Accordingly, an inducible plaque rupture model of ApoE-/-Irf5-/- mice had significantly lower frequencies of carotid plaque ruptures, smaller necrotic cores, and less CD11c+ macrophages than their IRF5-competent counterparts., Conclusion: Using complementary evidence from data from human carotid endarterectomies and a murine model of inducible rupture of carotid artery plaque in IRF5-deficient mice, we demonstrate a mechanistic link between the pro-inflammatory transcription factor IRF5, macrophage phenotype, plaque inflammation, and its vulnerability to rupture., (© The Author(s) 2022. Published by Oxford University Press on behalf of European Society of Cardiology.)
- Published
- 2022
- Full Text
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3. CD200 Limits Monopoiesis and Monocyte Recruitment in Atherosclerosis.
- Author
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Kassiteridi C, Cole JE, Griseri T, Falck-Hansen M, Goddard ME, Seneviratne AN, Green PA, Park I, Shami AG, Pattarabanjird T, Upadhye A, Taylor AM, Handa A, Channon KM, Lutgens E, McNamara CA, Williams RO, and Monaco C
- Subjects
- Adult, Aged, Aged, 80 and over, Animals, Antigens, CD genetics, Aorta immunology, Aorta pathology, Aortic Diseases genetics, Aortic Diseases immunology, Aortic Diseases pathology, Atherosclerosis genetics, Atherosclerosis immunology, Atherosclerosis pathology, Cells, Cultured, Coronary Artery Disease diagnostic imaging, Coronary Artery Disease immunology, Coronary Artery Disease metabolism, Disease Models, Animal, Female, Humans, Macrophages immunology, Macrophages metabolism, Male, Mice, Inbred C57BL, Mice, Knockout, ApoE, Middle Aged, Monocytes immunology, Orexin Receptors metabolism, Phosphorylation, Plaque, Atherosclerotic, STAT1 Transcription Factor metabolism, Signal Transduction, Mice, Antigens, CD metabolism, Aorta metabolism, Aortic Diseases metabolism, Atherosclerosis metabolism, Chemotaxis, Leukocyte, Leukopoiesis, Membrane Glycoproteins metabolism, Monocytes metabolism
- Abstract
[Figure: see text].
- Published
- 2021
- Full Text
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4. Immune cell census in murine atherosclerosis: cytometry by time of flight illuminates vascular myeloid cell diversity.
- Author
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Cole JE, Park I, Ahern DJ, Kassiteridi C, Danso Abeam D, Goddard ME, Green P, Maffia P, and Monaco C
- Subjects
- Animals, Aorta metabolism, Aorta pathology, Aortic Diseases genetics, Aortic Diseases metabolism, Aortic Diseases pathology, Atherosclerosis genetics, Atherosclerosis metabolism, Atherosclerosis pathology, Biomarkers metabolism, Diet, High-Fat, Disease Models, Animal, Mice, Knockout, ApoE, Myeloid Cells metabolism, Myeloid Cells pathology, Phenotype, Plaque, Atherosclerotic, Aorta immunology, Aortic Diseases immunology, Atherosclerosis immunology, Cell Separation methods, Flow Cytometry, Immunophenotyping methods, Myeloid Cells immunology, Spectrophotometry, Atomic
- Abstract
Aims: Atherosclerosis is characterized by the abundant infiltration of myeloid cells starting at early stages of disease. Myeloid cells are key players in vascular immunity during atherogenesis. However, the subsets of vascular myeloid cells have eluded resolution due to shared marker expression and atypical heterogeneity in vascular tissues. We applied the high-dimensionality of mass cytometry to the study of myeloid cell subsets in atherosclerosis., Methods and Results: Apolipoprotein E-deficient (ApoE-/-) mice were fed a chow or a high fat (western) diet for 12 weeks. Single-cell aortic preparations were probed with a panel of 35 metal-conjugated antibodies using cytometry by time of flight (CyTOF). Clustering of marker expression on live CD45+ cells from the aortas of ApoE-/- mice identified 13 broad populations of leucocytes. Monocyte, macrophage, type 1 and type 2 conventional dendritic cell (cDC1 and cDC2), plasmacytoid dendritic cell (pDC), neutrophil, eosinophil, B cell, CD4+ and CD8+ T cell, γδ T cell, natural killer (NK) cell, and innate lymphoid cell (ILC) populations accounted for approximately 95% of the live CD45+ aortic cells. Automated clustering algorithms applied to the Lin-CD11blo-hi cells revealed 20 clusters of myeloid cells. Comparison between chow and high fat fed animals revealed increases in monocytes (both Ly6C+ and Ly6C-), pDC, and a CD11c+ macrophage subset with high fat feeding. Concomitantly, the proportions of CD206+ CD169+ subsets of macrophages were significantly reduced as were cDC2., Conclusions: A CyTOF-based comprehensive mapping of the immune cell subsets within atherosclerotic aortas from ApoE-/- mice offers tools for myeloid cell discrimination within the vascular compartment and it reveals that high fat feeding skews the myeloid cell repertoire toward inflammatory monocyte-macrophage populations rather than resident macrophage phenotypes and cDC2 during atherogenesis.
- Published
- 2018
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5. Functional diversity of macrophages in vascular biology and disease.
- Author
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Park I, Kassiteridi C, and Monaco C
- Subjects
- Animals, Anti-Inflammatory Agents therapeutic use, Arteries drug effects, Arteries immunology, Arteries metabolism, Atherosclerosis drug therapy, Atherosclerosis immunology, Atherosclerosis metabolism, Cellular Microenvironment, Humans, Inflammation drug therapy, Inflammation immunology, Inflammation metabolism, Inflammation Mediators metabolism, Macrophages drug effects, Macrophages immunology, Macrophages metabolism, Phenotype, Transcription Factors metabolism, Arteries pathology, Atherosclerosis pathology, Inflammation pathology, Macrophages pathology
- Abstract
Atherosclerosis is a multifactorial chronic inflammatory disease and is largely responsible for cardiovascular disease, the most common cause of global mortality. The hallmark of atherogenesis is immune activation following lipid accumulation in the arterial wall. In particular, macrophages play a non-redundant role in both the progression and regression of inflammation in the atherosclerotic lesion. Macrophages are remarkably heterogeneous phagocytes that perform versatile functions in health and disease. Their functional diversity in vascular biology is only partially mapped. Targeting macrophages is often highlighted as a therapeutic approach for cancer, metabolic and inflammatory diseases. Future strategies for therapeutic intervention in atherosclerosis may benefit from attempts to reduce local proliferation of pro-inflammatory macrophage subsets or enhance resolution of inflammation. Thus, characterisation of macrophage subsets during atherosclerosis would empower clinical interventions. Therefore, it would be of fundamental importance to understand how pathological factors modulate macrophage activity in order to exploit their use in the treatment of atherosclerosis and other diseases., (Copyright © 2017 Elsevier Inc. All rights reserved.)
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- 2017
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6. Interferon Regulatory Factor 5 Controls Necrotic Core Formation in Atherosclerotic Lesions by Impairing Efferocytosis.
- Author
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Seneviratne AN, Edsfeldt A, Cole JE, Kassiteridi C, Swart M, Park I, Green P, Khoyratty T, Saliba D, Goddard ME, Sansom SN, Goncalves I, Krams R, Udalova IA, and Monaco C
- Subjects
- Animals, Aorta metabolism, Aorta pathology, Apolipoproteins E deficiency, Apolipoproteins E genetics, Atherosclerosis metabolism, Bone Marrow Cells cytology, Bone Marrow Cells metabolism, CD11c Antigen genetics, CD11c Antigen metabolism, Cells, Cultured, Immunohistochemistry, Integrin beta3 metabolism, Interferon Regulatory Factors deficiency, Interferon Regulatory Factors genetics, Lymph Nodes cytology, Macrophages cytology, Macrophages metabolism, Mice, Mice, Inbred C57BL, Mice, Knockout, Necrosis, Phagocytosis, Shear Strength, Atherosclerosis pathology, Interferon Regulatory Factors metabolism
- Abstract
Background: Myeloid cells are central to atherosclerotic lesion development and vulnerable plaque formation. Impaired ability of arterial phagocytes to uptake apoptotic cells (efferocytosis) promotes lesion growth and establishment of a necrotic core. The transcription factor interferon regulatory factor (IRF)-5 is an important modulator of myeloid function and programming. We sought to investigate whether IRF5 affects the formation and phenotype of atherosclerotic lesions., Methods: We investigated the role of IRF5 in atherosclerosis in 2 complementary models. First, atherosclerotic lesion development in hyperlipidemic apolipoprotein E-deficient (ApoE
-/- ) mice and ApoE-/- mice with a genetic deletion of IRF5 (ApoE-/- Irf5-/- ) was compared and then lesion development was assessed in a model of shear stress-modulated vulnerable plaque formation., Results: Both lesion and necrotic core size were significantly reduced in ApoE-/- Irf5-/- mice compared with IRF5-competent ApoE-/- mice. Necrotic core size was also reduced in the model of shear stress-modulated vulnerable plaque formation. A significant loss of CD11c+ macrophages was evident in ApoE-/- Irf5-/- mice in the aorta, draining lymph nodes, and bone marrow cell cultures, indicating that IRF5 maintains CD11c+ macrophages in atherosclerosis. Moreover, we revealed that the CD11c gene is a direct target of IRF5 in macrophages. In the absence of IRF5, CD11c- macrophages displayed a significant increase in expression of the efferocytosis-regulating integrin-β3 and its ligand milk fat globule-epidermal growth factor 8 protein and enhanced efferocytosis in vitro and in situ., Conclusions: IRF5 is detrimental in atherosclerosis by promoting the maintenance of proinflammatory CD11c+ macrophages within lesions and controlling the expansion of the necrotic core by impairing efferocytosis., (© 2017 The Authors.)- Published
- 2017
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7. Macrophages and dendritic cells: the usual suspects in atherogenesis.
- Author
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Kassiteridi C and Monaco C
- Subjects
- Animals, Anti-Inflammatory Agents therapeutic use, Arteries drug effects, Arteries immunology, Arteries metabolism, Arteries pathology, Atherosclerosis drug therapy, Atherosclerosis metabolism, Atherosclerosis pathology, Dendritic Cells drug effects, Dendritic Cells metabolism, Dendritic Cells pathology, Humans, Inflammation drug therapy, Inflammation metabolism, Inflammation pathology, Inflammation Mediators immunology, Inflammation Mediators metabolism, Macrophages drug effects, Macrophages metabolism, Macrophages pathology, Phenotype, Signal Transduction, Atherosclerosis immunology, Dendritic Cells immunology, Inflammation immunology, Macrophages immunology
- Abstract
Atherosclerosis, the major risk factor for cardiovascular disease (CVD) and the leading cause of death worldwide, is a multifactorial chronic inflammatory disease, which, clinically manifests from early lipid-rich lesions to plaque rupture and/or thrombosis in the arterial wall. The myeloid cell compartment, including macrophages and dendritic cells (DCs), is long known to contribute to the initiation and progression of atherosclerosis. However their complex phenotypic heterogeneity hampers our full understanding of their role. Here, we review the biological and functional versatility of the myeloid cells in atherosclerosis. Several distinct subsets of macrophages and myeloid cells have been identified in atherosclerotic plaques, including subsets that are specific to atherosclerosis itself. Our ability to target them therapeutically is still limited. The challenge for the future will be the definition of treatments that target specific myeloid subsets to prevent the activation of pro-atherogenic myeloid cell subsets while preserving the anti-atherogenic and repairable function of myeloid cells.
- Published
- 2015
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8. Toll-like receptors in atherosclerosis: a 'Pandora's box' of advances and controversies.
- Author
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Cole JE, Kassiteridi C, and Monaco C
- Subjects
- Animals, Humans, Immunity, Innate immunology, Atherosclerosis immunology, Toll-Like Receptors immunology
- Abstract
Seminal research over the past 20 years has revealed atherosclerosis to be a chronic inflammatory process that shares features with traditional inflammatory diseases including rheumatoid arthritis. More recently, emphasis has been placed on the role of innate immunity in the development and progression of atherosclerosis. In particular, pattern recognition receptors, including Toll-like receptors (TLRs), have been the focus of much attention as modulators of atherogenesis. This review provides an update on the developments in this area of research in the past 2 years, with a specific focus on the current controversies and how these may affect the design of therapeutics. Specifically, we will address the recent evidence that TLRs elicit both protective and detrimental effects in atherosclerosis and the emerging observation that the outcome of TLR signaling is dependent on the agonist and responding cell type., (Copyright © 2013 Elsevier Ltd. All rights reserved.)
- Published
- 2013
- Full Text
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9. Toll-like receptors in atherosclerosis.
- Author
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Falck-Hansen M, Kassiteridi C, and Monaco C
- Subjects
- Animals, Apolipoproteins E genetics, Apolipoproteins E metabolism, Atherosclerosis pathology, Humans, Myeloid Differentiation Factor 88 metabolism, Risk Factors, Signal Transduction, Atherosclerosis metabolism, Toll-Like Receptors metabolism
- Abstract
Atherosclerosis, the leading cause of cardiovascular disease (CVD), is driven by inflammation. Increasing evidence suggests that toll-like receptors (TLRs) are key orchestrators of the atherosclerotic disease process. Interestingly, a distinct picture is being revealed for individual receptors in atherosclerosis. TLRs exhibit a complex nature enabling the detection of multiple motifs named danger-associated molecular patterns (DAMPs) and pathogen-associated molecular patterns (PAMPs). Activation of these receptors triggers an intracellular signalling cascade mediated through MyD88 or TRIF, leading to the production of pro- and anti-inflammatory cytokines. In this review we explore key novel findings pertaining to TLR signalling in atherosclerosis, including recently described endosomal TLRs and future directions in TLR research.
- Published
- 2013
- Full Text
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